View Filing Data

4,433

3,573

3,872

Non-cash interest expense

^[1]

(759)

(7,766)

8,595

7,552

3,252

Provision for doubtful accounts

6,970

2,016

2,895

Provision for inventory obsolescence

2,335

3,085

300

Impairment of securities available for sale

574

1,164

(Gain) loss on sale of assets

(1,208)

(76)

(907)

Estimated losses on disposal of businesses, including impairment charges

12,922

Gain on remeasurement of equity interest in acquiree

(29,041)

Changes in assets and liabilities, net of assets acquired and liabilities assumed:

Accounts receivable

(177,313)

(180,839)

(127,724)

Inventories

15,448

(30,527)

(25,363)

Deferred tax assets and liabilities, net

3,775

22,696

56,360

Other assets, current and non-current portion

(6,383)

(23,453)

(5,293)

Accounts payable and accrued expenses

76,285

73,099

67,137

Billings in excess of costs and earnings

15,651

(34,712)

86,201

Other liabilities, current and non-current portion

21,016

7,936

7,348

Net cash provided by (used in) operating activities

172,135

5,826

218,029

Cash flows provided by (used in) investing activities:

Cash paid for acquisitions, net, including contingent consideration

(153,138)

(85,395)

(75,896)

Payments to acquire equity method investees

10,854

Capital expenditures

(79,686)

(71,710)

(30,383)

Proceeds from sale of assets

7,385

6,227

7,037

Proceeds from disposal of business, net

97,728

Payments to acquire other investments

750

Proceeds from sale or redemption of investments

4,600

7,044

Investments in life insurance policies

(284)

(478)

Net cash provided by (used in) investing activities

(127,995)

(146,562)

(104,280)

Cash flows (used in) provided by financing activities:

Proceeds from credit facility

959,183

370,411

Repayments of credit facility

(885,183)

(310,411)

Proceeds from other borrowings

13,543

Repayments of other borrowings

(21,455)

(13,956)

(27,170)

Proceeds from book overdrafts

116

14,906

Payments of capital lease obligations

(21,060)

(16,458)

(14,460)

Proceeds from stock option exercises and other share-based awards

5,013

12,542

3,515

Purchases of treasury stock

759

7,766

(75,000)

Payments of financing costs

(117)

(6,589)

(169)

Net cash (used in) provided by financing activities

(37,744)

(16,789)

(24,741)

Net (decrease) increase and cash equivalents

6,396

(157,525)

89,008

Net effect of currency translation on cash

201

Cash and cash equivalents - beginning of period

20,280

177,604

88,521

Cash and cash equivalents - end of period

26,767

20,280

177,604

Cash and cash equivalents of discontinued operations

385

12,874

18,911

Cash and cash equivalents of continuing operations

26,382

7,406

158,693

Supplemental cash flow information:

Interest paid

27,074

27,607

27,385

Income taxes paid, net of refunds

58,968

27,803

5,694

Supplemental disclosure of noncash information:

Equipment acquired under capital lease

60,648

7,412

2,243

Machinery and Equipment [Member]

Supplemental disclosure of noncash information:

Equipment acquired under financing arrangements

6,009

25,788

Conversion of leases from operating to capital

23,366

Equity Issued in Business Combination [Member]

Supplemental disclosure of noncash information:

Shares issued in connection with business combinations

94,213

27,045

Contracts Accounted for under Percentage of Completion [Member]

Adjustments to reconcile net income to net cash provided by operating activities:

Provision for losses on construction projects, net

(9,649)

10,509

434

Inventories [Member]

Supplemental cash flow information:

Receipt of inventory prepaid in prior year

12,005

Total Exchanged Senior Convertible Notes [Member] | Convertible Debt [Member]

Supplemental disclosure of noncash information:

Exchange of senior convertible notes

$ 0

$ 202,322

$ 0

[1]	Excess tax benefits, which represent cash flows from tax deductions in excess of compensation expense recognized for stock options exercised and vested restricted shares, are classified as financing cash flows in the Company’s consolidated statements of cash flows.

Business, Basis of Presentation and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2012
Policy Text Block [Abstract]
Business, Basis of Presentation and Significant Accounting Policies	Business, Basis of Presentation and Significant Accounting Policies Nature of the Business MasTec, Inc. (collectively with its subsidiaries, “MasTec” or the “Company”) is a leading infrastructure construction company operating mainly throughout North America across a range of industries. The Company’s primary activities include the engineering, building, installation, maintenance and upgrade of energy, utility and communications infrastructure, such as: electrical utility transmission and distribution; power generation; natural gas and petroleum pipeline infrastructure; wireless, wireline and satellite communications; wind farms, solar farms and other renewable energy infrastructure; and industrial infrastructure. MasTec’s customers are primarily in these industries. Principles of Consolidation The accompanying consolidated financial statements include MasTec, Inc. and its subsidiaries and include the accounts of all majority-owned subsidiaries over which the Company exercises control and, when applicable, entities in which the Company has a controlling financial interest. Other parties’ interests in companies for which MasTec exercises control and has a controlling financial interest are reported as non-controlling interests within shareholders’ equity. Net income or loss attributable to non-controlling interests is reported as a separate line item below net income. The Company’s investments in entities in which the Company does not have a controlling interest, but has the ability to exert significant influence, are accounted for using the equity method of accounting. Equity method investments are recorded as long-term assets in the consolidated balance sheets. Income or loss from these investments is recorded in other income or expense, net, in the consolidated statements of operations. The cost method is used for investments in entities in which the Company does not have the ability to exert significant influence. All significant intercompany balances and transactions have been eliminated in consolidation. Management Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Key estimates include: the recognition of revenue, in particular, on long-term construction contracts, including estimates to complete and provisions for contract losses; allowances for doubtful accounts; accrued self-insured claims; estimated fair values of goodwill and intangible assets, acquisition-related contingent consideration, assets and liabilities classified as held-for-sale, investments in equity method investees, securities available for sale and certain convertible debt obligations; asset lives used in computing depreciation and amortization, including amortization of intangible assets; accounting for income taxes; and the estimated impact of contingencies and ongoing litigation. While management believes that such estimates are fair when considered in conjunction with the consolidated financial position and results of operations taken as a whole, actual results could differ from those estimates and such differences may be material to the consolidated financial statements. Significant Accounting Policies The following is a summary of significant accounting policies followed in the preparation of the accompanying consolidated financial statements. Discontinued Operations In determining whether a group of assets to be disposed of should be presented as a discontinued operation, the Company makes a determination as to whether such assets comprise a component of the entity, which includes an assessment as to whether it has historic operations and cash flows that can be clearly distinguished. The Company also determines whether the cash flows associated with the group of assets will be significantly eliminated from the ongoing operations of the Company as a result of the disposal transaction and whether the Company will have no significant continuing involvement in the operations of the disposed assets after the disposal transaction. If management believes these conditions exist, then the assets and liabilities and results of operations of the assets to be disposed, as well as any estimated gain or loss on the disposal transaction, are aggregated for presentation separately from the financial position and operating results of the Company's continuing operations. For those businesses for which management has committed to a plan of sale, the business is valued at the lower of its carrying amount or estimated fair value less costs to sell. If the carrying amount of the business exceeds its estimated fair value, an impairment loss is recognized. Estimated fair value is determined using management estimates and entity-specific assumptions. Management considers historical experience and all available information at the time such estimates are made; however, the fair value that is ultimately recognized upon sale of the related business may differ from the estimated fair value as reflected in the consolidated financial statements. Depreciation and amortization expense is not recorded on assets of a business to be sold once that business has been classified as held for sale. In May 2012, Red Ventures LLC (“Red Ventures”) exercised its purchase option to acquire MasTec’s wholly owned subsidiary, DirectStar TV, LLC (“DirectStar”), including its subsidiaries (together, the “DirectStar Business”). The transaction was consummated in June 2012. In September 2012, MasTec's board of directors approved a plan of sale for its wholly-owned subsidiary, Globetec Construction LLC and subsidiaries (“Globetec”), to be completed on or before September 30, 2013. In connection with its decision to sell Globetec, the Company recognized impairment losses of $12.7 million during the third quarter of 2012. The DirectStar Business and Globetec are presented as discontinued operations in the consolidated financial statements for all periods presented. See Note 4 - Discontinued Operations. Translation of Foreign Currencies The assets and liabilities of foreign subsidiaries are translated into U.S. dollars at period-end exchange rates, with resulting translation gains or losses accumulated within other comprehensive income. Revenue and expenses are translated into U.S. dollars at average rates of exchange prevailing during the period. Gains or losses resulting from transactions executed in a foreign currency are included in other income or expense, net. The Company does not currently have any subsidiaries that operate in highly inflationary environments. Reclassifications Certain prior year amounts have been reclassified to conform to the current period presentation. Comprehensive Income Comprehensive income is a measure of net income and all other changes in equity that result from transactions other than those with shareholders. Comprehensive income consists of net income, foreign currency translation adjustments, unrealized gains and losses from securities available for sale, and losses from non-controlling interests. See consolidated statements of comprehensive income for details. Accumulated other comprehensive losses of $5.5 million and $7.9 million as of December 31, 2012 and 2011, respectively, are primarily attributable to unrealized losses on securities available for sale, net of tax, and foreign currency translation losses and/or gains. Revenue Recognition Revenues are derived from projects performed under master and other service agreements, as well as from fixed price contracts for specific projects or jobs requiring the construction and installation of an entire infrastructure system or specified units within an entire infrastructure system. The Company frequently provides maintenance, installation and repair work under unit price or fixed price master service or other service agreements that are renewed on a periodic basis. Revenue and related costs for master and other service agreements billed on a time and materials basis are recognized as the services are rendered. Services are also performed under master and other service agreements billed on a fixed fee basis. Under fixed fee master service and similar type service agreements, MasTec furnishes various specified units of service for a separate fixed price per unit of service. Revenues from fixed price contracts are recognized using the percentage-of-completion method, measured by the percentage of costs incurred to date to total estimated costs for each contract. These contracts provide for a fixed amount of revenues for the entire project. Contract costs include all direct materials, labor and subcontracted costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and the operational costs of capital equipment (excluding depreciation). Much of the materials associated with the Company’s work are customer-furnished and are therefore not included in contract revenues and costs. The cost estimation process is based on the professional knowledge and experience of the Company’s engineers, project managers and financial professionals. Changes in job performance, job conditions and final contract settlements are factors that influence management’s assessment of total contract value and the total estimated costs to complete those contracts and therefore, the Company’s profit recognition. Changes in these factors may result in revisions to costs and income, and their effects are recognized in the period in which the revisions are determined. Provisions for losses on uncompleted contracts are made in the period in which such losses are determined to be probable and the amount can be reasonably estimated. A substantial majority of the Company's fixed price projects are completed within one year. The Company may incur costs subject to change orders, whether approved or unapproved by the customer, and/or claims related to certain contracts. Management determines the probability that such costs will be recovered based upon evidence such as engineering studies and legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer. The Company treats project costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defers costs and/or recognizes revenue up to the amount of the related cost if it is probable that the contract price will be adjusted and can be reliably estimated. Billings in excess of costs and estimated earnings on uncompleted contracts are classified as current liabilities. Costs and estimated earnings in excess of billings, or work in process, is classified within current assets for the majority of the Company’s projects. Work in process on contracts is based on work performed but not yet billed to customers as per individual contract terms. Allowance for Doubtful Accounts The Company maintains an allowance for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments. Management analyzes the collectibility of accounts receivable and the adequacy of the allowance for doubtful accounts on a regular basis, based on the aging of account balances, historical bad debt experience, customer concentrations, customer credit-worthiness, customer financial condition and credit reports, availability of mechanics’ and other liens, existence of payment bonds and other sources of payment and current economic trends. For reporting units where losses have occurred historically and are considered to be ordinary course, reserves are established for anticipated losses based on an analysis of the accounts receivable portfolio. For reporting units where historical losses have been immaterial, an increase in the allowance for doubtful accounts is recorded when it is probable a receivable is not collectible and the loss can be reasonably estimated. Amounts are written off against the allowance when deemed uncollectible. Cash and Cash Equivalents All short-term highly liquid investments with original maturities of three months or less are considered to be cash equivalents and are stated at cost, which approximates market value. Cash Overdrafts. On a daily basis, available funds are swept from the Company’s depository accounts into a concentration account and are used to repay debt under the Company’s Credit Facility. Cash overdrafts principally represent the balance of outstanding checks that have not yet cleared through the banking system. Other cash balances maintained by certain operating subsidiaries, which are not swept into the concentration account, as well as deposits made subsequent to the daily cash sweep, are classified as cash. The Company generally does not fund its disbursement accounts for checks it has written until the checks are presented to the bank for payment. Cash overdrafts are classified within accounts payable. There are no compensating balance requirements associated with the Company’s depository accounts and there are no other restrictions on the transfer of cash associated with the Company’s depository accounts. As of December 31, 2012 and 2011, cash overdrafts totaled $15.0 million and $14.9 million, respectively. Fair Value of Financial Instruments The Company’s financial instruments include cash and cash equivalents, accounts and notes receivable, cash collateral deposited with insurance carriers, cash surrender value of life insurance policies, auction rate securities, cost and equity method investments, deferred compensation plan assets and liabilities, accounts payable and other current liabilities, acquisition-related contingent consideration and debt obligations. Fair value is the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value guidance establishes a valuation hierarchy, which requires maximizing the use of observable inputs when measuring fair value. The three levels of inputs that may be used are: Level 1 - Quoted market prices in active markets for identical assets or liabilities. Level 2 - Observable market based inputs or other observable inputs. Level 3 - Significant unobservable inputs that cannot be corroborated by observable market data. These values are generally determined using valuation models incorporating management’s estimates of market participant assumptions. Fair values of financial instruments are estimated through the use of public market prices, quotes from financial institutions and other available information. Due to their short-term maturity, the carrying amounts of cash and cash equivalents, accounts and notes receivable and accounts payable and other current liabilities approximate their fair values. Management believes the carrying values of cash collateral deposited with insurance carriers, deferred compensation plan assets and liabilities and outstanding balances on the Company’s credit facility approximate their fair values. Cost and equity method investments are initially recorded at their cost basis. The fair value of the Company’s cost and equity method investments are not readily available, however, disclosure of their fair value is not required. Management is not aware of events or changes in circumstances that would have a material adverse effect on the carrying value of the Company’s cost or equity method investments. See Note 6 – Fair Value of Financial Instruments for estimated fair values and carrying amounts of the Company’s other financial instruments. Securities Available for Sale The Company’s securities available for sale consist of auction-rate securities, which represent interests in pools of student loans guaranteed by the U.S. government under the Federal Family Education Loan Program and a structured finance security. The structured finance security has an attached credit default swap under which the principal value of the structured finance security would be partially or fully forfeited at net default rates on the underlying corporate debt obligations ranging from 8% to 9% . The net default rate as of December 31, 2012 was estimated to be 6.22%. Both the structured finance security and the credit default swap are collateralized by investment grade credit-linked notes made up of floating rate international bank notes. Liquidity for auction rate securities was originally provided by an auction process that would provide for liquidation or reset the applicable interest rate at pre-determined intervals, usually every 7, 28 or 35 days. Due to disruptions in the credit markets beginning in 2008, these auctions have not had sufficient bidders to allow investors to complete a sale, indicating that liquidity at its par value is unavailable. Due to the failed auction process, there was insufficient observable market data to determine the fair value of the Company’s auction rate securities as of either December 31, 2012 or 2011. Therefore, their respective fair values were estimated by an independent valuation firm, Houlihan Capital Advisors, LLC ("Houlihan"), using a probability-weighted discounted cash flow model. The model incorporates assumptions that market participants would use in their estimates of fair value, such as reset interest rates, final stated maturities, collateral values, credit quality and insurance, and applies the probabilities of either (a) a successful auction; (b) a failed auction; or (c) a default; at each auction. The valuation of these securities is sensitive to market conditions and managements' judgment and can change significantly based on the assumptions used. Factors that may impact the valuation include: changes to credit ratings of the securities and, for the structured finance security, changes to the credit ratings of the underlying assets supporting the security as well as rates of default of the underlying assets, underlying collateral values, discount rates, counterparty risk and ongoing strength and quality of market credit and liquidity. As a result, these securities have been recorded as long-term assets at their estimated fair values in the consolidated financial statements. Fair values are reevaluated quarterly. Temporary unrealized holding gains and losses are recorded as a separate component of accumulated other comprehensive income (loss), net of applicable income taxes. Unrealized losses are charged against earnings when a decline in fair value is determined to be other-than-temporary. An impairment is considered to be other-than-temporary if an entity: (i) intends to sell a security, (ii) more likely than not will be required to sell a security before recovering its cost, or (iii) does not expect to recover a security’s entire amortized cost basis, even if there is no intent to sell the security. The Company considers several factors in assessing whether a loss is other-than-temporary. These factors include, but are not limited to: intent to hold a security; that it is not more likely than not that the Company will be required to sell a security before recovery of its cost basis; the length of time a security is in an unrealized loss position; the extent to which fair value is less than cost; the financial condition and near term prospects of the issuer; changes to the credit ratings of securities, as well as their underlying assets; and, for the Company’s structured finance security, rates of default on the loan portfolio underlying the credit default swaps. In assessing the expectation of recovering a security’s amortized cost basis, management performs an assessment of the present value of cash flows expected to be collected. If this assessment yields an amount less than the amortized cost basis of the security, even if the Company has the intent, and more likely than not, the ability to hold the securities, a credit loss is deemed to exist. The amount of an other-than-temporary impairment attributed to the credit losses is recognized in earnings, while the amount of an other-than-temporary impairment related to other factors is recognized in other comprehensive income, net of applicable deferred income taxes. The Company estimates credit losses associated with its auction rate securities using Level 3 inputs. Credit loss estimates are derived by comparing the estimated fair value of the securities, which are based on a number of factors, including estimated probabilities of default, with the value that would have been derived if the probability of default for the same securities were zero percent. The difference between the recorded fair value and the estimated fair value assuming a zero probability of default is considered the portion of total decline in fair value attributable to credit losses. See Note 7 – Securities Available for Sale. Inventories Inventories consist of materials and supplies for construction and install to the home projects. Inventories are valued at the lower of cost (using the specific identification method) or market. Construction projects are completed pursuant to customer specifications. For materials or supplies purchased on behalf of specific customers or projects, loss of the customer or cancellation of the project could result in an impairment of the value of materials purchased. Technological or market changes can also render certain materials obsolete. Allowances for inventory obsolescence are determined based upon the specific facts and circumstances and market conditions. As of December 31, 2012 and 2011, inventory obsolescence reserves were $2.0 million and $2.2 million, respectively. Deferred Financing Costs Deferred financing costs related to the Company’s credit facility, senior notes and senior convertible notes, whose short and long-term portions are included in other current and non-current assets in the consolidated balance sheets, are amortized over the related terms of the debt using the effective interest method. Net deferred financing costs were $9.9 million and $13.5 million at December 31, 2012 and 2011, respectively. Software Capitalization The Company capitalizes certain costs incurred in connection with developing or obtaining internal use software. These capitalized software costs are included in property and equipment, net, in the consolidated balance sheets and are amortized over a period not to exceed seven years . Business Combinations – Valuation of Acquired Assets and Liabilities Assumed The Company allocates the purchase price for each business combination, or acquired business, based upon (i) the fair value of the consideration paid and (ii) the fair value of net assets acquired. The determination of the fair value of net assets acquired requires estimates and judgments of future cash flow expectations for the acquired business and the allocation of those cash flows to identifiable tangible and intangible assets. Fair values are calculated by incorporating expected cash flows into industry standard valuation techniques. For current assets and current liabilities, the book value is generally assumed to equal the fair value. Goodwill is the amount by which the purchase price consideration exceeds the fair value of tangible and intangible assets, less assumed liabilities. To the extent possible, goodwill should be allocated to separate identifiable intangible assets, such as customer relationships and trade names, which are amortized to expense over their estimated useful lives. Goodwill and indefinite-lived intangible assets are not amortized, but are tested for impairment annually and, if impaired, their value is reduced to fair value. Acquisition costs are expensed as incurred. Consideration paid generally consists of cash, common stock, and additional cash or common stock payments which are contingent on the acquired business achieving certain levels of earnings (referred to as “contingent consideration” or “earnouts”). The fair value of cash and MasTec common stock is generally based upon the amount tendered or the market price on the closing date, respectively. A liability for contingent consideration based on earnings is measured at its estimated fair value as of the date of acquisition, with subsequent changes in fair value recorded in earnings as a gain or loss. Fair value is estimated as of the acquisition closing date utilizing calculated earnout payments that would be made as if managements' best estimate of possible cash flows of the acquired business was accurate. Thus, if actual earnout payments are expected to exceed estimated earnout payments (as a result of higher than expected acquired business cash flows), then a loss would be recognized in the period in which that expectation is considered probable. Conversely, if actual earnout payments are expected to fall below estimated earnout payments, a gain would be recognized in the period that expectation is considered probable. Due to the time required to gather and analyze the necessary data for each acquisition, U.S. GAAP provides a “measurement period” of up to one year in which to finalize such calculations. Most calculations are considered preliminary until the end of the measurement period. All subsequent adjustments to initial valuations and estimates during the measurement period that reflect newly discovered information that existed as of the acquisition date are recorded with an offsetting entry to goodwill; otherwise, those adjustments are reflected as income or expense, as appropriate. The consolidated balance sheet for the period of acquisition is modified for subsequent measurement period adjustments when that period is presented in future consolidated financial statements. Long-Lived Assets The Company’s long-lived assets consist primarily of property and equipment and finite-lived intangible assets. Property and equipment are recorded at cost, or if acquired in a business combination, at acquisition date fair value. Depreciation is computed using the straight-line method over the estimated useful lives of the respective assets. Leasehold improvements are depreciated over the shorter of the term of the lease or the estimated useful lives of the improvements. Property and equipment under capital leases are depreciated over their estimated useful lives. Expenditures for repairs and maintenance are charged to expense as incurred. Expenditures for betterments and major improvements are capitalized and depreciated over the remaining useful lives of the assets. The carrying amounts of assets sold or retired and related accumulated depreciation are eliminated in the year of disposal and the resulting gains and losses are included in other income or expense. Acquired intangible assets that have finite useful lives are recognized and amortized over their useful lives, which are generally based on contractual or legal rights. Management reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be realizable. If an evaluation is required, the estimated future undiscounted cash flows associated with the asset are compared to the asset’s carrying amount to determine if there has been an impairment. The amount of an impairment is calculated as the difference between the fair value of the asset and its carrying value. Estimates of future undiscounted cash flows are based on management’s view of growth rates for the related business, anticipated future economic conditions and estimates of residual values. Estimated fair values take into consideration appropriate discount rates relative to risk. Management believes that these estimates are consistent with assumptions that marketplace participants would use in their estimates of fair value. For the three years in the period ended December 31, 2012, no material impairment charges were incurred relating to the Company’s long-lived assets. Goodwill and Indefinite-Lived Intangible Assets Goodwill and certain intangible assets acquired in a business combination and determined to have indefinite useful lives are not amortized, but instead are tested for impairment at least annually. The Company performs its annual impairment review of goodwill and intangible assets with indefinite lives during the fourth quarter each year at the reporting unit level. Each of the Company's reporting units comprises one component of one of its five reportable segments. Management identifies its reporting units by assessing whether components have discrete financial information available and whether a segment manager regularly reviews the operating results of that component. Net assets of acquired businesses and related goodwill are allocated to the corresponding reporting unit upon acquisition, based upon the Company's expected organizational structure. If two or more components are deemed economically similar, those components are aggregated into one reporting unit for purposes of the annual goodwill impairment review. None of the Company's components are aggregated for annual impairment testing. Under Accounting Standards Update (“ASU”) 2011-08, Intangibles – Goodwill and Other (Topic 350): Testing Goodwill for Impairment ("ASU 2011-08"), which the Company adopted for the year ended December 31, 2011, and ASU 2012-02 Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment (“ASU 2012-02”), which the Company adopted for the year ended December 31, 2012, a full quantitative analysis is not required if the Company's qualitative analysis concludes that it is more likely than not that the fair value of the Company's reporting units or indefinite-lived intangible assets are greater than their carrying amounts. During the years ended December 31, 2012 and 2011, the Company assessed qualitative factors to determine whether it was more likely than not that the fair values of the Company’s reporting units were less than their carrying amounts as a basis for determining whether it was necessary to perform the traditional two-step quantitative goodwill impairment test. During the year ended December 31, 2010, management estimated the fair values of the Company’s reporting units to determine if their carrying values exceeded their estimated fair values using a discounted cash flow methodology, which incorporated management estimates, including estimates of future cash flows and growth rates, as well as the selection of a discount rate. Based upon the results of these analyses, the estimated fair values of the Company's reporting units for its continuing operations businesses were determined to substantially exceed their carrying values. In September 2012, MasTec's board of directors approved a plan of sale for its Globetec business. In connection with its decision to sell Globetec, the Company recognized impairment losses of $12.7 million, including $6.4 million of goodwill impairment charges, during the third quarter of 2012. During the year ended December 31, 2012, the Company also assessed qualitative factors to determine if it was more likely than not that the fair values of its indefinite-lived intangible assets were less than their carrying amounts. For the years ended December 31, 2011 and 2010, management estimated the fair values of its indefinite-lived intangible assets based on estimates of growth rates for the related businesses and estimated future economic conditions. Based upon the results of its analysis, no impairment charges related to the Company's indefinite-lived intangible assets for its continuing operations businesses were recorded during the three years in the period ended December 31, 2012. See Note 4 - Discontinued Operations for details of the Globetec discontinued operation and Note 5 – Goodwill and Other Intangible Assets. Self-Insurance MasTec maintains insurance policies subject to per claim deductibles of $1 million for its workers’ compensation policy, $2 million for its general liability policy and $2 million for its automobile liability policy. The Company has excess umbrella coverage up to $100 million per claim and in the aggregate. Liabilities under these insurance programs are accrued based upon management’s estimates of the ultimate liability for claims reported and an estimate of claims incurred but not reported with assistance from third-party actuaries. MasTec also maintains an insurance policy with respect to employee group health claims, which is subject to annual per employee maximum losses of $0.4 million. MasTec’s liability for employee group claims is based on statistical analysis of historical claims experience and specific knowledge of actual losses that have occurred. The present value of the Company’s self-insurance liabilities are reflected in the consolidated balance sheets as current and other non-current liabilities. The determination of such claims and expenses and the appropriateness of the related liability is reviewed and updated quarterly, however, these insurance liabilities are difficult to assess and estimate due to unknown factors, including the severity of an injury, the determination of the Company’s liability in proportion to other parties and the number of incidents not reported. Accruals are based upon known facts and historical trends and management believes such accruals to be adequate. However, a change in experience or actuarial assumptions could materially affect results of operations in a particular period. The Company is required to post letters of credit and provide cash collateral to certain of its insurance carriers and to obtain surety bonds in certain states in which the Company is self-insured. In addition, the Company has certain cash collateral deposited with insurance carriers, which is included in other long-term assets in the consolidated balance sheets. Income Taxes The Company records income taxes using the asset and liability method of accounting for deferred income taxes. Under this method, deferred tax assets and liabilities are recognized for the expected future tax consequence of temporary differences between the financial statement and income tax basis of the Company’s assets and liabilities. Income taxes are estimated in each of the jurisdictions in which the Company operates. This process involves estimating the tax exposure together with assessing temporary differences resulting from differing treatment of items, such as deferred revenue, for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included within the consolidated balance sheets. The recording of a deferred tax asset assumes the realization of such asset in the future. Otherwise, a valuation allowance must be recorded to reduce this asset to its estimated net realizable value. Management considers future pretax income and ongoing prudent and feasible tax planning strategies in assessing the estimated net realizable value of tax assets and the need for a valuation allowance. If management determines that the Company may not be able to realize all or part of a deferred tax asset in the future, a valuation allowance for the deferred tax asset is charged to income tax expense in the period such determination is made. In determining the provision for income taxes, management uses an effective tax rate based on annual pre-tax income, statutory tax rates, permanent tax differences, and tax planning opportunities in the various jurisdictions in which the Company operates. Significant factors that impact the annual effective tax rate include management’s assessment of certain tax matters, the location and amount of taxable earnings, changes in certain non-deductible expenses and expected credits. The Company and its subsidiaries file income tax returns in numerous tax jurisdictions, including U.S. federal, most U.S. states and certain foreign jurisdictions. The Company’s U.S. federal income tax returns for years ending on or after December 31, 2009, and many U.S. state and local income tax returns, remain open for examination. Although management believes its calculations for tax returns are correct and the positions taken thereon are reasonable, the final outcome of tax audits could be materially different from the resolution management currently anticipates, and those differences could result in significant costs or benefits to the Company. If applicable, any interest or penalties pertaining to the Company’s income tax returns, if assessed, would be recorded within interest expense or general and administrative expense, respectively, in the consolidated statements of operations. Stock-Based Compensation The Company has granted to employees and others restricted stock and options to purchase common stock. Non-cash stock compensation expense for administrative employees is included in general and administrative expense. Share-based payments, to the extent they are compensatory, are recognized based on their grant date fair values and the estimated number of shares ultimately expected to vest. The Company records a deferred tax asset, or future tax benefit, based on the amount of share-based compensation recognized in the financial statements over the vesting period of share-based awards. If the exercise date fair value of a stock option, or the vesting date fair value of a restricted share award exceeds its grant date fair value, the tax effect of this difference (“excess tax benefit”) is recorded as an increase to additional paid-in capital (“APIC”), creating an “APIC Pool.” If the exercise date fair value of a stock option, or the vesting date fair value of a restricted share award is less than its grant date fair value, the tax effect of this difference would reduce the APIC Pool. If the APIC Pool is reduced to zero, subsequent shortfalls would increase income tax expense. Grants of restricted stock are valued based on the market price of MasTec’s common stock on the date of grant. Compensation expense arising from restricted stock grants with graded vesting is recognized using the ratable method (an accelerated method of expense recognition) over the vesting period. Those shares issued with cliff vesting are amortized on a straight line basis over the vesting period. Vesting periods for grants of restricted stock range from day of issuance to five years. For certain restricted share awards, the number of shares issued on the vesting date is net of the number of shares having the value required to satisfy the recipient’s minimum statutory tax withholding requirements. The Company then pays the corresponding withholding taxes to the appropriate taxing authorities in cash on behalf of the recipient. Although the withheld shares are not issued, they are treated as common stock repurchases in the consolidated financial statements, as they reduce the number of shares that would have been issued upon vesting. Stock option grants vest between one to five years after grant, have a term not to exceed ten years, and are generally forfeited if the holder terminates his or her employment or relationship with the Company or one of its affiliates. All option plans contain anti-dilutive provisions that require adjustment of the number of shares of common stock represented by each option for any stock splits or dividends. No stock options have been granted since 2006. For stock options granted in prior periods, the Black-Scholes valuation model was used to estimate the fair value of options to purchase MasTec’s common stock, which is no less than the fair market value of the underlying stock on the date of grant. The Company uses the ratable method to amortize compensation expense over the vesting period of the option grant. All outstanding grants were fully vested as of December 31, 2010. See Note 12 – Stock-Based Compensation and Other Employee Benefits Plans for further discussion. Multi-Employer Pension Plans The Company makes contributions to certain union-administered multi-employer pension plans, which are recorded as a component of employee wages and salaries within costs of revenue, excluding depreciation and amortization. Contributions are generally based on fixed amounts per hour per employee for employees covered under these plans. To the extent that those plans are underfunded, the Employee Retirement Income Security Act of 1974, as amended by the Multi-Employer Pension Plan Amendments Act of 1980, may subject the Company to substantial liabilities if the Company withdraws from such multi-employer plans or if they are terminated. In November 2011, the Company voluntarily withdrew from one of the multi-employer pension plans in which it participated and recorded a charge of $6.4 million within costs of revenue, excluding depreciation and amortization. Withdrawal liabilities under multi-employer pension plans are based on estimates of the Company’s proportionate share of the plan’s unfunded vested liability, as calculated by the plan’s actuaries, and represent the Company’s best estimate of such liabilities as of the time they are recorded. See Note 13 – Other Retirement Plans and Note 17 – Commitments and Contingencies for additional details. Litigation and Contingencies Litigation and contingencies are reflected in the consolidated financial statements based on management's assessments, along with legal counsel, of the expected outcome of litigation proceedings or the expected resolution of the contingency. Liabilities for estimated losses are accrued if the potential loss from any claim or legal proceeding is considered probable and the amount can be reasonably estimated. Significant judgment is required in both the determination of probability and the determination as to whether the amount of an exposure is reasonably estimable. Due to uncertainties related to these matters, accruals are based only on the information available at the time. As additional information becomes available, management reassesses potential liabilities related to pending claims and litigation and may revise its previous estimates. Treasury Stock The Company records treasury shares at cost. See Note 14 – Common Stock Activity. New accounting pronouncements Recently Issued Accounting Standards, Not Adopted as of December 31, 2012 In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”). The objective of ASU 2013-02 is to improve the reporting of reclassifications out of accumulated other comprehensive income. The amendments require disclosure of information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, disclosure is required, either on the face of the statement where net income is presented or in the notes, of significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures required under U.S. GAAP that provide additional detail about those amounts. The new requirements will take effect for public companies in interim and annual reporting periods beginning after December 15, 2012. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements. Recently Adopted Accounting Pronouncements In July 2012, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2012-02 Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment (“ASU 2012-02”). ASU 2012-02 permits an entity to first assess qualitative factors to determine whether it is "more likely than not" (or a likelihood greater than 50%) that an indefinite-lived intangible asset is impaired before performing quantitative impairment testing. ASU 2012-02 is effective for fiscal years beginning after September 15, 2012, with early adoption permitted. The Company adopted ASU 2012-02 in connection with its 2012 indefinite-lived intangible asset impairment assessment. See Note 5 – Goodwill and Other Intangible Assets. In May 2011, the FASB issued ASU 2011-04, Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and International Financial Reporting Standards (“ASU 2011-04”). The objective of ASU 2011-04 is to converge guidance of the FASB and the International Accounting Standards Board on fair value measurement and disclosure. This update changes the wording used to describe many of the requirements in U.S. GAAP for measuring fair value and disclosing information about fair value measurements; clarifies the FASB’s intent about the application of existing fair value measurement requirements; and changes particular principles or requirements for measuring fair value or for disclosing information about fair value measurements. ASU 2011-04, which the Company adopted as of January 1, 2012, was effective prospectively for interim and annual periods beginning after December 15, 2011. The wording of fair value disclosures in Note 6 - Fair Value of Financial Instruments corresponds to the new requirements. In June 2011, the FASB issued ASU 2011-05, Comprehensive Income (Topic 220): Presentation of Comprehensive Income (“ASU 2011-05”). The objective of ASU 2011-05 is to improve the comparability, consistency and transparency of financial reporting and to increase the prominence of items reported in other comprehensive income. ASU 2011-05 provides the option to present the total of comprehensive income, (equal to the components of net income and the components of other comprehensive income) either in a single continuous statement of comprehensive income or in two separate but consecutive statements. ASU 2011-05 eliminates the option to present the components of other comprehensive income as part of the statement of shareholders' equity as shown in the prior years. In December 2011, the FASB issued ASU 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in ASU 2011-05 (“ASU 2011-12”), which defers the provisions in ASU 2011-05 relating to the presentation of reclassification adjustments. ASU 2011-12 reinstates the requirements for the presentation of reclassifications out of accumulated other comprehensive income that were in place before ASU 2011-05. The remaining provisions of ASU 2011-05 are effective retrospectively for annual periods, and interim periods within those years, beginning after December 15, 2011. ASU 2011-12, which the Company adopted as of January 1, 2012, is effective for reporting periods beginning after December 15, 2011. See the consolidated statements of comprehensive income for related disclosures.

Earnings Per Share

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Earnings Per Share

Basic earnings per share is computed by dividing earnings available to MasTec’s common shareholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share is computed by dividing earnings by the number of fully diluted shares, which includes the effect of dilutive potential issuances of common shares, as determined using earnings from continuing operations. Potentially dilutive common shares include outstanding stock options and unvested restricted share awards, as calculated under the treasury stock method, as well as shares associated with the Company’s outstanding convertible debt securities.

The following table provides details of the Company’s earnings per share calculations for the periods indicated (in thousands, except per share amounts). Note that earnings per share calculations may contain slight summation differences due to rounding.



	Years Ended December 31,
	2012			2011		2010
Basic
Net income attributable to MasTec:
Net income from continuing operations	$	116,639		$	97,454	$	66,166
Net (loss) income from discontinued operations	(9,213		)	8,547		24,362
Basic net income attributable to MasTec	$	107,426		$	106,001	$	90,528
Weighted average shares outstanding	78,275			82,182		76,132
Basic earnings (loss) per share:
Continuing operations	$	1.49		$	1.19	$	0.87
Discontinued operations	(0.12		)	0.10		0.32
Total basic earnings per share	$	1.37		$	1.29	$	1.19
Diluted
Net income attributable to MasTec:
Basic net income from continuing operations	$	116,639		$	97,454	$	66,166
Interest expense on Original 4.0% Notes, net of tax	234			331		2,667
Interest expense on Original 4.25% Notes, net of tax	77			154		2,464
Diluted net income from continuing operations	$	116,950		$	97,939	$	71,297
Net (loss) income from discontinued operations	(9,213		)	8,547		24,362
Diluted net income attributable to MasTec	$	107,737		$	106,486	$	95,659
Shares:
Basic weighted average shares outstanding	78,275			82,182		76,132
Dilutive common stock equivalents	888			1,127		994
Dilutive premium shares, New 4.0% Notes	1,044			1,067		—
Dilutive premium shares, New 4.25% Notes	1,074			1,095		—
Dilutive shares, Original 4.0% Notes	612			862		7,297
Dilutive shares, Original 4.25% Notes	194			383		6,462
Diluted weighted average shares outstanding	82,087			86,716		90,885
Diluted earnings (loss) per share:
Continuing operations	$	1.42		$	1.13	$	0.78
Discontinued operations	(0.11		)	0.10		0.27
Total diluted earnings per share	$	1.31		$	1.23	$	1.05

For the years ended December 31, 2012, 2011 and 2010, a total of 2,032, 9,479 and 1,031,894 weighted average anti-dilutive common stock equivalents were not included in the Company’s diluted earnings per share calculations, respectively.

Senior Convertible Notes – Diluted Share Impact

The Company has $215 million of outstanding convertible notes. During the first quarter of 2011, the Company exchanged $105.3 million of its original 4.0% senior convertible notes (the “Original 4.0% Notes”) and $97.0 million of its original 4.25% senior convertible notes (the “Original 4.25% Notes” and, together with the Original 4.0% Notes, the “Original Notes”) for identical principal amounts of new 4.0% and 4.25% senior convertible notes (the “New 4.0% Notes” and the “New 4.25% Notes,” respectively and, collectively, the “New Notes”). The terms of the New Notes are substantially identical to the Original Notes, except that the New Notes have an optional physical (common share), cash or combination settlement feature and contain certain conditional conversion features. Due to the optional cash settlement feature and management’s intent to settle the principal amount thereof plus accrued interest in cash, the conversion shares underlying the outstanding principal amount of the New Notes, totaling approximately 13.0 million shares, are not required to be included in the Company’s diluted share count. If, however, the Company’s average stock price per share during the corresponding periods exceeds the $15.76 conversion price for the New 4.0% Notes or the $15.48 conversion price for the New 4.25% Notes, the weighted average of the resulting value in excess of the principal amount, converted to shares at the market price, is included in the Company’s weighted average diluted share count (“premium shares”).

The number of common shares issuable upon conversion of the Company’s Original Notes is reflected in the calculation of weighted average diluted earnings per share for the corresponding periods by application of the “if-converted” method to the extent their effect on the computation of earnings per share from continuing operations is dilutive. Under the “if-converted” method, net income from continuing operations is adjusted to add back the after-tax amount of interest recognized in the period associated with the convertible notes, and correspondingly, the convertible notes are assumed to have been converted with the resulting common shares added to weighted average shares outstanding.

The following table summarizes the principal amounts of the Company’s outstanding convertible notes for the periods indicated, including their respective classification within the computation of earnings per share for each period (in millions):



	Years Ended December 31,
	2012		2011		2010
Dilutive:
New 4.0% Notes (1)	$	105.3	$	105.3	N/A
New 4.25% Notes (1)	97.0		97.0		N/A
Original 4.0% Notes (2)	9.7		9.7		115.0
Original 4.25% Notes (2)	3.0		3.0		100.0
Total principal amount, dilutive outstanding convertible notes	$	215.0	$	215.0	$	215.0

(1)Dilutive shares associated with the New Notes are attributable to the premium over the respective conversion prices.

(2)Dilutive shares associated with the Original Notes are attributable to the underlying principal amounts.

The Company’s average stock price for the years ended December 31, 2012 and 2011 exceeded the conversion prices of the New Notes. The number of premium shares included in the Company’s diluted share count varies with fluctuations in the Company’s actual share price for the related periods. Higher share prices result in a greater number of equivalent premium shares. Details of the calculation underlying the number of premium shares included in the Company’s diluted share count for the periods indicated are as follows (in thousands, except per share amounts):



	As of and for the Year Ended December 31, 2012				As of and for the Year Ended December 31, 2011
	New 4.0% Notes		New 4.25% Notes		New 4.0% Notes		New 4.25% Notes
Principal amount	$	105,322	$	97,000	$	105,322	$	97,000
Conversion price per share	$	15.76	$	15.48	$	15.76	$	15.48
Number of conversion shares, principal amount	6,683		6,268		6,683		6,268
Weighted average actual per share price	$	18.68	$	18.68	$	18.90	$	18.88
Excess over principal amount	$	19,494	$	20,064	$	20,968	$	21,139
Weighted average equivalent premium shares	1,044		1,074		1,067		1,095

See Note 14 - Common Stock Activity.

Acquisitions and Other Investments

12 Months Ended

Dec. 31, 2012

Business Combinations [Abstract]

Acquisitions and Other Investments

– Acquisitions and Other Investments

Allocations of purchase prices for acquisitions are based on estimates of the fair value of consideration paid and of the net assets acquired and are subject to adjustment upon finalization of these fair value estimates. As of December 31, 2012, the purchase prices, including the estimated fair value of contingent consideration and the related purchase price allocations for businesses acquired by the Company during 2012 were preliminary. The Company will revise its preliminary allocations if new information is obtained about the facts and circumstances existing as of the date of acquisition, which, if originally known, would have resulted in the recognition of, or adjusted fair values of, those assets and liabilities as of that date. Adjustments to the initial allocation of purchase price during the measurement period may require revision of comparative prior period financial information when reissued in subsequent financial statements. The effect of measurement period adjustments to the allocation of purchase price would be as if the adjustments had been taken into account on the date of acquisition. The effects of measurement period adjustments may cause changes in depreciation, amortization, or other income or expense recognized in prior periods. All changes that do not qualify as measurement period adjustments are included in current period earnings.

See discussion below for details of the Company's 2012 acquisitions.

2012 Acquisitions

Bottom Line Services

Effective December 1, 2012, MasTec acquired all of the issued and outstanding interests of Bottom Line Services, LLC ("BLS") for an aggregate purchase price composed of approximately $67.6 million in cash, and a five year earn-out, valued at $11.1 million as of the date of acquisition. The earn-out is equal to 20% of the excess, if any, of BLS's annual EBITDA over $17 million dollars payable annually at MasTec's election in common stock, cash or a combination, thereof.

BLS is engaged in providing natural gas and petroleum pipeline infrastructure services, primarily in eastern Texas. Its services include pipeline and facilities construction, painting and maintenance services. The acquisition of BLS provides MasTec with greater penetration in this key market and additional service offerings within pipeline infrastructure construction.

The following table summarizes the estimated fair value of consideration paid and the allocation of purchase price as of the date of acquisition (in millions). The allocation of purchase price to the fair value of tangible and intangible assets and liabilities, including the estimated value of the earn-out obligation and the estimated useful lives of acquired assets, is provisional and remains preliminary as management continues to assess the valuation of these items and any ultimate purchase price adjustments based on the final assets and net working capital, as prescribed by the purchase agreement.



	December 1, 2012
Purchase price consideration:
Cash	$	67.6
Fair value of contingent consideration (earn-out liability)	11.1
Total consideration transferred	$	78.7
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Current assets	$	36.4
Property and equipment	12.6
Trade name	2.6
Non-compete agreements	0.5
Customer relationships	24.4
Current liabilities	(10.4		)
Total identifiable net assets	$	66.1
Goodwill	$	12.6
Total consideration allocated	$	78.7

Intangible assets will be amortized in a manner consistent with the pattern in which the related benefits are expected to be consumed. Customer relationships and the trade name will each be amortized over a ten year life, and the non-compete agreements will be amortized over their ten year terms. Goodwill arising from the acquisition represents the estimated value of BLS's geographic presence in key high growth markets, its assembled workforce, its management team's industry-specific project management expertise and synergies expected to be achieved from the combined operations of BLS and MasTec. Estimated tax deductible goodwill was $1.6 million as of the date of acquisition.

The fair value of the earn-out obligation was estimated using an income approach and incorporates significant inputs not observable in the market. Key assumptions in the estimated valuation include the discount rate and probability-weighted EBITDA projections. The range of potential undiscounted payments that MasTec could be required to make under the earn-out arrangement was estimated to be between $0 and $22 million; however, there is no maximum earn-out payment amount.

BLS's earnings have been consolidated as of the effective date of the acquisition, December 1, 2012. BLS is reported within the Company's Oil & Gas segment.

Other 2012 Acquisitions

Effective December 1, 2012, MasTec acquired all of the issued and outstanding interests of Go Green Services, LLC and all of the issued and outstanding shares of Dynamic Tower Services, Inc. ("DTS"). The earnings of both companies have been consolidated as of the effective date of the acquisitions, December 1, 2012. Go Green was formerly a subcontractor to MasTec's oil and gas business and provides self-perform clearing and trenching services for natural gas and petroleum pipeline infrastructure construction in the Company's Oil & Gas segment. DTS was formerly a subcontractor to MasTec's wireless business and will provide self-perform communications tower construction, installation, maintenance and other services in support of telecommunications infrastructure construction in the Company's Communications segment.

Unaudited Pro Forma Information – 2012 Acquisitions

The following unaudited supplemental pro forma results of operations include the results of operations of each of the companies acquired in 2012 described above as if each had been consolidated as of January 1, 2011, and have been provided for illustrative purposes only and do not purport to be indicative of the actual results that would have been achieved by the combined companies for the periods presented or that may be achieved by the combined companies in the future. Future results may vary significantly from the results reflected in the following pro forma financial information because of future events and transactions, as well as other factors, many of which are beyond MasTec’s control.

The unaudited pro forma combined results of operations for the years ended December 31, 2012 and 2011 have been prepared by adjusting the historical results of MasTec to include the historical results of the acquisitions described above as if they occurred January 1, 2011. These pro forma combined historical results were then adjusted for an increase in amortization expense due to the incremental intangible assets recorded related to the acquisitions and the reduction of interest income as a result of the cash consideration paid. The pro forma results of operations do not include any adjustments to eliminate the impact of acquisition related costs or any cost savings or other synergies that may result from these acquisitions. As noted above, the pro forma results of operations do not purport to be indicative of the actual results that would have been achieved by the combined company for the periods presented or that may be achieved by the combined company in the future.



	Year Ended December 31,
	2012		2011
	(unaudited, in millions)
Revenue	$	3,879.1	$	2,931.1
Net income	$	119.4	$	112.3

Revenues of $12.9 million and net income of $0.1 million resulting from the year over year incremental impact of the Company’s 2012 acquisitions are included in MasTec’s consolidated results of operations for year ended December 31, 2012. Acquisition costs of $0.7 million incurred in connection with these acquisitions were included in general and administrative costs for the year ended December 31, 2012.

2011 Acquisitions

During the second quarter of 2011, the Company acquired certain businesses, as discussed below. During the second quarter of 2012, the Company revised its preliminary allocations for certain of these acquisitions based on information about the facts and circumstances existing as of the respective dates of such acquisitions and for purchase price adjustments based on the final net assets and net working capital, as prescribed by the relevant purchase agreements. These adjustments resulted in the recognition of, or adjusted the fair values of, certain acquired assets and liabilities, resulting in the revision of comparative prior period financial information. The effects of measurement period adjustments on the allocations of purchase prices for acquired businesses are presented in the Company's financial statements as if the adjustments had been taken into account as of the respective dates of acquisition. All changes that do not qualify as measurement period adjustments are included in current period earnings.

EC Source

In November 2010, MasTec entered into a membership interest purchase agreement and invested $10 million in exchange for a 33% voting interest in EC Source Services LLC (“EC Source”) and a two-year option (the “EC Source Merger Option”) that granted MasTec the right, but not the obligation, to acquire the entirety of EC Source’s outstanding equity pursuant to the terms of a merger agreement. EC Source is a nationally recognized full-service engineering, procurement and construction services company that installs extra high voltage (“EHV”) electrical transmission systems throughout North America.

On April 29, 2011, the Company exercised its EC Source Merger Option and, effective May 2, 2011, acquired the remaining 67% membership interest in EC Source for a total ownership percentage of 100%, for an aggregate purchase price composed of 5,129,642 shares of MasTec common stock, valued at $94.2 million, $0.3 million in cash and a five year earn-out, valued at $25.0 million as of the date of acquisition. The earn-out is equal to 20% of the excess, if any, of EC Source’s annual earnings before interest, taxes, depreciation and amortization (“EBITDA”), as defined in the purchase agreement, over $15 million, payable annually at MasTec’s election in common stock, cash or a combination thereof. The MasTec shares issued on the effective date are subject to transfer restrictions, 25% of which lapsed on May 2, 2012, 25% of which will lapse on May 2, 2013, and 50% of which will lapse on May 2, 2014. In addition, the Company assumed $8.6 million of debt, which relates primarily to equipment loans payable to the former owner of EC Source, all of which remains outstanding as of December 31, 2012.

The fair value of the shares transferred was based on MasTec’s quoted market price on the closing date, discounted by 10%, 15% and 20% for the estimated effect of the first, second and third year transfer restrictions, respectively. The fair value of the 33% equity investment in EC Source was estimated to be $39.6 million immediately before the closing of the merger, resulting in a gain on remeasurement of $29.0 million, which was reflected as a component of other income in the Company’s results of operations during the second quarter of 2011. The fair value of the equity investment was determined based on the implied consideration transferred as of the date of the business combination, discounted for the Company’s lack of control as a minority shareholder. The fair value of both the shares transferred and the equity investment were based on Level 2 fair value inputs.

The following table summarizes the estimated fair value of consideration paid and the allocation of purchase price as of date of acquisition (in millions):



	May 2, 2011
Purchase price consideration:
Shares transferred	$	94.2
Cash	0.3
Fair value of contingent consideration (earn-out liability)	25.0
Total consideration transferred	$	119.5
Fair value of equity investment	$	39.6
Fair value of total consideration	$	159.1
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Current assets	21.0
Property and equipment	10.1
Pre-qualifications	31.3
Backlog	11.0
Non-compete agreements	1.5
Current liabilities	(13.4		)
Debt	(8.6		)
Deferred income taxes	(14.5		)
Total identifiable net assets	$	38.4
Goodwill	$	120.7
Total consideration allocated	$	159.1

Intangible assets will be amortized in a manner consistent with the pattern in which the related benefits are expected to be consumed. The intangible asset related to backlog will be amortized over the expected remaining 3 year term of these contracts. The intangible asset related to the non-compete agreements will be amortized over their 7 year terms. The intangible asset related to EC Source’s pre-qualifications with companies in the utilities industry has been assigned an indefinite life as the pre-qualifications do not expire or diminish in value, and the companies to which they relate have extremely long operating histories.

Goodwill arising from the acquisition represents the expected value of EC Source’s geographic presence in key high growth markets, its assembled workforce, its management team’s industry-specific project management expertise and synergies expected to be achieved from the combined operations of EC Source and MasTec. The estimated goodwill balance is not tax deductible.

The fair value of the earn-out obligation was estimated using an income approach and incorporates significant inputs not observable in the market. Key assumptions in the estimated valuation include the discount rate and probability-adjusted EBITDA projections. The range of potential undiscounted payments that MasTec could be required to make under the earn-out arrangement was estimated to be between $0 and approximately $55 million; however, there is no maximum earn-out payment amount.

EC Source’s earnings have been consolidated as of the effective date of the acquisition, May 2, 2011. Prior to the effective date of the acquisition, the Company’s investment in EC Source was accounted for under the equity method of accounting. EC Source is reported within the Company's Electrical Transmission segment.

Fabcor

Effective April 1, 2011, MasTec acquired all of the issued and outstanding shares of Fabcor TargetCo Ltd. (“Fabcor Parent” and, together with its wholly-owned Canadian subsidiaries, Fabcor 2001, Inc. and Fabcor Pipelines B.C. Inc., “Fabcor”) for an aggregate purchase price composed of approximately $24.2 million in cash, including a $1.4 million post-closing purchase price adjustment based on Fabcor’s final closing tangible net worth and net working capital, recorded in the second quarter of 2012, and a five year earn-out, valued at $16.9 million as of the date of acquisition. The earn-out is equal to 30% of the excess, if any, of Fabcor's annual EBITDA over 3.6 million Canadian dollars (approximately U.S. $3.6 million as of December 31, 2012), payable annually to the seller in cash in Canadian dollars. In addition, the Company assumed $7.0 million of debt that was repaid immediately.

Fabcor is engaged in providing natural gas and petroleum pipeline infrastructure construction services in Western Canada. Its services include: new pipeline construction; pipeline modification and replacement; river crossing construction and replacement; integrity excavation programs; well-site construction; compressor construction; gas plant construction; compressor and gas plant modifications; and plant commissioning support services. Fabcor provides MasTec the ability to expand its energy infrastructure services within the Canadian market and participate in the significant opportunities anticipated in that market in the future.

The following table summarizes the estimated fair value of consideration paid and the allocation of purchase price as of the date of acquisition (in millions):



	April 1, 2011
Purchase price consideration:
Cash	$	24.2
Fair value of contingent consideration (earn-out liability)	16.9
Total consideration transferred	$	41.1
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Current assets	$	24.3
Property and equipment	12.8
Trade names	0.7
Non-compete agreements	0.1
Customer relationships	3.1
Backlog	0.4
Current liabilities	(24.1		)
Deferred income taxes and other liabilities	(4.3		)
Total identifiable net assets	$	13.0
Goodwill	$	28.1
Total consideration allocated	$	41.1

Intangible assets will be amortized in a manner consistent with the pattern in which the related benefits are expected to be consumed. The intangible asset related to backlog was amortized over the remaining nine months of 2011. Customer relationships will be amortized over a 12 year life, and the non-compete agreements will be amortized over their 7 year terms. Goodwill arising from the acquisition represents the estimated value of Fabcor’s geographic presence in key high growth Canadian markets, its assembled workforce, its management team’s industry-specific project management expertise and synergies expected to be achieved from the combined operations of Fabcor and MasTec. The estimated goodwill balance is not tax deductible.

The fair value of the earn-out obligation was estimated using an income approach and incorporates significant inputs not observable in the market. Key assumptions in the estimated valuation include the discount rate and probability-adjusted EBITDA projections. The range of potential undiscounted payments that MasTec could be required to make under the earn-out arrangement was estimated to be between $0 million and $25 million; however, there is no maximum earn-out payment amount.

Fabcor’s earnings have been consolidated as of the effective date of the acquisition, April 1, 2011. Fabcor is reported within the Company's Oil & Gas segment.

Other 2011 Acquisitions

The Company made certain other acquisitions during 2011 that were not material individually or in the aggregate.

Cam Com. Effective April 1, 2011, MasTec purchased 100% of the capital stock of Cam Communications Inc. (“Cam Com”), a Maryland company that provides telephone, cabling, engineering, construction, equipment integration, testing, wiring and computer network services to telecommunications carriers for approximately $4.4 million in cash, the assumption of $0.3 million of capital leases and a five year earn-out payable in cash equal to 20% of the excess, if any, of Cam Com’s annual EBITDA over $2.25 million, plus an additional one time cash payment of up to $1.5 million if Cam Com’s EBITDA exceeds $1.5 million for the first twelve months following the acquisition. The estimated fair value of the contingent consideration arrangements was approximately $3.0 million as of the date of the acquisition.

Optima. Effective June 1, 2011, MasTec acquired 100% of the issued and outstanding shares of Optima Network Services, Inc. (“Optima”), a wireless infrastructure services company headquartered in California, for $5.1 million in cash, plus the assumption of $2.2 million in debt, $0.8 million of which was repaid immediately. In addition, the purchase price for Optima includes a five year earn-out, equal to 20% of the excess, if any, of Optima’s annual EBITDA over $3.0 million, plus an additional one-time cash payment of up to approximately $5.0 million if Optima’s EBITDA exceeds $1.5 million in the first twelve months following the date of acquisition. The potential earn-out is payable, at MasTec’s election, in common stock, cash, or a combination thereof. The estimated fair value of the contingent consideration arrangement related to Optima was increased by $1.5 million to $3.0 million in the second quarter of 2012 to reflect additional information and analysis.

Halsted. Effective June 30, 2011, MasTec acquired 100% of the issued and outstanding capital stock of Halsted Communications, Ltd. (“Halsted”), an install-to-the-home contractor operating primarily in portions of New York, Pennsylvania and New England for $4.0 million in cash, plus the assumption of approximately $7.9 million of debt, of which $4.4 million was repaid immediately. Halsted’s primary customer is DIRECTV^®. During the second quarter of 2012, $3.9 million of additional goodwill and workers compensation liabilities related to the Halsted Communications, Ltd. ("Halsted") acquisition were recorded as a result of final claims data for the pre-acquisition period.

Cam Com, Optima and Halsted are reported within the Company's Communications segment.

Unaudited Pro Forma Information – 2011 Acquisitions

The following unaudited supplemental pro forma results of operations include the results of operations of each of the companies acquired in 2011 described above as if each had been consolidated as of January 1, 2010, and have been provided for illustrative purposes only and do not purport to be indicative of the actual results that would have been achieved by the combined companies for the periods presented or that may be achieved by the combined companies in the future. Future results may vary significantly from the results reflected in the following pro forma financial information because of future events and transactions, as well as other factors, many of which are beyond MasTec’s control.

The unaudited pro forma combined results of operations for the years ended December 31, 2011 and 2010 have been prepared by adjusting the historical results of MasTec to include the historical results of the acquisitions described above as if they occurred January 1, 2010. These pro forma combined historical results were then adjusted for an increase in amortization expense due to the incremental intangible assets recorded related to the acquisitions and the reduction of interest income as a result of the cash consideration paid. The pro forma results of operations do not include any adjustments to eliminate the impact of acquisition related costs or any cost savings or other synergies that may result from these acquisitions. As noted above, the pro forma results of operations do not purport to be indicative of the actual results that would have been achieved by the combined company for the periods presented or that may be achieved by the combined company in the future.



	Year Ended December 31,
	2011		2010
	(unaudited, in millions)
Revenue	$	3,115.6	$	2,506.0
Net income	$	105.5	$	85.6

Revenues of $164.7 million and net income of $11.6 million resulting from the year over year incremental impact of the Company’s 2011 acquisitions are included in MasTec’s consolidated results of operations for year ended December 31, 2012. Revenues of $265.3 million and net income of $10.8 million resulting from the Company’s 2011 acquisitions are included in MasTec’s consolidated results of operations for the year ended December 31, 2011. Acquisition costs of $1.6 million incurred in connection with these acquisitions were included in general and administrative costs for the year ended December 31, 2011.

Nsoro

On December 24, 2010, MasTec entered into an amendment to the asset purchase agreement with the seller of Nsoro, LLC ("Nsoro"), which was acquired by the Company in 2008. Under the revised terms, MasTec paid and delivered to the seller a one time $40 million cash payment plus 1,875,000 shares of MasTec common stock, which were restricted for one year from the date of issuance. These shares were valued at $27 million, based on the average market price five days before and after the terms of the amendment were agreed to and announced. The amendment significantly reduced potential future earn-out payments in exchange for upfront consideration. The total payment of upfront purchase price consideration, valued at $67 million, was recorded as additional goodwill. Future annual earn-out payments for the five years beginning in 2011 are calculated as 27.5% of domestic annualized earnings before tax in excess of $40 million, payable, at MasTec’s sole option, in either cash, shares of MasTec common stock, or any combination thereof.

Nsoro is reported within the Company's Communications segment.

Other Investments

Through a 60%-owned consolidated subsidiary, MasTec owns a 34% interest in a rock extraction business in Panama (for a net beneficial ownership interest of 20.4%). This investment, which is a component of the Company's discontinued Globetec operation, is accounted for under the equity method of accounting, and is reflected within long-term assets of discontinued operations in the consolidated financial statements. MasTec performed construction services for this investee and revenues of approximately $2.3 million, $3.7 million and $1.8 million are included within the Company's results from discontinued operations for the years ended December 31, 2012, 2011 and 2010, respectively. Receivables from this investee, which are reflected within assets held for sale in the consolidated financial statements, were approximately $3.7 million and $6.7 million as of December 31, 2012 and 2011, respectively, of which $4.3 million was classified as long term as of December 31, 2011.

The Company has certain other cost and equity method investments. None of these investments was material individually or in the aggregate as of any year presented. No impairment charges related to the Company's cost method investments nor the Company's equity method investments were recorded during the three years in the period ended December 31, 2012.

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 88-16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 17: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph F4
-Subparagraph e
-Appendix F

Reference 18: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51, 52
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Paragraph 67-73
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

12 Months Ended

Dec. 31, 2012

Discontinued Operations

DirectStar

In May 2012, Red Ventures exercised its option to acquire from the Company all of the issued and outstanding equity interests in DirectStar, which provides marketing and sales services on behalf of DIRECTV®. The sale of DirectStar to Red Ventures was consummated in June 2012. The Company sold DirectStar for a net sale price of $98.9 million in cash. The DirectStar Business is presented as a discontinued operation in the Company’s consolidated financial statements for all periods presented.

The following is a summary of assets and liabilities associated with the DirectStar Business as of the dates indicated (in millions):



	May 31, 2012		December 31, 2011
Assets:
Current assets	$	12.0	$	9.8
Property and equipment, net	1.2		1.4
Goodwill and other intangible assets, net	104.0		101.2
Assets of discontinued operations	$	117.2	$	112.4
Liabilities:
Accounts payable and accrued expenses	$	10.6	$	9.6
Other current liabilities, including accrued earn-outs	7.4		10.6
Liabilities of discontinued operations	$	18.0	$	20.2

Results from discontinued operations associated with the DirectStar Business for the periods indicated were as follows (in millions):



	For the Years Ended December 31,
	2012			2011			2010
Revenue	$	60.2		$	148.5		$	143.3
Income from operations before provision for income taxes	6.2			22.1			42.9
Loss on disposal before provision for income taxes	(0.2		)	—			—
Provision for income taxes	$	(2.3	)	$	(8.4	)	$	(16.3	)
Net income from discontinued operations	$	3.7		$	13.7		$	26.6

Globetec

In September 2012, the Company's board of directors voted to approve a plan of sale for its Globetec business. The decision to sell was made after evaluation of, among other things, short and long-term prospects of the Globetec operation. Accordingly, Globetec's projects and assets are reflected as assets and liabilities of discontinued operations in the consolidated balance sheets for all periods presented, and Globetec's results of operations are presented as discontinued operations in the consolidated statements of operations for all periods presented.

As of December 31, 2012, the carrying value of the subject net assets held-for-sale was $21.7 million. This amount is comprised of total assets of $26.3 million and total liabilities of $4.6 million. For the year ended December 31, 2012, the Company recognized impairment charges of approximately $6.4 million pertaining to goodwill associated with the Globetec operation. In addition, the Company recognized additional estimated losses on disposal of approximately $6.3 million in connection with its decision to sell of the Globetec operation. This estimate was based on an evaluation of, among other things, the expected cash flows from the operation of the projects of the Globetec business, as well as the estimated net realizable value of the assets to be sold.

Management is currently in discussions with at least one potential buyer and is discussing a selling price which considers the Company's view of the estimated fair value of the net assets that have been classified as held-for-sale as of December 31, 2012. The Company's estimates are subject to change in the future. If the Company is not able to sell these projects and assets at the currently estimated selling price, the Company may incur additional losses in the future.

The following is a summary of assets and liabilities associated with the Globetec operation as of the dates as indicated (in millions):



	December 31, 2012		December 31, 2011
Assets:
Current assets	$	18.6	$	20.8
Property and equipment, net	2.0		2.2
Goodwill and other intangible assets, net	—		6.4
Other long-term assets	5.7		10.5
Assets of discontinued operations	$	26.3	$	39.9
Liabilities:
Accounts payable and accrued expenses	$	0.9	$	6.1
Other current liabilities	3.7		3.0
Liabilities of discontinued operations	$	4.6	$	9.1

Results from discontinued operations associated with Globetec for the periods indicated were as follows (in millions):



	For the Years Ended December 31,
	2012			2011			2010
Revenue	$	18.8		$	29.2		$	21.7
Loss from operations before benefit from income taxes	(7.0		)	(7.4		)	(3.0		)
Impairment of assets, disposal group, before benefit from income taxes	(12.7		)	—			—
Benefit from income taxes	$	6.8		$	2.2		$	0.7
Net loss from discontinued operations	$	(12.9	)	$	(5.2	)	$	(2.3	)

Included within the above results from discontinued operations for the DirectStar Business and Globetec are $0.6 million, $1.1 million and $0.9 million of depreciation and amortization for the years ended December 31, 2012, 2011, and 2010, respectively.

The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).

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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2012

Goodwill and Other Intangible Assets

The following table sets forth information for the Company’s goodwill and intangible assets as of the dates indicated (in millions):



	December 31, 2012			Weighted Average Amortization Period	December 31, 2011			Weighted Average Amortization Period
Amortizing intangible assets:⁽¹⁾
Gross carrying amount	$	129.4			$	95.8
Less: accumulated amortization	(58.5		)		(51.3		)
Amortizing intangible assets, net	$	70.9		12 years	$	44.5		14 years
Non-amortizing intangible assets:
Trade names	$	34.9			$	34.9
Pre-qualifications	31.3				31.3
Non-amortizing intangible assets	66.2				66.2
Goodwill	$	820.3			$	714.8
Goodwill and other intangible assets	$	957.4			$	825.5

(1)Consists principally of customer relationships, backlog, trade names and non-compete agreements with finite lives.

See Note 4 - Discontinued Operations for information pertaining to goodwill and other intangible assets of discontinued operations.

The following table provides a reconciliation of changes in goodwill and other intangible assets for the years indicated (in millions):



				Other Intangible Assets
	Goodwill			Non-amortizing		Amortizing			Total
Balance as of December 31, 2010	$	525.6		$	34.9	$	36.0		$	596.5
Additions from new business combinations	177.4			31.3		22.4			$	231.1
Accruals of acquisition-related contingent consideration ^(a)	11.8								$	11.8
Amortization expense						(13.9		)	$	(13.9	)
Balance as of December 31, 2011	$	714.8		$	66.2	$	44.5		$	825.5
Additions from new business combinations	80.2			—		38.6			$	118.8
Accruals of acquisition-related contingent consideration ^(a)	25.5								$	25.5
Amortization expense						(12.2		)	$	(12.2	)
Currency translation	(0.2		)	—		—			$	(0.2	)
Balance as of December 31, 2012	$	820.3		$	66.2	$	70.9		$	957.4


(a)	Represents contingent consideration for acquisitions prior to January 1, 2009, which is only accrued as earned, in accordance with U.S. GAAP.

The following table provides a reconciliation of changes in goodwill by reportable segment for the years indicated (in millions):



	Communications		Electrical Transmission		Oil & Gas			Power Generation & Industrial		Total Goodwill
Balance as of December 31, 2010	$	227.9	$	8.8	$	171.4		$	117.5	$	525.6
Additions from new business combinations	28.6		120.7		28.1			—		$	177.4
Accruals of acquisition-related contingent consideration^(a)	1.5		—		10.3			—		$	11.8
Balance as of December 31, 2011	$	258.0	$	129.5	$	209.8		$	117.5	$	714.8
Additions from new business combinations	36.5		—		43.7			—		$	80.2
Accruals of acquisition-related contingent consideration ^(a)	7.7		—		17.8			—		$	25.5
Currency translation	—		—		(0.2		)	—		$	(0.2	)
Balance as of December 31, 2012	$	302.2	$	129.5	$	271.1		$	117.5	$	820.3


(a)	Represents contingent consideration for acquisitions prior to January 1, 2009, which is only accrued as earned, in accordance with U.S. GAAP.

See Note 16 - Segments and Operations by Geographic Area for details pertaining to the Company's reportable segments.

Information about estimated future amortization expense associated with amortizing intangible assets, including those associated with preliminary purchase price allocations, is summarized in the following table (in millions):



	Amortization Expense
2013	$	16.4
2014	11.8
2015	9.0
2016	6.9
2017	5.3
Thereafter	21.5
Total	$	70.9

Annual Impairment Review. Management performs its annual impairment review of goodwill and intangible assets with indefinite lives during the fourth quarter each year at the reporting unit level, which is one level below the Company's reportable segments. A reporting unit is an operating segment or one level below an operating segment, also referred to as a component. Net assets of acquired businesses and related goodwill are allocated to the corresponding reporting units upon acquisition. Management identifies its Company’s reporting units by assessing whether components have discrete financial information available and if segment management regularly reviews the operating results of that component. To the extent that two or more components are deemed economically similar, those components are aggregated into one reporting unit for purposes of the Company’s annual goodwill impairment review. No components have been aggregated for the annual impairment review.

During the years ended December 31, 2012 and 2011, the Company assessed qualitative factors to determine whether it was more likely than not that the fair value of the Company’s reporting units were less than their carrying amounts as a basis for determining whether it was necessary to perform the traditional two-step goodwill impairment test. Based on these analyses, none of the Company’s reporting units were considered more likely than not to be impaired as of December 31, 2012 or 2011. During the year ended December 31, 2010, management estimated the fair values of the Company’s reporting units using a discounted cash flow methodology, which incorporated five-year projections of revenues, operating costs and cash flows considering historical and anticipated future results, general economic and market conditions, as well as the impact of planned business and operational strategies. Management applied a discounted cash flow technique utilizing a terminal value equal to 5.5 times year five EBITDA, which is defined as income from continuing operations before non-controlling interests before interest, taxes, depreciation and amortization. The discount rate was estimated to be 8.5% per annum and represented the Company’s estimated cost of capital at the time of the analysis. A 100 basis point change in the discount rate would not have had a material impact on the results of the impairment analyses. Based upon the Company's analysis, the estimated fair values of the Company’s reporting units for its continuing operations businesses were determined to substantially exceed their carrying values for each of the three years in the period ended December 31, 2012. In September 2012, MasTec's board of directors approved a plan of sale for the Globetec business. In connection with its decision to sell Globetec, the Company recognized impairment losses of $12.7 million, including $6.4 million of goodwill impairment charges, during the third quarter of 2012.

During the year ended December 31, 2012, the Company assessed qualitative factors to determine if it was more likely than not that the fair values of its indefinite-lived intangible assets were less than their carrying amounts. For the years ended December 31, 2011 and 2010, management estimated the fair values of its indefinite-lived intangible assets based on estimates of growth rates for the related businesses and estimated future economic conditions. Based upon the results of these analyses, there were no impairments of the Company's indefinite-lived intangible assets for its continuing operations businesses in any of the years in the three year period ended December 31, 2012.

See Note 4 - Discontinued Operations for details of the Globetec discontinued operation.

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Carrying amounts and estimated fair values of financial instruments as of the dates indicated were as follows (in millions):



	December 31, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets
Cash surrender value of life insurance policies	$	11.9	$	11.9	$	10.6	$	10.6
Auction rate securities	14.4		14.4		13.6		13.6

Liabilities
Deferred compensation plan liabilities	$	3.3	$	3.3	$	2.2	$	2.2
Acquisition-related contingent consideration	143.6		143.6		80.5		80.5
7.625% senior notes	150.0		154.9		150.0		156.4
Original 4.0% Notes	9.7		15.9		9.7		12.5
Original 4.25% Notes	3.0		5.1		3.0		4.0
New 4.0% Notes	100.9		101.5		98.2		99.4
New 4.25% Notes	92.1		92.7		89.9		91.1

The following methods and assumptions were used to estimate the fair values of financial instruments:

Cash Surrender Value of Life Insurance Policies. Cash surrender values of life insurance policies are based on current cash surrender values as quoted by insurance carriers. Life insurance policies support the Company’s split dollar agreements and deferred compensation plan assets.

Auction Rate Securities. The fair value of the Company’s auction rate securities was estimated by an independent valuation firm, Houlihan Capital Advisors, LLC, using a probability weighted discounted cash flow model.

Deferred Compensation Plan Liabilities. Deferred compensation plan liabilities are based on employee deferrals, together with Company matching contributions, which are valued according to employee-directed investment options. The fair value of deferred compensation plan liabilities is based on quoted market prices of the underlying employees' investment selections. See Note 12 - Stock-Based Compensation and Other Employee Benefit Plans.

Acquisition-Related Contingent Consideration Acquisition-related contingent consideration in the table above represents the estimated fair value of additional future earn-outs payable for acquisitions of businesses that closed after January 1, 2009, in accordance with U.S. GAAP. The fair value of such acquisition-related contingent consideration is based on management’s estimates and entity-specific assumptions and is evaluated on an on-going basis. The Company completed eight acquisitions during 2012 and 2011, as described in Note 3 - Acquisitions and Other Investments, most of which include earn-out agreements.

Debt. The estimated fair values of the Company’s 7.625% senior notes and Original Notes, which are measured on a nonrecurring basis, are based on quoted market prices, a Level 1 input. The estimated fair value of the debt component of the Company’s New Notes is calculated using an income approach, based on a discounted cash flow model. This method is based on management’s estimates of the Company’s market interest rate for a similar nonconvertible instrument.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

As of December 31, 2012, the Company held certain assets and liabilities required to be measured at fair value on a recurring basis. The fair value hierarchy requires the use of observable market data when available. In instances in which the inputs used to measure fair value fall into different levels of the fair value hierarchy, the fair value measurement classification below has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. Management’s assessment of the significance of a particular item to the fair value measurement in its entirety requires judgment, including the consideration of inputs specific to the asset or liability. The fair values of financial assets and liabilities measured on a recurring basis were determined using the following inputs as of the dates indicated (in millions):



			Fair Value Measurements Using Inputs Considered as Significant
	Fair Value as of December 31, 2012		Level 1		Level 2	Level 3
Assets
Cash surrender value of life insurance policies	$	11.9	$	11.9	—	—
Auction rate securities	$	14.4	—		—	$	14.4

Liabilities
Deferred compensation plan liabilities	$	3.3	$	3.3	—	—
Acquisition-related contingent consideration	$	143.6	—		—	$	143.6

			Fair Value Measurements Using Inputs Considered as Significant
	Fair Value as of December 31, 2011		Level 1		Level 2	Level 3
Assets
Cash surrender value of life insurance policies	$	10.6	$	10.6	—	—
Auction rate securities	$	13.6	—		—	$	13.6

Liabilities
Deferred compensation plan liabilities	$	2.2	$	2.2	—	—
Acquisition-related contingent consideration	$	80.5	—		—	$	80.5

The following tables provide a reconciliation between the beginning and ending balances of items measured at fair value on a recurring basis using significant unobservable inputs for the periods indicated (in millions).



	Auction Rate Securities
Assets	Student Loan			Structured Finance Securities			Total
Balances as of December 31, 2010	$	16.4		$	2.6		$	19.0
Redemption or sale of securities, cost basis	(4.6		)	—			(4.6		)
Reversal of unrealized losses on redeemed or sold securities	0.5			—			0.5
Changes in fair value recorded in earnings	—			(0.6		)	(0.6		)
Changes in unrealized (losses) gains included in other comprehensive income	(0.4		)	(0.3		)	(0.7		)
Balances as of December 31, 2011	$	11.9		$	1.7		$	13.6
Changes in fair value recorded in earnings	—			—			—
Changes in unrealized (losses) gains included in other comprehensive income	(0.2		)	1.0			0.8
Balances as of December 31, 2012	$	11.7		$	2.7		$	14.4

Liabilities	Acquisition-Related Contingent Consideration
Balance as of December 31, 2010	$	45.0
Additions from new business combinations	47.7
Payments of contingent consideration	(12.2		)
Balance as of December 31, 2011	$	80.5
Additions from new business combinations	66.7
Payments of contingent consideration	(3.6		)
Valuation gains/losses recorded in earnings	—
Balance as of December 31, 2012	$	143.6

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

Assets and liabilities recognized or disclosed at fair value on a nonrecurring basis include items such as equity method investments, goodwill and long-lived assets, which are initially measured at fair value, and are subsequently remeasured in the event of an impairment or other measurement event, if applicable. Except for the assets and liabilities associated with the Globetec operation, which the Company reclassified as held-for-sale in the third quarter of 2012 and the Company’s equity investment in EC Source, which was remeasured in connection with the Company’s acquisition of EC Source’s remaining equity interests in the second quarter of 2011, the Company had no significant assets or liabilities required to be measured at fair value on a nonrecurring basis as of either December 31, 2012 or 2011.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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Available-for-sale Securities [Abstract]

Securities Available For Sale

12 Months Ended

Dec. 31, 2012

Securities Available For Sale

The Company’s securities available for sale consist of auction rate securities, which represent i) interests in pools of student loans guaranteed by the U.S. government under the Federal Family Education Loan Program and ii) a structured finance security. The structured finance security has an attached credit default swap under which the principal value of the structured finance security would be partially or fully forfeited at net default rates on the underlying corporate debt obligations ranging from 8% to 9%. The net default rate as of December 31, 2012 was estimated to be 6.22%. The structured finance security is fully collateralized by investment grade credit-linked notes made up of floating rate international bank notes, which are alternatively available to cover potential claims under the credit default swap in case of forfeiture.

Due to liquidity issues in the auction rate securities market, there was insufficient observable market data to determine the fair values of the Company’s auction rate securities as of December 31, 2012 or 2011. Therefore, their respective fair values were estimated by an independent valuation firm, Houlihan Capital Advisors, LLC, using a probability weighted discounted cash flow model. The valuation of these securities is sensitive to market conditions and management’s judgment and can change significantly based on the assumptions used. The following tables set forth the fair values of the Company’s auction rate securities by type of security and underlying credit rating as of the dates indicated (in millions):



	Underlying Credit Rating (1)
As of December 31, 2012	AA-		BB		CCC		Total
Student loans	$	9.1	$	2.6	$	—	$	11.7
Structured finance securities	—		—		2.7		$	2.7
Total auction rate securities	$	9.1	$	2.6	$	2.7	$	14.4



	Underlying Credit Rating (1)
As of December 31, 2011	AAA		CCC		Total
Student loans	$	11.9	$	—	$	11.9
Structured finance securities	—		1.7		$	1.7
Total auction rate securities	$	11.9	$	1.7	$	13.6


(1)	The Company’s auction rate securities maintain split ratings. For purposes of this table, securities are categorized according to their lowest rating.

As of December 31, 2012, the yields on the Company’s auction-rate securities ranged from 1.68% to 2.37%. These yields represent the predetermined “maximum” reset rates that occur upon auction failures according to the specific terms within each security’s governing documents. The issuers have been making interest payments when due. Total interest earned for the years ended December 31, 2012, 2011 and 2010 was $0.4 million, $0.4 million and $0.7 million, respectively.

Structured Finance Auction Rate Securities

The Company’s structured finance security, for which cumulative credit losses of $3.3 million have been recognized through December 31, 2012, had a par value of $5.0 million and a cost basis of $1.7 million as of December 31, 2012. If unrealized losses are believed to be other-than-temporary, an impairment charge is recorded. Following the sale of two of the Company’s structured finance securities as discussed below, management determined that it no longer met the criteria for intent to hold with respect to its remaining structured finance security. Accordingly, declines in this security’s cost basis are recognized in earnings. Increases are recorded in other comprehensive income, net of applicable income taxes. Unrealized gains associated with the Company's structured finance security totaled $1.0 million as of December 31, 2012.

No other than temporary impairment losses were recognized in connection with the Company’s structured finance securities during the year ended December 31, 2012. Details of other than temporary impairment losses recognized for the periods indicated are as follows (in millions):



	For the Years Ended December 31,
	2011		2010
Total other-than-temporary impairment losses on securities available for sale	$	0.6	$	1.2
Less: Unrealized losses on securities available for sale, recognized in other comprehensive income	—		—
Unrealized losses on securities available for sale, recognized in earnings	$	0.6	$	1.2

In 2010, the Company sold two of its three structured finance auction rate securities for $7.0 million. The sold securities had a cost basis of $6.6 million, with cumulative credit losses of $4.6 million recognized in prior periods. The cumulative credit losses were partially offset by a realized gain of $0.4 million on the sale transaction, for a cumulative net realized loss of $4.2 million on disposal. Details of the securities sold, as of the date of sale, are as follows (in millions):



Par value	$	11.2
Cost basis	$	6.6
Fair value	$	5.7
Cumulative realized losses	$	4.2
Accumulated losses in other comprehensive income, net of tax	$	0.6

Student Loan Auction Rate Securities

In the second quarter of 2011, the issuer of one of the Company’s student loan auction rate securities redeemed its security at its par value of $4.6 million. In connection with the redemption, $0.5 million of cumulative unrealized losses, and the corresponding tax impact of $0.2 million, were eliminated from other comprehensive income. Management believes the temporary unrealized decline in estimated fair value as of December 31, 2012 associated with its remaining student loan auction rate securities is primarily attributable to the limited liquidity of these investments and overall market volatility. The Company expects to recover the remaining cost basis of its student loan auction rate securities, and does not intend to sell, or believe that it will more likely than not be required to sell its student loan auction rate securities before recovery of their cost basis, which may be at maturity. Cumulative gross unrealized losses on the Company’s student loan auction rate securities totaled $1.2 million and $1.0 million as of December 31, 2012 and 2011, respectively, or $0.6 million net of applicable income taxes as of both December 31, 2012 and 2011, respectively, which were reflected as a component of other comprehensive income.

Auction Rate Securities – Reconciliation of Cost Basis to Fair Value

The Company's student loan auction rate securities have been in a continuous unrealized loss position for over twelve months. The cost basis, gross cumulative unrealized (losses) gains and estimated fair values of the Company’s auction rate securities as of the dates indicated were as follows (in millions):



	December 31, 2012
	Adjusted Cost Basis (1)		Gross Cumulative Unrealized (Losses)/Gains			Fair Value
Auction rate securities – student loans	$	12.9	$	(1.2	)	$	11.7
Auction rate securities – structured finance securities	1.7		1.0			2.7
Total auction rate securities	$	14.6	$	(0.2	)	$	14.4

	December 31, 2011
	Adjusted Cost Basis (1)		Gross Cumulative Unrealized (Losses) Gains			Fair Value
Auction rate securities – student loans	$	12.9	$	(1.0	)	$	11.9
Auction rate securities – structured finance securities	1.7		—			1.7
Total auction rate securities	$	14.6	$	(1.0	)	$	13.6


(1)	Adjusted cost basis reflects adjustments for credit and other losses recognized in earnings on our structured finance security. Cumulative adjustments to the cost basis of securities held as of both December 31, 2012 and 2011 totaled $3.3 million. Par value of securities held as of both December 31, 2012 and 2011 totaled $17.9 million.

As of December 31, 2012, contractual maturities of the Company’s student loan auction rate securities range from 15 to 35 years, and for the structured finance security, 4 years.

The entire disclosure for investments in certain debt and equity securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Accounts Receivable, Net of Allowance

Accounts Receivable, Net of Allowance

12 Months Ended

Dec. 31, 2012

Receivables [Abstract]

Accounts receivable, net of allowance, which is classified as current, is composed of the following as of the dates indicated (in millions):



	December 31,
	2012			2011
Contract billings	$	522.0		$	395.7
Retainage	113.5			41.7
Costs and earnings in excess of billings	252.8			228.7
Accounts receivable, gross	$	888.3		$	666.1
Less allowance for doubtful accounts	(11.2		)	(7.6		)
Accounts receivable, net	$	877.1		$	658.5

Retainage, which has been billed, but is not due until completion of performance and acceptance by customers, is generally expected to be collected within one year. Receivables expected to be collected beyond one year are recorded in other long-term assets. The Company maintains an allowance for doubtful accounts for estimated losses, both for specific customers and as a reserve against other balances, resulting from the inability of customers to make required payments. Amounts charged against the allowance primarily represent the write-off of accounts which had been fully reserved previously. Activity in the allowance for doubtful accounts for our continuing operations business for the periods indicated is as follows (in millions):



	Years Ended December 31,
	2012			2011
Allowance for doubtful accounts at beginning of year	$	7.6		$	8.3
Provision for doubtful accounts	6.9			2.0
Amounts charged against the allowance	(3.3		)	(2.7		)
Allowance for doubtful accounts at end of year	$	11.2		$	7.6

The Company has trade receivables for certain “pay-when-paid” projects, which provide for payment through September 2016. These receivables, which are included within assets of discontinued operations in the consolidated financial statements, have been recorded at their respective net present values, with the non-current portion recorded within long-term assets of discontinued operations. Imputed interest is recognized as interest income as earned, and is reflected within the results of operations from discontinued operations. As of December 31, 2012 and 2011, $6.3 million and $6.8 million were outstanding, respectively, with $4.3 million and $4.8 million, respectively, recorded in long-term assets of discontinued operations.

Certain of the Company’s international subsidiaries included within discontinued operations utilized the factoring of accounts receivable as short-term financing mechanisms. The amount of related receivables sold during the periods ended, or outstanding as of both December 31, 2012 and 2011, was not material.

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

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-Subparagraph (SX 210.4-08.(k))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 01-6
-Paragraph 13
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3, 4
-Article 5

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 7
-Article 9

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph k
-Article 4

Long-term Debt, Unclassified [Abstract]

Debt

12 Months Ended

Dec. 31, 2012

Debt

The carrying value of debt is composed of the following as of the dates indicated (in millions):



		December 31,
Description	Maturity Date	2012			2011
Credit facility	August 22, 2016	$	134.0		$	60.0
7.625% senior notes	February 1, 2017	150.0			150.0
New 4.0% Notes, $105.3 million principal amount	June 15, 2014	100.9			98.2
New 4.25% Notes, $97.0 million principal amount	December 15, 2014	92.1			89.9
Original 4.0% Notes	June 15, 2014	9.7			9.7
Original 4.25% Notes	December 15, 2014	3.0			3.0
Capital lease obligations, weighted average interest rate of 2.9%	In installments through June 2019	79.0			40.6
Notes payable for equipment, weighted average interest rate of 4.0%	In installments through May 2018	30.2			43.4
Total debt		$	598.9		$	494.8
Less current maturities		(52.6		)	(34.1		)
Long-term debt		$	546.3		$	460.7

Credit Facility

In August 2011, the Company entered into an amendment to its previous credit facility, which amended and restated the Company’s previous credit facility in its entirety, expanded maximum available borrowing capacity from $260 million to $600 million and extended the maturity date from May 2013 until August 2016. The amended Credit Facility allows the Company to borrow up to the full $600 million of availability, provided that the Company is in compliance with all of the terms and provisions of the Credit Facility.

The Credit Facility provides for a $600 million senior secured revolving credit facility maturing on August 22, 2016. Up to $350 million of the Credit Facility is available for the issuance of letters of credit. Subject to certain terms in the Credit Facility, the Company has the option to increase its revolving commitments and/or establish term loans of up to $200 million in total. Borrowings under the Credit Facility will be used to refinance existing indebtedness and for working capital, capital expenditures and other corporate purposes, including the repurchase or prepayment of indebtedness; however, the Credit Facility restricts the repurchase or prepayment of certain unsecured indebtedness, including the Company’s senior notes due 2017 and senior convertible notes due 2014, unless the Company has at least $50 million of remaining liquidity (as defined in the Credit Facility) after any such repurchase or prepayment.

The Credit Facility requires that the Company maintain a consolidated leverage ratio (as defined in the Credit Facility) at or below 3.50 to 1.00 and a consolidated interest coverage ratio (as defined in the Credit Facility) at or above 3.00 to 1.00. Subject to customary exceptions, the Credit Facility also limits the Company’s ability to engage in certain activities, including acquisitions, mergers and consolidations, debt incurrence, investments, capital expenditures, asset sales, debt prepayments, lien incurrence and the making of distributions on or repurchases of capital stock.

Amounts borrowed under the Credit Facility will bear interest, at the Company’s option, at a rate equal to either (a) the eurocurrency rate (as defined in the Credit Facility), plus a margin of 1.50% to 2.50%, as determined based on the Company’s consolidated leverage ratio (as defined in the Credit Facility) as of the most recent fiscal quarter, or (b) the base rate, which is equal to the highest of (i) the federal funds rate (as defined in the Credit Facility) plus 0.5%, (ii) Bank of America’s prime rate and (iii) the eurocurrency rate plus 1.00%, plus a margin of 0.50% to 1.50%, as determined based on the Company’s consolidated leverage ratio as of the most recent fiscal quarter. Financial standby letters of credit and commercial letters of credit issued under the Credit Facility are subject to a letter of credit fee of 1.50% to 2.50% and performance standby letters of credit are subject to a letter of credit fee of 0.75% to 1.25% in each case, based on the Company’s consolidated leverage ratio as of the most recent fiscal quarter. The Company must also pay a commitment fee to the lenders on any unused availability under the Credit Facility, which is equal to 0.25% to 0.45%, based on the Company’s consolidated leverage ratio as of the then most recent fiscal quarter.

As of December 31, 2012, the Company had outstanding revolving loans of $134.0 million and approximately $120.8 million of letters of credit issued under the Credit Facility. The remaining $345.2 million of Credit Facility borrowing capacity as of December 31, 2012 was available for revolving loans or up to $229.2 million of new letters of credit. As of December 31, 2011, the Company had outstanding revolving loans of $60.0 million and approximately $90.0 million of letters of credit issued under the Credit Facility. Outstanding letters of credit mature at various dates and most have automatic renewal provisions, subject to prior notice of cancellation. As of December 31, 2012 and 2011, interest on outstanding revolving loans accrued at a rate of approximately 3.95% and 2.94% per annum, respectively. As of both December 31, 2012 and 2011, interest on outstanding letters of credit accrued at either 1% or 2% per annum, based on the type of letter of credit issued, as described above. The unused facility fee as of both December 31, 2012 and 2011 was 0.35%.

The Credit Facility is guaranteed by certain of the Company’s 100%-owned direct and indirect domestic subsidiaries. It is collateralized by a first priority security interest in substantially all of the Company’s assets and the assets of its wholly-owned subsidiaries, as well as a pledge of the outstanding equity interests in certain of the Company’s operating subsidiaries. The Credit Facility also provides for customary events of default and contains cross-default provisions with the Company’s other significant debt instruments, including the Company’s indemnity agreement with its surety provider, as well as customary remedies upon an event of default (as defined in the Credit Facility), including the acceleration of repayment of outstanding amounts and other remedies with respect to the collateral securing the Credit Facility obligations.

Senior Convertible Notes

New Senior Convertible Notes. During the first quarter of 2011, the Company exchanged $105.3 million of its Original 4.0% Notes and $97.0 million of its Original 4.25% Notes for identical principal amounts of New 4.0% Notes and New 4.25% Notes, respectively, for an exchange fee of approximately 50 basis points, or 0.5%, of the aggregate principal amount of the notes exchanged. The terms of the New Convertible Notes are substantially identical to those of the Original Convertible Notes, except that the New Convertible Notes have an optional physical (share), cash or combination settlement feature and contain certain conditional conversion features. Exchange fees of approximately $1.0 million will be recognized over the remaining life of the New Convertible Notes as interest expense. Transaction costs of approximately $0.7 million were recognized within general and administrative expenses beginning in 2010 through March 31, 2011. During 2011, an immaterial principal amount of Original Convertible Notes was converted into shares of the Company’s common stock.

The New Convertible Notes are convertible at any time during the three months immediately preceding their respective maturity dates; prior to such time, however, the New Convertible Notes are convertible only if one of the following three conditions is satisfied:

(i)

if the last reported sale price of the Company’s common stock is greater than or equal to 130% of the applicable conversion price of the New Convertible Notes during at least 20 of the last 30 consecutive trading days ending on and including the last trading day of a calendar quarter, then the applicable New Convertible Notes may be converted during the immediately following calendar quarter (and only during such calendar quarter);

(ii)

if after any five consecutive trading-day period in which the trading price per $1,000 principal amount of New Convertible Notes for each trading day during such period was less than 98% of the product of the last reported sale price of the Company’s common stock and the applicable conversion rate, then the applicable New Convertible Notes may be converted during the immediately following five business day period; or

(iii)

if the Company effects certain distributions to its shareholders or if the Company is party to a consolidation, merger, binding share exchange, or a sale, transfer, lease or other conveyance of all or substantially all of its assets, pursuant to which the Company’s common stock would be converted into or exchanged for, or would constitute solely the right to receive, cash, securities or other assets, or in the case of certain other fundamental changes, then the New Convertible Notes may be converted during the period that is 45 trading days prior to the ex-dividend date or the initial anticipated effective date of the transaction, as applicable.

The Company has divided the principal balance of the New Convertible Notes between the fair value of the debt component and the fair value of the common stock conversion feature. Using an income approach, management discounted the values of the New Convertible Notes at an estimated rate of 6.73%, which represents the estimated market interest rate for a similar nonconvertible instrument as of the date of the exchange. The resulting total debt discount of $17.4 million for the New Convertible Notes will be accreted to interest expense over the remaining terms of the New Convertible Notes. This will increase interest expense during the term of the New Convertible Notes above their 4.0% and 4.25% cash coupon interest rates to an effective interest rate of 6.73%. As of December 31, 2012, the remaining period of amortization associated with the debt discount and related financing costs was approximately 2 years. The fair value of the common stock conversion feature is recorded as a component of shareholders’ equity.

The carrying values of the debt and equity components of the New Notes as of the dates indicated are as follows (in millions):



	December 31, 2012						December 31, 2011
	New 4.0% Senior Convertible Notes			New 4.25% Senior Convertible Notes			New 4.0% Senior Convertible Notes			New 4.25% Senior Convertible Notes
Principal amount	$	105.3		$	97.0		$	105.3		$	97.0
Unamortized debt discount and financing costs	(4.4		)	(4.9		)	(7.1		)	(7.1		)
Net carrying amount of debt component	$	100.9		$	92.1		$	98.2		$	89.9
Carrying amount of equity component	$	8.9		$	8.5		$	8.9		$	8.5

The New Convertible Notes are guaranteed by the Company’s subsidiaries that guarantee the Original Convertible Notes.

Original Senior Convertible Notes. In November 2009, the Company issued $100 million of Original 4.25% Notes due December 15, 2014 in a private placement. Of this amount, $97.0 million was canceled and exchanged in the first quarter of 2011 for a like principal amount of New 4.25% Notes in connection with our debt exchange as discussed above. The Original 4.25% Notes bear interest at a rate of 4.25% per year, payable semi-annually in arrears, on June 15 and December 15 of each year. On or prior to December 12, 2014, holders may convert their Original 4.25% Notes into shares of MasTec common stock at an initial conversion rate of 64.6162 shares of MasTec common stock per $1,000 principal amount of Original 4.25% Notes, which represents an initial conversion price of approximately $15.48 per share, subject to customary anti-dilution adjustment terms for these types of notes. Approximately $3.7 million in financing costs were incurred in connection with the issuance of the Original 4.25% Notes. These deferred financing costs are included in other assets in the consolidated balance sheet and are being amortized over the term of the Original 4.25% Notes.

In June 2009, the Company issued $115 million of Original 4.0% Notes due June 15, 2014 in a registered offering. Of this amount, $105.3 million was canceled and exchanged in the first quarter of 2011 for a like principal amount of New 4.0% Notes in connection with our debt exchange as discussed above. The Original 4.0% Notes bear interest at a rate of 4.0% per year, payable semi-annually in arrears, on June 15 and December 15 of each year. On or prior to June 13, 2014, holders may convert their Original 4.0% Notes into shares of MasTec common stock at an initial conversion rate of 63.4417 shares of MasTec common stock per $1,000 principal amount of Original 4.0% Notes, which represents an initial conversion price of approximately $15.76 per share, subject to customary anti-dilution adjustment terms for these types of notes. Approximately $5.4 million in financing costs were incurred in connection with the issuance of the Original 4.0% Notes, which are included in other assets in the consolidated balance sheet and are being amortized over the term of the Original 4.0% Notes.

The 4.25% and 4.0% senior convertible notes are guaranteed by certain of the Company's 100%-owned direct and indirect domestic operating subsidiaries. There are no financial covenants on these notes, however, there are certain nonfinancial provisions and covenants associated with these notes.

As of December 31, 2012, an aggregate principal amount of $12.7 million of Original Convertible Notes was outstanding.

Senior Notes

The Company has $150 million of outstanding 7.625% senior notes due February 2017, with interest due semi-annually. The Senior Notes contain default (including cross-default) provisions and covenants restricting many of the same transactions as under the Company’s Credit Facility. The indenture that governs the Senior Notes allows the Company to incur additional indebtedness to the extent that the Company’s fixed charge coverage ratio, as therein defined, is at least 2:1. The fixed charge coverage ratio is calculated as consolidated EBITDA for the most recent four fiscal quarters for which internal financial statements are available, divided by fixed charges for such four quarter period, as such terms are defined in the indenture. If the fixed charge coverage ratio is less than 2:1, the Company is still permitted to incur the following additional indebtedness, among others: credit facilities under a defined threshold, renewals to existing debt permitted under the indenture, capital lease obligations up to 5% of the Company’s consolidated net assets, plus an additional $50 million of indebtedness at any time the Senior Notes remain outstanding. The Senior Notes are guaranteed by certain of the Company’s operating subsidiaries.

Acquisition Debt

In connection with certain acquisitions, the Company has entered into or assumed certain debt and/or capital lease obligations. As of December 31, 2012 and 2011, $20.6 million and $29.9 million, respectively, of this acquisition-related debt remained outstanding. Except for one note with an immaterial principal balance as of December 31, 2012, there are no financial covenants associated with this acquisition-related debt.

Debt Guarantees and Covenants

The Company’s Senior Notes, New Convertible Notes and Original Convertible Notes are fully and unconditionally guaranteed on an unsecured, unsubordinated, joint and several basis by certain of the Company's existing and future 100%-owned direct and indirect domestic subsidiaries that are guarantors of the Company's Credit Facility or other outstanding indebtedness. See supplemental financial information in Note 21 - Supplemental Guarantor Financial Information.

MasTec was in compliance with all provisions and covenants pertaining to its outstanding debt instruments as of December 31, 2012 and 2011.

Contractual Maturities of Debt Obligations

Contractual maturities of MasTec’s debt and capital lease obligations as of December 31, 2012 were as follows (in millions):



2013	$	52.6
2014	233.9
2015	18.4
2016	141.6
2017	152.0
Thereafter	0.4
Total	$	598.9

See Note 11 – Lease Obligations for additional information.

Interest Expense, Net

Details of interest expense, net, classified within continuing operations for the periods indicated is as follows (in millions):



	Year Ended December 31,
	2012			2011			2010
Interest expense:
Contractual and other interest expense	$	27.5		$	26.1		$	26.6
Accretion of senior convertible note discount	4.9			4.2			—
Deferred financing costs and commitment fees	5.4			4.7			3.6
Total interest expense	$	37.8		$	35.0		$	30.2
Interest income	(0.4		)	(0.5		)	(1.0		)
Interest expense, net	$	37.4		$	34.5		$	29.2

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

12 Months Ended

Dec. 31, 2012

Property and Equipment, Net

Property and equipment, net, including property and equipment held under capital leases, is composed of the following as of the dates indicated (in millions):



	December 31,
	2012			2011			Estimated Useful Lives (In Years)
Land	$	4.8		$	4.7
Buildings and leasehold improvements	15.4			12.5			5 – 40
Machinery and equipment	518.3			381.6			2 – 15
Office furniture and equipment	92.8			76.9			3 – 7
Total property and equipment	$	631.3		$	475.7
Less accumulated depreciation	(280.9		)	(212.7		)
Property and equipment, net	$	350.4		$	263.0

Depreciation expense from continuing operations for the years ended December 31, 2012, 2011 and 2010 was $79.8 million, $60.2 million and $44.0 million, respectively.

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

Lease Obligations

12 Months Ended

Dec. 31, 2012

Leases [Abstract]

Lease Obligations

Capital Leases

MasTec enters into agreements that provide financing for various machinery and equipment that expire on various dates. Leases meeting certain criteria are capitalized, with the related asset being recorded in property and equipment and an offsetting amount recorded as a liability. Capital lease additions are reflected in the consolidated statements of cash flows within the supplemental disclosures of non-cash information. Assets held under capital lease totaled $102.2 million and $27.7 million as of December 31, 2012 and 2011, respectively.

In January 2011, the Company modified the terms of certain of its equipment operating leases. These modifications led to a change in the classification of the corresponding leases from operating to capital as of the effective date of the lease modifications. Accordingly, $23.4 million of capital lease assets and corresponding capital lease obligations were recorded in the Company’s consolidated balance sheet as of January 1, 2011.

Operating Leases

In the ordinary course of business, the Company enters into non-cancelable operating leases for certain of its facility, vehicle and equipment needs, including related party leases. These leases allow the Company to conserve cash and provide flexibility in that the Company pays a monthly rental fee for the use of related facilities, vehicles and equipment rather than purchasing them. The terms of these agreements vary from lease to lease, including some with renewal options and escalation clauses. The Company may decide to cancel or terminate a lease before the end of its term, in which case the Company is typically liable for the remaining lease payments under the term of the lease. For operating leases with purchase options, the option to purchase equipment is at estimated fair market value. Rent expense relating to operating leases, including short term rentals, reflected within continuing operations, was approximately $222.5 million, $168.8 million and $129.3 million for the years ended December 31, 2012, 2011 and 2010, respectively.

Future Lease Commitments

Minimum future lease commitments under capital leases and non-cancelable operating leases, including the effect of escalation clauses in effect as of December 31, 2012, were as follows (in millions):



	Capital Leases			Operating Leases
2013	$	31.2		$	37.2
2014	21.5			23.4
2015	16.5			14.6
2016	9.0			7.0
2017	3.6			4.0
Thereafter	0.4			0.8
Total minimum lease payments	$	82.2		$	87.0
Less amounts representing interest	(3.2		)
Total capital lease obligations, net of interest	$	79.0
Less current portion	(31.0		)
Long term portion of capital lease obligations, net of interest	$	48.0

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

Stock-Based Compensation and Other Employee Benefit Plans

Stock-Based Compensation and Other Employee Benefit Plans

12 Months Ended

Dec. 31, 2012

Share-based Compensation [Abstract]

The Company has certain stock-based compensation plans with stock options and restricted share awards outstanding as of December 31, 2012: the 2003 Employee Stock Incentive Plan, as amended; the Amended and Restated 2003 Stock Incentive Plan for Non-Employees, as amended; and individual option and restricted stock agreements. The Directors’ Plan expired in 2004 and no future stock options can be granted under this plan. In addition, the MasTec, Inc. 2011 Employee Stock Purchase Plan (the “2011 ESPP”) replaced the 1997 Non-Qualified Employee Stock Purchase Plan as of July 1, 2011. Under the 2011 ESPP, 1,000,000 shares of the Company’s common stock are available for purchase at a discount by eligible employees. Under plans currently in effect, there were a total of 3,947,895 shares available for grant as of December 31, 2012.

Restricted Share Awards

MasTec grants restricted share awards, which are valued based on the market price of MasTec common stock on the date of grant. Total unearned compensation related to restricted share awards as of December 31, 2012 was approximately $8.3 million, which is expected to be recognized over a weighted average period of approximately 2 years. The total intrinsic value, or fair value, of restricted share awards that vested, which is based on the market price on the date of vesting, was $7.3 million, $11.1 million and $1.2 million for the years ended December 31, 2012, 2011 and 2010, respectively.

Following is a summary of restricted share award activity during the years indicated:



	Restricted Shares		Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2010	1,009,777		$	9.32
Granted	364,784		17.06
Vested	(646,531	)	8.00
Canceled/forfeited	(11,250	)	9.80
Non-vested restricted shares, as of December 31, 2011	716,780		$	14.45
Granted	397,623		21.22
Vested	(347,889	)	12.68
Canceled/forfeited	(11,500	)	15.02
Non-vested restricted shares, as of December 31, 2012	755,014		$	18.82

Stock Options

The Company has granted options to purchase its common stock to employees and members of the Board of Directors and affiliates under various stock option plans at not less than the fair market value of the underlying stock on the date of grant. No stock options have been granted since 2006.

The following is a summary of stock option activity during the years indicated:



	Stock Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value ⁽¹⁾ (in millions)
Options outstanding as of December 31, 2010	2,588,170		$	10.27	3.87	$	11.2
Exercised	(1,132,396	)	10.25
Canceled/forfeited	(10,000	)	13.95
Options outstanding as of December 31, 2011	1,445,774		$	10.25	3.16	$	10.3
Options exercisable as of December 31, 2011	1,445,774		$	10.25	3.16	$	10.3

Options outstanding as of December 31, 2011	1,445,774		$	10.25	3.16	$	10.3
Exercised	(391,949	)	9.46
Canceled/forfeited	—		—
Options outstanding as of December 31, 2012	1,053,825		$	10.55	2.31	$	15.2
Options exercisable as of December 31, 2012	1,053,825		$	10.55	2.31	$	15.2


⁽¹⁾	Amount represents the difference between the exercise price and the market price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.

All outstanding stock options were fully vested as of December 31, 2011. The total intrinsic value of options exercised during the years ended December 31, 2012, 2011 and 2010, which is based on the difference between the exercise price and the market price of the Company’s stock at the date of exercise, was $5.1 million, $10.3 million and $0.8 million, respectively. Proceeds from options exercised during the years ended December 31, 2012, 2011 and 2010, totaled $3.7 million, $11.6 million and $2.6 million, respectively.

Stock Based Compensation Expense and Related Tax Benefit

Details of stock based compensation expense and related tax benefits for the periods indicated are as follows (in millions):



	Years Ended December 31,
	2012		2011		2010
Stock based compensation expense:
Restricted share awards	$	4.4	$	3.6	$	3.8
Stock options	—		—		0.1
Total stock based compensation expense	$	4.4	$	3.6	$	3.9
Income tax benefit from stock based compensation:
Restricted share awards	$	1.8	$	3.4	$	1.3
Stock options	0.7		2.9		(0.3		)
Total income tax benefit from stock based compensation	$	2.5	$	6.3	$	1.0
Excess tax benefit from stock based compensation:
Vested restricted shares ⁽¹⁾	$	0.1	$	2.1	$	—
Stock options exercised ⁽¹⁾	0.7		5.7		—
Total excess tax benefit from stock based compensation ⁽¹⁾	$	0.8	$	7.8	$	—


⁽¹⁾	Excess tax benefits, which represent cash flows from tax deductions in excess of compensation expense recognized for stock options exercised and vested restricted shares, are classified as financing cash flows in the Company’s consolidated statements of cash flows.

401(k) Plan. MasTec has a 401(k) plan covering all eligible employees. Subject to certain dollar limits, eligible employees may contribute up to 75% of their pre-tax annual compensation to the 401(k) plan. Effective January 1, 2011, MasTec increased its 100% match of employee contributions from 1% to 2.5% of the employee’s salary, capped at $2,500 per employee. Effective January 1, 2011, matching contributions are payable annually, 50% in shares of MasTec common stock and 50% in cash. During the years ended December 31, 2012, 2011 and 2010, matching contributions totaled approximately $2.1 million, $1.7 million and $0.8 million, respectively.

Deferred Compensation Plan. MasTec offers a deferred compensation plan to its highly compensated employees. These employees are allowed to contribute a percentage of their pre-tax annual compensation to the deferred compensation plan. Effective January 1, 2011, MasTec increased its 100% match of employee contributions from 1% to 2.5% of the employee’s salary, capped at $2,500 per employee. Effective January 1, 2011, matching contributions are payable annually. Currently, management intends to provide for matching contributions in cash, however, matching contributions can also be provided for 50% in shares of MasTec common stock and 50% in cash, at MasTec’s election. Deferred compensation plan assets and related liabilities of approximately $3.2 million and $3.3 million are included in other long-term assets and other long-term liabilities, respectively, as of December 31, 2012. As of December 31, 2011, deferred compensation plan assets and related liabilities totaled $2.6 million and $2.2 million, respectively.

Employee Stock Purchase Plan. The 2011 ESPP became effective on July 1, 2011. Under the 2011 ESPP, eligible employees can purchase MasTec, Inc. common stock at a 15% discount through after-tax payroll deductions, allocating from 1% to 15% of their compensation each pay period. Eligible employees can also make lump sum purchases. Stock purchases under the 2011 ESPP are subject to a quarterly maximum of 5,000 shares per employee, and on an annual basis, the value of stock purchased cannot exceed $25,000 per employee.

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Other Retirement Plans

12 Months Ended

Dec. 31, 2012

Multiemployer Plans [Abstract]

Other Retirement Plans

Multi-Employer Pension Plans. Certain of MasTec’s subsidiaries contribute amounts to multi-employer pension and other multi-employer benefit plans and trusts. Multi-employer plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls. Union payrolls cannot be determined for future periods because the number of union employees employed at any given time, and the plans in which they may participate, vary depending upon the location and number of ongoing projects at a given time and the need for union resources in connection with those projects.

ASU 2011-09, Compensation–Retirement Benefits–Multiemployer Plans (Subtopic 715-80): Disclosures about an Employer’s Participation in a Multiemployer Plan (“ASU 2011-09”) requires disclosure about an employer’s participation in multi-employer pension plans. Required disclosures include significant pension plans in which companies participate, level of participation, and financial health and nature of commitments to such plans. The Pension Protection Plan (“PPA”) of 2006 was enacted as part of a comprehensive funding reform effort for multi-employer pension plans. The PPA further defined the funding rules for defined benefit pension plans and instituted certain requirements that were designed to identify and address financial problems associated with such plans. The PPA of 2006 created new funding classifications for multi-employer pension plans. Under the PPA, plans are classified as one of the following four colors based on the plan’s financial status;


Green (Safe):	A plan is generally in “safe” status if it is more than 80% funded.

Yellow (Endangered): A plan is generally in “endangered” status if its funded percentage is less than 80%, or if it has an accumulated funding deficiency for the current plan year or is projected to have an accumulated funding deficiency for any of the next six plan years.

Orange (Seriously Endangered): A “seriously endangered” plan generally has a funded percentage of 70% or less.


	Red (Critical): A plan is generally in “critical” status if its funded percentage is less than 65% and it is not projected to improve its funded percentage over the next seven years; or, if a funding deficiency in excess of specified amounts is expected in the foreseeable future.

A multi-employer plan that is so underfunded as to be in “endangered” or “critical” status is required to adopt a funding improvement plan (“FIP”) or a rehabilitation plan (“RP”), which, among other actions, could include decreased benefits and increased contributions. These actions are intended to improve their funding status over a period of years. If a pension fund is in critical status, a participating employer must pay an automatic surcharge in addition to contributions otherwise required under the collective bargaining agreement (“CBA”). With some exceptions, the surcharge is equal to 5% of required contributions for the initial critical year, and 10% for each succeeding plan year in which the plan remains in critical status. The surcharge ceases on the effective date of a CBA (or other agreement) that includes contribution and benefit terms consistent with the rehabilitation plan.

Required disclosures under ASU-2011-09, on a by-plan basis, include: amounts contributed; if plans are subject to surcharges; expiration date of related CBAs; employer and plan identification number (“EIN/Pension Plan Number”); PPA zone status; if extended amortization provisions, which provide certain plans with extensions of time to amortize pension funding shortfalls, have been utilized; the existence, and status of, any FIPs or RPs; and any plans to which companies have contributed greater than 5% of the plan’s total contributions.

Details of significant pension funds for the periods, and as of the dates indicated, based upon the information available to the Company from plan administrators as of December 31, 2012, are provided in the following table. Note that the table below may contain slight summation differences due to rounding.



	Company Contributions For the Years Ended December 31, (in millions)						Contributions Greater than 5% of Total Plan Contributions	Surcharge
Multi-employer Pension Plan	2012		2011		2010		Contributions Greater than 5% of Total Plan Contributions	Surcharge	Expiration Date of CBA
Pipeline Industry Pension Fund	$	8.9	$	6.2	$	10.3	Yes	No	05/31/2014
Central Pension Fund of the International Union of Operating Engineers and Participating Employers	6.0		4.4		4.9		No	No	01/31/2014
Laborers National Pension Fund	1.5		0.5		0.2		No	No	01/31/2014
Teamsters National Pipeline Pension Fund	1.4		—		—		(a)	(a)	01/31/2014
Eighth District Electrical Pension Fund	1.2		0.5		—		No	No	02/28/2013
West Virginia Laborers Pension Trust Fund	0.9		0.4		—		No	No	01/31/2014
Michigan Laborers Pension Fund	0.9		0.2		0.2		No	No	01/31/2014
Operating Engineers Local 324 Pension Fund	0.8		—		—		No	No	01/31/2014
New England Electrical Workers Money Purchase Plan and Trust (c) (d)	0.7		0.7		0.5		NA	NA	08/30/2012
Laborers Local Union No. 158 Pension Fund	0.6		0.7		0.4		Yes	No	01/31/2014
Laborers District Council of Western Pennsylvania Pension Fund	0.6		0.3		0.2		No	No	01/31/2014
International Brotherhood of Electrical Workers Local 1249 Pension Plan	0.6		0.3		—		No	No	05/05/2013
International Union of Operating Engineers Local 132 Pension Fund	0.5		0.3		—		No	No	01/31/2014
Operating Engineers Construction Industry and Miscellaneous Pension Fund	0.5		0.1		0.2		No	No	01/31/2014
International Union of Operating Engineers Pension Fund of Eastern Pennsylvania and Delaware	0.5		0.5		0.3		No	No	01/31/2014
Minnesota Laborers Pension Fund	0.4		0.3		1.0		No	No	01/31/2014
National Electrical Benefit Fund	0.3		0.2		0.2		No	No	05/05/2013
Southwestern Pennsylvania and Western Maryland Teamsters and Employers Pension Fund	0.3		0.1		—		No	No	01/31/2014
National Electrical Annuity Plan (c)	0.3		0.3		0.4		NA	NA	09/05/2015
Laborers Pension Trust Fund for Northern Nevada	0.2		0.8		0.4		NA	No	01/31/2014
Operating Engineers Pension Trust Fund	—		1.2		1.0		No	No	01/31/2014
Central States, Southeast and Southwest Areas Pension Plan (b)	—		0.9		0.8		No	No	01/31/2014
Western Conference of Teamsters Pension Plan	—		0.4		0.3		No	No	01/31/2014
Other funds	2.1		1.5		1.4
Total contributions	$	29.1	$	20.7	$	22.6


(a)	Information not available as of December 31, 2012. The Teamsters National Pipeline Pension Fund was established in 2012.


(b)	The Company’s subsidiary that participated in the Central States, Southeast and Southwest Areas Pension Plan voluntarily withdrew from this plan in November 2011. See additional discussion below and in Note 17 – Commitment and Contingencies.


(c)	These plans are defined contribution multi-employer pension plans; therefore, PPA zone status disclosures in table below are not applicable.


(d)	The collective bargaining agreement associated with the New England Electrical Workers Money Purchase Plan is under negotiation as of December 31, 2012.

Pension Protection Act Zone Status

Multi-employer Pension Plan

EIN

Pension Plan Number

2012

As of

2011

As of

Extended

Amortization

Utilized

FIP/RP Status

Pipeline Industry Pension Fund

736146433

001

Green

12/31/2011

Green

12/31/2010

Central Pension Fund of the International Union of Operating Engineers and Participating Employers

366052390

001

Green

01/31/2012

Green

01/31/2011

Laborers National Pension Fund

751280827

001

Green

12/31/2011

Green

12/31/2010

Teamsters National Pipeline Pension Fund

461102851

001

(a)

Eighth District Electrical Pension Fund

846100393

001

Green

03/31/2012

Green

03/31/2011

Yes

Implemented

West Virginia Laborers Pension Trust Fund

556026775

001

Green

03/31/2012

Green

03/31/2011

Michigan Laborers Pension Fund

386233976

001

Green

8/31/2012

Yellow

08/31/2011

Yes

Operating Engineers Local 324 Pension Fund

381900637

001

Red

04/30/2012

Red

04/30/2011

Implemented

Laborers Local Union No. 158 Pension Fund

236580323

001

Green

12/31/2011

Green

12/31/2010

Laborers District Council of Western Pennsylvania Pension Fund

256135576

001

Red

12/31/2012

Yellow

12/31/2011

Implemented

International Brotherhood of Electrical Workers Local 1249 Pension Plan

156035161

001

Red

12/31/2011

Red

12/31/2010

Implemented

International Union of Operating Engineers Local 132 Pension Fund

556015364

001

Green

03/31/2012

Green

03/31/2011

Operating Engineers Construction Industry and Miscellaneous Pension Fund

256135579

001

Green

12/31/2011

Yellow

12/31/2010

Yes

Implemented

International Union of Operating Engineers Pension Fund of Eastern Pennsylvania and Delaware

236405239

001

Red

12/31/2012

Green

12/31/2011

Pending

Minnesota Laborers Pension Fund

416159599

001

Green

12/31/2011

Green

12/31/2010

National Electrical Benefit Fund

530181657

001

Green

12/31/2011

Green

12/31/2010

Southwestern Pennsylvania and Western Maryland Teamsters and Employers Pension Fund

251046087

001

Red

06/30/2012

Red

06/30/2011

Implemented

Laborers Pension Trust Fund for Northern Nevada

880138600

001

Green

05/31/2012

Green

05/31/2011

Operating Engineers Pension Trust Fund

946090764

001

Orange

12/31/2011

Orange

12/31/2010

Implemented

Central States, Southeast and Southwest Areas Pension Plan (b)

366044243

001

Red

12/31/2011

Red

12/31/2010

Implemented

Western Conference of Teamsters Pension Plan

916145047

001

Green

12/31/2011

Green

12/31/2010


(a)	Information not available as of December 31, 2012. The Teamsters National Pipeline Pension Fund was established in 2012.


(b)	The Company’s subsidiary that participated in the Central States, Southeast and Southwest Areas Pension Plan voluntarily withdrew from this plan in November 2011. See additional discussion below and in Note 17 – Commitment and Contingencies.

The average number of employees covered under multi-employer plans in which the Company participates increased in 2011 due to the acquisition of EC Source. See Note 3 – Acquisitions and Other Investments. In addition, the number of union employees employed at any given time, and the plans in which they may participate, varies depending upon the location and number of ongoing projects at a given time and the need for union resources in connection with those projects.

Total contributions to multi-employer pension plans, and the related number of employees covered by these plans, for the periods indicated ranged as follows (dollars in millions):



	Number of Employees		Contributions to Multi-Employer Plans (in millions)
	Low	High	Pension		Post-Retirement Benefit		Total
2012	308	2,509	$	27.9	$	1.2	$	29.1
2011	308	1,538	$	19.4	$	1.3	$	20.7
2010	254	1,111	$	21.7	$	0.9	$	22.6

On November 15, 2011, the Company, along with other members of the Pipe Line Contractors Association (“PLCA”), voluntarily withdrew from the Central States Southeast and Southwest Areas Pension Fund (“Central States”), a defined benefit multi-employer pension plan. In connection with this withdrawal, the Company recorded a withdrawal liability of $6.4 million. The Company withdrew from the Central States Plan in order to mitigate its liability in connection with the plan, which is in critical status. The Company currently does not have plans to withdraw from any other multi-employer pension plan as of December 31, 2012.

See Note 17 – Commitments and Contingencies for additional information.

The entire disclosure for pension and other postretirement benefits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph q
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-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
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-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
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-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
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-Name FASB Staff Position (FSP)
-Number FAS106-2
-Paragraph 20, 21, 22
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-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]

Common Stock Activity

12 Months Ended

Dec. 31, 2012

Common Stock Activity

Treasury Stock and Share Activity

During the fourth quarter of 2011, the Company’s Board of Directors authorized a $150 million share repurchase plan, under which the Company repurchased 4.6 million shares of common stock for $75.0 million during the year ended December 31, 2011. During the second quarter of 2012, the Company repurchased an additional 2.9 million shares under this plan for an aggregate purchase price of $43.8 million. In July 2012, the Company repurchased an additional 2.0 million shares for an aggregate purchase price of $31.2 million, which completed the share repurchase plan. The repurchased shares are held in the Company’s treasury.

A summary of share activity for the periods indicated, which may contain slight summation differences due to rounding, is as follows (in thousands):



	Common Shares Outstanding		Treasury Shares
Balance as of December 31, 2010	78,215		—
Shares issued for stock option exercises	1,132
Shares issued for restricted stock awards	647
Other shares issued	39
Shares issued for acquisition of business	5,130
Common stock repurchases	(4,594	)	4,594
Balance as of December 31, 2011	80,569		4,594
Shares issued for stock option exercises	392
Shares issued for restricted stock awards	348
Other shares issued	13
Common stock repurchases	(4,874	)	4,874
Balance as of December 31, 2012	76,448		9,467

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 4
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section B
-Paragraph 7, 11A
-Chapter 1
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
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Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
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Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Income Taxes

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Income Taxes

The provision for income taxes from continuing operations for the periods indicated consists of the following (in millions):



	Year Ended December 31,
	2012			2011			2010
Current:
Federal	$	48.7		$	21.9		$	2.7
Foreign	0.3			0.1			—
State and local	12.4			1.3			3.3
	$	61.4		$	23.3		$	6.0
Deferred:
Federal	$	15.2		$	35.0		$	40.8
Foreign	1.1			(1.7		)	—
State and local, net of valuation provisions	(1.6		)	5.2			1.1
	$	14.7		$	38.5		$	41.9
Provision for income taxes	$	76.1		$	61.8		$	47.9

The benefit from income taxes from discontinued operations for the year ended December 31, 2012 was $4.5 million. The provision for income taxes from discontinued operations for the years ended December 31, 2011 and 2010 was $6.2 million and $15.6 million respectively.

The tax effects of significant items comprising the Company’s net deferred tax liability as of the dates indicated are as follows (in millions):



	2012			2011
Deferred tax assets:
Accrued self insurance	$	22.4		$	16.3
Operating loss carryforward	10.6			11.5
Compensation and benefits	8.3			12.3
Property and equipment	7.8			7.2
Bad debts	3.9			2.5
Other	9.9			9.0
Valuation allowance	(2.0		)	(2.8		)
Total deferred tax assets	$	60.9		$	56.0

Deferred tax liabilities:
Property and equipment	$	70.4		$	61.5
Goodwill	32.8			34.6
Other intangible assets	26.7			34.3
Gain on remeasurement of equity investee	11.1			11.1
Accounts receivable retainage	16.5			11.6
Other	19.5			14.9
Total deferred tax liabilities	$	177.0		$	168.0
Net deferred tax liabilities	$	(116.1	)	$	(112.0	)

Total net current and noncurrent deferred tax balances included in the Company’s consolidated balance sheets as of the dates indicated are as follows (in millions):



	2012			2011
Net current deferred tax assets	$	3.3		$	10.6
Net noncurrent deferred tax liabilities	(119.4		)	(122.6		)
Net deferred tax liabilities	$	(116.1	)	$	(112.0	)

In assessing the ability to realize deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which these temporary differences become deductible. Management considers the projected future taxable income and prudent and feasible tax planning strategies in making this assessment. As of December 31, 2012 and 2011, valuation allowances of $2.0 million and $2.8 million have been recorded, respectively, relating primarily to foreign net operating loss carryforwards.

The Company has certain state and foreign net operating loss carryforwards, the tax effect of which is approximately $10.6 million as of December 31, 2012. The state net operating loss carryforwards, the tax effect of which is approximately $6.9 million as of December 31, 2012, may be carried forward between 5 and 20 years, depending on the jurisdiction. The tax effect of the Company’s foreign net operating loss carryforwards is approximately $3.7 million as of December 31, 2012. These foreign net operating loss carryforwards are primarily related to the Company’s Canadian operations and begin to expire in 2015.

As of December 31, 2012, the Company has not made a provision for U.S. income taxes on unremitted foreign earnings because such earnings are intended to be indefinitely reinvested outside the U.S. Generally, such amounts become subject to U.S. taxation upon the remittance of dividends and certain other circumstances.

A reconciliation of the U.S. statutory federal income tax rate related to pretax income from continuing operations to the effective tax rate for the years ended December 31 is as follows:



	2012		2011		2010
U.S. statutory federal rate applied to pretax income	35.0	%	35.0	%	35.0	%
State and local income taxes, net of federal benefit	3.4		3.5		3.2
Foreign tax rate differential	(0.4	)	0.1		0.1
Non-deductible expenses	2.1		1.7		3.8
Change in state tax rate	0.2		0.2		(1.0	)
Domestic production activities deduction	(1.6	)	(0.9	)	(0.1	)
Other	1.2		0.0		1.1
Change in valuation allowance for deferred tax assets	(0.4	)	(0.8	)	(0.1	)
Effective income tax rate	39.5	%	38.8	%	42.0	%

An entity may only recognize or continue to recognize tax positions that meet a “more likely than not” threshold. In the ordinary course of business, there is inherent uncertainty in quantifying income tax positions. The Company assesses its income tax positions and records tax benefits for all years subject to examination based on management’s evaluation of the facts, circumstances and information available at the reporting date. For those tax positions where it is more likely than not that a tax benefit will be sustained, the Company has recognized the largest amount of tax benefit with a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is not more likely than not that a tax benefit will be sustained, no tax benefit has been recognized in the Company’s financial statements. Management believes that the Company has not taken material tax positions that would be deemed to be “uncertain,” therefore, the Company has not established a liability for uncertain positions for the year ended December 31, 2012.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

Segments and Operations by Geographic Area

Segments and Operations by Geographic Area

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Reorganization and Reportable Segments

In December 2012, MasTec completed a significant management reorganization resulting in four internal groups consisting of Communications, Electrical Transmission, Oil and Gas, and Power Generation and Industrial. Each is led by a single Group President and each is a reportable segment as defined in Accounting Standards Codification ("ASC ") 280, Segment Reporting. The reorganization focused on concentrating business development efforts and resources based upon broad end-user markets for the Company's construction services. The reorganization began informally in late 2011, after the completion of five acquisitions, and continued during 2012 by hiring group management and modifying reporting lines accordingly. The combination of the entities into each of the four groups is intended to enable each group to achieve better growth, better management and better profitability by leveraging customer relationships to increase cross-selling, offering greater geographic coverage to the Company's customers and achieving higher utilization and efficiency from both employees and equipment.

For instance, the Communications Group includes the Company's install-to-the-home, wireless and wireline businesses. Management believes that integrating all of our communications businesses enhances the Company's ability to take full advantage of all of the opportunities in what has become one commingled and converging communications market. Communications Group infrastructure construction services support a continually converging set of end user services. For example, telephone companies, cable television and satellite television operators now offer bundled telephony, video, data and internet services. We believe this revised organizational structure will enable the Company to better cross-sell and grow revenues in what is now a single communications market. In addition, communications network construction and maintenance utilizes substantially the same employee skill sets and equipment to perform similar work. Management expects that a single Group President should be able to improve costs and productivity more effectively by sharing people and equipment throughout all communications projects. Accordingly, in order to realize these objectives and to maximize opportunities in a converging communications market, these businesses have been organized into a single segment under a single leader.

Segment Discussion

MasTec presents its continuing operations under five reportable segments: (1) Communications; (2) Electrical Transmission; (3) Oil & Gas; (4) Power Generation and Industrial and (5) Other. This structure is generally focused on broad end-user markets for MasTec's labor-based construction services and has been determined in accordance with the criteria in ASC 280, Segment Reporting. All five reportable segments derive their revenues from the engineering, installation and maintenance of infrastructure, primarily in North America.

The Communications segment performs engineering, construction and maintenance of communications infrastructure primarily related to wireless and wireline communications and install to the home, and to a lesser extent, infrastructure for electrical utilities. The Electrical Transmission segment primarily serves the energy and utility industries through the engineering, construction and maintenance of electrical transmission lines and substations. MasTec also performs engineering, construction and maintenance services on oil and natural gas pipelines and processing facilities for the energy and utilities industries through the Oil & Gas segment. The Power Generation and Industrial segment primarily serves the energy and utility end markets and other end markets through the installation and construction of power plants, wind farms, solar farms, related electrical transmission infrastructure, ethanol facilities and various types of industrial infrastructure. The Other category primarily includes small business units that perform construction services for a variety of end markets in Mexico and elsewhere internationally.

The accounting policies of the reportable segments are the same as those described in Note 1 - Business, Basis of Presentation and Significant Accounting Policies. Intercompany revenues and costs among the reportable segments are de minimus and accounted for as if the sales were to third parties because these items are based on negotiated fees between the segments involved. All intercompany transactions and balances are eliminated in consolidation. Eliminations between segments are included in the Eliminations reconciling column in the tables below. Intercompany revenues and costs between entities within a reportable segment are eliminated to arrive at the segment totals. The Corporate column includes amounts related to Corporate functions such as administrative costs, professional fees, and acquisition costs. Segment results include certain allocations of centralized costs such as general liability, medical and workers' compensation insurance and certain information technology costs. Income tax expense is managed by Corporate on a consolidated basis and is not allocated to the reportable segments.

Income from continuing operations before non-controlling interests before interest, taxes, depreciation and amortization (“EBITDA”) is the measure of profitability used by our management to manage our segments and, accordingly, in our segment reporting. As appropriate, we supplement the reporting of our consolidated financial information determined in accordance with U.S. GAAP with certain non-U.S. GAAP financial measures, including EBITDA. We believe these non-U.S. GAAP measures provide meaningful information that helps investors understand our financial results and assess our prospects for future performance. We use EBITDA to evaluate our performance, both internally and versus our peers, because it excludes certain items that may not be indicative of our reportable segment results, as well as items that can vary widely across different industries or among companies within the same industry. Segment EBITDA is calculated in a manner consistent with consolidated EBITDA.

Corporate EBITDA in 2012 includes the $9.6 million legal settlement reserve we recorded in the third quarter of 2012, and in 2011, includes a $29.0 million gain on the remeasurement of our initial equity interest in EC Source to its fair value upon the acquisition of the remaining interest in the company. Total Corporate assets as of December 31, 2010 included the EC Source equity investment balance of approximately $10 million. See Note 17 - Commitments and Contingencies and Note 3 – Acquisitions and Other Investments for further discussion.

Summarized financial information for MasTec’s reportable segments is presented and reconciled to consolidated continuing operations financial information for total MasTec in the following tables (in millions):

As of and for the year ended December 31, 2012:



	Communications		Oil & Gas		Electrical Transmission		Power Generation & Industrial		Other		Corporate			Eliminations			Continuing Operations for Consolidated MasTec
Revenue	$	1,772.7	$	959.0	$	312.2	$	668.1	$	16.7	$	—		$	(1.9	)	$	3,726.8
EBITDA	$	192.0	$	99.4	$	38.7	$	32.0	$	2.0	$	(42.0	)	$	—		$	322.1
Depreciation	$	27.0	$	39.6	$	6.0	$	4.1	$	0.1	$	3.0		$	—		$	79.8
Amortization	$	2.1	$	2.5	$	5.0	$	2.6	$	—	$	—		$	—		$	12.2
Total Assets	$	829.2	$	805.5	$	309.9	$	321.6	$	7.0	$	93.5		$	15.0		$	2,381.7
Capital Expenditures	$	19.2	$	40.3	$	11.5	$	5.6	$	—	$	2.9		$	—		$	79.4

As of and for the year ended December 31, 2011:



	Communications		Oil & Gas		Electrical Transmission		Power Generation & Industrial			Other		Corporate		Eliminations			Continuing Operations for Consolidated MasTec
Revenue	$	1,635.1	$	774.3	$	198.3	$	219.6		$	4.8	$	—	$	(0.8	)	$	2,831.3
EBITDA	$	154.3	$	80.1	$	28.7	$	(3.2	)	$	0.4	$	7.6	$	—		$	267.9
Depreciation	$	22.7	$	26.8	$	4.0	$	3.9		$	0.1	$	2.7	$	—		$	60.2
Amortization	$	1.8	$	4.0	$	4.4	$	3.7		$	—	$	—	$	—		$	13.9
Total Assets	$	837.1	$	494.6	$	253.7	$	269.4		$	3.8	$	94.0	$	(10.2	)	$	1,942.4
Capital Expenditures	$	23.0	$	25.7	$	9.3	$	4.6		$	—	$	8.5	$	—		$	71.0

As of and for the year ended December 31, 2010:



	Communications		Oil & Gas		Electrical Transmission			Power Generation & Industrial		Other			Corporate			Eliminations			Continuing Operations for Consolidated MasTec
Revenue	$	1,190.6	$	562.6	$	67.0		$	325.6	$	0.2		$	—		$	(3.0	)	$	2,143.0
EBITDA	$	107.9	$	111.3	$	(3.7	)	$	16.9	$	(1.0	)	$	(31.3	)	$	—		$	200.1
Depreciation	$	13.4	$	20.8	$	3.1		$	4.3	$	—		$	2.4		$	—		$	44.0
Amortization	$	0.8	$	7.2	$	0.1		$	4.6	$	—		$	0.2		$	—		$	12.9
Total Assets	$	598.3	$	392.2	$	38.5		$	283.8	$	0.9		$	204.6		$	(9.6	)	$	1,508.7
Capital Expenditures	$	11.6	$	10.5	$	—		$	3.1	$	0.1		$	2.5		$	—		$	27.8

Revenue generated by utilities customers represented 8.3%, 8.9% and 10.9% of Communications segment revenues in 2012, 2011 and 2010, respectively.

The following table, which may contain slight summation differences due to rounding, presents a reconciliation of EBITDA to consolidated income from continuing operations before provision for income taxes:



	For the Years Ended December 31,
	2012			2011			2010
EBITDA	$	322.1		$	267.9		$	200.1
Less:
Interest expense, net	(37.4		)	(34.5		)	(29.2		)
Depreciation	(79.8		)	(60.2		)	(44.0		)
Amortization	(12.2		)	(13.9		)	(12.9		)
Income from continuing operations before provision for income taxes	$	192.7		$	159.3		$	114.1

A reconciliation of total assets for continuing operations to consolidated total assets as of the dates indicated is as follows:



	As of December 31,
	2012		2011		2010
Total assets for continuing operations	$	2,381.7	$	1,942.4	$	1,508.7
Current assets of discontinued operations	18.6		30.6		43.1
Long-term assets of discontinued operations	7.6		121.7		104.0
Total assets	$	2,407.9	$	2,094.7	$	1,655.8

Foreign Operations. The Company has operations in Canada as well as in parts of Latin America and the Caribbean. For the years ended December 31, 2012, 2011 and 2010, revenues from continuing operations of $156.8 million, $91.5 million and $0.2 million, respectively, were derived from foreign operations and revenues of $3.6 billion, $2.7 billion and $2.1 billion, respectively, were derived in the United States. For the years ended December 31, 2012, 2011 and 2010, revenues within the results of operations from discontinued operations of $5.8 million, $12.4 million and $2.7 million, respectively, were derived from foreign operations, with revenues of $73.1 million, $165.3 million and $162.3 million, respectively, derived in the United States. Long-lived assets held in foreign countries include property and equipment, net of $12.9 million and $12.7 million as of December 31, 2012 and 2011, respectively, of which $1.5 million and $1.6 million, respectively, were classified within long-term assets of discontinued operations. Intangible assets and goodwill, net, of $30.5 million and $30.0 million as of December 31, 2012 and 2011, respectively, were held in foreign countries, none of which was classified within long-term assets of discontinued operations.

Significant Customers

Revenue concentration information for significant customers, as a percent of total consolidated revenue from continuing operations, is as follows:



	2012	2011	2010
Customer:
AT&T	18%	24%	22%
DIRECTV^®	17%	20%	20%

Our relationship with AT&T is based upon master service agreements, other service agreements and construction/installation contracts for both AT&T's wireless and wireline businesses. AT&T activity is included in the Communications segment.

Our relationship with DIRECTV^® is based upon an agreement to provide installation and maintenance services for DIRECTV^®. DIRECTV^® activity is included in the Communications segment.

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In addition to the matters discussed below, MasTec is subject to a variety of legal cases, claims and other disputes that arise from time to time in the ordinary course of its business. MasTec cannot provide assurance that it will be successful in recovering all or any of the potential damages it has claimed or in defending claims against it. Legacy Litigation. MasTec is subject to litigation, some of which dates from the period 2001 through 2006. Outstanding Legacy Litigation The Company was pursuing claims in excess of $5 million against Aon Risk Services, Inc. of Florida ("Aon"), an insurance broker, for breach of contract and breach of fiduciary duty for the losses arising from a denial of insurance coverage. In September 2012, the parties reached an agreement whereby the Company would recover $3.5 million from Aon, which resulted in a small gain considering expenses incurred, in exchange for a release. Payment was received in October 2012, which was reflected in the Company's results of operations in the fourth quarter of 2012. The labor union representing the workers of Sistemas e Instalaciones de Telecomunicacion S.A. (“Sintel”), a former MasTec subsidiary that was sold in 1998, filed a claim that initiated an investigative action with the Audiencia Nacional, a Spanish federal court, against Telefonica and dozens of other defendants including current and former officers and directors of MasTec (including Jorge Mas, Chairman of the Company’s Board of Directors) and Sintel, relating to Sintel’s 2000 bankruptcy. The labor union alleged Sintel and its creditors were damaged in the approximate amount of 300 million euros (approximately $396 million as of December 31, 2012). In June 2009, the Audiencia Nacional issued an order that the trial phase was commencing against the MasTec defendants and other defendants. On June 14, 2012, the Sintel trial began. As a consequence of the MasTec defendants' arguments and presentation of evidence, a meeting with the prosecutor took place on July 24, 2012. At that meeting, a tentative agreement (the “Agreement”) was reached which would result in the exoneration of the MasTec defendants and the dismissal of all the charges against them (including Jorge Mas, our Chairman). The Agreement includes an acknowledgment that the MasTec defendants acted in good faith and did not cause Sintel’s bankruptcy. We entered into the Agreement in order to avoid significant legal fees and the potential liabilities resulting from the actions of other Spanish defendants for which MasTec may be financially responsible under a theory of subsidiary (or vicarious) liability, the uncertainty of a trial before a foreign tribunal such as the Audiencia Nacional and to eliminate management time devoted to this matter. MasTec recorded a pre-tax charge of $9.6 million in 2012 in connection with this Agreement, which is included within other expense, net, in the accompanying consolidated financial statements. As part of this Agreement, MasTec would be dismissed from the case with prejudice. This Agreement was subject to further negotiation and satisfaction of several conditions, which currently have not been met. There can be no assurance that the Agreement will be completed. A trial is expected to occur if the Agreement is not completed Other Outstanding Litigation During 2010 and 2011, pursuant to a written contract, the Company provided certain construction services for the City of Marathon in Marathon, Florida. We completed those services in 2011. At the end of 2011, the Company had still not been paid for all of the work performed on the project. In December 2011, the Company filed a lawsuit seeking in excess of $6 million against the City of Marathon for breach of contract and against the City of Marathon’s engineers for professional negligence. The City of Marathon and the engineers filed answers denying liability and claiming that the Company breached the contract. Discovery is ongoing. The Company is pursuing and will continue to vigorously pursue these claims. Other Commitments and Contingencies Leases. In the ordinary course of business, the Company enters into non-cancelable operating leases for certain of its facility, vehicle and equipment needs, including related party leases. These leases allow the Company to conserve cash and provide flexibility in that we pay a monthly rental fee for use of the related facilities, vehicles and equipment rather than purchasing them. The terms of these agreements vary from lease to lease, including some with renewal options and escalation clauses. The Company may decide to cancel or terminate a lease before the end of its term, in which case the Company is typically liable for the remaining lease payments under the term of the lease. Rent expense related to operating leases, including short-term rentals, reflected within continuing operations was approximately $222.5 million, $168.8 million and $129.3 million for the years ended December 31, 2012, 2011 and 2010, respectively. Letters of Credit. In the ordinary course of business, the Company is required to post letters of credit for its insurance carriers, surety bond providers and in support of performance under certain contracts. Such letters of credit are generally issued by a bank or similar financial institution. The letter of credit commits the issuer to pay specified amounts to the holder of the letter of credit under certain conditions. If this were to occur, the Company would be required to reimburse the issuer of the letter of credit, which, depending upon the circumstances, could result in a charge to earnings. As of December 31, 2012 and 2011, the Company had $120.8 million and $90.0 million, respectively, of letters of credit issued under its Credit Facility, of which $53.2 million and $51.4 million, respectively, pertained to certain of the Company's insurance carriers. The Company is not aware of any material claims relating to outstanding letters of credit as of December 31, 2012 or December 31, 2011. Performance and Payment Bonds. In the ordinary course of business, MasTec is required by certain customers to provide performance and payment bonds for some of the Company’s contractual commitments related to projects in process. These bonds provide a guarantee to the customer that the Company will perform under the terms of a contract and that the Company will pay subcontractors and vendors. If the Company fails to perform under a contract or to pay subcontractors and vendors, the customer may demand that the surety make payments or provide services under the bond. The Company must reimburse the surety for any expenses or outlays it incurs. As of December 31, 2012, the estimated cost to complete projects secured by the Company’s $1.1 billion in performance and payment bonds was $284.5 million. As of December 31, 2011, the estimated cost to complete projects secured by the Company’s $905.7 million in performance and payment bonds was $330.0 million. Self-Insurance. MasTec maintains insurance policies subject to per claim deductibles of $1 million for its workers’ compensation policy, $2 million for its general liability policy and $2 million for its automobile liability policy. The Company has excess umbrella coverage up to $100 million per claim and in the aggregate. As of December 31, 2012 and 2011, MasTec’s liability for unpaid claims and associated expenses, including incurred but not reported losses related to its workers compensation, general liability and automobile liability insurance policies, was $48.1 million and $39.1 million, respectively, of which $28.5 million and $22.3 million, respectively, was reflected within non-current other liabilities in the consolidated financial statements. MasTec also maintains an insurance policy with respect to employee group health claims, which is subject to annual per employee maximum losses of $0.4 million MasTec’s liability for employee group claims as of December 31, 2012 and 2011 was $1.1 million and $1.4 million, respectively. The Company is required to post letters of credit and provide cash collateral to certain of its insurance carriers and to provide surety bonds in certain states in which the Company is self-insured. As of December 31, 2012 and 2011, these letters of credit amounted to $53.2 million and $51.4 million, respectively. In addition, cash collateral deposited with insurance carriers, which is included in other long-term assets in the consolidated balance sheets, amounted to $2.0 million as of both December 31, 2012 and December 31, 2011. Outstanding surety bonds related to workers’ compensation self-insurance programs amounted to $9.0 million and $7.1 million as of December 31, 2012 and 2011, respectively. Employment Agreements. The Company has employment agreements with certain executives and other employees, which provide for compensation and certain other benefits and for severance payments under certain circumstances. Certain employment agreements also contain clauses that become effective upon a change of control of the Company. Upon the occurrence of any of the defined events in the various employment agreements, the Company would be obligated to pay certain amounts to the relevant employees, which vary with the level of the employees’ respective responsibility. Collective Bargaining Agreements and Multi-Employer Pension Plans. Certain of MasTec’s subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees. The agreements require the subsidiaries party to the agreements to pay specified wages, provide certain benefits to their union employees and contribute certain amounts to multi-employer pension plans and employee benefit trusts. The multi-employer pension plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls. The required amount of future contributions cannot be determined for future periods because the number of union employees employed at any given time, and the plans in which they participate, vary depending upon the location and number of ongoing projects and the need for union resources in connection with those projects. The collective bargaining agreements expire at various times and have typically been renegotiated and renewed on terms similar to the ones contained in the expiring agreements. The Employee Retirement Income Security Act of 1974, as amended by the Multi-Employer Pension Plan Amendments Act of 1980, subjects employers to substantial liabilities in the event of the employer’s complete or partial withdrawal from, or upon termination of, such plans. Under current law regarding employers who are contributors to multi-employer defined benefit plans, a plan’s termination, an employer’s voluntary withdrawal from, or the mass withdrawal of all contributing employers from, an underfunded multi-employer defined benefit plan requires participating employers to make payments to the plan for their proportionate share of the multi-employer plan’s unfunded vested liabilities. Furthermore, the Pension Protection Act of 2006 added new funding rules generally applicable to plan years beginning after 2007 for multi-employer plans that are classified as “endangered,” “seriously endangered,” or “critical” status. If plans in which the Company’s subsidiaries participate are in critical status, benefit reductions may apply and/or the Company could be required to make additional contributions if the plans are determined to be underfunded. Based upon the information available to the Company from plan administrators as of December 31, 2012, several of the multi-employer pension plans in which the Company’s subsidiaries participate are underfunded. The Pension Protection Act requires that underfunded pension plans improve their funding ratios within prescribed intervals based on the level of their underfunding. In addition, if a multi-employer defined benefit plan fails to satisfy certain minimum funding requirements, the Internal Revenue Service may impose on the employers contributing to such plan a nondeductible excise tax of 5% on the amount of the accumulated funding deficiency. The Company’s subsidiaries have been notified that certain plans to which they contribute are in “critical” status and require additional contributions in the form of a surcharge on future benefit contributions required for future work performed by union employees covered by these plans. As a result, the Company's required contributions to these plans could increase in the future. The amount of additional funds the Company may be obligated to contribute in the future cannot be estimated, as such amounts will be based on future levels of work that require the specific use of those union employees covered by these plans. On November 15, 2011, the Company, along with other members of the Pipe Line Contractors Association (“PLCA”), voluntarily withdrew from the Central States Southeast and Southwest Areas Pension Fund (“Central States”), a defined benefit multi-employer pension plan. In connection with this withdrawal, the Company recorded a $6.4 million withdrawal liability based on an estimate provided by the plan administrator of such liability as of the date of withdrawal. The Company withdrew from the Central States Plan in order to mitigate its liability in connection with the plan, which is in critical status; however, the plan has asserted that the PLCA members did not effectively withdraw on November 15, 2011. Although the Company believes that it legally and effectively withdrew from the plan on November 15, 2011, if the plan were to prevail in its assertion that the Company in fact withdrew after that date, then the amount of the Company’s withdrawal liability would increase. In addition, if this plan were to undergo a mass withdrawal, as defined by ERISA and the Pension Benefit Guaranty Corporation, within the three year period commencing with the beginning of the calendar year during which the Company withdrew from the plan, there could be additional liability. The Company currently does not have plans to withdraw from any other multi-employer pension plan. See Note 13 – Other Retirements Plans for additional details. Indemnities. The Company generally indemnifies its customers for the services it provides under its contracts, as well as other specified liabilities, which may subject the Company to indemnity claims, liabilities and related litigation. As of December 31, 2012 and 2011, the Company was not aware of any material asserted or unasserted claims in connection with these indemnity obligations. Other Guarantees. In the ordinary course of its business, from time to time, MasTec guarantees the obligations of its subsidiaries, including obligations under certain contracts with customers, certain lease obligations and in some states, obligations in connection with obtaining contractors’ licenses. MasTec also generally warrants the work it performs for a one to two year period following substantial completion of a project. MasTec has not historically accrued any reserves for potential warranty claims as they have been immaterial.

The entire disclosure for commitments and contingencies.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Concentrations of Risk

12 Months Ended

Dec. 31, 2012

Risks and Uncertainties [Abstract]

Concentrations of Risk

The Company is subject to certain risk factors, including, but not limited to: risks related to seasonality of its business, adverse weather conditions, economic downturns, technological and regulatory changes in the industries it serves; competition within its industry; the nature of its contracts, which do not obligate MasTec’s customers to undertake any infrastructure projects and may be canceled on short notice; collectibility of receivables; acquisition integration and financing; availability of qualified employees; recoverability of goodwill; potential exposures to environmental liabilities; and exposure to multi-employer pension plan liabilities.

The Company grants credit, generally without collateral, to its customers. Consequently, the Company is subject to potential credit risk related to changes in business and economic factors. However, MasTec generally has certain lien rights on that work and concentration of credit risk is limited due to the diversity of the customer base. The Company believes its billing and collection policies are adequate to minimize potential credit risk.

The Company had approximately 400 customers as of December 31, 2012, which included some of the largest and most prominent companies in the communications and utilities industries. MasTec’s customers include public and private energy providers, pipeline operators, wireless service providers, satellite and broadband operators, local and long distance carriers and government entities. The industries served by MasTec’s customers include, among others: utilities (including electrical utility transmission and distribution; power generation; natural gas and petroleum pipeline infrastructure; wind farms, solar farms and other renewable energy; and industrial infrastructure) and communications (including wireless, wireline and satellite communications).

Revenue concentration information for the Company's top ten customers, as a percent of total consolidated revenue from continuing operations, is as follows:



	2012	2011	2010
Revenue from top ten customers	64%	71%	72%

See Note 16 - Segments and Operations by Geographic Area for significant customer revenue concentration information.

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 825
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-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 825
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-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 94-6
-Paragraph 21, 22, 24
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2012
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions MasTec leases employees to a customer, in which Jorge Mas and Jose Mas own a minority interest. For the years ended December 31, 2012, 2011 and 2010, MasTec charged approximately $527,000, $480,000, and $463,000 respectively, to the customer. As of December 31, 2012 and 2011, receivables of $907,000 and $860,000, respectively, attributable to this arrangement were outstanding. The Company also provides satellite communication services to this customer. For the years ended December 31, 2012, 2011 and 2010, revenues relating to this customer were approximately $1,214,000, $1,123,000 and $979,000, respectively. As of December 31, 2012 and 2011, receivables from this arrangement of approximately $1,232,000 and $775,000, respectively, were outstanding. The Company charters an aircraft from a third party which leases two of its aircraft from entities in which Jorge Mas and Jose Mas have an ownership interest. MasTec paid this unrelated chartering company approximately $2,000, $66,000 and $560,000 for the years ended December 31, 2012, 2011 and 2010, respectively. MasTec leases a property located in Florida from Irma S. Mas, the mother of Jorge Mas and Jose Mas. For the year ended December 31, 2012, the Company paid lease payments of approximately $44,000 in connection with this property. For each of the two years in the period ended December 31, 2011, the Company paid lease payments of approximately $48,000 in connection with this property. MasTec purchases, rents and leases equipment used in its business from a number of different vendors on a non-exclusive basis, including Neff Corp. (“Neff”). Juan Carlos Mas, who was the chairman of the Neff Board of Directors through September 30, 2010, is the brother of Jorge Mas, Chairman of MasTec’s Board of Directors, and Jose Mas, MasTec’s Chief Executive Officer. For the nine months ended September 30, 2010, MasTec paid Neff approximately $859,000 for equipment purchases, rentals and leases. As of October 1, 2010, Juan Carlos Mas was no longer serving on the Neff Board of Directors. Split Dollar and Deferred Bonus Agreements MasTec has a split dollar agreement with Jorge Mas. Under this agreement, MasTec is the sole owner and beneficiary of each of the policies subject to the agreement and upon the death of the insured or insureds under the applicable policy, MasTec is entitled to receive a portion of the death benefit under such policy equal to the greater of (i) the total premiums paid by MasTec on such policy, or (ii) the then cash value of such policy immediately before the death of the insured or insureds, excluding surrender charges. Upon termination of the agreement, Jorge Mas, or in the case of a second to die policy, the second to die of Jorge Mas and his wife have an option to purchase each policy subject to the agreement for a purchase price equal to the greater of the amounts referenced above. The total maximum face amount of the insurance for all policies subject to the split dollar agreement was capped at $200 million. MasTec will make the premium payments until the agreement is terminated, which occurs upon any of the following events: (i) bankruptcy or dissolution of MasTec, or (ii) a change in control of MasTec. In connection with the split dollar agreements for Jorge Mas, MasTec paid approximately $284,000 for each of the three years in the period ended December 31, 2012. MasTec also has a deferred bonus agreement with Jorge Mas. Under this agreement, which is triggered upon a change in control of MasTec, the deferred bonus is equal to the sum of the following amounts, determined with respect to each policy subject to the split dollar agreement: the greater of (i) the total premiums paid by MasTec under such policy, or (ii) the then cash value of such policy immediately prior to the change in control, excluding surrender charges. MasTec also has a split dollar agreement and a deferred bonus agreement with Jose Mas. The split dollar agreement provides that one or more life insurance policies may be subject to the agreement. At this time, however, the only policy subject to the agreement is the one acquired pursuant to the original agreement, which is in an aggregate face amount of $11 million. MasTec is the sole owner and beneficiary of any policy subject to the agreement, and upon the death of the insured, MasTec is entitled to receive a portion of the death benefit equal to the greater of (i) the total premiums paid by MasTec on such policy, or (ii) the then cash value of such policy immediately before the death of the insured, excluding surrender charges. Upon termination of the agreement, Jose Mas has an option to purchase each policy, subject to the agreement for a purchase price equal to the greater of the amounts referenced above. MasTec will make the premium payments until the agreement is terminated, which occurs upon any of the following events: (i) bankruptcy or dissolution of MasTec, or (ii) a change in control of MasTec. For the years ended December 31, 2012 and 2011, MasTec did not make any payments in connection with the split dollar agreement for Jose Mas. For the year ended December 31, 2010, MasTec paid approximately $115,000 in connection with the split dollar agreement for Jose Mas. The amount of deferred bonus that is payable upon termination of the split dollar agreement, which is triggered upon a change in control of MasTec, is equal to the sum of the following amounts, determined with respect to each policy subject to the split dollar agreement: the greater of (i) the total premiums paid by MasTec under the terms of such policy, or (ii) the then cash value of such policy immediately prior to the change in control, excluding surrender charges. The Company adjusts the value of life insurance policies associated with the split dollar agreements each period based on their current cash surrender values. The estimated fair value of these life insurance policies of $8.7 million and $7.9 million as of December 31, 2012 and 2011, respectively, is included in other assets in the consolidated balance sheets.

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39678-107864

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 850
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-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph b
-Article 3A

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph k
-Article 4

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 57
-Paragraph 1-4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Quarterly Financial Information Disclosure [Abstract]

Quarterly Information (Unaudited)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information (Unaudited)

Quarterly Information (Unaudited)

The following table presents unaudited quarterly operating results for the years ended December 31, 2012 and 2011 (in millions, except per share data). The Company believes that all necessary adjustments have been included in the amounts stated below to present fairly the quarterly results when read in conjunction with the consolidated financial statements and notes thereto.



	2012 Quarter Ended											2011 Quarter Ended
	March 31		June 30			September 30			December 31			March 31		June 30		September 30		December 31
Revenue	$	738.3	$	988.9		$	1,067.3		$	932.3		$	573.6	$	709.9	$	816.2	$	731.6
Income from continuing operations before non-controlling interests	11.7		31.2			36.1			37.6			16.3		43.4		30.8		7.0
Income (loss) from discontinued operations	2.5		(1.1		)	(9.3		)	(1.3		)	4.8		1.1		1.0		1.6
Net income attributable to MasTec	$	14.2	$	30.1		$	26.8		$	36.3		$	21.1	$	44.5	$	31.8	$	8.6
Basic earnings (loss) per share ^(a)
Continuing operations	$	0.15	$	0.39		$	0.47		$	0.50		$	0.21	$	0.52	$	0.36	$	0.08
Discontinued operations	0.03		(0.01		)	(0.12		)	(0.02		)	0.06		0.01		0.01		0.02
Total basic earnings per share	$	0.18	$	0.37		$	0.35		$	0.48		$	0.27	$	0.53	$	0.37	$	0.10
Diluted earnings (loss) per share ^(a)
Continuing operations	$	0.14	$	0.38		$	0.45		$	0.46		$	0.20	$	0.50	$	0.35	$	0.08
Discontinued operations	0.03		(0.01		)	(0.12		)	(0.02		)	0.06		0.01		0.01		0.02
Total diluted earnings per share	$	0.17	$	0.37		$	0.34		$	0.45		$	0.26	$	0.51	$	0.36	$	0.10

(a) Note that due to rounding differences, the sum of the Company’s quarterly earnings per share in a given year may not be the same as the Company’s year to date earnings per share for the same period. In addition, earnings per share calculations may contain slight summation differences due to rounding. See Note 2 – Earnings per Share.

During the years ended December 31, 2012 and 2011, the Company acquired certain businesses. As a result, the quarterly results of 2012 may not be comparable with those of 2011. See Note 3 - Acquisitions and Other Investments for details of the Company's recently acquired businesses.

In June 2012, the Company sold its DirectStar business. Additionally, in September 2012, MasTec's board of directors approved a plan of sale for the Globetec business. In connection with its decision to sell Globetec, the Company recognized impairment losses of $12.7 million during the third quarter of 2012. DirectStar and Globetec are presented as discontinued operations in the consolidated financial statements for all periods presented. See Note 4 - Discontinued Operations.

In addition, the Company recorded a $9.6 million legal settlement reserve in 2012 in connection with the Sintel legal matter and a $29.0 million gain on the remeasurement of its equity investment of EC Source in the second quarter of 2011. The Company also recorded a $6.4 million charge resulting from the Company's voluntarily withdrawal from a multi-employer pension plan. See Note 3 - Acquisitions and Other Investments and Note 17 - Commitments and Contingencies.

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

Supplemental Guarantor Financial Information

Supplemental Guarantor Financial Information

12 Months Ended

Dec. 31, 2012

Text Block [Abstract]

The Senior Notes, New Convertible Notes and Original Convertible Notes are fully and unconditionally guaranteed on an unsecured, unsubordinated, joint and several basis by certain of the Company's existing and future 100%-owned direct and indirect domestic subsidiaries that are each guarantors of the Company's Credit Facility or other outstanding indebtedness (the “Guarantor Subsidiaries”). The Company's subsidiaries organized outside of the U.S. and certain domestic subsidiaries (collectively, the “Non-Guarantor Subsidiaries”) do not guarantee the Senior Notes, New Convertible Notes and Original Convertible Notes. The subsidiary guarantees with respect to the Senior Notes, New Convertible Notes and Original Convertible Notes are subject to release in certain customary circumstances including upon the sale of a majority of the capital stock or substantially all of the assets of the subsidiary guarantor; if the guarantee under our Credit Facility and other indebtedness is released or discharged (other than due to payment under such guarantee); or when the requirements for legal defeasance are satisfied or the obligations are discharged in accordance with the related indentures.

The following supplemental financial information sets forth the condensed consolidating balance sheets and the condensed consolidating statements of operations and comprehensive income and cash flows for the parent company (MasTec, Inc.), the Guarantor Subsidiaries on a combined basis, the Non-Guarantor Subsidiaries on a combined basis and the eliminations necessary to arrive at the information for the Company as reported on a consolidated basis. Eliminations represent adjustments to eliminate investments in subsidiaries and intercompany balances and transactions between or among MasTec, Inc., the Guarantor Subsidiaries and the Non-Guarantor Subsidiaries. Investments in subsidiaries are accounted for using the equity method for this presentation. Information for periods prior to 2011 is not presented as MasTec, Inc. is a holding company with no independent assets or operations, and the Company's subsidiaries that did not guarantee the Senior Notes, New Convertible Notes and Original Convertible Notes were minor in all periods prior to 2011, individually and in the aggregate, as such term is defined under the rules and regulations of the SEC.

CONDENSED CONSOLIDATING BALANCE SHEETS

As of December 31, 2012 (in thousands)



	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Assets
Current assets	$	—	$	980,104	$	48,373		$	—		$	1,028,477
Current assets of discontinued operations	—		13,836		4,755			—			18,591
Property and equipment, net	—		338,974		11,381			—			350,355
Goodwill and other intangible assets, net	—		926,712		30,729			—			957,441
Net investments in and advances to (from) consolidated affiliates	854,993		172,534		(21,779		)	(1,005,748		)	—
Other assets	7,702		37,640		80			—			45,422
Long-term assets of discontinued operations	—		4,711		2,937			—			7,648
Total assets	$	862,695	$	2,474,511	$	76,476		$	(1,005,748	)	$	2,407,934
Liabilities and Shareholders’ Equity
Current liabilities	$	22	$	678,301	$	22,810		$	—		$	701,133
Current liabilities of discontinued operations	—		574		3,995			—			4,569
Long-term debt	—		546,262		61			—			546,323
Other liabilities	—		273,198		20,776			—			293,974
Total liabilities	$	22	$	1,498,335	$	47,642		$	—		$	1,545,999
Total shareholders’ equity	$	862,673	$	976,176	$	28,834		$	(1,005,748	)	$	861,935
Total liabilities and shareholders’ equity	$	862,695	$	2,474,511	$	76,476		$	(1,005,748	)	$	2,407,934

CONDENSED CONSOLIDATING BALANCE SHEETS

As of December 31, 2011 (in thousands)



	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Assets
Current assets	$	—	$	744,868	$	53,328		$	—		$	798,196
Current assets of discontinued operations	—		22,572		8,036			—			30,608
Property and equipment, net	—		251,948		11,059			—			263,007
Goodwill and other intangible assets, net	—		793,832		31,635			—			825,467
Net investments in and advances to (from) consolidated affiliates	811,982		117,963		(41,830		)	(888,115		)	—
Other assets	7,119		47,580		1,033			—			55,732
Long-term assets of discontinued operations	—		114,378		7,317			—			121,695
Total assets	$	819,101	$	2,093,141	$	70,578		$	(888,115	)	$	2,094,705
Liabilities and Shareholders’ Equity
Current liabilities	—		533,906		29,265			—			563,171
Current liabilities of discontinued operations	—		20,912		8,362			—			29,274
Long-term debt	—		460,603		87			—			460,690
Other liabilities	—		209,225		21,138			—			230,363
Total liabilities	$	—	$	1,224,646	$	58,852		$	—		$	1,283,498
Total shareholders’ equity	$	819,101	$	868,495	$	11,726		$	(888,115	)	$	811,207
Total liabilities and shareholders’ equity	$	819,101	$	2,093,141	$	70,578		$	(888,115	)	$	2,094,705

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME

For the Year Ended December 31, 2012 (in thousands)



	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	3,538,288		$	188,501		$	—		$	3,726,789
Costs of revenue, excluding depreciation and amortization	—			3,074,031			165,164			—			3,239,195
Depreciation and amortization	2			89,626			2,330			—			91,958
General and administrative expenses	1,665			145,831			10,028			—			157,524
Interest expense, net	—			37,378			(2		)	—			37,376
Other expense, net	—			7,838			179			—			8,017
(Loss) income from continuing operations before provision for income taxes	$	(1,667	)	$	183,584		$	10,802		$	—		$	192,719
Benefit (provision) for income taxes	675			(74,440		)	(2,315		)	—			(76,080		)
(Loss) income from continuing operations before non-controlling interests	$	(992	)	$	109,144		$	8,487		$	—		$	116,639
(Loss) income from discontinued operations, net of tax	—			(7,390		)	(1,833		)	—			(9,223		)
Equity in income from subsidiaries, net of tax	108,408			—			—			(108,408		)	—
Net income (loss)	$	107,416		$	101,754		$	6,654		$	(108,408	)	$	107,416
Net loss attributable to non-controlling interests	—			—			(10		)	—			(10		)
Net income (loss) attributable to MasTec, Inc.	$	107,416		$	101,754		$	6,664		$	(108,408	)	$	107,426
Comprehensive income (loss)	$	107,416		$	102,275		$	8,578		$	(108,408	)	$	109,861

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME

For the Year Ended December 31, 2011 (in thousands)



	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	2,726,618		$	104,674		$	—		$	2,831,292
Costs of revenue, excluding depreciation and amortization	—			2,360,578			99,168			—			2,459,746
Depreciation and amortization	—			71,905			2,246			—			74,151
General and administrative expenses	2,530			125,136			4,928			—			132,594
Interest expense, net	—			34,391			75			—			34,466
Gain on remeasurement of equity interest in acquiree	—			(29,041		)	—			—			(29,041		)
Other expense (income), net	—			224			(128		)	—			96
(Loss) income from continuing operations before provision for income taxes	$	(2,530	)	$	163,425		$	(1,615	)	$	—		$	159,280
Benefit (provision) for income taxes	989			(64,395		)	1,582			—			(61,824		)
(Loss) income from continuing operations before non-controlling interests	$	(1,541	)	$	99,030		$	(33	)	$	—		$	97,456
Income (loss) from discontinued operations, net of tax	—			10,007			(1,491		)	—			8,516
Equity in income from subsidiaries, net of tax	107,513			—			—			(107,513		)	—
Net income (loss)	$	105,972		$	109,037		$	(1,524	)	$	(107,513	)	$	105,972
Net loss attributable to non-controlling interests	—			—			(29		)	—			(29		)
Net income (loss) attributable to MasTec, Inc.	$	105,972		$	109,037		$	(1,495	)	$	(107,513	)	$	106,001
Comprehensive income (loss)	$	105,972		$	108,877		$	(3,154	)	$	(107,513	)	$	104,182

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Year Ended December 31, 2012 (in thousands)



	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(1,254	)	$	151,866		$	21,523		$	—	$	172,135
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	$	—		$	(151,736	)	$	(1,402	)	$	—	$	(153,138	)
Capital expenditures	—			(77,744		)	(1,942		)	—		(79,686		)
Proceeds from sale of assets	—			7,385			—			—		7,385
Proceeds from disposal of business, net	—			97,728			—			—		97,728
Investments in life insurance policies	(284		)	—			—			—		(284		)
Net cash used in investing activities	$	(284	)	$	(124,367	)	$	(3,344	)	$	—	$	(127,995	)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	$	—		$	959,183		$	—		$	—	$	959,183
Repayments of credit facility	—			(885,183		)	—			—		(885,183		)
Repayments of other borrowings	—			(21,455		)	—			—		(21,455		)
Proceeds from book overdrafts	—			116			—			—		116
Payments of capital lease obligations	—			(21,034		)	(26		)	—		(21,060		)
Proceeds from stock options exercises and other share-based awards	5,013			—			—			—		5,013
Excess tax benefit from stock-based compensation	—			759			—			—		759
Purchases of treasury stock	(75,000		)	—			—			—		(75,000		)
Payments of financing costs	—			(117		)	—			—		(117		)
Net financing activities and advances (to) from consolidated affiliates	71,525			(58,181		)	(13,344		)	—		—
Net cash provided by (used in) financing activities	$	1,538		$	(25,912	)	$	(13,370	)	$	—	$	(37,744	)
Net increase (decrease) in cash and cash equivalents	—			1,587			4,809			—		6,396
Net effect of currency translation on cash	—			—			91			—		91
Cash and cash equivalents - beginning of period	—			16,240			4,040			—		20,280
Cash and cash equivalents - end of period	$	—		$	17,827		$	8,940		$	—	$	26,767
Cash and cash equivalents of discontinued operations	$	—		$	275		$	110		$	—	$	385
Cash and cash equivalents of continuing operations	$	—		$	17,552		$	8,830		$	—	$	26,382

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Year Ended December 31, 2011 (in thousands)



	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(939	)	$	21,729		$	(14,964	)	$	—	$	5,826
Cash flows used in investing activities:
Cash paid for acquisitions, net, including contingent consideration	$	(31,236	)	$	(44,716	)	$	(9,443	)	$	—	$	(85,395	)
Capital expenditures	—			(71,615		)	(95		)	—		(71,710		)
Proceeds from sale of assets	—			5,887			340			—		6,227
Proceeds from sale or redemption of investments	—			4,600			—			—		4,600
Investments in life insurance policies	(284		)	—			—			—		(284		)
Net cash used in investing activities	$	(31,520	)	$	(105,844	)	$	(9,198	)	$	—	$	(146,562	)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	$	—		$	370,411		$	—		$	—	$	370,411
Repayments of credit facility	—			(310,411		)	—			—		(310,411		)
Repayments of other borrowings	—			(13,956		)	—			—		(13,956		)
Proceeds from book overdrafts	—			14,906			—			—		14,906
Payments of capital lease obligations	—			(16,422		)	(36		)	—		(16,458		)
Proceeds from stock options exercises and other share-based awards	12,542			—			—			—		12,542
Excess tax benefit from stock-based compensation	—			7,766			—			—		7,766
Purchases of treasury stock	(75,000		)	—			—			—		(75,000		)
Payments of financing costs	—			(6,589		)	—			—		(6,589		)
Net financing activities and advances (to) from consolidated affiliates	94,917			(122,573		)	27,656			—		—
Net cash provided by (used in) financing activities	$	32,459		$	(76,868	)	$	27,620		$	—	$	(16,789	)
Net (decrease) increase in cash and cash equivalents	—			(160,983		)	3,458			—		(157,525		)
Net effect of currency translation on cash	—			—			201			—		201
Cash and cash equivalents - beginning of period	—			177,223			381			—		177,604
Cash and cash equivalents - end of period	$	—		$	16,240		$	4,040		$	—	$	20,280
Cash and cash equivalents of discontinued operations	$	—		$	11,386		$	1,488		$	—	$	12,874
Cash and cash equivalents of continuing operations	$	—		$	4,854		$	2,552		$	—	$	7,406

Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2012

Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS

(in millions)



	Balance at Beginning of Period		Charges			(Deductions)				Balance at End of Period
Year ended December 31, 2012
Deducted from asset accounts:
Allowance for doubtful accounts	$	7.6	$	6.9	⁽¹⁾	$	(3.3	)	⁽²⁾	$	11.2
Provision for inventory obsolescence	2.2		2.3		⁽³⁾	(2.5		)	⁽⁴⁾	2.0
Unrealized losses on securities available for sale	1.0		—			(0.8		)	⁽⁵⁾	0.2
Valuation allowance for deferred tax assets	2.8		0.5		⁽⁶⁾	(1.3		)	⁽⁷⁾	2.0
Total	$	13.6	$	9.7		$	(7.9	)		$	15.4
Year ended December 31, 2011
Deducted from asset accounts:
Allowance for doubtful accounts	$	8.3	$	2.0	⁽¹⁾	$	(2.7	)	⁽²⁾	$	7.6
Provision for inventory obsolescence	0.4		3.1		⁽³⁾	(1.3		)	⁽⁴⁾	2.2
Unrealized losses on securities available for sale	0.8		0.7		⁽⁸⁾	(0.5		)	⁽⁹⁾	1.0
Valuation allowance for deferred tax assets	5.6		0.4		⁽⁶⁾	(3.2		)	⁽⁷⁾	2.8
Total	$	15.1	$	6.2		$	(7.7	)		$	13.6
Year ended December 31, 2010
Deducted from asset accounts:
Allowance for doubtful accounts	$	10.2	$	2.7	⁽¹⁾	$	(4.6	)	⁽²⁾	$	8.3
Provision for inventory obsolescence	0.1		0.3		⁽³⁾	—				0.4
Unrealized losses on securities available for sale	3.0		—			(2.2		)	⁽¹⁰⁾	0.8
Valuation allowance for deferred tax assets	5.4		0.2		⁽⁶⁾	—				5.6
Total	$	18.7	$	3.2		$	(6.8	)		$	15.1


(1)	Provision for doubtful accounts.


(2)	Write-offs and reversals of uncollectible accounts.


(3)	Provision for inventory obsolescence.


(4)	Inventory write-offs.


(5)	The increase in unrealized gains recorded in other comprehensive income.


(6)	Increase in the foreign tax loss carryforward.


(7)	Decrease in valuation allowance for deferred tax assets is due primarily to the utilization of tax loss carryforwards and other tax benefits.


(8)	Unrealized losses and reductions to unrealized gains recorded in other comprehensive income.


(9)	Represents reversal of unrealized losses upon redemption of security.


(10)	Represents credit and other losses recognized in earnings, net of reversal of unrealized losses upon sale of securities and unrealized gains recognized in other comprehensive income.

Business, Basis of Presentation and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2012
Nature Of The Business	Nature of the Business MasTec, Inc. (collectively with its subsidiaries, “MasTec” or the “Company”) is a leading infrastructure construction company operating mainly throughout North America across a range of industries. The Company’s primary activities include the engineering, building, installation, maintenance and upgrade of energy, utility and communications infrastructure, such as: electrical utility transmission and distribution; power generation; natural gas and petroleum pipeline infrastructure; wireless, wireline and satellite communications; wind farms, solar farms and other renewable energy infrastructure; and industrial infrastructure. MasTec’s customers are primarily in these industries.
Principles Of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include MasTec, Inc. and its subsidiaries and include the accounts of all majority-owned subsidiaries over which the Company exercises control and, when applicable, entities in which the Company has a controlling financial interest. Other parties’ interests in companies for which MasTec exercises control and has a controlling financial interest are reported as non-controlling interests within shareholders’ equity. Net income or loss attributable to non-controlling interests is reported as a separate line item below net income. The Company’s investments in entities in which the Company does not have a controlling interest, but has the ability to exert significant influence, are accounted for using the equity method of accounting. Equity method investments are recorded as long-term assets in the consolidated balance sheets. Income or loss from these investments is recorded in other income or expense, net, in the consolidated statements of operations. The cost method is used for investments in entities in which the Company does not have the ability to exert significant influence. All significant intercompany balances and transactions have been eliminated in consolidation.
Management Estimates	Management Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Key estimates include: the recognition of revenue, in particular, on long-term construction contracts, including estimates to complete and provisions for contract losses; allowances for doubtful accounts; accrued self-insured claims; estimated fair values of goodwill and intangible assets, acquisition-related contingent consideration, assets and liabilities classified as held-for-sale, investments in equity method investees, securities available for sale and certain convertible debt obligations; asset lives used in computing depreciation and amortization, including amortization of intangible assets; accounting for income taxes; and the estimated impact of contingencies and ongoing litigation. While management believes that such estimates are fair when considered in conjunction with the consolidated financial position and results of operations taken as a whole, actual results could differ from those estimates and such differences may be material to the consolidated financial statements.
Significant Accounting Policies	Significant Accounting Policies The following is a summary of significant accounting policies followed in the preparation of the accompanying consolidated financial statements.
Discontinued Operations	Discontinued Operations In determining whether a group of assets to be disposed of should be presented as a discontinued operation, the Company makes a determination as to whether such assets comprise a component of the entity, which includes an assessment as to whether it has historic operations and cash flows that can be clearly distinguished. The Company also determines whether the cash flows associated with the group of assets will be significantly eliminated from the ongoing operations of the Company as a result of the disposal transaction and whether the Company will have no significant continuing involvement in the operations of the disposed assets after the disposal transaction. If management believes these conditions exist, then the assets and liabilities and results of operations of the assets to be disposed, as well as any estimated gain or loss on the disposal transaction, are aggregated for presentation separately from the financial position and operating results of the Company's continuing operations. For those businesses for which management has committed to a plan of sale, the business is valued at the lower of its carrying amount or estimated fair value less costs to sell. If the carrying amount of the business exceeds its estimated fair value, an impairment loss is recognized. Estimated fair value is determined using management estimates and entity-specific assumptions. Management considers historical experience and all available information at the time such estimates are made; however, the fair value that is ultimately recognized upon sale of the related business may differ from the estimated fair value as reflected in the consolidated financial statements. Depreciation and amortization expense is not recorded on assets of a business to be sold once that business has been classified as held for sale.
Translation Of Foreign Currencies	Translation of Foreign Currencies The assets and liabilities of foreign subsidiaries are translated into U.S. dollars at period-end exchange rates, with resulting translation gains or losses accumulated within other comprehensive income. Revenue and expenses are translated into U.S. dollars at average rates of exchange prevailing during the period. Gains or losses resulting from transactions executed in a foreign currency are included in other income or expense, net. The Company does not currently have any subsidiaries that operate in highly inflationary environments.
Reclassifications	Reclassifications Certain prior year amounts have been reclassified to conform to the current period presentation.
Comprehensive Income	Comprehensive Income Comprehensive income is a measure of net income and all other changes in equity that result from transactions other than those with shareholders. Comprehensive income consists of net income, foreign currency translation adjustments, unrealized gains and losses from securities available for sale, and losses from non-controlling interests. See consolidated statements of comprehensive income for details. Accumulated other comprehensive losses of $5.5 million and $7.9 million as of December 31, 2012 and 2011, respectively, are primarily attributable to unrealized losses on securities available for sale, net of tax, and foreign currency translation losses and/or gains.
Revenue Recognition	Revenue Recognition Revenues are derived from projects performed under master and other service agreements, as well as from fixed price contracts for specific projects or jobs requiring the construction and installation of an entire infrastructure system or specified units within an entire infrastructure system. The Company frequently provides maintenance, installation and repair work under unit price or fixed price master service or other service agreements that are renewed on a periodic basis. Revenue and related costs for master and other service agreements billed on a time and materials basis are recognized as the services are rendered. Services are also performed under master and other service agreements billed on a fixed fee basis. Under fixed fee master service and similar type service agreements, MasTec furnishes various specified units of service for a separate fixed price per unit of service. Revenues from fixed price contracts are recognized using the percentage-of-completion method, measured by the percentage of costs incurred to date to total estimated costs for each contract. These contracts provide for a fixed amount of revenues for the entire project. Contract costs include all direct materials, labor and subcontracted costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and the operational costs of capital equipment (excluding depreciation). Much of the materials associated with the Company’s work are customer-furnished and are therefore not included in contract revenues and costs. The cost estimation process is based on the professional knowledge and experience of the Company’s engineers, project managers and financial professionals. Changes in job performance, job conditions and final contract settlements are factors that influence management’s assessment of total contract value and the total estimated costs to complete those contracts and therefore, the Company’s profit recognition. Changes in these factors may result in revisions to costs and income, and their effects are recognized in the period in which the revisions are determined. Provisions for losses on uncompleted contracts are made in the period in which such losses are determined to be probable and the amount can be reasonably estimated. A substantial majority of the Company's fixed price projects are completed within one year. The Company may incur costs subject to change orders, whether approved or unapproved by the customer, and/or claims related to certain contracts. Management determines the probability that such costs will be recovered based upon evidence such as engineering studies and legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer. The Company treats project costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defers costs and/or recognizes revenue up to the amount of the related cost if it is probable that the contract price will be adjusted and can be reliably estimated. Billings in excess of costs and estimated earnings on uncompleted contracts are classified as current liabilities. Costs and estimated earnings in excess of billings, or work in process, is classified within current assets for the majority of the Company’s projects. Work in process on contracts is based on work performed but not yet billed to customers as per individual contract terms.
Allowance For Doubtful Accounts	Allowance for Doubtful Accounts The Company maintains an allowance for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments. Management analyzes the collectibility of accounts receivable and the adequacy of the allowance for doubtful accounts on a regular basis, based on the aging of account balances, historical bad debt experience, customer concentrations, customer credit-worthiness, customer financial condition and credit reports, availability of mechanics’ and other liens, existence of payment bonds and other sources of payment and current economic trends. For reporting units where losses have occurred historically and are considered to be ordinary course, reserves are established for anticipated losses based on an analysis of the accounts receivable portfolio. For reporting units where historical losses have been immaterial, an increase in the allowance for doubtful accounts is recorded when it is probable a receivable is not collectible and the loss can be reasonably estimated. Amounts are written off against the allowance when deemed uncollectible.
Cash And Cash Equivalents	Cash and Cash Equivalents All short-term highly liquid investments with original maturities of three months or less are considered to be cash equivalents and are stated at cost, which approximates market value. Cash Overdrafts. On a daily basis, available funds are swept from the Company’s depository accounts into a concentration account and are used to repay debt under the Company’s Credit Facility. Cash overdrafts principally represent the balance of outstanding checks that have not yet cleared through the banking system. Other cash balances maintained by certain operating subsidiaries, which are not swept into the concentration account, as well as deposits made subsequent to the daily cash sweep, are classified as cash. The Company generally does not fund its disbursement accounts for checks it has written until the checks are presented to the bank for payment. Cash overdrafts are classified within accounts payable. There are no compensating balance requirements associated with the Company’s depository accounts and there are no other restrictions on the transfer of cash associated with the Company’s depository accounts. As of December 31, 2012 and 2011, cash overdrafts totaled $15.0 million and $14.9 million, respectively.
Fair Value Of Financial Instruments	Fair Value of Financial Instruments The Company’s financial instruments include cash and cash equivalents, accounts and notes receivable, cash collateral deposited with insurance carriers, cash surrender value of life insurance policies, auction rate securities, cost and equity method investments, deferred compensation plan assets and liabilities, accounts payable and other current liabilities, acquisition-related contingent consideration and debt obligations. Fair value is the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value guidance establishes a valuation hierarchy, which requires maximizing the use of observable inputs when measuring fair value. The three levels of inputs that may be used are: Level 1 - Quoted market prices in active markets for identical assets or liabilities. Level 2 - Observable market based inputs or other observable inputs. Level 3 - Significant unobservable inputs that cannot be corroborated by observable market data. These values are generally determined using valuation models incorporating management’s estimates of market participant assumptions. Fair values of financial instruments are estimated through the use of public market prices, quotes from financial institutions and other available information. Due to their short-term maturity, the carrying amounts of cash and cash equivalents, accounts and notes receivable and accounts payable and other current liabilities approximate their fair values. Management believes the carrying values of cash collateral deposited with insurance carriers, deferred compensation plan assets and liabilities and outstanding balances on the Company’s credit facility approximate their fair values. Cost and equity method investments are initially recorded at their cost basis. The fair value of the Company’s cost and equity method investments are not readily available, however, disclosure of their fair value is not required. Management is not aware of events or changes in circumstances that would have a material adverse effect on the carrying value of the Company’s cost or equity method investments. See Note 6 – Fair Value of Financial Instruments for estimated fair values and carrying amounts of the Company’s other financial instruments.
Securities Available-for Sale	Securities Available for Sale The Company’s securities available for sale consist of auction-rate securities, which represent interests in pools of student loans guaranteed by the U.S. government under the Federal Family Education Loan Program and a structured finance security. The structured finance security has an attached credit default swap under which the principal value of the structured finance security would be partially or fully forfeited at net default rates on the underlying corporate debt obligations ranging from 8% to 9% . The net default rate as of December 31, 2012 was estimated to be 6.22%. Both the structured finance security and the credit default swap are collateralized by investment grade credit-linked notes made up of floating rate international bank notes. Liquidity for auction rate securities was originally provided by an auction process that would provide for liquidation or reset the applicable interest rate at pre-determined intervals, usually every 7, 28 or 35 days. Due to disruptions in the credit markets beginning in 2008, these auctions have not had sufficient bidders to allow investors to complete a sale, indicating that liquidity at its par value is unavailable. Due to the failed auction process, there was insufficient observable market data to determine the fair value of the Company’s auction rate securities as of either December 31, 2012 or 2011. Therefore, their respective fair values were estimated by an independent valuation firm, Houlihan Capital Advisors, LLC ("Houlihan"), using a probability-weighted discounted cash flow model. The model incorporates assumptions that market participants would use in their estimates of fair value, such as reset interest rates, final stated maturities, collateral values, credit quality and insurance, and applies the probabilities of either (a) a successful auction; (b) a failed auction; or (c) a default; at each auction. The valuation of these securities is sensitive to market conditions and managements' judgment and can change significantly based on the assumptions used. Factors that may impact the valuation include: changes to credit ratings of the securities and, for the structured finance security, changes to the credit ratings of the underlying assets supporting the security as well as rates of default of the underlying assets, underlying collateral values, discount rates, counterparty risk and ongoing strength and quality of market credit and liquidity. As a result, these securities have been recorded as long-term assets at their estimated fair values in the consolidated financial statements. Fair values are reevaluated quarterly. Temporary unrealized holding gains and losses are recorded as a separate component of accumulated other comprehensive income (loss), net of applicable income taxes. Unrealized losses are charged against earnings when a decline in fair value is determined to be other-than-temporary. An impairment is considered to be other-than-temporary if an entity: (i) intends to sell a security, (ii) more likely than not will be required to sell a security before recovering its cost, or (iii) does not expect to recover a security’s entire amortized cost basis, even if there is no intent to sell the security. The Company considers several factors in assessing whether a loss is other-than-temporary. These factors include, but are not limited to: intent to hold a security; that it is not more likely than not that the Company will be required to sell a security before recovery of its cost basis; the length of time a security is in an unrealized loss position; the extent to which fair value is less than cost; the financial condition and near term prospects of the issuer; changes to the credit ratings of securities, as well as their underlying assets; and, for the Company’s structured finance security, rates of default on the loan portfolio underlying the credit default swaps. In assessing the expectation of recovering a security’s amortized cost basis, management performs an assessment of the present value of cash flows expected to be collected. If this assessment yields an amount less than the amortized cost basis of the security, even if the Company has the intent, and more likely than not, the ability to hold the securities, a credit loss is deemed to exist. The amount of an other-than-temporary impairment attributed to the credit losses is recognized in earnings, while the amount of an other-than-temporary impairment related to other factors is recognized in other comprehensive income, net of applicable deferred income taxes. The Company estimates credit losses associated with its auction rate securities using Level 3 inputs. Credit loss estimates are derived by comparing the estimated fair value of the securities, which are based on a number of factors, including estimated probabilities of default, with the value that would have been derived if the probability of default for the same securities were zero percent. The difference between the recorded fair value and the estimated fair value assuming a zero probability of default is considered the portion of total decline in fair value attributable to credit losses. See Note 7 – Securities Available for Sale.
Inventories	Inventories Inventories consist of materials and supplies for construction and install to the home projects. Inventories are valued at the lower of cost (using the specific identification method) or market. Construction projects are completed pursuant to customer specifications. For materials or supplies purchased on behalf of specific customers or projects, loss of the customer or cancellation of the project could result in an impairment of the value of materials purchased. Technological or market changes can also render certain materials obsolete. Allowances for inventory obsolescence are determined based upon the specific facts and circumstances and market conditions. As of December 31, 2012 and 2011, inventory obsolescence reserves were $2.0 million and $2.2 million, respectively.
Deferred Financing Costs	Deferred Financing Costs Deferred financing costs related to the Company’s credit facility, senior notes and senior convertible notes, whose short and long-term portions are included in other current and non-current assets in the consolidated balance sheets, are amortized over the related terms of the debt using the effective interest method. Net deferred financing costs were $9.9 million and $13.5 million at December 31, 2012 and 2011, respectively.
Software Capitalization	Software Capitalization The Company capitalizes certain costs incurred in connection with developing or obtaining internal use software. These capitalized software costs are included in property and equipment, net, in the consolidated balance sheets and are amortized over a period not to exceed seven years .
Business Combination-Valuation Of Acquired Assets And Liabilities	Business Combinations – Valuation of Acquired Assets and Liabilities Assumed The Company allocates the purchase price for each business combination, or acquired business, based upon (i) the fair value of the consideration paid and (ii) the fair value of net assets acquired. The determination of the fair value of net assets acquired requires estimates and judgments of future cash flow expectations for the acquired business and the allocation of those cash flows to identifiable tangible and intangible assets. Fair values are calculated by incorporating expected cash flows into industry standard valuation techniques. For current assets and current liabilities, the book value is generally assumed to equal the fair value. Goodwill is the amount by which the purchase price consideration exceeds the fair value of tangible and intangible assets, less assumed liabilities. To the extent possible, goodwill should be allocated to separate identifiable intangible assets, such as customer relationships and trade names, which are amortized to expense over their estimated useful lives. Goodwill and indefinite-lived intangible assets are not amortized, but are tested for impairment annually and, if impaired, their value is reduced to fair value. Acquisition costs are expensed as incurred. Consideration paid generally consists of cash, common stock, and additional cash or common stock payments which are contingent on the acquired business achieving certain levels of earnings (referred to as “contingent consideration” or “earnouts”). The fair value of cash and MasTec common stock is generally based upon the amount tendered or the market price on the closing date, respectively. A liability for contingent consideration based on earnings is measured at its estimated fair value as of the date of acquisition, with subsequent changes in fair value recorded in earnings as a gain or loss. Fair value is estimated as of the acquisition closing date utilizing calculated earnout payments that would be made as if managements' best estimate of possible cash flows of the acquired business was accurate. Thus, if actual earnout payments are expected to exceed estimated earnout payments (as a result of higher than expected acquired business cash flows), then a loss would be recognized in the period in which that expectation is considered probable. Conversely, if actual earnout payments are expected to fall below estimated earnout payments, a gain would be recognized in the period that expectation is considered probable. Due to the time required to gather and analyze the necessary data for each acquisition, U.S. GAAP provides a “measurement period” of up to one year in which to finalize such calculations. Most calculations are considered preliminary until the end of the measurement period. All subsequent adjustments to initial valuations and estimates during the measurement period that reflect newly discovered information that existed as of the acquisition date are recorded with an offsetting entry to goodwill; otherwise, those adjustments are reflected as income or expense, as appropriate. The consolidated balance sheet for the period of acquisition is modified for subsequent measurement period adjustments when that period is presented in future consolidated financial statements.
Long Lived Assets	Long-Lived Assets The Company’s long-lived assets consist primarily of property and equipment and finite-lived intangible assets. Property and equipment are recorded at cost, or if acquired in a business combination, at acquisition date fair value. Depreciation is computed using the straight-line method over the estimated useful lives of the respective assets. Leasehold improvements are depreciated over the shorter of the term of the lease or the estimated useful lives of the improvements. Property and equipment under capital leases are depreciated over their estimated useful lives. Expenditures for repairs and maintenance are charged to expense as incurred. Expenditures for betterments and major improvements are capitalized and depreciated over the remaining useful lives of the assets. The carrying amounts of assets sold or retired and related accumulated depreciation are eliminated in the year of disposal and the resulting gains and losses are included in other income or expense. Acquired intangible assets that have finite useful lives are recognized and amortized over their useful lives, which are generally based on contractual or legal rights. Management reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be realizable. If an evaluation is required, the estimated future undiscounted cash flows associated with the asset are compared to the asset’s carrying amount to determine if there has been an impairment. The amount of an impairment is calculated as the difference between the fair value of the asset and its carrying value. Estimates of future undiscounted cash flows are based on management’s view of growth rates for the related business, anticipated future economic conditions and estimates of residual values. Estimated fair values take into consideration appropriate discount rates relative to risk. Management believes that these estimates are consistent with assumptions that marketplace participants would use in their estimates of fair value. For the three years in the period ended December 31, 2012, no material impairment charges were incurred relating to the Company’s long-lived assets.
Goodwill And Indefinite-Lived Intangible Assets	Goodwill and Indefinite-Lived Intangible Assets Goodwill and certain intangible assets acquired in a business combination and determined to have indefinite useful lives are not amortized, but instead are tested for impairment at least annually. The Company performs its annual impairment review of goodwill and intangible assets with indefinite lives during the fourth quarter each year at the reporting unit level. Each of the Company's reporting units comprises one component of one of its five reportable segments. Management identifies its reporting units by assessing whether components have discrete financial information available and whether a segment manager regularly reviews the operating results of that component. Net assets of acquired businesses and related goodwill are allocated to the corresponding reporting unit upon acquisition, based upon the Company's expected organizational structure. If two or more components are deemed economically similar, those components are aggregated into one reporting unit for purposes of the annual goodwill impairment review. None of the Company's components are aggregated for annual impairment testing. Under Accounting Standards Update (“ASU”) 2011-08, Intangibles – Goodwill and Other (Topic 350): Testing Goodwill for Impairment ("ASU 2011-08"), which the Company adopted for the year ended December 31, 2011, and ASU 2012-02 Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment (“ASU 2012-02”), which the Company adopted for the year ended December 31, 2012, a full quantitative analysis is not required if the Company's qualitative analysis concludes that it is more likely than not that the fair value of the Company's reporting units or indefinite-lived intangible assets are greater than their carrying amounts. During the years ended December 31, 2012 and 2011, the Company assessed qualitative factors to determine whether it was more likely than not that the fair values of the Company’s reporting units were less than their carrying amounts as a basis for determining whether it was necessary to perform the traditional two-step quantitative goodwill impairment test. During the year ended December 31, 2010, management estimated the fair values of the Company’s reporting units to determine if their carrying values exceeded their estimated fair values using a discounted cash flow methodology, which incorporated management estimates, including estimates of future cash flows and growth rates, as well as the selection of a discount rate. Based upon the results of these analyses, the estimated fair values of the Company's reporting units for its continuing operations businesses were determined to substantially exceed their carrying values. In September 2012, MasTec's board of directors approved a plan of sale for its Globetec business. In connection with its decision to sell Globetec, the Company recognized impairment losses of $12.7 million, including $6.4 million of goodwill impairment charges, during the third quarter of 2012. During the year ended December 31, 2012, the Company also assessed qualitative factors to determine if it was more likely than not that the fair values of its indefinite-lived intangible assets were less than their carrying amounts. For the years ended December 31, 2011 and 2010, management estimated the fair values of its indefinite-lived intangible assets based on estimates of growth rates for the related businesses and estimated future economic conditions. Based upon the results of its analysis, no impairment charges related to the Company's indefinite-lived intangible assets for its continuing operations businesses were recorded during the three years in the period ended December 31, 2012. See Note 4 - Discontinued Operations for details of the Globetec discontinued operation and Note 5 – Goodwill and Other Intangible Assets.
Self-Insurance	Self-Insurance MasTec maintains insurance policies subject to per claim deductibles of $1 million for its workers’ compensation policy, $2 million for its general liability policy and $2 million for its automobile liability policy. The Company has excess umbrella coverage up to $100 million per claim and in the aggregate. Liabilities under these insurance programs are accrued based upon management’s estimates of the ultimate liability for claims reported and an estimate of claims incurred but not reported with assistance from third-party actuaries. MasTec also maintains an insurance policy with respect to employee group health claims, which is subject to annual per employee maximum losses of $0.4 million. MasTec’s liability for employee group claims is based on statistical analysis of historical claims experience and specific knowledge of actual losses that have occurred. The present value of the Company’s self-insurance liabilities are reflected in the consolidated balance sheets as current and other non-current liabilities. The determination of such claims and expenses and the appropriateness of the related liability is reviewed and updated quarterly, however, these insurance liabilities are difficult to assess and estimate due to unknown factors, including the severity of an injury, the determination of the Company’s liability in proportion to other parties and the number of incidents not reported. Accruals are based upon known facts and historical trends and management believes such accruals to be adequate. However, a change in experience or actuarial assumptions could materially affect results of operations in a particular period. The Company is required to post letters of credit and provide cash collateral to certain of its insurance carriers and to obtain surety bonds in certain states in which the Company is self-insured. In addition, the Company has certain cash collateral deposited with insurance carriers, which is included in other long-term assets in the consolidated balance sheets.
Income Taxes	Income Taxes The Company records income taxes using the asset and liability method of accounting for deferred income taxes. Under this method, deferred tax assets and liabilities are recognized for the expected future tax consequence of temporary differences between the financial statement and income tax basis of the Company’s assets and liabilities. Income taxes are estimated in each of the jurisdictions in which the Company operates. This process involves estimating the tax exposure together with assessing temporary differences resulting from differing treatment of items, such as deferred revenue, for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included within the consolidated balance sheets. The recording of a deferred tax asset assumes the realization of such asset in the future. Otherwise, a valuation allowance must be recorded to reduce this asset to its estimated net realizable value. Management considers future pretax income and ongoing prudent and feasible tax planning strategies in assessing the estimated net realizable value of tax assets and the need for a valuation allowance. If management determines that the Company may not be able to realize all or part of a deferred tax asset in the future, a valuation allowance for the deferred tax asset is charged to income tax expense in the period such determination is made. In determining the provision for income taxes, management uses an effective tax rate based on annual pre-tax income, statutory tax rates, permanent tax differences, and tax planning opportunities in the various jurisdictions in which the Company operates. Significant factors that impact the annual effective tax rate include management’s assessment of certain tax matters, the location and amount of taxable earnings, changes in certain non-deductible expenses and expected credits. The Company and its subsidiaries file income tax returns in numerous tax jurisdictions, including U.S. federal, most U.S. states and certain foreign jurisdictions. The Company’s U.S. federal income tax returns for years ending on or after December 31, 2009, and many U.S. state and local income tax returns, remain open for examination. Although management believes its calculations for tax returns are correct and the positions taken thereon are reasonable, the final outcome of tax audits could be materially different from the resolution management currently anticipates, and those differences could result in significant costs or benefits to the Company. If applicable, any interest or penalties pertaining to the Company’s income tax returns, if assessed, would be recorded within interest expense or general and administrative expense, respectively, in the consolidated statements of operations.
Stock-Based Compensation	Stock-Based Compensation The Company has granted to employees and others restricted stock and options to purchase common stock. Non-cash stock compensation expense for administrative employees is included in general and administrative expense. Share-based payments, to the extent they are compensatory, are recognized based on their grant date fair values and the estimated number of shares ultimately expected to vest. The Company records a deferred tax asset, or future tax benefit, based on the amount of share-based compensation recognized in the financial statements over the vesting period of share-based awards. If the exercise date fair value of a stock option, or the vesting date fair value of a restricted share award exceeds its grant date fair value, the tax effect of this difference (“excess tax benefit”) is recorded as an increase to additional paid-in capital (“APIC”), creating an “APIC Pool.” If the exercise date fair value of a stock option, or the vesting date fair value of a restricted share award is less than its grant date fair value, the tax effect of this difference would reduce the APIC Pool. If the APIC Pool is reduced to zero, subsequent shortfalls would increase income tax expense. Grants of restricted stock are valued based on the market price of MasTec’s common stock on the date of grant. Compensation expense arising from restricted stock grants with graded vesting is recognized using the ratable method (an accelerated method of expense recognition) over the vesting period. Those shares issued with cliff vesting are amortized on a straight line basis over the vesting period. Vesting periods for grants of restricted stock range from day of issuance to five years. For certain restricted share awards, the number of shares issued on the vesting date is net of the number of shares having the value required to satisfy the recipient’s minimum statutory tax withholding requirements. The Company then pays the corresponding withholding taxes to the appropriate taxing authorities in cash on behalf of the recipient. Although the withheld shares are not issued, they are treated as common stock repurchases in the consolidated financial statements, as they reduce the number of shares that would have been issued upon vesting. Stock option grants vest between one to five years after grant, have a term not to exceed ten years, and are generally forfeited if the holder terminates his or her employment or relationship with the Company or one of its affiliates. All option plans contain anti-dilutive provisions that require adjustment of the number of shares of common stock represented by each option for any stock splits or dividends. No stock options have been granted since 2006. For stock options granted in prior periods, the Black-Scholes valuation model was used to estimate the fair value of options to purchase MasTec’s common stock, which is no less than the fair market value of the underlying stock on the date of grant. The Company uses the ratable method to amortize compensation expense over the vesting period of the option grant. All outstanding grants were fully vested as of December 31, 2010. See Note 12 – Stock-Based Compensation and Other Employee Benefits Plans for further discussion.
Multi-Employer Pension Plans	Multi-Employer Pension Plans The Company makes contributions to certain union-administered multi-employer pension plans, which are recorded as a component of employee wages and salaries within costs of revenue, excluding depreciation and amortization. Contributions are generally based on fixed amounts per hour per employee for employees covered under these plans. To the extent that those plans are underfunded, the Employee Retirement Income Security Act of 1974, as amended by the Multi-Employer Pension Plan Amendments Act of 1980, may subject the Company to substantial liabilities if the Company withdraws from such multi-employer plans or if they are terminated. In November 2011, the Company voluntarily withdrew from one of the multi-employer pension plans in which it participated and recorded a charge of $6.4 million within costs of revenue, excluding depreciation and amortization. Withdrawal liabilities under multi-employer pension plans are based on estimates of the Company’s proportionate share of the plan’s unfunded vested liability, as calculated by the plan’s actuaries, and represent the Company’s best estimate of such liabilities as of the time they are recorded. See Note 13 – Other Retirement Plans and Note 17 – Commitments and Contingencies for additional details.
Litigation and Contingencies	Litigation and Contingencies Litigation and contingencies are reflected in the consolidated financial statements based on management's assessments, along with legal counsel, of the expected outcome of litigation proceedings or the expected resolution of the contingency. Liabilities for estimated losses are accrued if the potential loss from any claim or legal proceeding is considered probable and the amount can be reasonably estimated. Significant judgment is required in both the determination of probability and the determination as to whether the amount of an exposure is reasonably estimable. Due to uncertainties related to these matters, accruals are based only on the information available at the time. As additional information becomes available, management reassesses potential liabilities related to pending claims and litigation and may revise its previous estimates.
Treasury Stock	Treasury Stock The Company records treasury shares at cost. See Note 14 – Common Stock Activity.
Recently Issued Accounting Standards, Not Adopted as of December 31, 2012	New accounting pronouncements Recently Issued Accounting Standards, Not Adopted as of December 31, 2012 In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”). The objective of ASU 2013-02 is to improve the reporting of reclassifications out of accumulated other comprehensive income. The amendments require disclosure of information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, disclosure is required, either on the face of the statement where net income is presented or in the notes, of significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures required under U.S. GAAP that provide additional detail about those amounts. The new requirements will take effect for public companies in interim and annual reporting periods beginning after December 15, 2012. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements. Recently Adopted Accounting Pronouncements In July 2012, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2012-02 Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment (“ASU 2012-02”). ASU 2012-02 permits an entity to first assess qualitative factors to determine whether it is "more likely than not" (or a likelihood greater than 50%) that an indefinite-lived intangible asset is impaired before performing quantitative impairment testing. ASU 2012-02 is effective for fiscal years beginning after September 15, 2012, with early adoption permitted. The Company adopted ASU 2012-02 in connection with its 2012 indefinite-lived intangible asset impairment assessment. See Note 5 – Goodwill and Other Intangible Assets. In May 2011, the FASB issued ASU 2011-04, Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and International Financial Reporting Standards (“ASU 2011-04”). The objective of ASU 2011-04 is to converge guidance of the FASB and the International Accounting Standards Board on fair value measurement and disclosure. This update changes the wording used to describe many of the requirements in U.S. GAAP for measuring fair value and disclosing information about fair value measurements; clarifies the FASB’s intent about the application of existing fair value measurement requirements; and changes particular principles or requirements for measuring fair value or for disclosing information about fair value measurements. ASU 2011-04, which the Company adopted as of January 1, 2012, was effective prospectively for interim and annual periods beginning after December 15, 2011. The wording of fair value disclosures in Note 6 - Fair Value of Financial Instruments corresponds to the new requirements. In June 2011, the FASB issued ASU 2011-05, Comprehensive Income (Topic 220): Presentation of Comprehensive Income (“ASU 2011-05”). The objective of ASU 2011-05 is to improve the comparability, consistency and transparency of financial reporting and to increase the prominence of items reported in other comprehensive income. ASU 2011-05 provides the option to present the total of comprehensive income, (equal to the components of net income and the components of other comprehensive income) either in a single continuous statement of comprehensive income or in two separate but consecutive statements. ASU 2011-05 eliminates the option to present the components of other comprehensive income as part of the statement of shareholders' equity as shown in the prior years. In December 2011, the FASB issued ASU 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in ASU 2011-05 (“ASU 2011-12”), which defers the provisions in ASU 2011-05 relating to the presentation of reclassification adjustments. ASU 2011-12 reinstates the requirements for the presentation of reclassifications out of accumulated other comprehensive income that were in place before ASU 2011-05. The remaining provisions of ASU 2011-05 are effective retrospectively for annual periods, and interim periods within those years, beginning after December 15, 2011. ASU 2011-12, which the Company adopted as of January 1, 2012, is effective for reporting periods beginning after December 15, 2011. See the consolidated statements of comprehensive income for related disclosures.
Unremitted Earnings in Foreign Investment	As of December 31, 2012, the Company has not made a provision for U.S. income taxes on unremitted foreign earnings because such earnings are intended to be indefinitely reinvested outside the U.S. Generally, such amounts become subject to U.S. taxation upon the remittance of dividends and certain other circumstances.
Income Tax Uncertainties	For those tax positions where it is more likely than not that a tax benefit will be sustained, the Company has recognized the largest amount of tax benefit with a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is not more likely than not that a tax benefit will be sustained, no tax benefit has been recognized in the Company’s financial statements.
Convertible Debt [Member] \| Total New Senior Convertible Notes [Member]
Earnings Per Share Policy, Diluted	Due to the optional cash settlement feature and management’s intent to settle the principal amount thereof plus accrued interest in cash, the conversion shares underlying the outstanding principal amount of the New Notes, totaling approximately 13.0 million shares, are not required to be included in the Company’s diluted share count. If, however, the Company’s average stock price per share during the corresponding periods exceeds the $15.76 conversion price for the New 4.0% Notes or the $15.48 conversion price for the New 4.25% Notes, the weighted average of the resulting value in excess of the principal amount, converted to shares at the market price, is included in the Company’s weighted average diluted share count (“premium shares”).

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted



	Years Ended December 31,
	2012			2011		2010
Basic
Net income attributable to MasTec:
Net income from continuing operations	$	116,639		$	97,454	$	66,166
Net (loss) income from discontinued operations	(9,213		)	8,547		24,362
Basic net income attributable to MasTec	$	107,426		$	106,001	$	90,528
Weighted average shares outstanding	78,275			82,182		76,132
Basic earnings (loss) per share:
Continuing operations	$	1.49		$	1.19	$	0.87
Discontinued operations	(0.12		)	0.10		0.32
Total basic earnings per share	$	1.37		$	1.29	$	1.19
Diluted
Net income attributable to MasTec:
Basic net income from continuing operations	$	116,639		$	97,454	$	66,166
Interest expense on Original 4.0% Notes, net of tax	234			331		2,667
Interest expense on Original 4.25% Notes, net of tax	77			154		2,464
Diluted net income from continuing operations	$	116,950		$	97,939	$	71,297
Net (loss) income from discontinued operations	(9,213		)	8,547		24,362
Diluted net income attributable to MasTec	$	107,737		$	106,486	$	95,659
Shares:
Basic weighted average shares outstanding	78,275			82,182		76,132
Dilutive common stock equivalents	888			1,127		994
Dilutive premium shares, New 4.0% Notes	1,044			1,067		—
Dilutive premium shares, New 4.25% Notes	1,074			1,095		—
Dilutive shares, Original 4.0% Notes	612			862		7,297
Dilutive shares, Original 4.25% Notes	194			383		6,462
Diluted weighted average shares outstanding	82,087			86,716		90,885
Diluted earnings (loss) per share:
Continuing operations	$	1.42		$	1.13	$	0.78
Discontinued operations	(0.11		)	0.10		0.27
Total diluted earnings per share	$	1.31		$	1.23	$	1.05

Schedule of Convertible Debt, By Dilutive and Anti-Dilutive Classification



	Years Ended December 31,
	2012		2011		2010
Dilutive:
New 4.0% Notes (1)	$	105.3	$	105.3	N/A
New 4.25% Notes (1)	97.0		97.0		N/A
Original 4.0% Notes (2)	9.7		9.7		115.0
Original 4.25% Notes (2)	3.0		3.0		100.0
Total principal amount, dilutive outstanding convertible notes	$	215.0	$	215.0	$	215.0

(1)Dilutive shares associated with the New Notes are attributable to the premium over the respective conversion prices.

(2)Dilutive shares associated with the Original Notes are attributable to the underlying principal amounts.

Schedule Of Convertible Debt Information

Details of the calculation underlying the number of premium shares included in the Company’s diluted share count for the periods indicated are as follows (in thousands, except per share amounts):



	As of and for the Year Ended December 31, 2012				As of and for the Year Ended December 31, 2011
	New 4.0% Notes		New 4.25% Notes		New 4.0% Notes		New 4.25% Notes
Principal amount	$	105,322	$	97,000	$	105,322	$	97,000
Conversion price per share	$	15.76	$	15.48	$	15.76	$	15.48
Number of conversion shares, principal amount	6,683		6,268		6,683		6,268
Weighted average actual per share price	$	18.68	$	18.68	$	18.90	$	18.88
Excess over principal amount	$	19,494	$	20,064	$	20,968	$	21,139
Weighted average equivalent premium shares	1,044		1,074		1,067		1,095

Acquisitions and Other Investments (Tables)

12 Months Ended

Dec. 31, 2012

2011 Acquisitions [Member]

Business Acquisition, Pro Forma Information



	Year Ended December 31,
	2011		2010
	(unaudited, in millions)
Revenue	$	3,115.6	$	2,506.0
Net income	$	105.5	$	85.6

Bottom Line Services [Member]

Schedule of Business Acquisitions, Consideration Paid and Purchase Price Allocation



	December 1, 2012
Purchase price consideration:
Cash	$	67.6
Fair value of contingent consideration (earn-out liability)	11.1
Total consideration transferred	$	78.7
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Current assets	$	36.4
Property and equipment	12.6
Trade name	2.6
Non-compete agreements	0.5
Customer relationships	24.4
Current liabilities	(10.4		)
Total identifiable net assets	$	66.1
Goodwill	$	12.6
Total consideration allocated	$	78.7

2012 Acquisitions [Member]

Business Acquisition, Pro Forma Information



	Year Ended December 31,
	2012		2011
	(unaudited, in millions)
Revenue	$	3,879.1	$	2,931.1
Net income	$	119.4	$	112.3

EC Source [Member]

Schedule of Business Acquisitions, Consideration Paid and Purchase Price Allocation

The following table summarizes the estimated fair value of consideration paid and the allocation of purchase price as of date of acquisition (in millions):



	May 2, 2011
Purchase price consideration:
Shares transferred	$	94.2
Cash	0.3
Fair value of contingent consideration (earn-out liability)	25.0
Total consideration transferred	$	119.5
Fair value of equity investment	$	39.6
Fair value of total consideration	$	159.1
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Current assets	21.0
Property and equipment	10.1
Pre-qualifications	31.3
Backlog	11.0
Non-compete agreements	1.5
Current liabilities	(13.4		)
Debt	(8.6		)
Deferred income taxes	(14.5		)
Total identifiable net assets	$	38.4
Goodwill	$	120.7
Total consideration allocated	$	159.1

Fabcor [Member]

Schedule of Business Acquisitions, Consideration Paid and Purchase Price Allocation

The following table summarizes the estimated fair value of consideration paid and the allocation of purchase price as of the date of acquisition (in millions):



	April 1, 2011
Purchase price consideration:
Cash	$	24.2
Fair value of contingent consideration (earn-out liability)	16.9
Total consideration transferred	$	41.1
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Current assets	$	24.3
Property and equipment	12.8
Trade names	0.7
Non-compete agreements	0.1
Customer relationships	3.1
Backlog	0.4
Current liabilities	(24.1		)
Deferred income taxes and other liabilities	(4.3		)
Total identifiable net assets	$	13.0
Goodwill	$	28.1
Total consideration allocated	$	41.1

Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate.

Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1486-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph F4
-Subparagraph e
-Appendix F

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 52
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2012

DirectStar [Member]

Summary of Assets, Liabilities and Results of Operations from Discontinued Operations

The following is a summary of assets and liabilities associated with the DirectStar Business as of the dates indicated (in millions):



	May 31, 2012		December 31, 2011
Assets:
Current assets	$	12.0	$	9.8
Property and equipment, net	1.2		1.4
Goodwill and other intangible assets, net	104.0		101.2
Assets of discontinued operations	$	117.2	$	112.4
Liabilities:
Accounts payable and accrued expenses	$	10.6	$	9.6
Other current liabilities, including accrued earn-outs	7.4		10.6
Liabilities of discontinued operations	$	18.0	$	20.2

Results from discontinued operations associated with the DirectStar Business for the periods indicated were as follows (in millions):



	For the Years Ended December 31,
	2012			2011			2010
Revenue	$	60.2		$	148.5		$	143.3
Income from operations before provision for income taxes	6.2			22.1			42.9
Loss on disposal before provision for income taxes	(0.2		)	—			—
Provision for income taxes	$	(2.3	)	$	(8.4	)	$	(16.3	)
Net income from discontinued operations	$	3.7		$	13.7		$	26.6

Globetec [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Summary of Assets, Liabilities and Results of Operations from Discontinued Operations

The following is a summary of assets and liabilities associated with the Globetec operation as of the dates as indicated (in millions):



	December 31, 2012		December 31, 2011
Assets:
Current assets	$	18.6	$	20.8
Property and equipment, net	2.0		2.2
Goodwill and other intangible assets, net	—		6.4
Other long-term assets	5.7		10.5
Assets of discontinued operations	$	26.3	$	39.9
Liabilities:
Accounts payable and accrued expenses	$	0.9	$	6.1
Other current liabilities	3.7		3.0
Liabilities of discontinued operations	$	4.6	$	9.1

Results from discontinued operations associated with Globetec for the periods indicated were as follows (in millions):



	For the Years Ended December 31,
	2012			2011			2010
Revenue	$	18.8		$	29.2		$	21.7
Loss from operations before benefit from income taxes	(7.0		)	(7.4		)	(3.0		)
Impairment of assets, disposal group, before benefit from income taxes	(12.7		)	—			—
Benefit from income taxes	$	6.8		$	2.2		$	0.7
Net loss from discontinued operations	$	(12.9	)	$	(5.2	)	$	(2.3	)

Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the classification and carrying value of the assets and liabilities comprising the disposal group, and the segment in which the disposal group was reported. Also may include the amount of adjustments to amounts previously reported in discontinued operations such as resolution of contingencies arising from the disposal transaction or the operations of the component prior to disposal.

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Goodwill and Other Intangible Assets

The following table sets forth information for the Company’s goodwill and intangible assets as of the dates indicated (in millions):



	December 31, 2012			Weighted Average Amortization Period	December 31, 2011			Weighted Average Amortization Period
Amortizing intangible assets:⁽¹⁾
Gross carrying amount	$	129.4			$	95.8
Less: accumulated amortization	(58.5		)		(51.3		)
Amortizing intangible assets, net	$	70.9		12 years	$	44.5		14 years
Non-amortizing intangible assets:
Trade names	$	34.9			$	34.9
Pre-qualifications	31.3				31.3
Non-amortizing intangible assets	66.2				66.2
Goodwill	$	820.3			$	714.8
Goodwill and other intangible assets	$	957.4			$	825.5

(1)Consists principally of customer relationships, backlog, trade names and non-compete agreements with finite lives.

See Note 4 - Discontinued Operations for information pertaining to goodwill and other intangible assets of discontinued operations.

Rollforward of Goodwill and Other Intangible Assets

The following table provides a reconciliation of changes in goodwill and other intangible assets for the years indicated (in millions):



				Other Intangible Assets
	Goodwill			Non-amortizing		Amortizing			Total
Balance as of December 31, 2010	$	525.6		$	34.9	$	36.0		$	596.5
Additions from new business combinations	177.4			31.3		22.4			$	231.1
Accruals of acquisition-related contingent consideration ^(a)	11.8								$	11.8
Amortization expense						(13.9		)	$	(13.9	)
Balance as of December 31, 2011	$	714.8		$	66.2	$	44.5		$	825.5
Additions from new business combinations	80.2			—		38.6			$	118.8
Accruals of acquisition-related contingent consideration ^(a)	25.5								$	25.5
Amortization expense						(12.2		)	$	(12.2	)
Currency translation	(0.2		)	—		—			$	(0.2	)
Balance as of December 31, 2012	$	820.3		$	66.2	$	70.9		$	957.4


(a)	Represents contingent consideration for acquisitions prior to January 1, 2009, which is only accrued as earned, in accordance with U.S. GAAP.

Rollforward of Goodwill by Segment

The following table provides a reconciliation of changes in goodwill by reportable segment for the years indicated (in millions):



	Communications		Electrical Transmission		Oil & Gas			Power Generation & Industrial		Total Goodwill
Balance as of December 31, 2010	$	227.9	$	8.8	$	171.4		$	117.5	$	525.6
Additions from new business combinations	28.6		120.7		28.1			—		$	177.4
Accruals of acquisition-related contingent consideration^(a)	1.5		—		10.3			—		$	11.8
Balance as of December 31, 2011	$	258.0	$	129.5	$	209.8		$	117.5	$	714.8
Additions from new business combinations	36.5		—		43.7			—		$	80.2
Accruals of acquisition-related contingent consideration ^(a)	7.7		—		17.8			—		$	25.5
Currency translation	—		—		(0.2		)	—		$	(0.2	)
Balance as of December 31, 2012	$	302.2	$	129.5	$	271.1		$	117.5	$	820.3


(a)	Represents contingent consideration for acquisitions prior to January 1, 2009, which is only accrued as earned, in accordance with U.S. GAAP.

See Note 16 - Segments and Operations by Geographic Area for details pertaining to the Company's reportable segments.

Schedule of Future Amortization Expense for Amortizing Assets



	Amortization Expense
2013	$	16.4
2014	11.8
2015	9.0
2016	6.9
2017	5.3
Thereafter	21.5
Total	$	70.9

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments

Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Carrying amounts and estimated fair values of financial instruments as of the dates indicated were as follows (in millions):



	December 31, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets
Cash surrender value of life insurance policies	$	11.9	$	11.9	$	10.6	$	10.6
Auction rate securities	14.4		14.4		13.6		13.6

Liabilities
Deferred compensation plan liabilities	$	3.3	$	3.3	$	2.2	$	2.2
Acquisition-related contingent consideration	143.6		143.6		80.5		80.5
7.625% senior notes	150.0		154.9		150.0		156.4
Original 4.0% Notes	9.7		15.9		9.7		12.5
Original 4.25% Notes	3.0		5.1		3.0		4.0
New 4.0% Notes	100.9		101.5		98.2		99.4
New 4.25% Notes	92.1		92.7		89.9		91.1

Schedule Of Fair Values Of Financial Assets And Liabilities Measured On Recurring Basis

The fair values of financial assets and liabilities measured on a recurring basis were determined using the following inputs as of the dates indicated (in millions):



			Fair Value Measurements Using Inputs Considered as Significant
	Fair Value as of December 31, 2012		Level 1		Level 2	Level 3
Assets
Cash surrender value of life insurance policies	$	11.9	$	11.9	—	—
Auction rate securities	$	14.4	—		—	$	14.4

Liabilities
Deferred compensation plan liabilities	$	3.3	$	3.3	—	—
Acquisition-related contingent consideration	$	143.6	—		—	$	143.6

			Fair Value Measurements Using Inputs Considered as Significant
	Fair Value as of December 31, 2011		Level 1		Level 2	Level 3
Assets
Cash surrender value of life insurance policies	$	10.6	$	10.6	—	—
Auction rate securities	$	13.6	—		—	$	13.6

Liabilities
Deferred compensation plan liabilities	$	2.2	$	2.2	—	—
Acquisition-related contingent consideration	$	80.5	—		—	$	80.5

Reconciliation Of Assets And Liabilities Measured At Fair Value On Recurring Basis, Level 3



	Auction Rate Securities
Assets	Student Loan			Structured Finance Securities			Total
Balances as of December 31, 2010	$	16.4		$	2.6		$	19.0
Redemption or sale of securities, cost basis	(4.6		)	—			(4.6		)
Reversal of unrealized losses on redeemed or sold securities	0.5			—			0.5
Changes in fair value recorded in earnings	—			(0.6		)	(0.6		)
Changes in unrealized (losses) gains included in other comprehensive income	(0.4		)	(0.3		)	(0.7		)
Balances as of December 31, 2011	$	11.9		$	1.7		$	13.6
Changes in fair value recorded in earnings	—			—			—
Changes in unrealized (losses) gains included in other comprehensive income	(0.2		)	1.0			0.8
Balances as of December 31, 2012	$	11.7		$	2.7		$	14.4

Liabilities	Acquisition-Related Contingent Consideration
Balance as of December 31, 2010	$	45.0
Additions from new business combinations	47.7
Payments of contingent consideration	(12.2		)
Balance as of December 31, 2011	$	80.5
Additions from new business combinations	66.7
Payments of contingent consideration	(3.6		)
Valuation gains/losses recorded in earnings	—
Balance as of December 31, 2012	$	143.6

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 19
-Subparagraph a, b, c(1), d(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 14
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15
-Subparagraph b-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 18
-Subparagraph c(2), d, e, f
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph a, c(1), c(2), c(3), d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Schedule of Available-for-sale Securities [Line Items]

Securities Available For Sale (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Of Auction Rate Securities By Security Type And Underlying Credit Rating

The following tables set forth the fair values of the Company’s auction rate securities by type of security and underlying credit rating as of the dates indicated (in millions):



	Underlying Credit Rating (1)
As of December 31, 2012	AA-		BB		CCC		Total
Student loans	$	9.1	$	2.6	$	—	$	11.7
Structured finance securities	—		—		2.7		$	2.7
Total auction rate securities	$	9.1	$	2.6	$	2.7	$	14.4



	Underlying Credit Rating (1)
As of December 31, 2011	AAA		CCC		Total
Student loans	$	11.9	$	—	$	11.9
Structured finance securities	—		1.7		$	1.7
Total auction rate securities	$	11.9	$	1.7	$	13.6


(1)	The Company’s auction rate securities maintain split ratings. For purposes of this table, securities are categorized according to their lowest rating.

Auction Rate Securities Reconciliation Of Cost Basis To Fair Value

The cost basis, gross cumulative unrealized (losses) gains and estimated fair values of the Company’s auction rate securities as of the dates indicated were as follows (in millions):



	December 31, 2012
	Adjusted Cost Basis (1)		Gross Cumulative Unrealized (Losses)/Gains			Fair Value
Auction rate securities – student loans	$	12.9	$	(1.2	)	$	11.7
Auction rate securities – structured finance securities	1.7		1.0			2.7
Total auction rate securities	$	14.6	$	(0.2	)	$	14.4

	December 31, 2011
	Adjusted Cost Basis (1)		Gross Cumulative Unrealized (Losses) Gains			Fair Value
Auction rate securities – student loans	$	12.9	$	(1.0	)	$	11.9
Auction rate securities – structured finance securities	1.7		—			1.7
Total auction rate securities	$	14.6	$	(1.0	)	$	13.6


(1)	Adjusted cost basis reflects adjustments for credit and other losses recognized in earnings on our structured finance security. Cumulative adjustments to the cost basis of securities held as of both December 31, 2012 and 2011 totaled $3.3 million. Par value of securities held as of both December 31, 2012 and 2011 totaled $17.9 million.

Collateralized Debt Obligations Sold [Member] | Auction Rate Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Other Than Temporary Losses on Auction Rate Securities Recognized in Earnings



	For the Years Ended December 31,
	2011		2010
Total other-than-temporary impairment losses on securities available for sale	$	0.6	$	1.2
Less: Unrealized losses on securities available for sale, recognized in other comprehensive income	—		—
Unrealized losses on securities available for sale, recognized in earnings	$	0.6	$	1.2

Auction Rate Securities Sold

Details of the securities sold, as of the date of sale, are as follows (in millions):



Par value	$	11.2
Cost basis	$	6.6
Fair value	$	5.7
Cumulative realized losses	$	4.2
Accumulated losses in other comprehensive income, net of tax	$	0.6

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 19, 20, 21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 17
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-1
-Paragraph 21
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Tabular disclosure of all significant concentrations of risk, including credit risk and market risk, arising from all financial instruments (as defined), whether from an individual counterparty or groups of counterparties. The disclosure concerning concentrations of risk may consist of the following information: (1) for concentrations of credit risk disclosure may include: (a) information about the (shared) activity, region, or economic characteristic that identifies the concentration, (b) the maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity, (c) the policy of requiring collateral or other security to support financial instruments subject to credit risk, information about the entity's access to that collateral or other security, and the nature and a brief description of the collateral or other security supporting those financial instruments, and (d) the policy of entering into master netting arrangements to mitigate the credit risk of financial instruments, information about the arrangements for which the entity is a party, and a brief description of the terms of those arrangements, including the extent to which they would reduce the entity's maximum amount of loss due to credit risk and (2) for disclosure of quantitative information about the market risks of financial instruments that is consistent with the way the company manages or adjusts those risks, disclosure may include: (a) more details about current positions and perhaps activity during the period, (b) the hypothetical effects on comprehensive income (or net assets), or annual income, of several possible changes in market prices, (c) a gap analysis of interest rate re-pricing or maturity dates, (d) the duration of the financial instruments, (e) the entity's value at risk from derivatives and from other positions at the end of the reporting period and the average value at risk during the year, or (f) other ways of reporting quantitative information as internally developed.

Tabular disclosure of the realized and unrealized gains and losses reported in the statement of income which have resulted from the sale and holding of marketable securities, respectively, as well as the sale or disposal of cost method investments. Such amounts would include realized gains and losses on the sale or disposal of trading, available-for-sale, and held-to-maturity securities, unrealized gains and losses on trading securities, unrealized gains and losses on available-for-sale and held-to-maturity securities transferred to the trading securities category, realized gains and losses on the sale or disposal of cost method investments, and losses recognized for other than temporary impairments (OTTI) of such investments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (c)-(e)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.M)
-URI http://asc.fasb.org/extlink&oid=6784337&loc=d3e87990-122713

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 7, 13, 16, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 21
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section M

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 5
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Accounts, Notes, Loans and Financing Receivable [Line Items]

Accounts Receivable, Net of Allowance (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Accounts Receivable And Allowance For Doubtful Accounts

Accounts receivable, net of allowance, which is classified as current, is composed of the following as of the dates indicated (in millions):



	December 31,
	2012			2011
Contract billings	$	522.0		$	395.7
Retainage	113.5			41.7
Costs and earnings in excess of billings	252.8			228.7
Accounts receivable, gross	$	888.3		$	666.1
Less allowance for doubtful accounts	(11.2		)	(7.6		)
Accounts receivable, net	$	877.1		$	658.5

Allowance for Doubtful Accounts [Member]

Accounts, Notes, Loans and Financing Receivable [Line Items]

Schedule Of Accounts Receivable And Allowance For Doubtful Accounts



	Years Ended December 31,
	2012			2011
Allowance for doubtful accounts at beginning of year	$	7.6		$	8.3
Provision for doubtful accounts	6.9			2.0
Amounts charged against the allowance	(3.3		)	(2.7		)
Allowance for doubtful accounts at end of year	$	11.2		$	7.6

Debt (Tables)

12 Months Ended

Dec. 31, 2012

Long-term Debt, Unclassified [Abstract]

Schedule of Long Term Debt Instruments

The carrying value of debt is composed of the following as of the dates indicated (in millions):



		December 31,
Description	Maturity Date	2012			2011
Credit facility	August 22, 2016	$	134.0		$	60.0
7.625% senior notes	February 1, 2017	150.0			150.0
New 4.0% Notes, $105.3 million principal amount	June 15, 2014	100.9			98.2
New 4.25% Notes, $97.0 million principal amount	December 15, 2014	92.1			89.9
Original 4.0% Notes	June 15, 2014	9.7			9.7
Original 4.25% Notes	December 15, 2014	3.0			3.0
Capital lease obligations, weighted average interest rate of 2.9%	In installments through June 2019	79.0			40.6
Notes payable for equipment, weighted average interest rate of 4.0%	In installments through May 2018	30.2			43.4
Total debt		$	598.9		$	494.8
Less current maturities		(52.6		)	(34.1		)
Long-term debt		$	546.3		$	460.7

Schedule of Convertible Notes, Carrying Amount Details

The carrying values of the debt and equity components of the New Notes as of the dates indicated are as follows (in millions):



	December 31, 2012						December 31, 2011
	New 4.0% Senior Convertible Notes			New 4.25% Senior Convertible Notes			New 4.0% Senior Convertible Notes			New 4.25% Senior Convertible Notes
Principal amount	$	105.3		$	97.0		$	105.3		$	97.0
Unamortized debt discount and financing costs	(4.4		)	(4.9		)	(7.1		)	(7.1		)
Net carrying amount of debt component	$	100.9		$	92.1		$	98.2		$	89.9
Carrying amount of equity component	$	8.9		$	8.5		$	8.9		$	8.5

Schedule of Maturities of Debt and Capital Leases

Contractual maturities of MasTec’s debt and capital lease obligations as of December 31, 2012 were as follows (in millions):



2013	$	52.6
2014	233.9
2015	18.4
2016	141.6
2017	152.0
Thereafter	0.4
Total	$	598.9

See Note 11 – Lease Obligations for additional information.

Schedule of Interest Expense, Net, Details

Details of interest expense, net, classified within continuing operations for the periods indicated is as follows (in millions):



	Year Ended December 31,
	2012			2011			2010
Interest expense:
Contractual and other interest expense	$	27.5		$	26.1		$	26.6
Accretion of senior convertible note discount	4.9			4.2			—
Deferred financing costs and commitment fees	5.4			4.7			3.6
Total interest expense	$	37.8		$	35.0		$	30.2
Interest income	(0.4		)	(0.5		)	(1.0		)
Interest expense, net	$	37.4		$	34.5		$	29.2

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Property, Plant and Equipment [Abstract]

Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Property And Equipment, Net

Property and equipment, net, including property and equipment held under capital leases, is composed of the following as of the dates indicated (in millions):



	December 31,
	2012			2011			Estimated Useful Lives (In Years)
Land	$	4.8		$	4.7
Buildings and leasehold improvements	15.4			12.5			5 – 40
Machinery and equipment	518.3			381.6			2 – 15
Office furniture and equipment	92.8			76.9			3 – 7
Total property and equipment	$	631.3		$	475.7
Less accumulated depreciation	(280.9		)	(212.7		)
Property and equipment, net	$	350.4		$	263.0

Lease Obligations (Tables)

12 Months Ended

Dec. 31, 2012

Leases [Abstract]

Schedule of Future Minimum Lease Commitments

Minimum future lease commitments under capital leases and non-cancelable operating leases, including the effect of escalation clauses in effect as of December 31, 2012, were as follows (in millions):



	Capital Leases			Operating Leases
2013	$	31.2		$	37.2
2014	21.5			23.4
2015	16.5			14.6
2016	9.0			7.0
2017	3.6			4.0
Thereafter	0.4			0.8
Total minimum lease payments	$	82.2		$	87.0
Less amounts representing interest	(3.2		)
Total capital lease obligations, net of interest	$	79.0
Less current portion	(31.0		)
Long term portion of capital lease obligations, net of interest	$	48.0

Stock-Based Compensation and Other Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2012

Share-based Compensation [Abstract]

Summary Of Restricted Share Award Activity

Following is a summary of restricted share award activity during the years indicated:



	Restricted Shares		Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2010	1,009,777		$	9.32
Granted	364,784		17.06
Vested	(646,531	)	8.00
Canceled/forfeited	(11,250	)	9.80
Non-vested restricted shares, as of December 31, 2011	716,780		$	14.45
Granted	397,623		21.22
Vested	(347,889	)	12.68
Canceled/forfeited	(11,500	)	15.02
Non-vested restricted shares, as of December 31, 2012	755,014		$	18.82

Summary of Stock Option Activity

The following is a summary of stock option activity during the years indicated:



	Stock Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value ⁽¹⁾ (in millions)
Options outstanding as of December 31, 2010	2,588,170		$	10.27	3.87	$	11.2
Exercised	(1,132,396	)	10.25
Canceled/forfeited	(10,000	)	13.95
Options outstanding as of December 31, 2011	1,445,774		$	10.25	3.16	$	10.3
Options exercisable as of December 31, 2011	1,445,774		$	10.25	3.16	$	10.3

Options outstanding as of December 31, 2011	1,445,774		$	10.25	3.16	$	10.3
Exercised	(391,949	)	9.46
Canceled/forfeited	—		—
Options outstanding as of December 31, 2012	1,053,825		$	10.55	2.31	$	15.2
Options exercisable as of December 31, 2012	1,053,825		$	10.55	2.31	$	15.2


⁽¹⁾	Amount represents the difference between the exercise price and the market price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.

Summary Of Stock-Based Compensation Expense And Related Tax Benefits

Details of stock based compensation expense and related tax benefits for the periods indicated are as follows (in millions):



	Years Ended December 31,
	2012		2011		2010
Stock based compensation expense:
Restricted share awards	$	4.4	$	3.6	$	3.8
Stock options	—		—		0.1
Total stock based compensation expense	$	4.4	$	3.6	$	3.9
Income tax benefit from stock based compensation:
Restricted share awards	$	1.8	$	3.4	$	1.3
Stock options	0.7		2.9		(0.3		)
Total income tax benefit from stock based compensation	$	2.5	$	6.3	$	1.0
Excess tax benefit from stock based compensation:
Vested restricted shares ⁽¹⁾	$	0.1	$	2.1	$	—
Stock options exercised ⁽¹⁾	0.7		5.7		—
Total excess tax benefit from stock based compensation ⁽¹⁾	$	0.8	$	7.8	$	—


⁽¹⁾	Excess tax benefits, which represent cash flows from tax deductions in excess of compensation expense recognized for stock options exercised and vested restricted shares, are classified as financing cash flows in the Company’s consolidated statements of cash flows.

Other Retirement Plans Other Retirement Plans(Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Multiemployer Plans



	Company Contributions For the Years Ended December 31, (in millions)						Contributions Greater than 5% of Total Plan Contributions	Surcharge
Multi-employer Pension Plan	2012		2011		2010		Contributions Greater than 5% of Total Plan Contributions	Surcharge	Expiration Date of CBA
Pipeline Industry Pension Fund	$	8.9	$	6.2	$	10.3	Yes	No	05/31/2014
Central Pension Fund of the International Union of Operating Engineers and Participating Employers	6.0		4.4		4.9		No	No	01/31/2014
Laborers National Pension Fund	1.5		0.5		0.2		No	No	01/31/2014
Teamsters National Pipeline Pension Fund	1.4		—		—		(a)	(a)	01/31/2014
Eighth District Electrical Pension Fund	1.2		0.5		—		No	No	02/28/2013
West Virginia Laborers Pension Trust Fund	0.9		0.4		—		No	No	01/31/2014
Michigan Laborers Pension Fund	0.9		0.2		0.2		No	No	01/31/2014
Operating Engineers Local 324 Pension Fund	0.8		—		—		No	No	01/31/2014
New England Electrical Workers Money Purchase Plan and Trust (c) (d)	0.7		0.7		0.5		NA	NA	08/30/2012
Laborers Local Union No. 158 Pension Fund	0.6		0.7		0.4		Yes	No	01/31/2014
Laborers District Council of Western Pennsylvania Pension Fund	0.6		0.3		0.2		No	No	01/31/2014
International Brotherhood of Electrical Workers Local 1249 Pension Plan	0.6		0.3		—		No	No	05/05/2013
International Union of Operating Engineers Local 132 Pension Fund	0.5		0.3		—		No	No	01/31/2014
Operating Engineers Construction Industry and Miscellaneous Pension Fund	0.5		0.1		0.2		No	No	01/31/2014
International Union of Operating Engineers Pension Fund of Eastern Pennsylvania and Delaware	0.5		0.5		0.3		No	No	01/31/2014
Minnesota Laborers Pension Fund	0.4		0.3		1.0		No	No	01/31/2014
National Electrical Benefit Fund	0.3		0.2		0.2		No	No	05/05/2013
Southwestern Pennsylvania and Western Maryland Teamsters and Employers Pension Fund	0.3		0.1		—		No	No	01/31/2014
National Electrical Annuity Plan (c)	0.3		0.3		0.4		NA	NA	09/05/2015
Laborers Pension Trust Fund for Northern Nevada	0.2		0.8		0.4		NA	No	01/31/2014
Operating Engineers Pension Trust Fund	—		1.2		1.0		No	No	01/31/2014
Central States, Southeast and Southwest Areas Pension Plan (b)	—		0.9		0.8		No	No	01/31/2014
Western Conference of Teamsters Pension Plan	—		0.4		0.3		No	No	01/31/2014
Other funds	2.1		1.5		1.4
Total contributions	$	29.1	$	20.7	$	22.6


(a)	Information not available as of December 31, 2012. The Teamsters National Pipeline Pension Fund was established in 2012.


(b)	The Company’s subsidiary that participated in the Central States, Southeast and Southwest Areas Pension Plan voluntarily withdrew from this plan in November 2011. See additional discussion below and in Note 17 – Commitment and Contingencies.


(c)	These plans are defined contribution multi-employer pension plans; therefore, PPA zone status disclosures in table below are not applicable.


(d)	The collective bargaining agreement associated with the New England Electrical Workers Money Purchase Plan is under negotiation as of December 31, 2012.

Schedule of Costs of Multiemployer Plans

Total contributions to multi-employer pension plans, and the related number of employees covered by these plans, for the periods indicated ranged as follows (dollars in millions):



	Number of Employees		Contributions to Multi-Employer Plans (in millions)
	Low	High	Pension		Post-Retirement Benefit		Total
2012	308	2,509	$	27.9	$	1.2	$	29.1
2011	308	1,538	$	19.4	$	1.3	$	20.7
2010	254	1,111	$	21.7	$	0.9	$	22.6

Multiemployer Plans, Pension [Member]

Schedule of Multiemployer Plans

Pension Protection Act Zone Status

Multi-employer Pension Plan

EIN

Pension Plan Number

2012

As of

2011

As of

Extended

Amortization

Utilized

FIP/RP Status

Pipeline Industry Pension Fund

736146433

001

Green

12/31/2011

Green

12/31/2010

Central Pension Fund of the International Union of Operating Engineers and Participating Employers

366052390

001

Green

01/31/2012

Green

01/31/2011

Laborers National Pension Fund

751280827

001

Green

12/31/2011

Green

12/31/2010

Teamsters National Pipeline Pension Fund

461102851

001

(a)

Eighth District Electrical Pension Fund

846100393

001

Green

03/31/2012

Green

03/31/2011

Yes

Implemented

West Virginia Laborers Pension Trust Fund

556026775

001

Green

03/31/2012

Green

03/31/2011

Michigan Laborers Pension Fund

386233976

001

Green

8/31/2012

Yellow

08/31/2011

Yes

Operating Engineers Local 324 Pension Fund

381900637

001

Red

04/30/2012

Red

04/30/2011

Implemented

Laborers Local Union No. 158 Pension Fund

236580323

001

Green

12/31/2011

Green

12/31/2010

Laborers District Council of Western Pennsylvania Pension Fund

256135576

001

Red

12/31/2012

Yellow

12/31/2011

Implemented

International Brotherhood of Electrical Workers Local 1249 Pension Plan

156035161

001

Red

12/31/2011

Red

12/31/2010

Implemented

International Union of Operating Engineers Local 132 Pension Fund

556015364

001

Green

03/31/2012

Green

03/31/2011

Operating Engineers Construction Industry and Miscellaneous Pension Fund

256135579

001

Green

12/31/2011

Yellow

12/31/2010

Yes

Implemented

International Union of Operating Engineers Pension Fund of Eastern Pennsylvania and Delaware

236405239

001

Red

12/31/2012

Green

12/31/2011

Pending

Minnesota Laborers Pension Fund

416159599

001

Green

12/31/2011

Green

12/31/2010

National Electrical Benefit Fund

530181657

001

Green

12/31/2011

Green

12/31/2010

Southwestern Pennsylvania and Western Maryland Teamsters and Employers Pension Fund

251046087

001

Red

06/30/2012

Red

06/30/2011

Implemented

Laborers Pension Trust Fund for Northern Nevada

880138600

001

Green

05/31/2012

Green

05/31/2011

Operating Engineers Pension Trust Fund

946090764

001

Orange

12/31/2011

Orange

12/31/2010

Implemented

Central States, Southeast and Southwest Areas Pension Plan (b)

366044243

001

Red

12/31/2011

Red

12/31/2010

Implemented

Western Conference of Teamsters Pension Plan

916145047

001

Green

12/31/2011

Green

12/31/2010


(a)	Information not available as of December 31, 2012. The Teamsters National Pipeline Pension Fund was established in 2012.


(b)	The Company’s subsidiary that participated in the Central States, Southeast and Southwest Areas Pension Plan voluntarily withdrew from this plan in November 2011. See additional discussion below and in Note 17 – Commitment and Contingencies.

Common Stock Activity (Tables)

12 Months Ended

Dec. 31, 2012

Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]

Schedule of Share Activity

A summary of share activity for the periods indicated, which may contain slight summation differences due to rounding, is as follows (in thousands):



	Common Shares Outstanding		Treasury Shares
Balance as of December 31, 2010	78,215		—
Shares issued for stock option exercises	1,132
Shares issued for restricted stock awards	647
Other shares issued	39
Shares issued for acquisition of business	5,130
Common stock repurchases	(4,594	)	4,594
Balance as of December 31, 2011	80,569		4,594
Shares issued for stock option exercises	392
Shares issued for restricted stock awards	348
Other shares issued	13
Common stock repurchases	(4,874	)	4,874
Balance as of December 31, 2012	76,448		9,467

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Components of Income Tax Expense (Benefit)

The provision for income taxes from continuing operations for the periods indicated consists of the following (in millions):



	Year Ended December 31,
	2012			2011			2010
Current:
Federal	$	48.7		$	21.9		$	2.7
Foreign	0.3			0.1			—
State and local	12.4			1.3			3.3
	$	61.4		$	23.3		$	6.0
Deferred:
Federal	$	15.2		$	35.0		$	40.8
Foreign	1.1			(1.7		)	—
State and local, net of valuation provisions	(1.6		)	5.2			1.1
	$	14.7		$	38.5		$	41.9
Provision for income taxes	$	76.1		$	61.8		$	47.9

Schedule of Deferred Tax Assets and Liabilities

The tax effects of significant items comprising the Company’s net deferred tax liability as of the dates indicated are as follows (in millions):



	2012			2011
Deferred tax assets:
Accrued self insurance	$	22.4		$	16.3
Operating loss carryforward	10.6			11.5
Compensation and benefits	8.3			12.3
Property and equipment	7.8			7.2
Bad debts	3.9			2.5
Other	9.9			9.0
Valuation allowance	(2.0		)	(2.8		)
Total deferred tax assets	$	60.9		$	56.0

Deferred tax liabilities:
Property and equipment	$	70.4		$	61.5
Goodwill	32.8			34.6
Other intangible assets	26.7			34.3
Gain on remeasurement of equity investee	11.1			11.1
Accounts receivable retainage	16.5			11.6
Other	19.5			14.9
Total deferred tax liabilities	$	177.0		$	168.0
Net deferred tax liabilities	$	(116.1	)	$	(112.0	)

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of the U.S. statutory federal income tax rate related to pretax income from continuing operations to the effective tax rate for the years ended December 31 is as follows:



	2012		2011		2010
U.S. statutory federal rate applied to pretax income	35.0	%	35.0	%	35.0	%
State and local income taxes, net of federal benefit	3.4		3.5		3.2
Foreign tax rate differential	(0.4	)	0.1		0.1
Non-deductible expenses	2.1		1.7		3.8
Change in state tax rate	0.2		0.2		(1.0	)
Domestic production activities deduction	(1.6	)	(0.9	)	(0.1	)
Other	1.2		0.0		1.1
Change in valuation allowance for deferred tax assets	(0.4	)	(0.8	)	(0.1	)
Effective income tax rate	39.5	%	38.8	%	42.0	%

Liability [Member]

Schedule of Deferred Tax Assets and Liabilities

Total net current and noncurrent deferred tax balances included in the Company’s consolidated balance sheets as of the dates indicated are as follows (in millions):



	2012			2011
Net current deferred tax assets	$	3.3		$	10.6
Net noncurrent deferred tax liabilities	(119.4		)	(122.6		)
Net deferred tax liabilities	$	(116.1	)	$	(112.0	)

Segments and Operations by Geographic Area Segments and Operations by Geographic Area (Tables)

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

As of and for the year ended December 31, 2012:



	Communications		Oil & Gas		Electrical Transmission		Power Generation & Industrial		Other		Corporate			Eliminations			Continuing Operations for Consolidated MasTec
Revenue	$	1,772.7	$	959.0	$	312.2	$	668.1	$	16.7	$	—		$	(1.9	)	$	3,726.8
EBITDA	$	192.0	$	99.4	$	38.7	$	32.0	$	2.0	$	(42.0	)	$	—		$	322.1
Depreciation	$	27.0	$	39.6	$	6.0	$	4.1	$	0.1	$	3.0		$	—		$	79.8
Amortization	$	2.1	$	2.5	$	5.0	$	2.6	$	—	$	—		$	—		$	12.2
Total Assets	$	829.2	$	805.5	$	309.9	$	321.6	$	7.0	$	93.5		$	15.0		$	2,381.7
Capital Expenditures	$	19.2	$	40.3	$	11.5	$	5.6	$	—	$	2.9		$	—		$	79.4

As of and for the year ended December 31, 2011:



	Communications		Oil & Gas		Electrical Transmission		Power Generation & Industrial			Other		Corporate		Eliminations			Continuing Operations for Consolidated MasTec
Revenue	$	1,635.1	$	774.3	$	198.3	$	219.6		$	4.8	$	—	$	(0.8	)	$	2,831.3
EBITDA	$	154.3	$	80.1	$	28.7	$	(3.2	)	$	0.4	$	7.6	$	—		$	267.9
Depreciation	$	22.7	$	26.8	$	4.0	$	3.9		$	0.1	$	2.7	$	—		$	60.2
Amortization	$	1.8	$	4.0	$	4.4	$	3.7		$	—	$	—	$	—		$	13.9
Total Assets	$	837.1	$	494.6	$	253.7	$	269.4		$	3.8	$	94.0	$	(10.2	)	$	1,942.4
Capital Expenditures	$	23.0	$	25.7	$	9.3	$	4.6		$	—	$	8.5	$	—		$	71.0

As of and for the year ended December 31, 2010:



	Communications		Oil & Gas		Electrical Transmission			Power Generation & Industrial		Other			Corporate			Eliminations			Continuing Operations for Consolidated MasTec
Revenue	$	1,190.6	$	562.6	$	67.0		$	325.6	$	0.2		$	—		$	(3.0	)	$	2,143.0
EBITDA	$	107.9	$	111.3	$	(3.7	)	$	16.9	$	(1.0	)	$	(31.3	)	$	—		$	200.1
Depreciation	$	13.4	$	20.8	$	3.1		$	4.3	$	—		$	2.4		$	—		$	44.0
Amortization	$	0.8	$	7.2	$	0.1		$	4.6	$	—		$	0.2		$	—		$	12.9
Total Assets	$	598.3	$	392.2	$	38.5		$	283.8	$	0.9		$	204.6		$	(9.6	)	$	1,508.7
Capital Expenditures	$	11.6	$	10.5	$	—		$	3.1	$	0.1		$	2.5		$	—		$	27.8

Reconciliation of EBITDA to Consolidated Income

reconciliation of EBITDA to consolidated income from continuing operations before provision for income taxes:



	For the Years Ended December 31,
	2012			2011			2010
EBITDA	$	322.1		$	267.9		$	200.1
Less:
Interest expense, net	(37.4		)	(34.5		)	(29.2		)
Depreciation	(79.8		)	(60.2		)	(44.0		)
Amortization	(12.2		)	(13.9		)	(12.9		)
Income from continuing operations before provision for income taxes	$	192.7		$	159.3		$	114.1

Reconciliation of Assets from Segments to Consolidated Entity

A reconciliation of total assets for continuing operations to consolidated total assets as of the dates indicated is as follows:



	As of December 31,
	2012		2011		2010
Total assets for continuing operations	$	2,381.7	$	1,942.4	$	1,508.7
Current assets of discontinued operations	18.6		30.6		43.1
Long-term assets of discontinued operations	7.6		121.7		104.0
Total assets	$	2,407.9	$	2,094.7	$	1,655.8

Schedule of Significant Customers, Revenue Concentration



	2012	2011	2010
Customer:
AT&T	18%	24%	22%
DIRECTV^®	17%	20%	20%

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

Schedule of Major Customer Revenue Concentration

Concentrations of Risk (Tables)

12 Months Ended

Dec. 31, 2012

Concentration Risk [Line Items]



	2012	2011	2010
Customer:
AT&T	18%	24%	22%
DIRECTV^®	17%	20%	20%

Ten Largest Customers [Member]

Concentration Risk [Line Items]

Schedule of Major Customer Revenue Concentration

Revenue concentration information for the Company's top ten customers, as a percent of total consolidated revenue from continuing operations, is as follows:



	2012	2011	2010
Revenue from top ten customers	64%	71%	72%

Quarterly Information (Unaudited) Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information



	2012 Quarter Ended											2011 Quarter Ended
	March 31		June 30			September 30			December 31			March 31		June 30		September 30		December 31
Revenue	$	738.3	$	988.9		$	1,067.3		$	932.3		$	573.6	$	709.9	$	816.2	$	731.6
Income from continuing operations before non-controlling interests	11.7		31.2			36.1			37.6			16.3		43.4		30.8		7.0
Income (loss) from discontinued operations	2.5		(1.1		)	(9.3		)	(1.3		)	4.8		1.1		1.0		1.6
Net income attributable to MasTec	$	14.2	$	30.1		$	26.8		$	36.3		$	21.1	$	44.5	$	31.8	$	8.6
Basic earnings (loss) per share ^(a)
Continuing operations	$	0.15	$	0.39		$	0.47		$	0.50		$	0.21	$	0.52	$	0.36	$	0.08
Discontinued operations	0.03		(0.01		)	(0.12		)	(0.02		)	0.06		0.01		0.01		0.02
Total basic earnings per share	$	0.18	$	0.37		$	0.35		$	0.48		$	0.27	$	0.53	$	0.37	$	0.10
Diluted earnings (loss) per share ^(a)
Continuing operations	$	0.14	$	0.38		$	0.45		$	0.46		$	0.20	$	0.50	$	0.35	$	0.08
Discontinued operations	0.03		(0.01		)	(0.12		)	(0.02		)	0.06		0.01		0.01		0.02
Total diluted earnings per share	$	0.17	$	0.37		$	0.34		$	0.45		$	0.26	$	0.51	$	0.36	$	0.10

Supplemental Guarantor Financial Information (Tables)

12 Months Ended

Dec. 31, 2012

Text Block [Abstract]

Condensed Consolidating Balance Sheets

CONDENSED CONSOLIDATING BALANCE SHEETS

As of December 31, 2012 (in thousands)



	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Assets
Current assets	$	—	$	980,104	$	48,373		$	—		$	1,028,477
Current assets of discontinued operations	—		13,836		4,755			—			18,591
Property and equipment, net	—		338,974		11,381			—			350,355
Goodwill and other intangible assets, net	—		926,712		30,729			—			957,441
Net investments in and advances to (from) consolidated affiliates	854,993		172,534		(21,779		)	(1,005,748		)	—
Other assets	7,702		37,640		80			—			45,422
Long-term assets of discontinued operations	—		4,711		2,937			—			7,648
Total assets	$	862,695	$	2,474,511	$	76,476		$	(1,005,748	)	$	2,407,934
Liabilities and Shareholders’ Equity
Current liabilities	$	22	$	678,301	$	22,810		$	—		$	701,133
Current liabilities of discontinued operations	—		574		3,995			—			4,569
Long-term debt	—		546,262		61			—			546,323
Other liabilities	—		273,198		20,776			—			293,974
Total liabilities	$	22	$	1,498,335	$	47,642		$	—		$	1,545,999
Total shareholders’ equity	$	862,673	$	976,176	$	28,834		$	(1,005,748	)	$	861,935
Total liabilities and shareholders’ equity	$	862,695	$	2,474,511	$	76,476		$	(1,005,748	)	$	2,407,934

CONDENSED CONSOLIDATING BALANCE SHEETS

As of December 31, 2011 (in thousands)



	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Assets
Current assets	$	—	$	744,868	$	53,328		$	—		$	798,196
Current assets of discontinued operations	—		22,572		8,036			—			30,608
Property and equipment, net	—		251,948		11,059			—			263,007
Goodwill and other intangible assets, net	—		793,832		31,635			—			825,467
Net investments in and advances to (from) consolidated affiliates	811,982		117,963		(41,830		)	(888,115		)	—
Other assets	7,119		47,580		1,033			—			55,732
Long-term assets of discontinued operations	—		114,378		7,317			—			121,695
Total assets	$	819,101	$	2,093,141	$	70,578		$	(888,115	)	$	2,094,705
Liabilities and Shareholders’ Equity
Current liabilities	—		533,906		29,265			—			563,171
Current liabilities of discontinued operations	—		20,912		8,362			—			29,274
Long-term debt	—		460,603		87			—			460,690
Other liabilities	—		209,225		21,138			—			230,363
Total liabilities	$	—	$	1,224,646	$	58,852		$	—		$	1,283,498
Total shareholders’ equity	$	819,101	$	868,495	$	11,726		$	(888,115	)	$	811,207
Total liabilities and shareholders’ equity	$	819,101	$	2,093,141	$	70,578		$	(888,115	)	$	2,094,705

Condensed Consolidating Statements Of Operations And Comprehensive Income

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME

For the Year Ended December 31, 2012 (in thousands)



	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	3,538,288		$	188,501		$	—		$	3,726,789
Costs of revenue, excluding depreciation and amortization	—			3,074,031			165,164			—			3,239,195
Depreciation and amortization	2			89,626			2,330			—			91,958
General and administrative expenses	1,665			145,831			10,028			—			157,524
Interest expense, net	—			37,378			(2		)	—			37,376
Other expense, net	—			7,838			179			—			8,017
(Loss) income from continuing operations before provision for income taxes	$	(1,667	)	$	183,584		$	10,802		$	—		$	192,719
Benefit (provision) for income taxes	675			(74,440		)	(2,315		)	—			(76,080		)
(Loss) income from continuing operations before non-controlling interests	$	(992	)	$	109,144		$	8,487		$	—		$	116,639
(Loss) income from discontinued operations, net of tax	—			(7,390		)	(1,833		)	—			(9,223		)
Equity in income from subsidiaries, net of tax	108,408			—			—			(108,408		)	—
Net income (loss)	$	107,416		$	101,754		$	6,654		$	(108,408	)	$	107,416
Net loss attributable to non-controlling interests	—			—			(10		)	—			(10		)
Net income (loss) attributable to MasTec, Inc.	$	107,416		$	101,754		$	6,664		$	(108,408	)	$	107,426
Comprehensive income (loss)	$	107,416		$	102,275		$	8,578		$	(108,408	)	$	109,861

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME

For the Year Ended December 31, 2011 (in thousands)



	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	2,726,618		$	104,674		$	—		$	2,831,292
Costs of revenue, excluding depreciation and amortization	—			2,360,578			99,168			—			2,459,746
Depreciation and amortization	—			71,905			2,246			—			74,151
General and administrative expenses	2,530			125,136			4,928			—			132,594
Interest expense, net	—			34,391			75			—			34,466
Gain on remeasurement of equity interest in acquiree	—			(29,041		)	—			—			(29,041		)
Other expense (income), net	—			224			(128		)	—			96
(Loss) income from continuing operations before provision for income taxes	$	(2,530	)	$	163,425		$	(1,615	)	$	—		$	159,280
Benefit (provision) for income taxes	989			(64,395		)	1,582			—			(61,824		)
(Loss) income from continuing operations before non-controlling interests	$	(1,541	)	$	99,030		$	(33	)	$	—		$	97,456
Income (loss) from discontinued operations, net of tax	—			10,007			(1,491		)	—			8,516
Equity in income from subsidiaries, net of tax	107,513			—			—			(107,513		)	—
Net income (loss)	$	105,972		$	109,037		$	(1,524	)	$	(107,513	)	$	105,972
Net loss attributable to non-controlling interests	—			—			(29		)	—			(29		)
Net income (loss) attributable to MasTec, Inc.	$	105,972		$	109,037		$	(1,495	)	$	(107,513	)	$	106,001
Comprehensive income (loss)	$	105,972		$	108,877		$	(3,154	)	$	(107,513	)	$	104,182

Condensed Consolidating Statements Of Cash Flows

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Year Ended December 31, 2012 (in thousands)



	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(1,254	)	$	151,866		$	21,523		$	—	$	172,135
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	$	—		$	(151,736	)	$	(1,402	)	$	—	$	(153,138	)
Capital expenditures	—			(77,744		)	(1,942		)	—		(79,686		)
Proceeds from sale of assets	—			7,385			—			—		7,385
Proceeds from disposal of business, net	—			97,728			—			—		97,728
Investments in life insurance policies	(284		)	—			—			—		(284		)
Net cash used in investing activities	$	(284	)	$	(124,367	)	$	(3,344	)	$	—	$	(127,995	)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	$	—		$	959,183		$	—		$	—	$	959,183
Repayments of credit facility	—			(885,183		)	—			—		(885,183		)
Repayments of other borrowings	—			(21,455		)	—			—		(21,455		)
Proceeds from book overdrafts	—			116			—			—		116
Payments of capital lease obligations	—			(21,034		)	(26		)	—		(21,060		)
Proceeds from stock options exercises and other share-based awards	5,013			—			—			—		5,013
Excess tax benefit from stock-based compensation	—			759			—			—		759
Purchases of treasury stock	(75,000		)	—			—			—		(75,000		)
Payments of financing costs	—			(117		)	—			—		(117		)
Net financing activities and advances (to) from consolidated affiliates	71,525			(58,181		)	(13,344		)	—		—
Net cash provided by (used in) financing activities	$	1,538		$	(25,912	)	$	(13,370	)	$	—	$	(37,744	)
Net increase (decrease) in cash and cash equivalents	—			1,587			4,809			—		6,396
Net effect of currency translation on cash	—			—			91			—		91
Cash and cash equivalents - beginning of period	—			16,240			4,040			—		20,280
Cash and cash equivalents - end of period	$	—		$	17,827		$	8,940		$	—	$	26,767
Cash and cash equivalents of discontinued operations	$	—		$	275		$	110		$	—	$	385
Cash and cash equivalents of continuing operations	$	—		$	17,552		$	8,830		$	—	$	26,382

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Year Ended December 31, 2011 (in thousands)



	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(939	)	$	21,729		$	(14,964	)	$	—	$	5,826
Cash flows used in investing activities:
Cash paid for acquisitions, net, including contingent consideration	$	(31,236	)	$	(44,716	)	$	(9,443	)	$	—	$	(85,395	)
Capital expenditures	—			(71,615		)	(95		)	—		(71,710		)
Proceeds from sale of assets	—			5,887			340			—		6,227
Proceeds from sale or redemption of investments	—			4,600			—			—		4,600
Investments in life insurance policies	(284		)	—			—			—		(284		)
Net cash used in investing activities	$	(31,520	)	$	(105,844	)	$	(9,198	)	$	—	$	(146,562	)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	$	—		$	370,411		$	—		$	—	$	370,411
Repayments of credit facility	—			(310,411		)	—			—		(310,411		)
Repayments of other borrowings	—			(13,956		)	—			—		(13,956		)
Proceeds from book overdrafts	—			14,906			—			—		14,906
Payments of capital lease obligations	—			(16,422		)	(36		)	—		(16,458		)
Proceeds from stock options exercises and other share-based awards	12,542			—			—			—		12,542
Excess tax benefit from stock-based compensation	—			7,766			—			—		7,766
Purchases of treasury stock	(75,000		)	—			—			—		(75,000		)
Payments of financing costs	—			(6,589		)	—			—		(6,589		)
Net financing activities and advances (to) from consolidated affiliates	94,917			(122,573		)	27,656			—		—
Net cash provided by (used in) financing activities	$	32,459		$	(76,868	)	$	27,620		$	—	$	(16,789	)
Net (decrease) increase in cash and cash equivalents	—			(160,983		)	3,458			—		(157,525		)
Net effect of currency translation on cash	—			—			201			—		201
Cash and cash equivalents - beginning of period	—			177,223			381			—		177,604
Cash and cash equivalents - end of period	$	—		$	16,240		$	4,040		$	—	$	20,280
Cash and cash equivalents of discontinued operations	$	—		$	11,386		$	1,488		$	—	$	12,874
Cash and cash equivalents of continuing operations	$	—		$	4,854		$	2,552		$	—	$	7,406

Business, Basis of Presentation and Significant Accounting Policies (Narrative) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Impairment of assets, disposal group	$ (12,922,000)	$ 0	$ 0
Accumulated other comprehensive loss	5,501,000	7,946,000
Cash overdrafts	$ 15,000,000	14,900,000
Credit loss estimates	Credit loss estimates are derived by comparing the estimated fair value of the securities, which are based on a number of factors, including estimated probabilities of default, with the value that would have been derived if the probability of default for the same securities were zero percent. The difference between the recorded fair value and the estimated fair value assuming a zero probability of default is considered the portion of total decline in fair value attributable to credit losses.
Inventory obsolescence reserves	$ 15,400,000	13,600,000	15,100,000	$ 18,700,000
Net deferred financing costs	9,900,000	13,500,000
Impairment charges for long-lived assets	0	0	0
Multiemployer plans, withdrawal liability	$ 6,400,000
Recently issued accounting standards, not yet adopted as of December 31, 2012	In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”). The objective of ASU 2013-02 is to improve the reporting of reclassifications out of accumulated other comprehensive income. The amendments require disclosure of information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, disclosure is required, either on the face of the statement where net income is presented or in the notes, of significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures required under U.S. GAAP that provide additional detail about those amounts. The new requirements will take effect for public companies in interim and annual reporting periods beginning after December 15, 2012. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements.
Recently adopted accounting pronoucements	In July 2012, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2012-02 Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment (“ASU 2012-02”). ASU 2012-02 permits an entity to first assess qualitative factors to determine whether it is "more likely than not" (or a likelihood greater than 50%) that an indefinite-lived intangible asset is impaired before performing quantitative impairment testing. ASU 2012-02 is effective for fiscal years beginning after September 15, 2012, with early adoption permitted. The Company adopted ASU 2012-02 in connection with its 2012 indefinite-lived intangible asset impairment assessment. See Note 5 – Goodwill and Other Intangible Assets. In May 2011, the FASB issued ASU 2011-04, Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and International Financial Reporting Standards (“ASU 2011-04”). The objective of ASU 2011-04 is to converge guidance of the FASB and the International Accounting Standards Board on fair value measurement and disclosure. This update changes the wording used to describe many of the requirements in U.S. GAAP for measuring fair value and disclosing information about fair value measurements; clarifies the FASB’s intent about the application of existing fair value measurement requirements; and changes particular principles or requirements for measuring fair value or for disclosing information about fair value measurements. ASU 2011-04, which the Company adopted as of January 1, 2012, was effective prospectively for interim and annual periods beginning after December 15, 2011. The wording of fair value disclosures in Note 6 - Fair Value of Financial Instruments corresponds to the new requirements. In June 2011, the FASB issued ASU 2011-05, Comprehensive Income (Topic 220): Presentation of Comprehensive Income (“ASU 2011-05”). The objective of ASU 2011-05 is to improve the comparability, consistency and transparency of financial reporting and to increase the prominence of items reported in other comprehensive income. ASU 2011-05 provides the option to present the total of comprehensive income, (equal to the components of net income and the components of other comprehensive income) either in a single continuous statement of comprehensive income or in two separate but consecutive statements. ASU 2011-05 eliminates the option to present the components of other comprehensive income as part of the statement of shareholders' equity as shown in the prior years. In December 2011, the FASB issued ASU 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in ASU 2011-05 (“ASU 2011-12”), which defers the provisions in ASU 2011-05 relating to the presentation of reclassification adjustments. ASU 2011-12 reinstates the requirements for the presentation of reclassifications out of accumulated other comprehensive income that were in place before ASU 2011-05. The remaining provisions of ASU 2011-05 are effective retrospectively for annual periods, and interim periods within those years, beginning after December 15, 2011. ASU 2011-12, which the Company adopted as of January 1, 2012, is effective for reporting periods beginning after December 15, 2011. See the consolidated statements of comprehensive income for related disclosures.
Workers Compensation Policy [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Per claim deductible, insurance policies	$ 1,000,000
General Liability Policy [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Per claim deductible, insurance policies	2,000,000
Automobile Liability Policy [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Per claim deductible, insurance policies	2,000,000
Umbrella Policy [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Maximum coverage, per claim and aggregate	100,000,000
Per Employee [Member] \| Insurance Claims [Member] \| Group Insurance Policies [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Maximum annual loss	$ 400,000
Collateralized Debt Obligations [Member] \| Auction Rate Securities [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Investment, debt security, default rate of underlying assets	6.22%
Minimum [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Open tax year	2009
Share-based compensation arrangement, vesting period	1 year
Minimum [Member] \| Collateralized Debt Obligations [Member] \| Auction Rate Securities [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Investment, debt security, default rate of underlying assets	8.00%
Maximum [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Share-based compensation arrangement, vesting period	5 years
Maximum [Member] \| Collateralized Debt Obligations [Member] \| Auction Rate Securities [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Investment, debt security, default rate of underlying assets	9.00%
Globetec [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Impairment of assets, disposal group	$ (12,700,000)	0	0
Goodwill and intangible asset impairment, disposal group	$ 6,400,000
Auction Rate Securities [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Fair value measurements, significant assumptions	The model incorporates assumptions that market participants would use in their estimates of fair value, such as reset interest rates, final stated maturities, collateral values, credit quality and insurance, and applies the probabilities of either (a) a successful auction; (b) a failed auction; or (c) a default; at each auction.
Inventory Valuation Reserve [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Inventory obsolescence reserves	$ 2,000,000	$ 2,200,000	$ 400,000	$ 100,000
Stock Option [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Share-based compensation arrangement, expiration date	Stock option grants vest between one to five years after grant, have a term not to exceed ten years, and are generally forfeited if the holder terminates his or her employment or relationship with the Company or one of its affiliates.
Software and Software Development Costs [Member] \| Maximum [Member]
Business, Basis of Presentation and Significant Accounting Policies [Line Items]
Software capitalization amortized period	7 years

Earnings Per Share (Schedule Of Earnings Per Share, Basic and Diluted) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Net Income (Loss) Available to Common Stockholders, Basic

Net income from continuing operations

$ 116,639

$ 97,454

$ 66,166

Net income (loss) from discontinued operations

(9,213)

8,547

24,362

Net income attributable to MasTec, Inc.

$ 36,300

$ 26,800

$ 30,100

$ 14,200

$ 8,600

$ 31,800

$ 44,500

$ 21,100

$ 107,426

$ 106,001

$ 90,528

Weighted Average Number of Shares Outstanding, Basic

Weighted average shares outstanding

78,275

82,182

76,132

Earnings (Loss) Per Share, Basic

Basic earnings per share, continuing operations

$ 0.50

^[1]

$ 0.47

^[1]

$ 0.39

^[1]

$ 0.15

^[1]

$ 0.08

^[1]

$ 0.36

^[1]

$ 0.52

^[1]

$ 0.21

^[1]

$ 1.49

$ 1.19

$ 0.87

Basic earnings per share, discontinued operations

(0.02)

^[1]

(0.12)

^[1]

(0.01)

^[1]

0.03

^[1]

0.02

^[1]

0.01

^[1]

0.01

^[1]

0.06

^[1]

(0.12)

0.10

0.32

Total basic earnings per share

0.48

^[1]

0.35

^[1]

0.37

^[1]

0.18

^[1]

0.10

^[1]

0.37

^[1]

0.53

^[1]

0.27

^[1]

$ 1.37

^[2]

$ 1.29

^[2]

$ 1.19

^[2]

Net Income (Loss) Available to Common Stockholders, Diluted

Net income from continuing operations

$ 116,639

$ 97,454

$ 66,166

Diluted net income from continuing operations

116,950

97,939

71,297

Net income (loss) from discontinued operations

(9,213)

8,547

24,362

Diluted net income attributable to MasTec

$ 107,737

$ 106,486

$ 95,659

Weighted Average Number of Shares Outstanding, Diluted

Weighted average shares outstanding

78,275

82,182

76,132

Dilutive common stock equivalents

888

1,127

994

Diluted weighted average shares outstanding

82,087

86,716

90,885

Earnings (Loss) Per Share, Diluted

Diluted earnings per share, continuing operations

0.46

^[1]

0.45

^[1]

0.38

^[1]

0.14

^[1]

0.08

^[1]

0.35

^[1]

0.50

^[1]

0.20

^[1]

$ 1.42

$ 1.13

$ 0.78

Diluted earnings per share, discontinued operations

(0.02)

^[1]

(0.12)

^[1]

(0.01)

^[1]

0.03

^[1]

0.02

^[1]

0.01

^[1]

0.01

^[1]

0.06

^[1]

(0.11)

0.10

0.27

Total diluted earnings per share

$ 0.45

^[1]

$ 0.34

^[1]

$ 0.37

^[1]

$ 0.17

^[1]

$ 0.10

^[1]

$ 0.36

^[1]

$ 0.51

^[1]

$ 0.26

^[1]

$ 1.31

^[2]

$ 1.23

^[2]

$ 1.05

^[2]

Convertible Debt [Member] | Original 4.0% Notes [Member]

Net Income (Loss) Available to Common Stockholders, Diluted

Interest expense on convertible debt, net of tax

$ 234

$ 331

$ 2,667

Weighted Average Number of Shares Outstanding, Diluted

Dilutive shares

612

862

7,297

Convertible Debt [Member] | Original 4.25% Notes [Member]

Net Income (Loss) Available to Common Stockholders, Diluted

Interest expense on convertible debt, net of tax

$ 77

$ 154

$ 2,464

Weighted Average Number of Shares Outstanding, Diluted

Dilutive shares

194

383

6,462

Convertible Debt [Member] | New 4.0% Notes [Member]

Weighted Average Number of Shares Outstanding, Diluted

Dilutive premium shares

1,044

1,067

Convertible Debt [Member] | New 4.25% Notes [Member]

Weighted Average Number of Shares Outstanding, Diluted

Dilutive premium shares

1,074

1,095

[1]	Note that due to rounding differences, the sum of the Company’s quarterly earnings per share in a given year may not be the same as the Company’s year to date earnings per share for the same period. In addition, earnings per share calculations may contain slight summation differences due to rounding. See Note 2 – Earnings per Share.
[2]	Earnings per share tables may contain slight summation differences due to rounding

Earnings Per Share (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share [Line Items]
Computation of earnings per share, methodology		Basic earnings per share is computed by dividing earnings available to MasTec’s common shareholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share is computed by dividing earnings by the number of fully diluted shares, which includes the effect of dilutive potential issuances of common shares, as determined using earnings from continuing operations. Potentially dilutive common shares include outstanding stock options and unvested restricted share awards, as calculated under the treasury stock method, as well as shares associated with the Company’s outstanding convertible debt securities.
Restricted Stock [Member]
Earnings Per Share [Line Items]
Anti-dilutive common stock equivalents, shares		2,032	9,479	1,031,894
Convertible Debt [Member] \| Original 4.0% Notes [Member]
Earnings Per Share [Line Items]
Debt instrument, exchanged amount	$ 105.3
Debt instrument interest rate, stated percentage	4.00%	4.00%
Debt instrument, convertible, conversion price per share		$ 15.76
Convertible Debt [Member] \| New 4.0% Notes [Member]
Earnings Per Share [Line Items]
Debt instrument interest rate, stated percentage	4.00%	4.00%
Debt instrument, convertible, conversion price per share		$ 15.76	$ 15.76	$ 15.76
Debt instrument, convertible, number of conversion shares, principal amount		6,683,000	6,683,000
Convertible Debt [Member] \| Original 4.25% Notes [Member]
Earnings Per Share [Line Items]
Debt instrument, exchanged amount	$ 97.0
Debt instrument interest rate, stated percentage	4.25%	4.25%
Debt instrument, convertible, conversion price per share		$ 15.48
Convertible Debt [Member] \| New 4.25% Notes [Member]
Earnings Per Share [Line Items]
Debt instrument interest rate, stated percentage	4.25%	4.25%
Debt instrument, convertible, conversion price per share		$ 15.48	$ 15.48	$ 15.48
Debt instrument, convertible, number of conversion shares, principal amount		6,268,000	6,268,000
Convertible Debt [Member] \| Total New Senior Convertible Notes [Member]
Earnings Per Share [Line Items]
Debt instrument, convertible, number of conversion shares, principal amount		13,000,000	13,000,000	13,000,000

Earnings Per Share (Schedule Of Convertible Debt, By Dilutive and Anti-Dilutive Classification) (Detail) - Convertible Debt [Member] - USD ($)
$ in Thousands

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Nov. 30, 2009

Jun. 30, 2009

New 4.0% Notes [Member]

^[1]

$ 105,322

New 4.25% Notes [Member]

Original 4.0% Notes [Member]

^[1]

97,000

Original 4.25% Notes [Member]

9,700

^[2]

9,700

^[2]

$ 115,000

^[2]

$ 115,000

Total Dilutive Convertible Debt [Member]

3,000

^[2]

3,000

^[2]

100,000

^[2]

$ 100,000

$ 215,000

[1]	Dilutive shares associated with the New Notes are attributable to the premium over the respective conversion prices.
[2]	Dilutive shares associated with the Original Notes are attributable to the underlying principal amounts.

Earnings Per Share (Schedule Of Convertible Debt Information) (Detail) - Convertible Debt [Member]
$ / shares in Units, shares in Thousands, $ in Thousands

12 Months Ended

Dec. 31, 2012

USD ($)

$ / shares

Dec. 31, 2011

USD ($)

$ / shares

Dec. 31, 2010

$ / shares

New 4.0% Notes [Member]

Conversion price per share | $ / shares

Principal amount | $

^[1]

$ 105,322

$ 15.76

Number of conversion shares, principal amount | shares

6,683

Excess over principal amount | $

$ 19,494

$ 20,968

Weighted average equivalent premium shares (in thousands) | shares

1,044

1,067

New 4.0% Notes [Member] | Weighted Average [Member]

Weighted average actual per share price | $ / shares

$ 18.68

$ 18.90

New 4.25% Notes [Member]

Conversion price per share | $ / shares

Principal amount | $

^[1]

$ 97,000

$ 15.48

Number of conversion shares, principal amount | shares

6,268

Excess over principal amount | $

$ 20,064

$ 21,139

Weighted average equivalent premium shares (in thousands) | shares

1,074

1,095

New 4.25% Notes [Member] | Weighted Average [Member]

Weighted average actual per share price | $ / shares

$ 18.68

$ 18.88

[1]	Dilutive shares associated with the New Notes are attributable to the premium over the respective conversion prices.

Acquisitions and Other Investments Acquisitions and Other Investments - BLS (Narrative) (Details) - Bottom Line Services [Member] - USD ($) $ in Millions	1 Months Ended
	Dec. 31, 2012	Dec. 02, 2012
Business Acquisition [Line Items]
Effective date of acquisition	Dec. 01, 2012
Business combination, percentage of voting interests acquired		100.00%
Acquisition payments in cash		$ 67.6
Business combination, goodwill, expected tax deductible amount		$ 1.6
Earn-out Arrangements [Member]
Business Acquisition [Line Items]
Earn-out period		5 years
Estimated fair value of contingent consideration		$ 11.1
Business combination, contingent consideration arrangements, basis for amount	The earn-out is equal to 20% of the excess, if any, of BLS's annual EBITDA over $17 million dollars payable annually at MasTec's election in common stock, cash or a combination, thereof.
Fair value measurements, significant assumptions	The fair value of the earn-out obligation was estimated using an income approach and incorporates significant inputs not observable in the market. Key assumptions in the estimated valuation include the discount rate and probability-weighted EBITDA projections.
Business combination, contingent consideration arrangements, range of outcomes, value, low		0.0
Business combination, contingent consideration arrangements, range of outcomes, value, high		$ 22.0
Trade Names [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life	10 years
Noncompete Agreements [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life	10 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life	10 years

Acquisitions and Other Investments Acquisitions and Other Investments - EC Source (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended	12 Months Ended
	May 31, 2011	Apr. 30, 2011	Nov. 30, 2010	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	May 02, 2011
Business Acquisition [Line Items]
Payments to acquire equity method investments					$ 0	$ 0	$ 10,854
Gain on remeasurement of equity interest in acquiree					0	29,041	$ 0
EC Source [Member]
Business Acquisition [Line Items]
Date of acquisition agreement		Apr. 29, 2011
Effective date of acquisition	May 02, 2011
Business combination, percentage of voting interests acquired								67.00%
Business combination, step acquisition, cumulative percentage ownership after all transactions	100.00%
Acquisition payments in cash								$ 300
Assumed debt, balance outstanding					8,600
Business combination, step acquisition, equity interest in acquiree, percentage								33.00%
Business combination, step acquisition, equity interest in acquiree, fair value of equity investment								$ 39,600
Gain on remeasurement of equity interest in acquiree				$ 29,000
Business combination, step acquisition, equity interest in acquiree, valuation techniques	The fair value of the equity investment was determined based on the implied consideration transferred as of the date of the business combination, discounted for the Company’s lack of control as a minority shareholder.
E C Source Services Llc Investee [Member]
Business Acquisition [Line Items]
Payments to acquire equity method investments			$ 10,000
Equity method investment, ownership percentage			33.00%
Equity method investment, additional information			two-year option
Common Stock [Member] \| EC Source [Member]
Business Acquisition [Line Items]
Equity issued in business combination, number of shares issued	5,129,642
Equity issued in business combination, fair value								$ 94,200
Business combination, equity interest issued or issuable, description	The MasTec shares issued on the effective date are subject to transfer restrictions, 25% of which lapsed on May 2, 2012, 25% of which will lapse on May 2, 2013, and 50% of which will lapse on May 2, 2014.
Business combination, cost of acquired entity, equity interests issued and issuable, fair value method	The fair value of the shares transferred was based on MasTec’s quoted market price on the closing date, discounted by 10%, 15% and 20% for the estimated effect of the first, second and third year transfer restrictions, respectively.
Earn-out Arrangements [Member] \| EC Source [Member]
Business Acquisition [Line Items]
Earn-out period								5 years
Estimated fair value of contingent consideration								$ 25,000
Business combination, contingent consideration arrangements, basis for amount	The earn-out is equal to 20% of the excess, if any, of EC Source’s annual earnings before interest, taxes, depreciation and amortization (“EBITDA”), as defined in the purchase agreement, over $15 million, payable annually at MasTec’s election in common stock, cash or a combination thereof.
Fair value measurements, significant assumptions	The fair value of the earn-out obligation was estimated using an income approach and incorporates significant inputs not observable in the market. Key assumptions in the estimated valuation include the discount rate and probability-adjusted EBITDA projections.
Business combination, contingent consideration arrangements, range of outcomes, value, low								0
Business combination, contingent consideration arrangements, range of outcomes, value, high								55,000
Long-term Debt [Member]
Business Acquisition [Line Items]
Business combination, assumed debt					$ 20,600	$ 29,900
Long-term Debt [Member] \| Management [Member] \| EC Source [Member]
Business Acquisition [Line Items]
Business combination, assumed debt								$ 8,600
Order or Production Backlog [Member] \| EC Source [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life	3 years
Noncompete Agreements [Member] \| EC Source [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life	7 years

Acquisitions and Other Investments Acquisitions and Other Investments - Fabcor (Narrative) (Details) - Fabcor [Member] - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2011	Jun. 30, 2012	Apr. 02, 2011
Business Acquisition [Line Items]
Effective date of acquisition	Apr. 01, 2011
Business combination, percentage of voting interests acquired			100.00%
Acquisition payments in cash			$ 24.2
Purchase price consideration, adjustment		$ 1.4
Debt assumed and repaid	$ 7.0
Earn-out Arrangements [Member]
Business Acquisition [Line Items]
Earn-out period			5 years
Estimated fair value of contingent consideration			$ 16.9
Business combination, contingent consideration arrangements, basis for amount	The earn-out is equal to 30% of the excess, if any, of Fabcor's annual EBITDA over 3.6 million Canadian dollars (approximately U.S. $3.6 million as of December 31, 2012), payable annually to the seller in cash in Canadian dollars
Fair value measurements, significant assumptions	The fair value of the earn-out obligation was estimated using an income approach and incorporates significant inputs not observable in the market. Key assumptions in the estimated valuation include the discount rate and probability-adjusted EBITDA projections.
Business combination, contingent consideration arrangements, range of outcomes, value, low			0.0
Business combination, contingent consideration arrangements, range of outcomes, value, high			$ 25.0
Order or Production Backlog [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life	9 months
Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life	12 years
Noncompete Agreements [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life	7 years

Acquisitions And Other Investments (Narrative) (Detail) - USD ($) $ in Millions	1 Months Ended					3 Months Ended	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2011	May 31, 2011	Apr. 30, 2011	Dec. 31, 2010	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 02, 2012	Jun. 02, 2011	May 02, 2011	Apr. 02, 2011	Dec. 24, 2010
Business Acquisition [Line Items]
Asset impairment charges, cost method investments							$ 0.0	$ 0.0	$ 0.0
Asset impairment charges, equity method investments							$ 0.0	0.0	0.0
Panama Subsidiary [Member] \| Segment, Discontinued Operations [Member]
Business Acquisition [Line Items]
Less than wholly owned subsidiary, ownership percentage	60.00%						60.00%
Rock Extraction Business [Member] \| Panama Subsidiary [Member] \| Segment, Discontinued Operations [Member]
Business Acquisition [Line Items]
Equity method investment, ownership percentage	34.00%						34.00%
Related party revenues							$ 2.3	3.7	$ 1.8
Related party receivables, equity method investee	$ 3.7						$ 3.7	6.7
Due from related party, equity method investee, non-current portion								4.3
Rock Extraction Business [Member] \| Beneficial Owner [Member] \| Segment, Discontinued Operations [Member]
Business Acquisition [Line Items]
Equity method investment, ownership percentage	20.40%						20.40%
Long-term Debt [Member]
Business Acquisition [Line Items]
Business combination, assumed debt	$ 20.6						$ 20.6	29.9
Bottom Line Services [Member]
Business Acquisition [Line Items]
Effective date of acquisition	Dec. 01, 2012
Business combination, percentage of voting interests acquired										100.00%
Acquisition payments in cash										$ 67.6
Bottom Line Services [Member] \| Earn-out Arrangements [Member]
Business Acquisition [Line Items]
Earn-out period										5 years
Business combination, contingent consideration arrangements, basis for amount	The earn-out is equal to 20% of the excess, if any, of BLS's annual EBITDA over $17 million dollars payable annually at MasTec's election in common stock, cash or a combination, thereof.
Estimated fair value of contingent consideration										$ 11.1
Dynamic Tower [Member]
Business Acquisition [Line Items]
Effective date of acquisition	Dec. 01, 2012
Business combination, percentage of voting interests acquired										100.00%
2012 Acquisitions [Member]
Business Acquisition [Line Items]
Acquiree revenue since acquisition date							12.9
Acquiree net income since acquisition date							0.1
Business combination, acquisition costs							0.7
Cam Com [Member]
Business Acquisition [Line Items]
Effective date of acquisition				Apr. 01, 2011
Business combination, percentage of voting interests acquired													100.00%
Acquisition payments in cash													$ 4.4
Cam Com [Member] \| Earn-out Arrangements [Member]
Business Acquisition [Line Items]
Earn-out period													5 years
Business combination, contingent consideration arrangements, basis for amount				earn-out payable in cash equal to 20% of the excess, if any, of Cam Com’s annual EBITDA over $2.25 million, plus an additional one time cash payment of up to $1.5 million if Cam Com’s EBITDA exceeds $1.5 million for the first twelve months following the acquisition
Estimated fair value of contingent consideration													$ 3.0
Cam Com [Member] \| Capital Lease Obligations [Member]
Business Acquisition [Line Items]
Business combination, assumed debt													$ 0.3
Halsted [Member]
Business Acquisition [Line Items]
Effective date of acquisition		Jun. 30, 2011
Business combination, percentage of voting interests acquired		100.00%
Acquisition payments in cash		$ 4.0
Debt assumed and repaid		4.4
Purchase price allocation, adjustment, liabilities						$ 3.9
Halsted [Member] \| Long-term Debt [Member]
Business Acquisition [Line Items]
Business combination, assumed debt		$ 7.9
Optima [Member]
Business Acquisition [Line Items]
Effective date of acquisition		Jun. 01, 2011
Business combination, percentage of voting interests acquired											100.00%
Acquisition payments in cash											$ 5.1
Debt assumed and repaid		$ 0.8
Optima [Member] \| Earn-out Arrangements [Member]
Business Acquisition [Line Items]
Earn-out period											5 years
Business combination, contingent consideration arrangements, basis for amount		earn-out, equal to 20% of the excess, if any, of Optima’s annual EBITDA over $3.0 million, plus an additional one-time cash payment of up to approximately $5.0 million if Optima’s EBITDA exceeds $1.5 million in the first twelve months following the date of acquisition. The potential earn-out is payable, at MasTec’s election, in common stock, cash, or a combination thereof.
Estimated fair value of contingent consideration											$ 3.0
Purchase price consideration, adjustment						1.5
Optima [Member] \| Long-term Debt [Member]
Business Acquisition [Line Items]
Business combination, assumed debt											$ 2.2
2011 Acquisitions [Member]
Business Acquisition [Line Items]
Acquiree revenue since acquisition date							164.7	265.3
Acquiree net income since acquisition date							$ 11.6	10.8
Business combination, acquisition costs								$ 1.6
Nsoso [Member]
Business Acquisition [Line Items]
Cash payment, previous acquisition					$ 40.0
Purchase accounting adjustment, goodwill					$ 67.0
Nsoso [Member] \| Earn-out Arrangements [Member]
Business Acquisition [Line Items]
Business combination, contingent consideration arrangements, basis for amount					Future annual earn-out payments for the five years beginning in 2011 are calculated as 27.5% of domestic annualized earnings before tax in excess of $40 million, payable, at MasTec’s sole option, in either cash, shares of MasTec common stock, or any combination thereof.
Nsoso [Member] \| Common Stock [Member]
Business Acquisition [Line Items]
Equity issued in business combination, number of shares issued					1,875,000
Equity issued in business combination, fair value														$ 27.0
Business combination, cost of acquired entity, equity interests issued and issuable, fair value method					based on the average market price five days before and after the terms of the amendment were agreed to and announced
Go Green [Member]
Business Acquisition [Line Items]
Effective date of acquisition	Dec. 01, 2012
Business combination, percentage of voting interests acquired										100.00%
EC Source [Member]
Business Acquisition [Line Items]
Effective date of acquisition			May 02, 2011
Business combination, percentage of voting interests acquired												67.00%
Acquisition payments in cash												$ 0.3
EC Source [Member] \| Earn-out Arrangements [Member]
Business Acquisition [Line Items]
Earn-out period												5 years
Business combination, contingent consideration arrangements, basis for amount			The earn-out is equal to 20% of the excess, if any, of EC Source’s annual earnings before interest, taxes, depreciation and amortization (“EBITDA”), as defined in the purchase agreement, over $15 million, payable annually at MasTec’s election in common stock, cash or a combination thereof.
Estimated fair value of contingent consideration												$ 25.0
EC Source [Member] \| Common Stock [Member]
Business Acquisition [Line Items]
Equity issued in business combination, number of shares issued			5,129,642
Equity issued in business combination, fair value												$ 94.2
Business combination, cost of acquired entity, equity interests issued and issuable, fair value method			The fair value of the shares transferred was based on MasTec’s quoted market price on the closing date, discounted by 10%, 15% and 20% for the estimated effect of the first, second and third year transfer restrictions, respectively.
Fabcor [Member]
Business Acquisition [Line Items]
Effective date of acquisition				Apr. 01, 2011
Business combination, percentage of voting interests acquired													100.00%
Acquisition payments in cash													$ 24.2
Debt assumed and repaid				$ 7.0
Purchase price consideration, adjustment						$ 1.4
Fabcor [Member] \| Earn-out Arrangements [Member]
Business Acquisition [Line Items]
Earn-out period													5 years
Business combination, contingent consideration arrangements, basis for amount				The earn-out is equal to 30% of the excess, if any, of Fabcor's annual EBITDA over 3.6 million Canadian dollars (approximately U.S. $3.6 million as of December 31, 2012), payable annually to the seller in cash in Canadian dollars
Estimated fair value of contingent consideration													$ 16.9

Acquisitions And Other Investments (Schedule Of Business Acquisitions, Consideration Paid And Purchase Price Allocation) (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 02, 2012	Dec. 31, 2011	May 02, 2011	Apr. 02, 2011	Dec. 31, 2010
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Goodwill	$ 820,341		$ 714,760			$ 525,600
Long-term Debt [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Liabilities	$ (20,600)		$ (29,900)
EC Source [Member]
Purchase price consideration:
Cash				$ 300
Total consideration transferred				119,500
Fair value of equity investment				39,600
Fair value of total consideration				159,100
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Property and equipment				10,100
Total identifiable net assets				38,400
Goodwill				120,700
Total consideration allocated				159,100
EC Source [Member] \| Order or Production Backlog [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Intangible assets				11,000
EC Source [Member] \| Noncompete Agreements [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Intangible assets				1,500
EC Source [Member] \| Pre-Qualifications [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Intangible assets				31,300
EC Source [Member] \| Earn-out Arrangements [Member]
Purchase price consideration:
Fair value of contingent consideration (earn-out liability)				25,000
EC Source [Member] \| Current Assets [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Assets				21,000
EC Source [Member] \| Accrued Liabilities [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Liabilities				(13,400)
EC Source [Member] \| Long-term Debt [Member] \| Management [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Liabilities				(8,600)
EC Source [Member] \| Deferred Income Tax Charges [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Liabilities				(14,500)
EC Source [Member] \| Common Stock [Member]
Purchase price consideration:
Shares transferred				$ 94,200
Bottom Line Services [Member]
Purchase price consideration:
Cash		$ 67,600
Fair value of contingent consideration (earn-out liability)		11,100
Total consideration transferred		78,700
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Assets		36,400
Property and equipment		12,600
Total identifiable net assets		66,100
Goodwill		12,600
Total consideration allocated		78,700
Bottom Line Services [Member] \| Noncompete Agreements [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Intangible assets		500
Bottom Line Services [Member] \| Trade Names [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Intangible assets		2,600
Bottom Line Services [Member] \| Customer Relationships [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Intangible assets		24,400
Bottom Line Services [Member] \| Accrued Liabilities [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Liabilities		$ (10,400)
Fabcor [Member]
Purchase price consideration:
Cash					$ 24,200
Total consideration transferred					41,100
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Property and equipment					12,800
Total identifiable net assets					13,000
Goodwill					28,100
Total consideration allocated					41,100
Fabcor [Member] \| Order or Production Backlog [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Intangible assets					400
Fabcor [Member] \| Noncompete Agreements [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Intangible assets					100
Fabcor [Member] \| Trade Names [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Intangible assets					700
Fabcor [Member] \| Customer Relationships [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Intangible assets					3,100
Fabcor [Member] \| Earn-out Arrangements [Member]
Purchase price consideration:
Fair value of contingent consideration (earn-out liability)					16,900
Fabcor [Member] \| Current Assets [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Assets					24,300
Fabcor [Member] \| Accrued Liabilities [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Liabilities					(24,100)
Fabcor [Member] \| Deferred Income Tax Charges [Member]
Purchase price allocation to identifiable assets acquired and liabilities assumed:
Liabilities					$ (4,300)

Acquisitions and Other Investments Acquisitions and Other Investments (Schedule of Business Acquisition Pro Forma Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
2011 Acquisitions [Member]
Business Acquisition [Line Items]
Business acquisition, pro forma information, description	The unaudited pro forma combined results of operations for the years ended December 31, 2011 and 2010 have been prepared by adjusting the historical results of MasTec to include the historical results of the acquisitions described above as if they occurred January 1, 2010. These pro forma combined historical results were then adjusted for an increase in amortization expense due to the incremental intangible assets recorded related to the acquisitions and the reduction of interest income as a result of the cash consideration paid. The pro forma results of operations do not include any adjustments to eliminate the impact of acquisition related costs or any cost savings or other synergies that may result from these acquisitions. As noted above, the pro forma results of operations do not purport to be indicative of the actual results that would have been achieved by the combined company for the periods presented or that may be achieved by the combined company in the future.
Business acquisition, pro forma revenue		$ 3,115.6	$ 2,506.0
Business acquisition, pro forma net income (loss)		105.5	$ 85.6
2012 Acquisitions [Member]
Business Acquisition [Line Items]
Business acquisition, pro forma information, description	The unaudited pro forma combined results of operations for the years ended December 31, 2012 and 2011 have been prepared by adjusting the historical results of MasTec to include the historical results of the acquisitions described above as if they occurred January 1, 2011. These pro forma combined historical results were then adjusted for an increase in amortization expense due to the incremental intangible assets recorded related to the acquisitions and the reduction of interest income as a result of the cash consideration paid. The pro forma results of operations do not include any adjustments to eliminate the impact of acquisition related costs or any cost savings or other synergies that may result from these acquisitions. As noted above, the pro forma results of operations do not purport to be indicative of the actual results that would have been achieved by the combined company for the periods presented or that may be achieved by the combined company in the future.
Business acquisition, pro forma revenue	$ 3,879.1	2,931.1
Business acquisition, pro forma net income (loss)	$ 119.4	$ 112.3

Description of the pro forma information, nature of adjustments made to historical information to arrive at pro forma amounts, amounts excluded from pro forma information, any material-nonrecurring items included in the pro forma information and limitations of pro forma disclosures.

Discontinued Operations (Narrative) (Detail) - USD ($) $ in Millions	6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	May 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization expense, discontinued operations			$ 0.6	$ 1.1	$ 0.9
DirectStar [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations description			In May 2012, Red Ventures exercised its option to acquire from the Company all of the issued and outstanding equity interests in DirectStar, which provides marketing and sales services on behalf of DIRECTV®. The sale of DirectStar to Red Ventures was consummated in June 2012. The Company sold DirectStar for a net sale price of $98.9 million in cash. The DirectStar Business is presented as a discontinued operation in the Company’s consolidated financial statements for all periods presented.
Disposal date			Jun. 30, 2012
Net purchase price, sale of business	$ 98.9
Assets of discontinued operations				112.4		$ 117.2
Liabilities of discontinued operations				20.2		$ 18.0
Globetec [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations description		In September 2012, the Company's board of directors voted to approve a plan of sale for its Globetec business. The decision to sell was made after evaluation of, among other things, short and long-term prospects of the Globetec operation. Accordingly, Globetec's projects and assets are reflected as assets and liabilities of discontinued operations in the consolidated balance sheets for all periods presented, and Globetec's results of operations are presented as discontinued operations in the consolidated statements of operations for all periods presented.
Net assets of discontinued operations			$ 21.7
Assets of discontinued operations			26.3	39.9
Liabilities of discontinued operations			4.6	$ 9.1
Goodwill and intangible asset impairment, disposal group			6.4
Other asset impairment charges, disposal group			$ 6.3

Discontinued Operations (Summary of Assets and Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	May 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	$ 18,591		$ 30,608	$ 43,100
DirectStar [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets		$ 12,000	9,800
Property and equipment, net		1,200	1,400
Goodwill and other intangible assets, net		104,000	101,200
Assets of discontinued operations		117,200	112,400
Accounts payable and accrued expenses		10,600	9,600
Other current liabilities, including accrued earn-outs		7,400	10,600
Liabilities of discontinued operations		$ 18,000	20,200
Globetec [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	18,600		20,800
Property and equipment, net	2,000		2,200
Goodwill and other intangible assets, net	0		6,400
Other long-term assets	5,700		10,500
Assets of discontinued operations	26,300		39,900
Accounts payable and accrued expenses	900		6,100
Other current liabilities, including accrued earn-outs	3,700		3,000
Liabilities of discontinued operations	$ 4,600		$ 9,100

Discontinued Operations (Results of Operations from Discontinued Operations) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of assets, disposal group, before benefit from income taxes									$ (12,922)	$ 0	$ 0
(Provision for) benefit from income taxes									4,500	(6,200)	(15,600)
Net income (loss) from discontinued operations	$ (1,300)	$ (9,300)	$ (1,100)	$ 2,500	$ 1,600	$ 1,000	$ 1,100	$ 4,800	(9,223)	8,516	24,257
DirectStar [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue									60,200	148,500	143,300
Income (loss) from operations before (provision for) benefit from income taxes									6,200	22,100	42,900
Loss on disposal before provision for income taxes									(200)	0	0
(Provision for) benefit from income taxes									(2,300)	(8,400)	(16,300)
Net income (loss) from discontinued operations									3,700	13,700	26,600
Globetec [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue									18,800	29,200	21,700
Income (loss) from operations before (provision for) benefit from income taxes									(7,000)	(7,400)	(3,000)
Impairment of assets, disposal group, before benefit from income taxes									(12,700)	0	0
(Provision for) benefit from income taxes									6,800	2,200	(700)
Net income (loss) from discontinued operations									$ (12,900)	$ (5,200)	$ (2,300)

Pretax provision recognizing a loss for initial, or subsequent, write-down to fair value (less cost to sell) of a disposal group that is classified as a component of the entity, which remains unsold as of the reporting date. May include the recognition of a pretax (gain) for a subsequent increase in fair value (less cost to sell), but not in excess of the cumulative loss previously recognized through write-downs.

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b),(c)
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 10
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 740
-SubTopic 20
-Section 45
-Paragraph 2
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 47
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 46
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.12)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
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-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.14)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 13
-Article 7

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 47
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 15
-Article 5

Goodwill And Other Intangible Assets [Line Items]

Goodwill And Other Intangible Assets (Goodwill And Intangible Assets) (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Gross carrying amount

^[1]

$ 129,400

$ 95,800

Less: accumulated amortization

^[1]

(58,500)

(51,300)

Amortizing intangible assets, net

70,900

^[1]

44,500

^[1]

$ 36,000

Non-amortizing intangible assets

66,200

34,900

Goodwill

820,341

714,760

525,600

Goodwill and other intangible assets

957,441

825,467

$ 596,500

Trade Names [Member]

Goodwill And Other Intangible Assets [Line Items]

Non-amortizing intangible assets

34,900

Pre-Qualifications [Member]

Goodwill And Other Intangible Assets [Line Items]

Non-amortizing intangible assets

$ 31,300

Weighted Average [Member]

Goodwill And Other Intangible Assets [Line Items]

Amortizing intangible assets, useful life

12 years

14 years

[1]	Consists principally of customer relationships, backlog, trade names and non-compete agreements with finite lives.

Goodwill And Other Intangible Assets (Rollforward of Intangible Assets, Including Goodwill) (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Goodwill and Other Intangible Assets [Roll Forward]

Other intangible assets, non-amortizing, beginning balance

$ 714,760

$ 525,600

66,200

34,900

Other intangible assets, amortizing, beginning balance

44,500

^[1]

36,000

Goodwill and other intangible assets, beginning balance

825,467

596,500

Additions from new business combinations, non-amortizing intangible assets

80,200

177,400

31,300

Additions from new business combinations, amortizing intangible assets

38,600

22,400

Additions from new business combinations, goodwill and other intangible assets

118,800

231,100

Accruals of acquisition-related contingent consideration

^[2]

25,500

11,800

Amortization expense

(12,200)

(13,900)

Currency translation, non-amortizing intangible assets

(200)

Currency translation, amortizing intangible assets

Currency translation, goodwill and other intangible assets

(200)

Other intangible assets, non-amortizing, ending balance

820,341

714,760

66,200

Other intangible assets, amortizing, ending balance

^[1]

70,900

44,500

Goodwill and other intangible assets, ending balance

957,441

825,467

Goodwill and Other Intangible Assets [Roll Forward]

Accruals of acquisition-related contingent consideration

^[2]

$ 25,500

$ 11,800

[1]	Consists principally of customer relationships, backlog, trade names and non-compete agreements with finite lives.
[2]	Represents contingent consideration for acquisitions prior to January 1, 2009, which is only accrued as earned, in accordance with U.S. GAAP.

Goodwill by Segment Rollforward (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

$ 714,760

$ 525,600

Accruals of acquisition-related contingent consideration

80,200

177,400

^[1]

25,500

11,800

(200)

Reportable Segment [Member] | Communications [Member]

820,341

714,760

258,000

227,900

36,500

28,600

Reportable Segment [Member] | Electrical Transmission [Member]

302,200

258,000

129,500

8,800

120,700

Reportable Segment [Member] | Oil and Gas [Member]

129,500

209,800

171,400

43,700

28,100

(200)

Reportable Segment [Member] | Power Generation and Industrial [Member]

271,100

209,800

117,500

117,500

Accruals of acquisition-related contingent consideration

^[1]

25,500

11,800

Earn-out Arrangements [Member] | Reportable Segment [Member] | Communications [Member]

Accruals of acquisition-related contingent consideration

^[1]

7,700

1,500

Earn-out Arrangements [Member] | Reportable Segment [Member] | Electrical Transmission [Member]

Accruals of acquisition-related contingent consideration

^[1]

Earn-out Arrangements [Member] | Reportable Segment [Member] | Oil and Gas [Member]

Accruals of acquisition-related contingent consideration

^[1]

17,800

10,300

Earn-out Arrangements [Member] | Reportable Segment [Member] | Power Generation and Industrial [Member]

Accruals of acquisition-related contingent consideration

^[1]

$ 0

[1]	Represents contingent consideration for acquisitions prior to January 1, 2009, which is only accrued as earned, in accordance with U.S. GAAP.

Goodwill and Other Intangible Assets (Schedule of Expected Amortization) (Details) - USD ($)
$ in Millions

Dec. 31, 2012

Dec. 31, 2011

^[1]

Dec. 31, 2010

Goodwill and Intangible Assets Disclosure [Abstract]

Finite-lived intangible assets, amortization expense, next twelve months

$ 16.4

Finite-lived intangible assets, amortization expense, year two

11.8

Finite-lived intangible assets, amortization expense, year three

9.0

Finite-lived intangible assets, amortization expense, year four

6.9

Finite-lived intangible assets, amortization expense, year five

5.3

Finite-lived intangible assets, amortization expense, after year five

21.5

Amortizing intangible assets, net

$ 70.9

^[1]

$ 44.5

$ 36.0

[1]	Consists principally of customer relationships, backlog, trade names and non-compete agreements with finite lives.

Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill [Line Items]
Fair value measurements, sensitivity analysis, description			A 100 basis point change in the discount rate would not have had a material impact on the results of the impairment analyses.
Impairment of assets, disposal group	$ 12,922	$ 0	$ 0
Impairment of intangible assets, indefinite-lived (excluding goodwill)	0	0	$ 0
Goodwill [Member]
Goodwill [Line Items]
Fair value measurements, significant assumptions			management estimated the fair values of the Company’s reporting units using a discounted cash flow methodology, which incorporated five-year projections of revenues, operating costs and cash flows considering historical and anticipated future results, general economic and market conditions, as well as the impact of planned business and operational strategies. Management applied a discounted cash flow technique utilizing a terminal value equal to 5.5 times year five EBITDA, which is defined as income from continuing operations before non-controlling interests before interest, taxes, depreciation and amortization.
Globetec [Member]
Goodwill [Line Items]
Impairment of assets, disposal group	12,700	$ 0	$ 0
Goodwill and intangible asset impairment, disposal group	$ 6,400
Goodwill [Member]
Goodwill [Line Items]
Fair value inputs, earnings before interest, taxes, depreciation, and amortization multiple			5.5
Goodwill [Member] \| Fair Value, Inputs, Level 3 [Member]
Goodwill [Line Items]
Change in discount rate			8.50%
Goodwill [Member] \| Interest Rate Risk [Member]
Goodwill [Line Items]
Change in discount rate			1.00%

Fair Value Of Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Detail) - USD ($)
$ in Millions

Dec. 31, 2012

Dec. 31, 2011

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

$ 11.9

$ 10.6

3.3

2.2

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

143.6

80.5

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

^[1]

14.4

13.6

Carrying Amount [Member]

Carrying Amount [Member] | Earn-out Arrangements [Member]

11.9

10.6

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

143.6

80.5

Carrying Amount [Member] | 7.625% Senior Notes [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

7.625% senior notes

150.0

Carrying Amount [Member] | Convertible Debt [Member] | Original 4.0% Notes [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Carrying Amount [Member] | Convertible Debt [Member] | Original 4.25% Notes [Member]

9.7

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Carrying Amount [Member] | Convertible Debt [Member] | New 4.0% Notes [Member]

3.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Carrying Amount [Member] | Convertible Debt [Member] | New 4.25% Notes [Member]

100.9

98.2

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Carrying Amount [Member] | Auction Rate Securities [Member]

92.1

89.9

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

14.4

13.6

Fair Value [Member]

Fair Value [Member] | Earn-out Arrangements [Member]

11.9

10.6

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

143.6

80.5

Fair Value [Member] | 7.625% Senior Notes [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

7.625% senior notes

154.9

156.4

Fair Value [Member] | Convertible Debt [Member] | Original 4.0% Notes [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value [Member] | Convertible Debt [Member] | Original 4.25% Notes [Member]

15.9

12.5

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value [Member] | Convertible Debt [Member] | New 4.0% Notes [Member]

5.1

4.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value [Member] | Convertible Debt [Member] | New 4.25% Notes [Member]

101.5

99.4

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value [Member] | Auction Rate Securities [Member]

92.7

91.1

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Carrying Amount [Member]

14.4

13.6

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Fair Value [Member]

3.3

2.2

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

$ 3.3

$ 2.2

[1]	The Company’s auction rate securities maintain split ratings. For purposes of this table, securities are categorized according to their lowest rating.

Fair Value Of Financial Instruments (Schedule Of Fair Values Of Financial Assets And Liabilities Measured On Recurring Basis) (Detail) - USD ($)
$ in Millions

Dec. 31, 2012

Dec. 31, 2011

$ 11.9

$ 10.6

3.3

2.2

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

143.6

80.5

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

^[1]

14.4

13.6

Level 1 [Member]

11.9

10.6

Level 1 [Member] | Earn-out Arrangements [Member]

3.3

2.2

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

0.0

Level 1 [Member] | Auction Rate Securities [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

0.0

Level 2 [Member]

0.0

Level 2 [Member] | Earn-out Arrangements [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

0.0

Level 2 [Member] | Auction Rate Securities [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

0.0

Level 3 [Member]

0.0

Level 3 [Member] | Earn-out Arrangements [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

143.6

80.5

Level 3 [Member] | Auction Rate Securities [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Schedule of Available-for-sale Securities [Line Items]

$ 14.4

$ 13.6

[1]	The Company’s auction rate securities maintain split ratings. For purposes of this table, securities are categorized according to their lowest rating.

Fair Value Of Financial Instruments (Reconciliation Of Assets And Liabilities Measured At Fair Value On Recurring Basis, Level 3) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reversal of unrealized losses on redeemed or sold securities	$ 0	$ 0	$ (936)
Earn-out Arrangements [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	80,500	45,000
Additions from new business combinations	66,700	47,700
Payments of contingent consideration	(3,600)	(12,200)
Changes in fair value recorded in earnings	0
Ending balance	143,600	80,500	45,000
Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	13,600	19,000
Redemption or sale of securities, cost basis		(4,600)
Reversal of unrealized losses on redeemed or sold securities		500
Changes in fair value recorded in earnings	0	(600)
Changes in unrealized (losses)/gains included in other comprehensive income	800	(700)
Ending balance	14,400	13,600	19,000
Auction Rate Securities [Member] \| Asset-backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	11,900	16,400
Redemption or sale of securities, cost basis		(4,600)
Reversal of unrealized losses on redeemed or sold securities		500
Changes in fair value recorded in earnings	0	0
Changes in unrealized (losses)/gains included in other comprehensive income	(200)	(400)
Ending balance	11,700	11,900	16,400
Auction Rate Securities [Member] \| Collateralized Debt Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,700	2,600
Redemption or sale of securities, cost basis		0
Reversal of unrealized losses on redeemed or sold securities		0
Changes in fair value recorded in earnings	0	(600)
Changes in unrealized (losses)/gains included in other comprehensive income	1,000	(300)
Ending balance	$ 2,700	$ 1,700	$ 2,600

Fair Value Of Financial Instruments (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis, not separately disclosed	$ 0.0	$ 0.0
Liabilities measured at fair value on a nonrecurring basis, not separately disclosed	$ 0.0	$ 0.0
Cash Surrender Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements, valuation techniques	Cash surrender values of life insurance policies are based on current cash surrender values as quoted by insurance carriers. Life insurance policies support the Company’s split dollar agreements and deferred compensation plan assets.
7.625% Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements, valuation techniques	The estimated fair values of the Company’s 7.625% senior notes and Original Notes, which are measured on a nonrecurring basis, are based on quoted market prices, a Level 1 input.
Convertible Debt [Member] \| Total New Senior Convertible Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements, valuation techniques	The estimated fair value of the debt component of the Company’s New Notes is calculated using an income approach, based on a discounted cash flow model.
Fair value measurements, significant assumptions	This method is based on management’s estimates of the Company’s market interest rate for a similar nonconvertible instrument.
Convertible Debt [Member] \| Total Remaining Original Convertible Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements, valuation techniques	The estimated fair values of the Company’s, 7.625% senior notes and Original Notes are based on quoted market prices.
Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements, valuation techniques	The fair value of the Company’s auction rate securities was estimated by an independent valuation firm, Houlihan Capital Advisors, LLC, using a probability weighted discounted cash flow model
Earn-out Arrangements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements, valuation techniques	The fair value of such acquisition-related contingent consideration is based on management’s estimates and entity-specific assumptions and is evaluated on an on-going basis
Carrying Amount [Member] \| Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements, valuation techniques	The fair value of deferred compensation plan liabilities is based on quoted market prices of the underlying employees' investment selections.

Securities Available For Sale (Narrative) (Detail)
$ in Thousands

3 Months Ended

12 Months Ended

15 Months Ended

27 Months Ended

39 Months Ended

Jun. 30, 2011

USD ($)

Dec. 31, 2012

USD ($)

Dec. 31, 2011

USD ($)

Dec. 31, 2010

USD ($)

Dec. 31, 2010

USD ($)

Dec. 31, 2011

USD ($)

Dec. 31, 2012

USD ($)

Cumulative credit and other losses recognized in earnings

$ 0

$ 574

$ 1,164

Schedule of Available-for-sale Securities [Line Items]

Interest earned on auction rate securities

400

700

Cumulative credit and other losses recognized in earnings

$ 3,300

17,900

Minimum [Member] | Auction Rate Securities [Member]

^[1]

$ 14,600

14,600

Schedule of Available-for-sale Securities [Line Items]

Auction-rate securities yield rate

1.68%

Maximum [Member] | Auction Rate Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Auction-rate securities yield rate

2.37%

Asset Backed Securities Redeemed [Member]

Schedule of Available-for-sale Securities [Line Items]

Cumulative unrealized losses on auction rates securities

$ 500

Asset-backed Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Cumulative unrealized losses on auction rates securities

$ 600

600

Collateralized Debt Obligations [Member] | Auction Rate Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Investment, debt security, default rate of underlying assets

6.22%

Cumulative credit and other losses recognized in earnings

$ 0

600

1,200

3,300

5,000

Unrealized gains on structured finance security

^[1]

1,700

$ 1,000

Contractual maturities of securities, in years | yr

Collateralized Debt Obligations [Member] | Minimum [Member] | Auction Rate Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Investment, debt security, default rate of underlying assets

8.00%

Collateralized Debt Obligations [Member] | Maximum [Member] | Auction Rate Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Investment, debt security, default rate of underlying assets

9.00%

Collateralized Debt Obligations Sold [Member] | Auction Rate Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Cumulative credit and other losses recognized in earnings

$ 4,600

11,200

Proceeds from sale of structured finance auction rate securities

6,600

7,000

Cumulative realized losses on auction rate securities

$ 4,200

Gain on sale of auction rate securities

$ 400

Asset Backed Securities Redeemed [Member] | Auction Rate Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Redemption of student loan auction rate securities at par

4,600

Reversal of unrealized losses on redeemed student loan auction rate securities, tax impact

$ 200

Asset-backed Securities [Member] | Auction Rate Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Gross cumulative losses on auction rate securities

^[1]

$ 12,900

12,900

$ 12,900

$ 1,200

$ 1,000

$ 1,200

Asset-backed Securities [Member] | Minimum [Member] | Auction Rate Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Contractual maturities of securities, in years | yr

Asset-backed Securities [Member] | Maximum [Member] | Auction Rate Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Contractual maturities of securities, in years | yr

[1]

Adjusted cost basis reflects adjustments for credit and other losses recognized in earnings on our structured finance security. Cumulative adjustments to the cost basis of securities held as of both December 31, 2012 and 2011 totaled $3.3 million. Par value of securities held as of both December 31, 2012 and 2011 totaled $17.9 million.

Securities Available For Sale (Fair Value Of Auction Rate Securities By Security Type And Underlying Credit Rating) (Detail) - Auction Rate Securities [Member] - USD ($)
$ in Millions

Dec. 31, 2012

Dec. 31, 2011

Schedule of Available-for-sale Securities [Line Items]

Underlying Credit Rating Aaa [Member]

^[1]

$ 14.4

$ 13.6

Schedule of Available-for-sale Securities [Line Items]

Underlying Credit Rating AA- [Member]

^[1]

11.9

Schedule of Available-for-sale Securities [Line Items]

Underlying Credit Rating BB [Member]

^[1]

9.1

Schedule of Available-for-sale Securities [Line Items]

Underlying Credit Rating CCC [Member]

^[1]

2.6

Schedule of Available-for-sale Securities [Line Items]

Collateralized Debt Obligations [Member]

^[1]

2.7

1.7

Schedule of Available-for-sale Securities [Line Items]

Collateralized Debt Obligations [Member] | Underlying Credit Rating Aaa [Member]

^[1]

2.7

1.7

Schedule of Available-for-sale Securities [Line Items]

Collateralized Debt Obligations [Member] | Underlying Credit Rating AA- [Member]

^[1]

0.0

Schedule of Available-for-sale Securities [Line Items]

Collateralized Debt Obligations [Member] | Underlying Credit Rating BB [Member]

^[1]

0.0

Schedule of Available-for-sale Securities [Line Items]

Collateralized Debt Obligations [Member] | Underlying Credit Rating CCC [Member]

^[1]

0.0

Schedule of Available-for-sale Securities [Line Items]

Asset-backed Securities [Member]

^[1]

2.7

1.7

Schedule of Available-for-sale Securities [Line Items]

Asset-backed Securities [Member] | Underlying Credit Rating Aaa [Member]

^[1]

11.7

11.9

Schedule of Available-for-sale Securities [Line Items]

Asset-backed Securities [Member] | Underlying Credit Rating AA- [Member]

^[1]

11.9

Schedule of Available-for-sale Securities [Line Items]

Asset-backed Securities [Member] | Underlying Credit Rating BB [Member]

^[1]

9.1

Schedule of Available-for-sale Securities [Line Items]

Asset-backed Securities [Member] | Underlying Credit Rating CCC [Member]

^[1]

2.6

Schedule of Available-for-sale Securities [Line Items]

^[1]

$ 0.0

[1]	The Company’s auction rate securities maintain split ratings. For purposes of this table, securities are categorized according to their lowest rating.

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

Securities Available For Sale Securtities Available For Sale (Other Than Temporary Losses Recognized on Auction Rate Securities) (Details) - USD ($) $ in Thousands	12 Months Ended			27 Months Ended	39 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2012
Gain (Loss) on Investments [Line Items]
Cumulative credit and other losses recognized in earnings	$ 0	$ 574	$ 1,164
Auction Rate Securities [Member]
Gain (Loss) on Investments [Line Items]
Cumulative credit and other losses recognized in earnings				$ 3,300	$ 3,300
Collateralized Debt Obligations [Member] \| Auction Rate Securities [Member]
Gain (Loss) on Investments [Line Items]
Total other-than-temporary impairment losses on securities available for sale		600	1,200
Less: unrealized losses on securities available for sale, recognized in other comprehensive income		0	0
Cumulative credit and other losses recognized in earnings	$ 0	$ 600	$ 1,200		$ 3,300

Before tax amount of other than temporary impairment (OTTI) on a debt security, categorized as available-for-sale, recognized in other comprehensive income (loss).

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

Schedule of Available-for-sale Securities [Line Items]

Securities Available For Sale Securities Available For Sale (Schedule Of Auction Rate Securities Sold) (Details) - Auction Rate Securities [Member] - USD ($)
$ in Millions

15 Months Ended

Dec. 31, 2010

Dec. 31, 2012

Dec. 31, 2011

Par value

$ 17.9

^[1]

14.6

Collateralized Debt Obligations Sold [Member]

^[2]

$ 14.4

$ 13.6

Schedule of Available-for-sale Securities [Line Items]

Par value

$ 11.2

6.6

Cumulative realized losses

5.7

4.2

Accumulated losses on other comprehensive income, net of tax

$ 0.6

[1]	Adjusted cost basis reflects adjustments for credit and other losses recognized in earnings on our structured finance security. Cumulative adjustments to the cost basis of securities held as of both December 31, 2012 and 2011 totaled $3.3 million. Par value of securities held as of both December 31, 2012 and 2011 totaled $17.9 million.
[2]	The Company’s auction rate securities maintain split ratings. For purposes of this table, securities are categorized according to their lowest rating.

Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

Schedule of Available-for-sale Securities [Line Items]

Securities Available For Sale (Auction Rate Securities Reconciliation Of Cost Basis To Fair Value) (Detail) - USD ($)
$ in Thousands

12 Months Ended

27 Months Ended

39 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2011

Dec. 31, 2012

Cumulative credit and other losses recognized in earnings

$ 0

$ 574

$ 1,164

Schedule of Available-for-sale Securities [Line Items]

Adjusted Cost Basis

^[1]

14,600

$ 14,600

Gross Cumulative Unrealized (Losses)/Gains

(200)

(1,000)

(200)

Fair Value

^[2]

14,400

13,600

14,400

Cumulative credit and other losses recognized in earnings

3,300

Asset-backed Securities [Member] | Auction Rate Securities [Member]

17,900

Schedule of Available-for-sale Securities [Line Items]

Adjusted Cost Basis

^[1]

12,900

Gross Cumulative Unrealized (Losses)/Gains

(1,200)

(1,000)

(1,200)

Fair Value

11,700

11,900

11,700

Collateralized Debt Obligations [Member] | Auction Rate Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Adjusted Cost Basis

^[1]

1,700

Gross Cumulative Unrealized (Losses)/Gains

1,000

Fair Value

2,700

1,700

$ 1,700

2,700

Cumulative credit and other losses recognized in earnings

$ 600

$ 1,200

3,300

$ 5,000

[1]	Adjusted cost basis reflects adjustments for credit and other losses recognized in earnings on our structured finance security. Cumulative adjustments to the cost basis of securities held as of both December 31, 2012 and 2011 totaled $3.3 million. Par value of securities held as of both December 31, 2012 and 2011 totaled $17.9 million.
[2]	The Company’s auction rate securities maintain split ratings. For purposes of this table, securities are categorized according to their lowest rating.

Accounts Receivable, Net Of Allowance (Schedule Of Accounts Receivable) (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Receivables [Abstract]
Contract billings	$ 522,000	$ 395,700
Retainage	113,500	41,700
Costs and earnings in excess of billings	252,800	228,700
Accounts receivable, gross	888,300	666,100
Less allowance for doubtful accounts	(11,200)	(7,600)	$ (8,300)
Accounts receivable, net	$ 877,131	$ 658,528

Total amount included in cost of uncompleted contracts in excess of related billings, or unbilled accounts receivable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 310
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6471842&loc=d3e55302-109406

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3(c)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 35
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57795-111642

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 35
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57807-111642

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 45
-Paragraph 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section A
-Paragraph 4, 21
-Chapter 11
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3
-Subparagraph c(2), c(3), c(4)
-Article 5

7.625% Senior Notes [Member]

Property And Equipment, Net (Schedule Of Property And Equipment, Net) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 631,300	$ 475,700
Less accumulated depreciation	(280,900)	(212,700)
Property and equipment, net	350,355	263,007
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	4,800	4,700
Building and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	15,400	12,500
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	518,300	381,600
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 92,800	$ 76,900
Minimum [Member] \| Building and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Minimum [Member] \| Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	2 years
Minimum [Member] \| Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Maximum [Member] \| Building and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	40 years
Maximum [Member] \| Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	15 years
Maximum [Member] \| Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	7 years

Accounts Receivable, Net of Allowance (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of year	$ 7,600	$ 8,300
Provision for doubtful accounts	6,970	2,016	$ 2,895
Amounts charged against the allowance	(3,300)	(2,700)
Allowance for doubtful accounts at end of year	11,200	7,600	$ 8,300
Segment, Continuing Operations [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Provision for doubtful accounts	$ 6,900	$ 2,000

Debt (Long Term Debt Instruments) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Capital lease obligations	$ 79,000
Capital lease obligations	82,200
Total debt	598,900	$ 494,800
Less current maturities	(52,596)	(34,050)
Long-term debt	$ 546,323	460,690
Line of Credit [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, expiration date	Aug. 22, 2016
Credit facility, amount outstanding	$ 134,000	60,000
7.625% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Feb. 01, 2017
Carrying value of debt	$ 150,000	150,000
Convertible Debt [Member] \| New 4.0% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jun. 15, 2014
Carrying value of debt	$ 100,900	98,200
Convertible Debt [Member] \| New 4.25% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Dec. 15, 2014
Carrying value of debt	$ 92,100	89,900
Convertible Debt [Member] \| Original 4.0% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jun. 15, 2014
Carrying value of debt	$ 9,700	9,700
Convertible Debt [Member] \| Original 4.25% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Dec. 15, 2014
Carrying value of debt	$ 3,000	3,000
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Lease expiration date	Jun. 30, 2019
Capital lease obligations	$ 79,000	40,600
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	May 31, 2018
Carrying value of debt	$ 30,200	$ 43,400

Property And Equipment, Net (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment, Continuing Operations [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 79.8	$ 60.2	$ 44.0

Accounts Receivable, Net Of Allowance (Narrative) (Detail) - Financing Receivable [Member] - Segment, Discontinued Operations [Member] - USD ($) $ in Millions	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable	$ 6.3	$ 6.8
Financing receivable, non-current portion	$ 4.3	$ 4.8

Debt (Long Term Debt Instruments) (Parenthetical) (Detail) - USD ($)
$ in Thousands

Dec. 31, 2012

Dec. 31, 2011

Mar. 31, 2011

Dec. 31, 2010

^[2]

Nov. 30, 2009

Jun. 30, 2009

Capital Lease Obligations [Member]

7.625%

Debt instrument, weighted average interest rate

2.90%

Notes Payable, Other Payables [Member]

Debt instrument, weighted average interest rate

4.00%

New 4.0% Notes [Member] | Convertible Debt [Member]

4.00%

New 4.25% Notes [Member] | Convertible Debt [Member]

^[1]

$ 105,322

4.25%

Original 4.0% Notes [Member] | Convertible Debt [Member]

^[1]

$ 97,000

97,000

4.00%

Original 4.25% Notes [Member] | Convertible Debt [Member]

$ 9,700

^[2]

9,700

^[2]

$ 115,000

4.25%

$ 3,000

^[2]

$ 3,000

^[2]

$ 100,000

[1]	Dilutive shares associated with the New Notes are attributable to the premium over the respective conversion prices.
[2]	Dilutive shares associated with the Original Notes are attributable to the underlying principal amounts.

Debt (Narrative) (Detail)
$ / shares in Units, $ in Thousands

1 Months Ended

3 Months Ended

12 Months Ended

15 Months Ended

Nov. 30, 2009

USD ($)

Jun. 30, 2009

USD ($)

Mar. 31, 2011

USD ($)

Dec. 31, 2012

USD ($)

$ / shares

Dec. 31, 2011

USD ($)

Dec. 31, 2010

USD ($)

Dec. 31, 2009

USD ($)

Mar. 31, 2011

USD ($)

Aug. 31, 2011

USD ($)

Convertible notes, guarantees description

In the ordinary course of its business, from time to time, MasTec guarantees the obligations of its subsidiaries, including obligations under certain contracts with customers, certain lease obligations and in some states, obligations in connection with obtaining contractors’ licenses.

Debt instrument, guarantees

Debt instrument, covenant compliance

MasTec was in compliance with all provisions and covenants pertaining to its outstanding debt instruments as of December 31, 2012 and 2011.

7.625% Senior Notes [Member]

Debt instrument, restrictive covenants

The indenture that governs the Senior Notes allows the Company to incur additional indebtedness to the extent that the Company’s fixed charge coverage ratio, as therein defined, is at least 2:1. The fixed charge coverage ratio is calculated as consolidated EBITDA for the most recent four fiscal quarters for which internal financial statements are available, divided by fixed charges for such four quarter period, as such terms are defined in the indenture. If the fixed charge coverage ratio is less than 2:1, the Company is still permitted to incur the following additional indebtedness, among others: credit facilities under a defined threshold, renewals to existing debt permitted under the indenture, capital lease obligations up to 5% of the Company’s consolidated net assets, plus an additional $50 million of indebtedness at any time the Senior Notes remain outstanding. The Senior Notes are guaranteed by certain of the Company’s operating subsidiaries.

Carrying value of debt

$ 150,000

Debt instrument, maturity date

Feb. 01, 2017

Financial Standby Letter of Credit [Member] | Minimum [Member]

Financial Standby Letter of Credit [Member] | Maximum [Member]

0.80%

Revolving Credit Facility [Member]

1.30%

Line of credit facility, borrowing capacity description

Subject to certain terms in the Credit Facility, the Company has the option to increase its revolving commitments and/or establish term loans of up to $200 million in total. Borrowings under the Credit Facility will be used to refinance existing indebtedness and for working capital, capital expenditures and other corporate purposes, including the repurchase or prepayment of indebtedness; however, the Credit Facility restricts the repurchase or prepayment of certain unsecured indebtedness, including the Company’s senior notes due 2017 and senior convertible notes due 2014, unless the Company has at least $50 million of remaining liquidity (as defined in the Credit Facility) after any such repurchase or prepayment.

Line of credit facility, covenant terms

Line of credit facility, interest rate description

Line of credit facility, commitment fee description

The Company must also pay a commitment fee to the lenders on any unused availability under the Credit Facility, which is equal to 0.25% to 0.45%, based on the Company’s consolidated leverage ratio as of the then most recent fiscal quarter.

Letters of credit issued

$ 120,800

$ 90,000

Line of credit facility, remaining borrowing capacity

$ 345,200

Unused credit facility fee

3.95%

2.94%

0.35%

Line of credit facility, collateral

Revolving Credit Facility [Member] | Previous Line Of Credit [Member]

Line of credit facility, maximum borrowing capacity

$ 260,000

Line of credit facility, expiration date

May 31, 2013

Revolving Credit Facility [Member] | Line of Credit [Member]

Line of credit facility, maximum borrowing capacity

$ 600,000

Line of credit facility, expiration date

Aug. 22, 2016

Credit facility, amount outstanding

$ 134,000

$ 60,000

Revolving Credit Facility [Member] | Minimum [Member]

Line of credit facility, leverage ratio

1.00

Line of credit facility, interest coverage ratio

1.00

Revolving Credit Facility [Member] | Minimum [Member] | Letter of Credit [Member]

Revolving Credit Facility [Member] | Minimum [Member] | Line of Credit [Member]

1.00%

Unused credit facility fee

0.25%

Revolving Credit Facility [Member] | Maximum [Member]

Line of credit facility, leverage ratio

3.50

Line of credit facility, interest coverage ratio

3.00

Revolving Credit Facility [Member] | Maximum [Member] | Letter of Credit [Member]

Line of credit facility, capacity available for issuance of letters of credit

$ 350,000

Revolving Credit Facility [Member] | Maximum [Member] | Line of Credit [Member]

2.00%

Unused credit facility fee

0.45%

Letter of Credit [Member] | Minimum [Member]

Letter of Credit [Member] | Maximum [Member]

1.50%

Line of credit facility, capacity available for issuance of letters of credit

$ 229,200

Original 4.0% Notes [Member] | Convertible Debt [Member]

2.50%

Debt instrument, exchanged amount

$ 105,300

Debt issuance cost

$ 5,400

Debt instrument, issuance date

Jun. 30, 2009

Debt instrument, payment terms

$ 115,000

$ 9,700

^[1]

$ 9,700

^[1]

$ 115,000

^[1]

The Original 4.0% Notes bear interest at a rate of 4.0% per year, payable semi-annually in arrears, on June 15 and December 15 of each year.

Debt instrument, convertible, conversion ratio | shares

63.4417

Debt instrument, convertible, conversion price per share | $ / shares

$ 15.76

Carrying value of debt

$ 9,700

9,700

Debt instrument, maturity date

Jun. 15, 2014

Original 4.25% Notes [Member] | Convertible Debt [Member]

Debt instrument, exchanged amount

$ 97,000

Debt issuance cost

$ 3,700

Debt instrument, issuance date

Nov. 30, 2009

Debt instrument, payment terms

$ 100,000

$ 3,000

^[1]

3,000

^[1]

100,000

^[1]

The Original 4.25% Notes bear interest at a rate of 4.25% per year, payable semi-annually in arrears, on June 15 and December 15 of each year.

Debt instrument, convertible, conversion ratio | shares

64.6162

Debt instrument, convertible, conversion price per share | $ / shares

$ 15.48

Carrying value of debt

$ 3,000

3,000

Debt instrument, maturity date

Dec. 15, 2014

Convertible Debt [Member] | Total New Senior Convertible Notes [Member]

Convertible notes, guarantees description

The 4.25% and 4.0% senior convertible notes are guaranteed by certain of the Company's 100%-owned direct and indirect domestic operating subsidiaries

Debt instrument, restrictive covenants

There are no financial covenants on these notes, however, there are certain nonfinancial provisions and covenants associated with these notes.

Convertible Debt [Member] | Original 4.0% Notes [Member]

Debt Instrument, convertible, latest date

Jun. 13, 2014

Convertible Debt [Member] | Original 4.25% Notes [Member]

Debt Instrument, convertible, latest date

Dec. 12, 2014

Total Exchanged Senior Convertible Notes [Member] | Convertible Debt [Member]

Debt instrument, exchanged amount

$ 0

202,322

$ 0

Total New Senior Convertible Notes [Member] | Convertible Debt [Member]

Debt instrument exchange fee

During the first quarter of 2011, the Company exchanged $105.3 million of its Original 4.0% Notes and $97.0 million of its Original 4.25% Notes for identical principal amounts of New 4.0% Notes and New 4.25% Notes, respectively, for an exchange fee of approximately 50 basis points, or 0.5%, of the aggregate principal amount of the notes exchanged.

Exchange fee incurred for debt conversion

$ 1,000

$ 700

Unamortized debt discount and financing costs

$ 17,400

Debt instrument, effective interest rate

6.73%

Total New Senior Convertible Notes [Member] | Weighted Average [Member] | Convertible Debt [Member]

Debt instrument, remaining discount amortization period

2 years

Total Remaining Original Convertible Notes [Member] | Convertible Debt [Member]

Aggregate Principal [Member] | Total New Senior Convertible Notes [Member] | Convertible Debt [Member]

$ 12,700

Debt instrument, basis spread, variable interest or fee

0.50%

Eurocurrency Rate [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Line of Credit [Member]

Debt instrument, basis spread, variable interest or fee

1.50%

Eurocurrency Rate [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Line of Credit [Member]

Debt instrument, basis spread, variable interest or fee

2.50%

Base Rate [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Line of Credit [Member]

Debt instrument, basis spread, variable interest or fee

0.50%

Base Rate [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Line of Credit [Member]

Debt instrument, basis spread, variable interest or fee

1.50%

Convertible Term 1 [Member] | Total New Senior Convertible Notes [Member] | Convertible Debt [Member]

Debt instrument, terms of conversion feature

Convertible Term 2 [Member] | Total New Senior Convertible Notes [Member] | Convertible Debt [Member]

Debt instrument, terms of conversion feature

Convertible Term 3 [Member] | Total New Senior Convertible Notes [Member] | Convertible Debt [Member]

Debt instrument, terms of conversion feature

Long-term Debt [Member]

Business combination, assumed debt

$ 20,600

$ 29,900

[1]	Dilutive shares associated with the Original Notes are attributable to the underlying principal amounts.

Debt (Schedule Of Convertible Notes, Carrying Amount Details) (Detail) - Convertible Debt [Member] - USD ($)
$ in Thousands

Dec. 31, 2012

Dec. 31, 2011

New 4.0% Notes [Member]

Unamortized debt discount and financing costs

^[1]

$ 105,322

(4,400)

(7,100)

Net carrying amount of debt component

100,900

98,200

Carrying amount of equity component

8,900

New 4.25% Notes [Member]

Unamortized debt discount and financing costs

^[1]

97,000

(4,900)

(7,100)

Net carrying amount of debt component

92,100

89,900

Carrying amount of equity component

$ 8,500

[1]	Dilutive shares associated with the New Notes are attributable to the premium over the respective conversion prices.

Debt (Schedule Of Interest Expense, Net, Details) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Interest expense, net	$ 37,376	$ 34,466	$ 29,178
Segment, Continuing Operations [Member]
Debt Instrument [Line Items]
Contractual and other interest expense	27,500	26,100	26,600
Accretion of senior convertible note discount	4,900	4,200	0
Deferred financing costs and commitment fees	5,400	4,700	3,600
Total interest expense	37,800	35,000	30,200
Interest income	(400)	(500)	(1,000)
Interest expense, net	$ 37,376	$ 34,466	$ 29,178

Debt Debt (Schedule Of Maturities Of Debt And Capital Leases) (Details) - USD ($) $ in Millions	Dec. 31, 2012	Dec. 31, 2011
Maturities of Long-term Debt [Abstract]
2013	$ 52.6
2014	233.9
2015	18.4
2016	141.6
2017	152.0
Thereafter	0.4
Total debt	$ 598.9	$ 494.8

Lease Obligations (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Capital Leases [Line Items]
Assets held under capital lease, net	$ 102,200	$ 27,700
Machinery and Equipment [Member]
Capital Leases [Line Items]
Conversion of leases from operating to capital	0	23,366	$ 0
Segment, Continuing Operations [Member]
Capital Leases [Line Items]
Operating leases, rent expense	$ 222,500	$ 168,800	$ 129,300

Lease Obligations (Minimum future lease commitments) (Details) $ in Millions	Dec. 31, 2012 USD ($)
Operating Lease Obligations [Abstract]
Operating leases, future minimum payments due, next twelve months	$ 37.2
Operating leases, future minimum payments, due in two years	23.4
Operating leases, future minimum payments, due in three years	14.6
Operating leases, future minimum payments, due in four years	7.0
Operating leases, future minimum payments, due in five years	4.0
Operating leases, future minimum payments, due thereafter	0.8
Operating leases, future minimum payments due	87.0
Capital Lease Obligations [Abstract]
Capital leases, future minimum payments due, next twelve months	31.2
Capital leases, future minimum payments due in two years	21.5
Capital leases, future minimum payments due in three years	16.5
Capital leases, future minimum payments due in four years	9.0
Capital leases, future minimum payments due in five years	3.6
Capital leases, future minimum payments due thereafter	0.4
Capital leases, future minimum payments due	82.2
Capital leases, future minimum payments, interest included in payments	(3.2)
Capital lease obligations	79.0
Capital lease obligations, current	(31.0)
Capital lease obligations, noncurrent	$ 48.0

Stock-Based Compensation and Other Employee Benefit Plans (Narrative) (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jul. 02, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of vested restricted share awards		$ 7,300,000	$ 11,100,000	$ 1,200,000
Intrinsic value of options exercised		5,100,000	10,300,000	800,000
Proceeds from stock option exercises		3,700,000	11,600,000	2,600,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned compensation	$ 8,300,000	$ 8,300,000
Unearned compensation, weighted average expected recognition period, in years		2 years
2011 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for purchase					1,000,000
Shares available for grant	3,947,895	3,947,895
Employee stock purchase plan description		Under the 2011 ESPP, eligible employees can purchase MasTec, Inc. common stock at a 15% discount through after-tax payroll deductions, allocating from 1% to 15% of their compensation each pay period. Eligible employees can also make lump sum purchases. Stock purchases under the 2011 ESPP are subject to a quarterly maximum of 5,000 shares per employee, and on an annual basis, the value of stock purchased cannot exceed $25,000 per employee.
Common stock purchase discount		15.00%
401(K) Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
401(K) plan description		Subject to certain dollar limits, eligible employees may contribute up to 75% of their pre-tax annual compensation to the 401(k) plan. Effective January 1, 2011, MasTec increased its 100% match of employee contributions from 1% to 2.5% of the employee’s salary, capped at $2,500 per employee. Effective January 1, 2011, matching contributions are payable annually, 50% in shares of MasTec common stock and 50% in cash.
Employer matching contributions		$ 2,100,000	1,700,000	$ 800,000
Deferred Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation plan description		These employees are allowed to contribute a percentage of their pre-tax annual compensation to the deferred compensation plan. Effective January 1, 2011, MasTec increased its 100% match of employee contributions from 1% to 2.5% of the employee’s salary, capped at $2,500 per employee. Effective January 1, 2011, matching contributions are payable annually. Currently, management intends to provide for matching contributions in cash, however, matching contributions can also be provided for 50% in shares of MasTec common stock and 50% in cash, at MasTec’s election.
Deferred compensation plan assets			2,600,000
Deferred compensation plan liabilities	$ 3,300,000	$ 3,300,000	$ 2,200,000
Minimum [Member] \| 401(K) Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percent		1.00%
Minimum [Member] \| Deferred Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percent		1.00%
Maximum [Member] \| 2011 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares per employee per quarter	5,000
Maximum [Member] \| 401(K) Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percent		2.50%
Maximum annual contribution per employee, amount		$ 2,500
Maximum [Member] \| Deferred Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percent		2.50%
Maximum annual contribution per employee, amount		$ 2,500
Noncurrent [Member] \| Deferred Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation plan assets	$ 3,200,000	$ 3,200,000

Stock-Based Compensation And Other Employee Benefit Plans (Summary Of Restricted Shares Awards) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Restricted Shares, Number of Shares [Roll Forward]
Non-vested restricted shares, beginning balance	716,780	1,009,777
Restricted shares - granted	397,623	364,784
Restricted shares - vested	(347,889)	(646,531)
Restricted shares - canceled/forfeited	(11,500)	(11,250)
Non-vested restricted shares, ending balance	755,014	716,780
Restricted Shares, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant date fair value, beginning balance	$ 14.45	$ 9.32
Weighted average grant date fair value - granted	21.22	17.06
Weighted average grant date fair value - vested	12.68	8.00
Weighted average grant date fair value - canceled/forfeited	15.02	9.80
Weighted average grant date fair value, ending balance	$ 18.82	$ 14.45

Stock-Based Compensation And Other Employee Benefit Plans (Summary of Stock Options) (Details) - USD ($)
$ / shares in Units, $ in Millions

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Stock Options Outstanding [Roll Forward]

Stock options outstanding shares, vested and expected to vest, beginning balance

2,588,170

Stock options outstanding shares, vested, beginning balance

1,445,774

Stock options exercised, shares

(391,949)

(1,132,396)

Stock options canceled/forfeited, shares

(10,000)

Stock options outstanding shares, vested, ending balance

1,053,825

1,445,774

Weighted Average Exercise Price [Roll Forward]

Weighted average exercise price, vested and expected to vest, beginning balance

$ 10.27

Weighted average exercise price, vested, beginning balance

$ 10.25

Weighted average exercise price, exercised

9.46

10.25

Weighted average exercise price, canceled/forfeited

0.00

13.95

Weighted average exercise price, vested, ending balance

$ 10.55

$ 10.25

Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]

Stock options exercisable, shares

1,053,825

1,445,774

Stock options exercisable, weighted average exercise price

$ 10.55

$ 10.25

Stock options outstanding, vested and expected to vest, weighted average remaining contractual life

3 years 10 months 13 days

Stock options outstanding, vested, weighted average remaining contractual life

2 years 3 months 22 days

3 years 1 month 28 days

Stock options exercisable, weighted average remaining contractual life

2 years 3 months 22 days

3 years 1 month 28 days

Stock options outstanding, aggregate intrinsic value, vested and expected to vest

^[1]

$ 11.2

Stock options outstanding, aggregate intrinsic value, vested

^[1]

$ 15.2

$ 10.3

Stock options exercisable, aggregate intrinsic value

^[1]

$ 15.2

$ 10.3

[1]	Amount represents the difference between the exercise price and the market price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.

Stock-Based Compensation and Other Employee Benefit Plans (Summary Of Stock-Based Compensation Expense And Related Tax Benefits) (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Income tax benefit from stock-based compensation

$ 4,433

$ 3,573

$ 3,872

2,500

6,300

1,000

Restricted Stock [Member]

^[1]

759

7,766

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Income tax benefit from stock-based compensation

4,400

3,600

3,800

1,800

3,400

1,300

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

^[1]

100

2,100

Stock Options [Member]

Income tax benefit from stock-based compensation

100

700

2,900

(300)

^[1]

$ 700

$ 5,700

$ 0

[1]	Excess tax benefits, which represent cash flows from tax deductions in excess of compensation expense recognized for stock options exercised and vested restricted shares, are classified as financing cash flows in the Company’s consolidated statements of cash flows.

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Other Retirement Plans Other Retirement Plans (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2012 USD ($)
Multiemployer Plans [Line Items]
Multiemployer plans, underfunded status, description	A multi-employer plan that is so underfunded as to be in “endangered” or “critical” status is required to adopt a funding improvement plan (“FIP”) or a rehabilitation plan (“RP”), which, among other actions, could include decreased benefits and increased contributions. These actions are intended to improve their funding status over a period of years. If a pension fund is in critical status, a participating employer must pay an automatic surcharge in addition to contributions otherwise required under the collective bargaining agreement (“CBA”). With some exceptions, the surcharge is equal to 5% of required contributions for the initial critical year, and 10% for each succeeding plan year in which the plan remains in critical status. The surcharge ceases on the effective date of a CBA (or other agreement) that includes contribution and benefit terms consistent with the rehabilitation plan.
Multiemployer plans, employees increase (decrease), description	In addition, the number of union employees employed at any given time, and the plans in which they may participate, varies depending upon the location and number of ongoing projects at a given time and the need for union resources in connection with those projects.
Multiemployer plans, withdrawal liability	$ 6.4
EC Source [Member]
Multiemployer Plans [Line Items]
Multiemployer plans, business combination or divestiture, description	The average number of employees covered under multi-employer plans in which the Company participates increased in 2011 due to the acquisition of EC Source.
Multiemployer Plans, Pension [Member]
Multiemployer Plans [Line Items]
Multiemployer plans, underfunded status, description	The Pension Protection Act requires that underfunded pension plans improve their funding ratios within prescribed intervals based on the level of their underfunding. In addition, if a multi-employer defined benefit plan fails to satisfy certain minimum funding requirements, the Internal Revenue Service may impose on the employers contributing to such plan a nondeductible excise tax of 5% on the amount of the accumulated funding deficiency.
Multiemployer Plans, Pension [Member] \| Teamsters National Pipeline Pension Fund [Member]
Multiemployer Plans [Line Items]
Multiemployer plans, information not available	Information not available as of December 31, 2012. The Teamsters National Pipeline Pension Fund was established in 2012.
Multiemployer Plans, Pension [Member] \| Central States Southeast And Southwest Areas Pension Fund [Member]
Multiemployer Plans [Line Items]
Multiemployer plans, withdrawal liability	$ 6.4

Other Retirement Plans Other Retirement Plans (Schedule of Significant Multiemployer Plans) (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Other Multi Employer Pension Plans [Member]

$ 29.1

$ 20.7

$ 22.6

Multiemployer Plans, Pension [Member]

2.1

1.5

1.4

Multiemployer Plans, Pension [Member] | Pipeline Industry Pension Fund [Member]

27.9

19.4

21.7

Multiemployer plans, period contributions, significance of contributions

$ 8.9

$ 6.2

10.3

true

Multiemployer plans, collective bargaining arrangement, expiration date

May 31, 2014

736146433

001

Green

Multiemployer plans, certified zone status, extended amortization provisions

Dec. 31, 2011

Dec. 31, 2010

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Multiemployer Plans, Pension [Member] | Central Pension Fund Of International Union Of Operating Engineers And Participating Employers [Member]

Multiemployer plans, period contributions, significance of contributions

$ 6.0

$ 4.4

4.9

false

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

366052390

001

Green

Multiemployer plans, certified zone status, extended amortization provisions

Jan. 31, 2012

Jan. 31, 2011

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Multiemployer Plans, Pension [Member] | Laborers National Pension Fund [Member]

Multiemployer plans, period contributions, significance of contributions

$ 1.5

$ 0.5

0.2

false

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

751280827

001

Green

Multiemployer plans, certified zone status, extended amortization provisions

Dec. 31, 2011

Dec. 31, 2010

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Multiemployer Plans, Pension [Member] | Teamsters National Pipeline Pension Fund [Member]

Multiemployer plans, collective bargaining arrangement, expiration date

$ 1.4

$ 0.0

0.0

Jan. 31, 2014

461102851

001

Multiemployer Plans, Pension [Member] | Eighth District Electrical Pension Fund [Member]

^[1]

Multiemployer plans, period contributions, significance of contributions

$ 1.2

$ 0.5

0.0

false

Multiemployer plans, collective bargaining arrangement, expiration date

Feb. 28, 2013

846100393

001

Green

Multiemployer plans, certified zone status, extended amortization provisions

Mar. 31, 2012

Mar. 31, 2011

true

Multiemployer plans, funding improvement plan and rehabilitation plan

Implemented

Multiemployer Plans, Pension [Member] | West Virginia Laborers Pension Trust Fund [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.9

$ 0.4

0.0

false

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

556026775

001

Green

Multiemployer plans, certified zone status, extended amortization provisions

Mar. 31, 2012

Mar. 31, 2011

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Multiemployer Plans, Pension [Member] | Michigan Laborers Pension Fund [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.9

$ 0.2

0.2

false

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

386233976

001

Green

Yellow

Multiemployer plans, certified zone status, extended amortization provisions

Aug. 31, 2012

Aug. 31, 2011

true

Multiemployer plans, funding improvement plan and rehabilitation plan

Multiemployer Plans, Pension [Member] | Operating Engineers Local 324 Pension Fund [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.8

$ 0.0

0.0

false

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

381900637

001

Red

Multiemployer plans, certified zone status, extended amortization provisions

Apr. 30, 2012

Apr. 30, 2011

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Implemented

Multiemployer Plans, Pension [Member] | Laborers Local Union No. 158 Pension Fund [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.6

$ 0.7

0.4

true

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

236580323

001

Green

Multiemployer plans, certified zone status, extended amortization provisions

Dec. 31, 2011

Dec. 31, 2010

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Multiemployer Plans, Pension [Member] | Laborers District Council Of West Pennsylvania Pension Fund [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.6

$ 0.3

0.2

false

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

256135576

001

Red

Yellow

Multiemployer plans, certified zone status, extended amortization provisions

Dec. 31, 2012

Dec. 31, 2011

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Implemented

Multiemployer Plans, Pension [Member] | International Brotherhood Of Electrical Workers Local 1249 Pension Plan [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.6

$ 0.3

0.0

false

Multiemployer plans, collective bargaining arrangement, expiration date

May 05, 2013

156035161

001

Red

Multiemployer plans, certified zone status, extended amortization provisions

Dec. 31, 2011

Dec. 31, 2010

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Implemented

Multiemployer Plans, Pension [Member] | International Union Of Operating Engineers Local 132 Pension Fund [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.5

$ 0.3

0.0

false

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

556015364

001

Green

Multiemployer plans, certified zone status, extended amortization provisions

Mar. 31, 2012

Mar. 31, 2011

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Multiemployer Plans, Pension [Member] | Operating Engineers Construction Industry and Miscellaneous Pension Fund [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.5

$ 0.1

0.2

false

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

256135579

001

Green

Yellow

Multiemployer plans, certified zone status, extended amortization provisions

Dec. 31, 2011

Dec. 31, 2010

true

Multiemployer plans, funding improvement plan and rehabilitation plan

Implemented

Multiemployer Plans, Pension [Member] | International Union Of Operating Engineers Pension Fund Of Eastern Pennsylvania And Delaware [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.5

0.3

false

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

236405239

001

Red

Green

Multiemployer plans, certified zone status, extended amortization provisions

Dec. 31, 2012

Dec. 31, 2011

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Pending

Multiemployer Plans, Pension [Member] | Minnesota Laborers Pension Fund [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.4

$ 0.3

1.0

false

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

416159599

001

Green

Multiemployer plans, certified zone status, extended amortization provisions

Dec. 31, 2011

Dec. 31, 2010

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Multiemployer Plans, Pension [Member] | National Electrical Benefit Fund [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.3

$ 0.2

0.2

false

Multiemployer plans, collective bargaining arrangement, expiration date

May 05, 2013

530181657

001

Green

Multiemployer plans, certified zone status, extended amortization provisions

Dec. 31, 2011

Dec. 31, 2010

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Multiemployer Plans, Pension [Member] | Southwestern Pennsylvania and Western Maryland Teamsters and Employers Pension Fund [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.3

$ 0.1

0.0

false

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

251046087

001

Red

Multiemployer plans, certified zone status, extended amortization provisions

Jun. 30, 2012

Jun. 30, 2011

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Implemented

Multiemployer Plans, Pension [Member] | Laborers Pension Trust Fund For Northern Nevada [Member]

$ 0.2

$ 0.8

0.4

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

880138600

001

Green

Multiemployer plans, certified zone status, extended amortization provisions

May 31, 2012

May 31, 2011

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Multiemployer Plans, Pension [Member] | Operating Engineers Pension Trust Fund [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.0

$ 1.2

1.0

false

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

946090764

001

Orange

Multiemployer plans, certified zone status, extended amortization provisions

Dec. 31, 2011

Dec. 31, 2010

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Implemented

Multiemployer Plans, Pension [Member] | Central States Southeast And Southwest Areas Pension Plan [Member]

Multiemployer plans, period contributions, significance of contributions

^[2]

$ 0.0

$ 0.9

0.8

^[2]

false

Multiemployer plans, collective bargaining arrangement, expiration date

^[2]

^[2]

Jan. 31, 2014

^[2]

366044243

^[2]

001

^[2]

Red

Multiemployer plans, certified zone status, extended amortization provisions

^[2]

Dec. 31, 2011

Dec. 31, 2010

^[2]

false

Multiemployer plans, funding improvement plan and rehabilitation plan

^[2]

Implemented

Multiemployer Plans, Pension [Member] | Western Conference Of Teamsters Pension Plan [Member]

Multiemployer plans, period contributions, significance of contributions

$ 0.0

$ 0.4

0.3

false

Multiemployer plans, collective bargaining arrangement, expiration date

Jan. 31, 2014

916145047

001

Green

Multiemployer plans, certified zone status, extended amortization provisions

Dec. 31, 2011

Dec. 31, 2010

false

Multiemployer plans, funding improvement plan and rehabilitation plan

Multiemployer Plans, Postretirement Benefit [Member]

Multiemployer Plans, Postretirement Benefit [Member] | New England Electrical Workers Money Purchase Plan And Trust [Member]

$ 1.2

$ 1.3

0.9

^[3]

$ 0.7

0.7

0.5

Multiemployer plans, collective bargaining arrangement, expiration date

^[3]

^[3],[4]

Aug. 30, 2012

Multiemployer Plans, Postretirement Benefit [Member] | National Electrical Annuity Plan [Member]

^[3]

$ 0.3

$ 0.4

Multiemployer plans, collective bargaining arrangement, expiration date

^[3]

^[3]

Sep. 05, 2015

[1]	Information not available as of December 31, 2012. The Teamsters National Pipeline Pension Fund was established in 2012.
[2]	The Company’s subsidiary that participated in the Central States, Southeast and Southwest Areas Pension Plan voluntarily withdrew from this plan in November 2011. See additional discussion below and in Note 17 – Commitment and Contingencies.
[3]	These plans are defined contribution multi-employer pension plans; therefore, PPA zone status disclosures in table below are not applicable.
[4]	The collective bargaining agreement associated with the New England Electrical Workers Money Purchase Plan is under negotiation as of December 31, 2012.

Other Retirement Plans Other Retirement Plans (Schedule of Costs of Multiemployer Plans) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2012 USD ($) employee	Dec. 31, 2011 USD ($) employee	Dec. 31, 2010 USD ($) employee
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions	$ 29.1	$ 20.7	$ 22.6
Multiemployer Plans, Pension [Member]
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions	27.9	19.4	21.7
Multiemployer Plans, Postretirement Benefit [Member]
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions	$ 1.2	$ 1.3	$ 0.9
Workforce Subject to Collective Bargaining Arrangements [Member] \| Maximum [Member]
Multiemployer Plans [Line Items]
Entity number of employees during period \| employee	2,509	1,538	1,111
Workforce Subject to Collective Bargaining Arrangements [Member] \| Minimum [Member]
Multiemployer Plans [Line Items]
Entity number of employees during period \| employee	308	308	254

Common Stock Activity (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Jul. 31, 2012	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock repurchase program, amount authorized			$ 150,000
Treasury stock acquired, shares	2.0	2.9			4.6
Treasury stock acquired, value	$ 31,200	$ 43,800		$ 75,000	$ 75,000

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

Common Stock Activity (Summary of Share Activity) (Details) - shares	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2012	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Rollforward of Share Activity, Common and Treasury Shares
Treasury shares, beginning balance			4,593,663
Shares issued for stock options exercises			391,949	1,132,396
Common stock repurchases	2,000,000	2,900,000		4,600,000
Treasury shares, ending balance			9,467,286	4,593,663
Common Stock [Member]
Rollforward of Share Activity, Common and Treasury Shares
Beginning balance, shares			80,569,000	78,215,000
Shares issued for stock options exercises			391,949	1,132,396	231,599
Shares issued for restricted stock awards			348,000	647,000
Other shares issued			13,000	39,000
Shares issued for acquisition of business				5,129,642	1,875,000
Common stock repurchases			4,873,623	4,593,663
Ending balance, shares			76,448,000	80,569,000	78,215,000
Treasury Stock [Member]
Rollforward of Share Activity, Common and Treasury Shares
Beginning balance, shares			(4,593,663)	0	0
Treasury shares, beginning balance			4,593,663	0
Common stock repurchases			4,873,623	4,593,663
Ending balance, shares			(9,467,286)	(4,593,663)	0
Treasury shares, ending balance			9,467,286	4,593,663	0

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
(Benefit from) provision for income taxes, discontinued operations	$ (4.5)	$ 6.2	$ 15.6
Valuation allowance	2.0	2.8
Operating loss carryforward	10.6	$ 11.5
State [Member]
Operating loss carryforward	$ 6.9
Operating loss caryforwards, expiration dates	may be carried forward between 5 and 20 years
Foreign [Member]
Operating loss carryforward	$ 3.7
Operating loss caryforwards, expiration dates	begin to expire in 2015

Quarterly Financial Information Disclosure [Abstract]

Income Taxes (Schedule of Components of Provision for Income Taxes) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Current federal	$ 48,700	$ 21,900	$ 2,700
Current foreign	300	100	0
Current state and local	12,400	1,300	3,300
Total current income tax expense	61,400	23,300	6,000
Deferred federal	15,200	35,000	40,800
Deferred foreign	1,100	(1,700)	0
Deferred state and local, net of valuation provisions	(1,600)	5,200	1,100
Total deferred income tax expense	14,700	38,500	41,900
Provision for income taxes	$ 76,080	$ 61,824	$ 47,942

Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2012	Dec. 31, 2011
Accrued self insurance	$ 22.4	$ 16.3
Operating loss carryforward	10.6	11.5
Compensation and benefits	8.3	12.3
Property and equipment	7.8	7.2
Bed debts	3.9	2.5
Other	9.9	9.0
Valuation allowance	(2.0)	(2.8)
Total deferred tax assets	60.9	56.0
Property and equipment	70.4	61.5
Goodwill	32.8	34.6
Other intangible assets	26.7	34.3
Other	19.5	14.9
Total deferred tax liabilities	177.0	168.0
Deferred tax liabilities, net	(116.1)	(112.0)
Noncontrolling Interest and Earnings Losses Equity Investments [Member] \| E C Source Services Llc Investee [Member]
Deferred tax liabilities, tax deferred income	11.1	11.1
Trade Accounts Receivable [Member]
Deferred tax liabilities, tax deferred income	$ 16.5	$ 11.6

Income Taxes (Schedule of Net Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Liabilities, Net [Abstract]
Net current deferred tax assets	$ 3,276	$ 10,596
Net deferred tax liabilities	(119,388)	(122,614)
Deferred tax liabilities, net	$ (116,100)	$ (112,000)

Income Taxes (Reconciliation Of Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S. statutory federal rate applied to pretax income	35.00%	35.00%	35.00%
State and local income taxes, net of federal benefit	3.40%	3.50%	3.20%
Foreign tax rate differential	(0.40%)	0.10%	0.10%
Non-deductible expenses	2.10%	1.70%	3.80%
Domestic production activities deduction	(1.60%)	(0.90%)	(0.10%)
Other	1.20%	0.00%	1.10%
Change in valuation allowance for deferred tax assets	(0.40%)	(0.80%)	(0.10%)
Effective income tax rate	39.50%	38.80%	42.00%
State and Local Jurisdiction [Member]
Change in state tax rate	0.20%	0.20%	(1.00%)

Segments and Operations by Geographic Area Segments and Operations by Geographic Area (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenue	$ 932,300	$ 1,067,300	$ 988,900	$ 738,300	$ 731,600	$ 816,200	$ 709,900	$ 573,600	$ 3,726,789	$ 2,831,292	$ 2,143,024
Amortization									12,200	13,900
Total assets	2,407,934				2,094,705				2,407,934	2,094,705	1,655,800
Capital expenditures									79,686	71,710	30,383
Segment, Continuing Operations [Member]
Segment Reporting Information [Line Items]
Revenue									3,726,800	2,831,300	2,143,000
EBITDA									322,100	267,900	200,100
Depreciation									79,800	60,200	44,000
Amortization									12,200	13,900	12,900
Total assets	2,381,700				1,942,400				2,381,700	1,942,400	1,508,700
Capital expenditures									79,400	71,000	27,800
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Revenue									(1,900)	(800)	(3,000)
EBITDA									0	0	0
Depreciation									0	0	0
Amortization									0	0	0
Total assets	15,000				(10,200)				15,000	(10,200)	(9,600)
Capital expenditures									0	0	0
Communications [Member] \| Reportable Segment [Member]
Segment Reporting Information [Line Items]
Revenue									1,772,700	1,635,100	1,190,600
EBITDA									192,000	154,300	107,900
Depreciation									27,000	22,700	13,400
Amortization									2,100	1,800	800
Total assets	829,200				837,100				829,200	837,100	598,300
Capital expenditures									19,200	23,000	11,600
Oil and Gas [Member] \| Reportable Segment [Member]
Segment Reporting Information [Line Items]
Revenue									959,000	774,300	562,600
EBITDA									99,400	80,100	111,300
Depreciation									39,600	26,800	20,800
Amortization									2,500	4,000	7,200
Total assets	805,500				494,600				805,500	494,600	392,200
Capital expenditures									40,300	25,700	10,500
Electrical Transmission [Member] \| Reportable Segment [Member]
Segment Reporting Information [Line Items]
Revenue									312,200	198,300	67,000
EBITDA									38,700	28,700	(3,700)
Depreciation									6,000	4,000	3,100
Amortization									5,000	4,400	100
Total assets	309,900				253,700				309,900	253,700	38,500
Capital expenditures									11,500	9,300	0
Power Generation and Industrial [Member] \| Reportable Segment [Member]
Segment Reporting Information [Line Items]
Revenue									668,100	219,600	325,600
EBITDA									32,000	(3,200)	16,900
Depreciation									4,100	3,900	4,300
Amortization									2,600	3,700	4,600
Total assets	321,600				269,400				321,600	269,400	283,800
Capital expenditures									5,600	4,600	3,100
All Other Segments [Member] \| Reportable Segment [Member]
Segment Reporting Information [Line Items]
Revenue									16,700	4,800	200
EBITDA									2,000	400	(1,000)
Depreciation									100	100	0
Amortization									0	0	0
Total assets	7,000				3,800				7,000	3,800	900
Capital expenditures									0	0	100
Corporate [Member] \| Reportable Segment [Member]
Segment Reporting Information [Line Items]
Revenue									0	0	0
EBITDA									(42,000)	7,600	(31,300)
Depreciation									3,000	2,700	2,400
Amortization									0	0	200
Total assets	$ 93,500				$ 94,000				93,500	94,000	204,600
Capital expenditures									$ 2,900	$ 8,500	$ 2,500

Segments and Operations by Geographic Area Segments and Operations by Geographic Area (Reconciliation of EBITDA to Consolidated Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense, net	$ (37,376)	$ (34,466)	$ (29,178)
Amortization	(12,200)	(13,900)
Income from continuing operations before provision for income taxes	192,719	159,280	114,072
Segment, Continuing Operations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
EBITDA	322,100	267,900	200,100
Interest expense, net	(37,376)	(34,466)	(29,178)
Depreciation	(79,800)	(60,200)	(44,000)
Amortization	$ (12,200)	$ (13,900)	$ (12,900)

Segments and Operations by Geographic Area Segments and Operations by Geographic Area (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 2,407,934	$ 2,094,705	$ 1,655,800
Current assets of discontinued operations	18,591	30,608	43,100
Long-term assets of discontinued operations	7,648	121,695	104,000
Segment, Continuing Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 2,381,700	$ 1,942,400	$ 1,508,700

Segments and Operations by Geographic Area Segments and Operations by Geographic Area (Schedule of Significant Customers, Revenue Concentration) (Details) - Segment, Continuing Operations [Member] - Reportable Segment [Member] - Customer Concentration Risk [Member] - Communications [Member]	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Direct Tv [Member]
Segment Reporting Information [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	17.00%	20.00%	20.00%
At T [Member]
Segment Reporting Information [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	18.00%	24.00%	22.00%

Segments and Operations by Geographic Area Segments and Operations by Geographic Area (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Nov. 30, 2010	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Number of reportable segments										5
Gain on remeasurement of equity interest in acquiree										$ 0	$ 29,041	$ 0
Payments to acquire equity method investments										0	0	10,854
Revenue		$ 932,300	$ 1,067,300	$ 988,900	$ 738,300	$ 731,600	$ 816,200	$ 709,900	$ 573,600	3,726,789	2,831,292	2,143,024
Property and equipment, net		350,355				263,007				350,355	263,007
Goodwill and other intangible assets, net		957,441				825,467				957,441	825,467	596,500
Pending Litigation [Member] \| Sintel [Member]
Segment Reporting Information [Line Items]
Pending or threatened litigation, estimated loss										9,600
EC Source [Member]
Segment Reporting Information [Line Items]
Gain on remeasurement of equity interest in acquiree								$ 29,000
E C Source Services Llc Investee [Member]
Segment Reporting Information [Line Items]
Payments to acquire equity method investments	$ 10,000
Reportable Segment [Member] \| Communications [Member]
Segment Reporting Information [Line Items]
Revenue										1,772,700	1,635,100	1,190,600
Foreign Operation [Member] \| Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Property and equipment, net		12,900				12,700				12,900	12,700
Goodwill and other intangible assets, net		30,500				30,000				30,500	30,000
Segment, Continuing Operations [Member]
Segment Reporting Information [Line Items]
Revenue										3,726,800	2,831,300	2,143,000
Segment, Continuing Operations [Member] \| Foreign Operation [Member] \| Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Revenue										156,800	91,500	200
Segment, Continuing Operations [Member] \| UNITED STATES \| Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Revenue										3,570,000	2,739,800	2,100,000
Segment, Discontinued Operations [Member] \| Foreign Operation [Member] \| Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Revenue										5,800	12,400	2,700
Property and equipment, net		1,500				1,600				1,500	1,600
Goodwill and other intangible assets, net		$ 0				$ 0				0	0
Segment, Discontinued Operations [Member] \| UNITED STATES \| Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Revenue										$ 73,100	$ 165,300	$ 162,300
Sales Revenue, Services, Net [Member] \| Utilities [Member] \| Segment, Continuing Operations [Member] \| Reportable Segment [Member] \| Communications [Member]
Segment Reporting Information [Line Items]
Entity-wide revenue by customer type, percentage										8.00%	9.00%	11.00%

Commitments And Contingencies (Narrative) (Detail) € in Millions, $ in Millions	12 Months Ended				95843 Months Ended	95855 Months Ended
	Dec. 31, 2012 EUR (€)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 30, 9999 USD ($)	Dec. 30, 9999 USD ($)	Oct. 31, 2012 USD ($)	Sep. 30, 2012 USD ($)
Commitment And Contingencies [Line Items]
Multiemployer plans, collective bargaining arrangement, description	Certain of MasTec’s subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees. The agreements require the subsidiaries party to the agreements to pay specified wages, provide certain benefits to their union employees and contribute certain amounts to multi-employer pension plans and employee benefit trusts. The multi-employer pension plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls.	Certain of MasTec’s subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees. The agreements require the subsidiaries party to the agreements to pay specified wages, provide certain benefits to their union employees and contribute certain amounts to multi-employer pension plans and employee benefit trusts. The multi-employer pension plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls.
Multiemployer plans, collective bargaining arrangement, expiration date, description	The collective bargaining agreements expire at various times and have typically been renegotiated and renewed on terms similar to the ones contained in the expiring agreements.	The collective bargaining agreements expire at various times and have typically been renegotiated and renewed on terms similar to the ones contained in the expiring agreements.
Underfunded multi-employer pension plans, funding requirements and penalties, description	A multi-employer plan that is so underfunded as to be in “endangered” or “critical” status is required to adopt a funding improvement plan (“FIP”) or a rehabilitation plan (“RP”), which, among other actions, could include decreased benefits and increased contributions. These actions are intended to improve their funding status over a period of years. If a pension fund is in critical status, a participating employer must pay an automatic surcharge in addition to contributions otherwise required under the collective bargaining agreement (“CBA”). With some exceptions, the surcharge is equal to 5% of required contributions for the initial critical year, and 10% for each succeeding plan year in which the plan remains in critical status. The surcharge ceases on the effective date of a CBA (or other agreement) that includes contribution and benefit terms consistent with the rehabilitation plan.	A multi-employer plan that is so underfunded as to be in “endangered” or “critical” status is required to adopt a funding improvement plan (“FIP”) or a rehabilitation plan (“RP”), which, among other actions, could include decreased benefits and increased contributions. These actions are intended to improve their funding status over a period of years. If a pension fund is in critical status, a participating employer must pay an automatic surcharge in addition to contributions otherwise required under the collective bargaining agreement (“CBA”). With some exceptions, the surcharge is equal to 5% of required contributions for the initial critical year, and 10% for each succeeding plan year in which the plan remains in critical status. The surcharge ceases on the effective date of a CBA (or other agreement) that includes contribution and benefit terms consistent with the rehabilitation plan.
Multiemployer plans, withdrawal liability		$ 6.4
Other guarantees, description	In the ordinary course of its business, from time to time, MasTec guarantees the obligations of its subsidiaries, including obligations under certain contracts with customers, certain lease obligations and in some states, obligations in connection with obtaining contractors’ licenses.	In the ordinary course of its business, from time to time, MasTec guarantees the obligations of its subsidiaries, including obligations under certain contracts with customers, certain lease obligations and in some states, obligations in connection with obtaining contractors’ licenses.
Aon Risk Services Inc [Member] \| Insurance Settlement [Member]
Commitment And Contingencies [Line Items]
Former gain contingency, recognized in period							$ 3.5
Workers Compensation Policy [Member]
Commitment And Contingencies [Line Items]
Per claim deductible, insurance policies		$ 1.0
General Liability Policy [Member]
Commitment And Contingencies [Line Items]
Per claim deductible, insurance policies		2.0
Automobile Liability Policy [Member]
Commitment And Contingencies [Line Items]
Per claim deductible, insurance policies		2.0
Umbrella Policy [Member]
Commitment And Contingencies [Line Items]
Maximum coverage, per claim and aggregate		$ 100.0
Pending Litigation [Member] \| Sintel [Member]
Commitment And Contingencies [Line Items]
Legal proceeding, plaintiff	The labor union representing the workers of Sistemas e Instalaciones de Telecomunicacion S.A. (“Sintel”)	The labor union representing the workers of Sistemas e Instalaciones de Telecomunicacion S.A. (“Sintel”)
Damages sought	€ 300	$ 396.0
Pending or threatened litigation, estimated loss		$ 9.6
Pending Litigation [Member] \| City Of Marathon [Member]
Commitment And Contingencies [Line Items]
Legal proceeding, plaintiff	the Company	the Company
Guarantee Obligations [Member] \| Letter of Credit [Member]
Commitment And Contingencies [Line Items]
Letters of credit, outstanding amount		$ 120.8	$ 90.0
Performance Guarantee [Member]
Commitment And Contingencies [Line Items]
Outstanding bonds, amount		1,065.2	905.7
Performance Guarantee [Member] \| Scenario, Forecast [Member]
Commitment And Contingencies [Line Items]
Estimated cost to complete bonded projects					$ 284.5	$ 330.0
Insurance Claims [Member]
Commitment And Contingencies [Line Items]
Cash collateral held by insurance carriers		2.0	2.0
Insurance Claims [Member] \| Workers Compensation, General And Automobile Policies [Member]
Commitment And Contingencies [Line Items]
Self insurance reserve		48.1	39.1
Self insurance reserve, noncurrent		28.5	22.3
Insurance Claims [Member] \| Employee Group Health Claims Policy [Member]
Commitment And Contingencies [Line Items]
Self insurance reserve		1.1	1.4
Insurance Claims [Member] \| Employee Group Health Claims Policy [Member] \| Per Employee [Member]
Commitment And Contingencies [Line Items]
Maximum annual loss		0.4
Insurance Claims [Member] \| Standby Letters of Credit [Member]
Commitment And Contingencies [Line Items]
Letters of credit, outstanding amount		53.2	51.4
Insurance Claims [Member] \| Surety Bond [Member]
Commitment And Contingencies [Line Items]
Outstanding bonds, amount		$ 9.0	7.1
Multiemployer Plans, Pension [Member]
Commitment And Contingencies [Line Items]
Underfunded multi-employer pension plans, funding requirements and penalties, description	The Pension Protection Act requires that underfunded pension plans improve their funding ratios within prescribed intervals based on the level of their underfunding. In addition, if a multi-employer defined benefit plan fails to satisfy certain minimum funding requirements, the Internal Revenue Service may impose on the employers contributing to such plan a nondeductible excise tax of 5% on the amount of the accumulated funding deficiency.	The Pension Protection Act requires that underfunded pension plans improve their funding ratios within prescribed intervals based on the level of their underfunding. In addition, if a multi-employer defined benefit plan fails to satisfy certain minimum funding requirements, the Internal Revenue Service may impose on the employers contributing to such plan a nondeductible excise tax of 5% on the amount of the accumulated funding deficiency.
Central States Southeast And Southwest Areas Pension Fund [Member] \| Multiemployer Plans, Pension [Member]
Commitment And Contingencies [Line Items]
Multiemployer plans, withdrawal liability		$ 6.4
Multi-employer pension plan withdrawal obligation, description	On November 15, 2011, the Company, along with other members of the Pipe Line Contractors Association (“PLCA”), voluntarily withdrew from the Central States Southeast and Southwest Areas Pension Fund (“Central States”), a defined benefit multi-employer pension plan. In connection with this withdrawal, the Company recorded a $6.4 million withdrawal liability based on an estimate provided by the plan administrator of such liability as of the date of withdrawal. The Company withdrew from the Central States Plan in order to mitigate its liability in connection with the plan, which is in critical status; however, the plan has asserted that the PLCA members did not effectively withdraw on November 15, 2011. Although the Company believes that it legally and effectively withdrew from the plan on November 15, 2011, if the plan were to prevail in its assertion that the Company in fact withdrew after that date, then the amount of the Company’s withdrawal liability would increase. In addition, if this plan were to undergo a mass withdrawal, as defined by ERISA and the Pension Benefit Guaranty Corporation, within the three year period commencing with the beginning of the calendar year during which the Company withdrew from the plan, there could be additional liability. The Company currently does not have plans to withdraw from any other multi-employer pension plan.	On November 15, 2011, the Company, along with other members of the Pipe Line Contractors Association (“PLCA”), voluntarily withdrew from the Central States Southeast and Southwest Areas Pension Fund (“Central States”), a defined benefit multi-employer pension plan. In connection with this withdrawal, the Company recorded a $6.4 million withdrawal liability based on an estimate provided by the plan administrator of such liability as of the date of withdrawal. The Company withdrew from the Central States Plan in order to mitigate its liability in connection with the plan, which is in critical status; however, the plan has asserted that the PLCA members did not effectively withdraw on November 15, 2011. Although the Company believes that it legally and effectively withdrew from the plan on November 15, 2011, if the plan were to prevail in its assertion that the Company in fact withdrew after that date, then the amount of the Company’s withdrawal liability would increase. In addition, if this plan were to undergo a mass withdrawal, as defined by ERISA and the Pension Benefit Guaranty Corporation, within the three year period commencing with the beginning of the calendar year during which the Company withdrew from the plan, there could be additional liability. The Company currently does not have plans to withdraw from any other multi-employer pension plan.
Minimum [Member] \| Aon Risk Services Inc [Member] \| Positive Outcome of Litigation [Member]
Commitment And Contingencies [Line Items]
Claims sought								$ 5.0
Minimum [Member] \| Pending Litigation [Member] \| City Of Marathon [Member]
Commitment And Contingencies [Line Items]
Damages sought		$ 6.0
Segment, Continuing Operations [Member]
Commitment And Contingencies [Line Items]
Operating leases, rent expense		$ 222.5	$ 168.8	$ 129.3

Concentrations of Risk Concentrations Of Risk (Narrative) (Details)	12 Months Ended
	Dec. 31, 2012 customer
Risks and Uncertainties [Abstract]
Number Of Customers	400

Concentrations Of Risk (Schedule Of Major Customers, By Revenue Concentration) (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment, Continuing Operations [Member] \| Customer Concentration Risk [Member] \| Ten Largest Customers [Member]
Concentration Risk [Line Items]
Revenues as a percent of total	64.00%	71.00%	72.00%

Related Party Transactions (Detail) - USD ($)	9 Months Ended	12 Months Ended
Related Party Transactions (Detail) - USD ($)	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Payments for life insurance policies		$ 284,000	$ 284,000	$ 478,000
Management [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party		2,000	66,000	560,000
Immediate Family Member of Management or Principal Owner [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 859,000	44,000	48,000	48,000
Related Customer [Member] \| Management [Member]
Related Party Transaction [Line Items]
Charges to related party		527,000	480,000	463,000
Related party receivables		907,000	860,000
Related party revenues		1,214,000	1,123,000	979,000
Accounts receivable, related party		1,232,000	775,000
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] \| Management [Member]
Related Party Transaction [Line Items]
Estimated fair value of life insurance policies		8,700,000	7,900,000
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] \| Board of Directors Chairman [Member]
Related Party Transaction [Line Items]
Life insurance, split dollar policies, face amount		200,000,000
Payments for life insurance policies		284,000	284,000	284,000
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] \| Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Life insurance, split dollar policies, face amount		11,000,000
Payments for life insurance policies		$ 0	$ 0	$ 115,000

Quarterly Information (Unaudited) Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Revenue

$ 932,300

$ 1,067,300

$ 988,900

$ 738,300

$ 731,600

$ 816,200

$ 709,900

$ 573,600

$ 3,726,789

$ 2,831,292

$ 2,143,024

Income from continuing operations before non-controlling interests

37,600

36,100

31,200

11,700

7,000

30,800

43,400

16,300

116,639

97,456

66,130

Income (loss) from discontinued operations

(1,300)

(9,300)

(1,100)

2,500

1,600

1,000

1,100

4,800

(9,223)

8,516

24,257

Net income attributable to MasTec, Inc.

$ 36,300

$ 26,800

$ 30,100

$ 14,200

$ 8,600

$ 31,800

$ 44,500

$ 21,100

$ 107,426

$ 106,001

$ 90,528

Basic earnings (loss) per share:

Continuing operations

$ 0.50

^[1]

$ 0.47

^[1]

$ 0.39

^[1]

$ 0.15

^[1]

$ 0.08

^[1]

$ 0.36

^[1]

$ 0.52

^[1]

$ 0.21

^[1]

$ 1.49

$ 1.19

$ 0.87

Discontinued operations

(0.02)

^[1]

(0.12)

^[1]

(0.01)

^[1]

0.03

^[1]

0.02

^[1]

0.01

^[1]

0.01

^[1]

0.06

^[1]

(0.12)

0.10

0.32

Total basic earnings per share

0.48

^[1]

0.35

^[1]

0.37

^[1]

0.18

^[1]

0.10

^[1]

0.37

^[1]

0.53

^[1]

0.27

^[1]

1.37

^[2]

1.29

^[2]

1.19

^[2]

Diluted earnings (loss) per share:

Continuing operations

0.46

^[1]

0.45

^[1]

0.38

^[1]

0.14

^[1]

0.08

^[1]

0.35

^[1]

0.50

^[1]

0.20

^[1]

1.42

1.13

0.78

Discontinued operations

(0.02)

^[1]

(0.12)

^[1]

(0.01)

^[1]

0.03

^[1]

0.02

^[1]

0.01

^[1]

0.01

^[1]

0.06

^[1]

(0.11)

0.10

0.27

Total diluted earnings per share

$ 0.45

^[1]

$ 0.34

^[1]

$ 0.37

^[1]

$ 0.17

^[1]

$ 0.10

^[1]

$ 0.36

^[1]

$ 0.51

^[1]

$ 0.26

^[1]

$ 1.31

^[2]

$ 1.23

^[2]

$ 1.05

^[2]

[1]	Note that due to rounding differences, the sum of the Company’s quarterly earnings per share in a given year may not be the same as the Company’s year to date earnings per share for the same period. In addition, earnings per share calculations may contain slight summation differences due to rounding. See Note 2 – Earnings per Share.
[2]	Earnings per share tables may contain slight summation differences due to rounding

Quarterly Information (Unaudited) Quarterly Financial Information (Unaudited) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Impairment of assets, disposal group		$ 12,922	$ 0	$ 0
Gain on remeasurement of equity interest in acquiree		0	29,041	0
Multiemployer plans, withdrawal liability		6,400
Globetec [Member]
Impairment of assets, disposal group		12,700	$ 0	$ 0
Ec Source [Member]
Gain on remeasurement of equity interest in acquiree	$ 29,000
Pending Litigation [Member] \| Sintel [Member]
Pending or threatened litigation, estimated loss		9,600
Multiemployer Plans, Pension [Member] \| Central States Southeast And Southwest Areas Pension Fund [Member]
Multiemployer plans, withdrawal liability		$ 6,400

Supplemental Guarantor Financial Information (Condensed Consolidating Balance Sheets) (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Assets
Current assets	$ 1,047,068	$ 828,804
Current assets of discontinued operations	18,591	30,608	$ 43,100
Property and equipment, net	350,355	263,007
Goodwill and other intangible assets, net	957,441	825,467	596,500
Net investments in and advances to (from) consolidated affiliates	0	0
Other assets	45,422	55,732
Long-term assets of discontinued operations	7,648	121,695	104,000
Total assets	2,407,934	2,094,705	1,655,800
Liabilities and Shareholders' Equity
Current liabilities	705,702	592,445
Current liabilities of discontinued operations	4,569	29,274
Long-term debt	546,323	460,690
Other liabilities	293,974	230,363
Total liabilities	1,545,999	1,283,498
Total shareholders' equity	861,935	811,207	653,162	$ 528,162
Total liabilities and shareholders' equity	2,407,934	2,094,705
Parent Company [Member]
Assets
Current assets of discontinued operations	0	0
Property and equipment, net	0	0
Goodwill and other intangible assets, net	0	0
Net investments in and advances to (from) consolidated affiliates	854,993	811,982
Other assets	7,702	7,119
Long-term assets of discontinued operations	0	0
Total assets	862,695	819,101
Liabilities and Shareholders' Equity
Current liabilities of discontinued operations	0	0
Long-term debt	0	0
Other liabilities	0	0
Total liabilities	22	0
Total shareholders' equity	862,673	819,101
Total liabilities and shareholders' equity	862,695	819,101
Guarantor Subsidiaries [Member]
Assets
Current assets of discontinued operations	13,836	22,572
Property and equipment, net	338,974	251,948
Goodwill and other intangible assets, net	926,712	793,832
Net investments in and advances to (from) consolidated affiliates	172,534	117,963
Other assets	37,640	47,580
Long-term assets of discontinued operations	4,711	114,378
Total assets	2,474,511	2,093,141
Liabilities and Shareholders' Equity
Current liabilities of discontinued operations	574	20,912
Long-term debt	546,262	460,603
Other liabilities	273,198	209,225
Total liabilities	1,498,335	1,224,646
Total shareholders' equity	976,176	868,495
Total liabilities and shareholders' equity	2,474,511	2,093,141
Non-Guarantor Subsidiaries [Member]
Assets
Current assets of discontinued operations	4,755	8,036
Property and equipment, net	11,381	11,059
Goodwill and other intangible assets, net	30,729	31,635
Net investments in and advances to (from) consolidated affiliates	(21,779)	(41,830)
Other assets	80	1,033
Long-term assets of discontinued operations	2,937	7,317
Total assets	76,476	70,578
Liabilities and Shareholders' Equity
Current liabilities of discontinued operations	3,995	8,362
Long-term debt	61	87
Other liabilities	20,776	21,138
Total liabilities	47,642	58,852
Total shareholders' equity	28,834	11,726
Total liabilities and shareholders' equity	76,476	70,578
Consolidation, Eliminations [Member]
Assets
Current assets of discontinued operations	0	0
Property and equipment, net	0	0
Goodwill and other intangible assets, net	0	0
Net investments in and advances to (from) consolidated affiliates	(1,005,748)	(888,115)
Other assets	0	0
Long-term assets of discontinued operations	0	0
Total assets	(1,005,748)	(888,115)
Liabilities and Shareholders' Equity
Current liabilities of discontinued operations	0	0
Long-term debt	0	0
Other liabilities	0	0
Total liabilities	0	0
Total shareholders' equity	(1,005,748)	(888,115)
Total liabilities and shareholders' equity	(1,005,748)	(888,115)
Segment, Continuing Operations [Member]
Assets
Current assets	1,028,477	798,196
Total assets	2,381,700	1,942,400	$ 1,508,700
Liabilities and Shareholders' Equity
Current liabilities	701,133	563,171
Segment, Continuing Operations [Member] \| Parent Company [Member]
Assets
Current assets	0	0
Liabilities and Shareholders' Equity
Current liabilities	22	0
Segment, Continuing Operations [Member] \| Guarantor Subsidiaries [Member]
Assets
Current assets	980,104	744,868
Liabilities and Shareholders' Equity
Current liabilities	678,301	533,906
Segment, Continuing Operations [Member] \| Non-Guarantor Subsidiaries [Member]
Assets
Current assets	48,373	53,328
Liabilities and Shareholders' Equity
Current liabilities	22,810	29,265
Segment, Continuing Operations [Member] \| Consolidation, Eliminations [Member]
Assets
Current assets	0	0
Liabilities and Shareholders' Equity
Current liabilities	$ 0	$ 0

Supplemental Guarantor Financial Information (Condensed Consolidating Statements Of Operations And Comprehensive Income) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Revenue	$ 932,300	$ 1,067,300	$ 988,900	$ 738,300	$ 731,600	$ 816,200	$ 709,900	$ 573,600	$ 3,726,789	$ 2,831,292	$ 2,143,024
Costs of revenue, excluding depreciation and amortization									3,239,195	2,459,746	1,829,498
Depreciation and amortization									92,601	75,228	57,966
General and administrative expenses									157,524	132,594	112,180
Interest expense, net									37,376	34,466
Gain on remeasurement of equity interest in acquiree									0	(29,041)	0
Other expense (income), net									8,017	96	1,219
Income from continuing operations before provision for income taxes									192,719	159,280	114,072
Benefit (provision) for income taxes									(76,080)	(61,824)	(47,942)
Income from continuing operations before non-controlling interests	37,600	36,100	31,200	11,700	7,000	30,800	43,400	16,300	116,639	97,456	66,130
Income (loss) from discontinued operations, net of tax	(1,300)	(9,300)	(1,100)	2,500	1,600	1,000	1,100	4,800	(9,223)	8,516	24,257
Equity in income from subsidiaries, net of tax									0	0
Net income									107,416	105,972	90,387
Net loss attributable to non-controlling interests									(10)	(29)	(141)
Net income attributable to MasTec, Inc.	$ 36,300	$ 26,800	$ 30,100	$ 14,200	$ 8,600	$ 31,800	$ 44,500	$ 21,100	107,426	106,001	90,528
Comprehensive income (loss)									109,861	104,182	90,355
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue									0	0
Costs of revenue, excluding depreciation and amortization									0	0
General and administrative expenses									1,665	2,530
Interest expense, net									0	0
Gain on remeasurement of equity interest in acquiree										0
Other expense (income), net									0	0
Income from continuing operations before provision for income taxes									(1,667)	(2,530)
Benefit (provision) for income taxes									675	989
Income from continuing operations before non-controlling interests									(992)	(1,541)
Income (loss) from discontinued operations, net of tax									0	0
Equity in income from subsidiaries, net of tax									108,408	107,513
Net income									107,416	105,972
Net loss attributable to non-controlling interests									0	0
Net income attributable to MasTec, Inc.									107,416	105,972
Comprehensive income (loss)									107,416	105,972
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue									3,538,288	2,726,618
Costs of revenue, excluding depreciation and amortization									3,074,031	2,360,578
General and administrative expenses									145,831	125,136
Interest expense, net									37,378	34,391
Gain on remeasurement of equity interest in acquiree										(29,041)
Other expense (income), net									7,838	224
Income from continuing operations before provision for income taxes									183,584	163,425
Benefit (provision) for income taxes									(74,440)	(64,395)
Income from continuing operations before non-controlling interests									109,144	99,030
Income (loss) from discontinued operations, net of tax									(7,390)	10,007
Equity in income from subsidiaries, net of tax									0	0
Net income									101,754	109,037
Net loss attributable to non-controlling interests									0	0
Net income attributable to MasTec, Inc.									101,754	109,037
Comprehensive income (loss)									102,275	108,877
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue									188,501	104,674
Costs of revenue, excluding depreciation and amortization									165,164	99,168
General and administrative expenses									10,028	4,928
Interest expense, net									(2)	75
Gain on remeasurement of equity interest in acquiree										0
Other expense (income), net									179	(128)
Income from continuing operations before provision for income taxes									10,802	(1,615)
Benefit (provision) for income taxes									(2,315)	1,582
Income from continuing operations before non-controlling interests									8,487	(33)
Income (loss) from discontinued operations, net of tax									(1,833)	(1,491)
Equity in income from subsidiaries, net of tax									0	0
Net income									6,654	(1,524)
Net loss attributable to non-controlling interests									(10)	(29)
Net income attributable to MasTec, Inc.									6,664	(1,495)
Comprehensive income (loss)									8,578	(3,154)
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue									0	0
Costs of revenue, excluding depreciation and amortization									0	0
General and administrative expenses									0	0
Interest expense, net									0	0
Gain on remeasurement of equity interest in acquiree										0
Other expense (income), net									0	0
Income from continuing operations before provision for income taxes									0	0
Benefit (provision) for income taxes									0	0
Income from continuing operations before non-controlling interests									0	0
Income (loss) from discontinued operations, net of tax									0	0
Equity in income from subsidiaries, net of tax									(108,408)	(107,513)
Net income									(108,408)	(107,513)
Net loss attributable to non-controlling interests									0	0
Net income attributable to MasTec, Inc.									(108,408)	(107,513)
Comprehensive income (loss)									(108,408)	(107,513)
Segment, Continuing Operations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue									3,726,800	2,831,300	2,143,000
Depreciation and amortization									91,958	74,151	$ 56,877
Segment, Continuing Operations [Member] \| Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Depreciation and amortization									2	0
Segment, Continuing Operations [Member] \| Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Depreciation and amortization									89,626	71,905
Segment, Continuing Operations [Member] \| Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Depreciation and amortization									2,330	2,246
Segment, Continuing Operations [Member] \| Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Depreciation and amortization									$ 0	$ 0

Supplemental Guarantor Financial Information (Condensed Consolidating Statements Of Cash Flows) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 172,135	$ 5,826	$ 218,029
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	(153,138)	(85,395)	(75,896)
Capital expenditures	(79,686)	(71,710)	(30,383)
Proceeds from sale of assets	7,385	6,227	7,037
Proceeds from disposal of business, net	97,728	0	0
Proceeds from sale or redemption of investments	0	4,600	7,044
Investments in life insurance policies	(284)	(284)	(478)
Net cash provided by (used in) investing activities	(127,995)	(146,562)	(104,280)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	959,183	370,411	0
Repayments of credit facility	(885,183)	(310,411)	0
Repayments of other borrowings	(21,455)	(13,956)	(27,170)
Proceeds from book overdrafts	116	14,906	0
Payments of capital lease obligations	(21,060)	(16,458)	(14,460)
Proceeds from stock options exercises and other share-based awards	5,013	12,542	3,515
Excess tax benefit from stock-based compensation	759	7,766	0
Purchases of treasury stock	(75,000)	(75,000)	0
Payments of financing costs	(117)	(6,589)	(169)
Net financing activities and advances (to) from consolidated affiliates	0	0
Net cash (used in) provided by financing activities	(37,744)	(16,789)	(24,741)
Net (decrease) increase and cash equivalents	6,396	(157,525)	89,008
Net effect of currency translation on cash	91	201	75
Cash and cash equivalents - beginning of period	20,280	177,604	88,521
Cash and cash equivalents - end of period	26,767	20,280	177,604
Cash and cash equivalents of discontinued operations	385	12,874	18,911
Cash and cash equivalents of continuing operations	26,382	7,406	158,693
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(1,254)	(939)
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	0	(31,236)
Capital expenditures	0	0
Proceeds from sale of assets	0	0
Proceeds from disposal of business, net	0
Proceeds from sale or redemption of investments		0
Investments in life insurance policies	(284)	(284)
Net cash provided by (used in) investing activities	(284)	(31,520)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	0	0
Repayments of credit facility	0	0
Repayments of other borrowings	0	0
Proceeds from book overdrafts	0	0
Payments of capital lease obligations	0	0
Proceeds from stock options exercises and other share-based awards	5,013	12,542
Excess tax benefit from stock-based compensation	0	0
Purchases of treasury stock	(75,000)	(75,000)
Payments of financing costs	0	0
Net financing activities and advances (to) from consolidated affiliates	71,525	94,917
Net cash (used in) provided by financing activities	1,538	32,459
Net (decrease) increase and cash equivalents	0	0
Net effect of currency translation on cash	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0	0
Cash and cash equivalents of discontinued operations	0	0
Cash and cash equivalents of continuing operations	0	0
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	151,866	21,729
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	(151,736)	(44,716)
Capital expenditures	(77,744)	(71,615)
Proceeds from sale of assets	7,385	5,887
Proceeds from disposal of business, net	97,728
Proceeds from sale or redemption of investments		4,600
Investments in life insurance policies	0	0
Net cash provided by (used in) investing activities	(124,367)	(105,844)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	959,183	370,411
Repayments of credit facility	(885,183)	(310,411)
Repayments of other borrowings	(21,455)	(13,956)
Proceeds from book overdrafts	116	14,906
Payments of capital lease obligations	(21,034)	(16,422)
Proceeds from stock options exercises and other share-based awards	0	0
Excess tax benefit from stock-based compensation	759	7,766
Purchases of treasury stock	0	0
Payments of financing costs	(117)	(6,589)
Net financing activities and advances (to) from consolidated affiliates	(58,181)	(122,573)
Net cash (used in) provided by financing activities	(25,912)	(76,868)
Net (decrease) increase and cash equivalents	1,587	(160,983)
Net effect of currency translation on cash	0	0
Cash and cash equivalents - beginning of period	16,240	177,223
Cash and cash equivalents - end of period	17,827	16,240	177,223
Cash and cash equivalents of discontinued operations	275	11,386
Cash and cash equivalents of continuing operations	17,552	4,854
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	21,523	(14,964)
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	(1,402)	(9,443)
Capital expenditures	(1,942)	(95)
Proceeds from sale of assets	0	340
Proceeds from disposal of business, net	0
Proceeds from sale or redemption of investments		0
Investments in life insurance policies	0	0
Net cash provided by (used in) investing activities	(3,344)	(9,198)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	0	0
Repayments of credit facility	0	0
Repayments of other borrowings	0	0
Proceeds from book overdrafts	0	0
Payments of capital lease obligations	(26)	(36)
Proceeds from stock options exercises and other share-based awards	0	0
Excess tax benefit from stock-based compensation	0	0
Purchases of treasury stock	0	0
Payments of financing costs	0	0
Net financing activities and advances (to) from consolidated affiliates	(13,344)	27,656
Net cash (used in) provided by financing activities	(13,370)	27,620
Net (decrease) increase and cash equivalents	4,809	3,458
Net effect of currency translation on cash	91	201
Cash and cash equivalents - beginning of period	4,040	381
Cash and cash equivalents - end of period	8,940	4,040	381
Cash and cash equivalents of discontinued operations	110	1,488
Cash and cash equivalents of continuing operations	8,830	2,552
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	0	0
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	0	0
Capital expenditures	0	0
Proceeds from sale of assets	0	0
Proceeds from disposal of business, net	0
Proceeds from sale or redemption of investments		0
Investments in life insurance policies	0	0
Net cash provided by (used in) investing activities	0	0
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	0	0
Repayments of credit facility	0	0
Repayments of other borrowings	0	0
Proceeds from book overdrafts	0	0
Payments of capital lease obligations	0	0
Proceeds from stock options exercises and other share-based awards	0	0
Excess tax benefit from stock-based compensation	0	0
Purchases of treasury stock	0	0
Payments of financing costs	0	0
Net financing activities and advances (to) from consolidated affiliates	0	0
Net cash (used in) provided by financing activities	0	0
Net (decrease) increase and cash equivalents	0	0
Net effect of currency translation on cash	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0	$ 0
Cash and cash equivalents of discontinued operations	0	0
Cash and cash equivalents of continuing operations	$ 0	$ 0

Valuation and Qualifying Accounts (Rollforward) (Tables) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Movement in Valuation Allowances and Reserves [Roll Forward]

$ 13.6

$ 15.1

$ 18.7

9.7

6.2

3.2

(7.9)

(7.7)

(6.8)

Allowance for Doubtful Accounts, Continuing Operations [Member]

15.4

13.6

15.1

Movement in Valuation Allowances and Reserves [Roll Forward]

7.6

8.3

10.2

^[1]

6.9

2.0

2.7

^[2]

(3.3)

(2.7)

(4.6)

Inventory Valuation Reserve [Member]

11.2

7.6

8.3

Movement in Valuation Allowances and Reserves [Roll Forward]

2.2

0.4

0.1

^[3]

2.3

3.1

0.3

(2.5)

^[4]

(1.3)

^[4]

0.0

Accumulated Net Unrealized Investment Gain (Loss) [Member]

2.0

2.2

0.4

Movement in Valuation Allowances and Reserves [Roll Forward]

1.0

0.8

3.0

0.0

0.7

^[5]

0.0

(0.8)

^[6]

(0.5)

^[7]

(2.2)

^[8]

Valuation Allowance, Operating Loss Carryforwards [Member]

0.2

1.0

0.8

Movement in Valuation Allowances and Reserves [Roll Forward]

2.8

5.6

5.4

^[9]

0.5

0.4

0.2

(1.3)

^[10]

(3.2)

^[10]

0.0