View Filing Data

Costs of revenue, excluding depreciation and amortization

$ 1,309,596

$ 1,269,385

$ 3,378,180

$ 3,165,657

1,122,961

1,081,132

2,914,904

2,695,287

Depreciation and amortization

41,747

37,756

111,996

103,111

General and administrative expenses

59,889

58,976

167,454

159,761

Interest expense, net

12,643

12,666

37,595

34,549

Loss on extinguishment of debt

5,624

Other income, net

(1,416)

(2,778)

(5,424)

(3,283)

Income from continuing operations before income taxes

73,772

81,633

151,655

170,608

Provision for income taxes

(28,042)

(31,698)

(57,671)

(65,822)

Net income from continuing operations

45,730

49,935

93,984

104,786

Discontinued operations:

Net loss from discontinued operations, including loss on disposal and impairment charges (See Note 4)

(320)

(3,735)

(592)

(5,165)

Net income

45,410

46,200

93,392

99,621

Net income attributable to non-controlling interests

139

172

Net income attributable to MasTec, Inc.

$ 45,271

$ 46,138

$ 93,344

$ 99,449

Basic earnings (loss) per share:

Continuing operations

$ 0.56

$ 0.65

$ 1.19

$ 1.36

Discontinued operations

0.00

(0.05)

(0.01)

(0.07)

Total basic earnings per share

^[1]

$ 0.55

$ 0.60

$ 1.18

$ 1.29

Basic weighted average common shares outstanding

81,811

77,093

79,158

76,816

Diluted earnings (loss) per share:

Continuing operations

$ 0.53

$ 0.59

$ 1.09

$ 1.24

Discontinued operations

0.00

(0.04)

(0.01)

(0.06)

Total diluted earnings per share

^[1]

$ 0.53

$ 0.54

$ 1.08

$ 1.18

Diluted weighted average common shares outstanding

85,824

85,464

86,416

84,733

[1]	Earnings per share calculations may contain slight summation differences due to rounding.

Condensed Unaudited Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income	$ 45,410	$ 46,200	$ 93,392	$ 99,621
Other comprehensive (loss) income:
Other comprehensive (loss) income (See Note 13)	(12,944)	2,844	(10,601)	(4,397)
Comprehensive income	32,466	49,044	82,791	95,224
Comprehensive income attributable to non-controlling interests	139	62	48	172
Comprehensive income attributable to MasTec, Inc.	32,327	48,982	82,743	95,052
Foreign Currency Translation Adjustments [Member]
Other comprehensive (loss) income:
Other comprehensive (loss) income (See Note 13)	(12,944)	2,936	(10,601)	(3,839)
Available-for-Sale-Securities [Member]
Other comprehensive (loss) income:
Other comprehensive (loss) income (See Note 13)	$ 0	$ (92)	$ 0	$ (558)

Condensed Unaudited Consolidated Balance Sheets - USD ($)	Sep. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 7,067,000	$ 22,927,000
Accounts receivable, net of allowance	1,389,903,000	1,134,693,000
Inventories, net	105,038,000	70,185,000
Prepaid expenses and other current assets, including discontinued operations (See Note 4)	71,944,000	79,221,000
Total current assets	1,573,952,000	1,307,026,000
Property and equipment, net	614,359,000	488,132,000
Goodwill	1,000,024,000	902,044,000
Other intangible assets, net	222,212,000	165,606,000
Other long-term assets, including discontinued operations (See Note 4)	59,579,000	60,390,000
Total assets	3,470,126,000	2,923,198,000
Current liabilities
Current maturities of long-term debt	71,798,000	51,376,000
Accounts payable	481,840,000	424,917,000
Accrued salaries and wages	82,083,000	66,455,000
Other accrued expenses	82,054,000	71,448,000
Acquisition-related contingent consideration, current	39,126,000	67,226,000
Billings in excess of costs and earnings	130,997,000	121,641,000
Other current liabilities, including discontinued operations (See Note 4)	22,976,000	26,162,000
Total current liabilities	910,874,000	829,225,000
Acquisition-related contingent consideration, net of current portion	115,649,000	112,370,000
Long-term debt	1,088,289,000	765,425,000
Long-term deferred tax liabilities, net	180,449,000	154,763,000
Other liabilities	45,978,000	40,357,000
Total liabilities	2,341,239,000	1,902,140,000
Commitments and contingencies (See Note 16)
Equity
Preferred stock, $1.00 par value; authorized shares - 5,000,000; issued and outstanding shares - none	0	0
Common stock, $0.10 par value; authorized shares - 145,000,000; issued shares - 87,106,042 and 86,725,372 as of September 30, 2014 and December 31, 2013, respectively	8,711,000	8,672,000
Capital surplus	781,400,000	822,836,000
Contributed shares	6,002,000	6,002,000
Retained earnings	435,208,000	341,864,000
Accumulated other comprehensive loss	(23,887,000)	(13,286,000)
Treasury stock, at cost; 5,262,831 and 9,467,286 shares as of September 30, 2014 and December 31, 2013, respectively	(83,385,000)	(150,000,000)
Total MasTec, Inc. shareholders' equity	1,124,049,000	1,016,088,000
Non-controlling interests	4,838,000	4,970,000
Total equity	1,128,887,000	1,021,058,000
Total liabilities and equity	$ 3,470,126,000	$ 2,923,198,000

Condensed Unaudited Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	145,000,000	145,000,000
Common stock, shares issued	87,106,042	86,725,372
Treasury stock, shares	5,262,831	9,467,286

Condensed Unaudited Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Cash flows from operating activities:

Net income

$ 93,392

$ 99,621

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

Depreciation and amortization

111,996

103,111

Non-cash interest expense, including write-off of deferred financing costs on redeemed debt

6,052

8,397

Non-cash stock-based compensation expense

11,584

9,647

Excess tax benefit from stock-based compensation

^[1]

(3,494)

(4,446)

Provision for deferred income taxes

4,294

9,439

(Gains) losses on sales of assets, including impairment charges on discontinued operations

(4,068)

1,152

Changes in assets and liabilities, net of acquisitions:

Accounts receivable

(131,175)

(271,010)

Inventories

(27,553)

20,484

Other assets, current and non-current portion

5,202

18,610

Accounts payable and accrued expenses

14,521

126,784

Billings in excess of costs and earnings

4,171

(19,776)

Book overdrafts

(10,399)

2,791

Other liabilities, current and non-current portion

5,857

16,027

Net cash provided by operating activities

81,019

129,256

Cash flows (used in) provided by investing activities:

Cash paid for acquisitions, net of cash acquired

(162,901)

(146,598)

Capital expenditures

(90,962)

(101,411)

Proceeds from sale of property and equipment

12,204

8,288

Proceeds from disposal of business, net of cash divested

(4,332)

(Payments for) proceeds from other investments, net

(1,046)

3,852

Net cash used in investing activities

(242,705)

(240,201)

Cash flows provided by (used in) financing activities:

Proceeds from credit facility

1,319,623

766,154

Repayments of credit facility

(955,151)

(860,070)

Proceeds from issuance of senior notes

400,000

Repayment of senior notes, including convertible notes

(105,325)

(150,000)

Repayments of other borrowings

(15,827)

(24,246)

Payments of capital lease obligations

(38,358)

(32,214)

Excess tax benefit from stock-based compensation

3,494

4,446

Payments of financing costs, including call premiums on extinguishment of debt

(1,455)

(11,835)

Net cash provided by financing activities

146,978

87,144

Effect of currency translation on cash

(1,152)

(118)

Net decrease in cash and cash equivalents

(15,860)

(23,919)

Cash and cash equivalents - beginning of period

22,927

26,767

Cash and cash equivalents - end of period

7,067

2,848

Supplemental cash flow information:

Interest paid

35,106

30,851

Income taxes paid, net of refunds

46,423

49,722

Supplemental disclosure of non-cash information:

Equipment acquired under capital lease

55,488

82,737

2011 4.0% Notes [Member]

Supplemental disclosure of non-cash information:

Premium shares, conversion of convertible notes

114,785

Equipment [Member]

Supplemental disclosure of non-cash information:

Equipment acquired under financing arrangements

6,851

24,100

Earn-Out Arrangements [Member]

Cash flows provided by (used in) financing activities:

Payments of acquisition-related contingent consideration

(60,341)

(12,848)

Supplemental disclosure of non-cash information:

34,988

29,971

Stock Compensation Plan [Member]

Cash flows provided by (used in) financing activities:

Proceeds from stock-based awards, net of tax withholdings

318

7,757

Payments of acquisition-related contingent consideration

3,800

12,200

Operating Expense [Member]

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

Provision for losses on operating assets

1,136

6,300

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

$ (497)

$ 2,125

[1]

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

Business, Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]
Business, Basis of Presentation and Significant Accounting Policies	Note 1 – 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: petroleum and natural gas pipeline infrastructure; wireless, wireline/fiber and satellite communications; electrical utility transmission and distribution; power generation; and industrial infrastructure. MasTec’s customers are in these industries. MasTec reports its results in five reportable segments: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (4) Power Generation and Industrial; and (5) Other. See Note 15 - Segments and Related Information. Basis of Presentation The accompanying condensed unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions for Form 10-Q and Rule 10-01 of Regulation S-X. Pursuant to these rules and regulations, certain information and footnote disclosures normally included in the annual consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The accompanying condensed consolidated balance sheet as of December 31, 2013 is derived from the Company’s audited financial statements as of that date. Because certain information and footnote disclosures have been condensed or omitted, these condensed unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto as of and for the year ended December 31, 2013 contained in the Company’s most recent Annual Report on Form 10-K. In management’s opinion, all normal and recurring adjustments considered necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented have been included. Certain prior year amounts have been reclassified to conform to the current period presentation. Interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full fiscal year. The Company believes that the disclosures made in these condensed unaudited consolidated financial statements are adequate to make the information not misleading. Principles of Consolidation The accompanying condensed unaudited 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 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 condensed unaudited consolidated balance sheets. Income or loss from these investments is recorded in other income or expense, net, in the condensed unaudited consolidated statements of operations. The Company's investments in entities in which the Company does not have the ability to exert significant influence are accounted for using the cost method of accounting. All significant intercompany balances and transactions have been eliminated in consolidation. 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 or loss. Revenue and expenses are translated into U.S. dollars at average rates of exchange prevailing during the applicable 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. The results of operations and financial position of any discontinued operations are aggregated and presented separately from the Company's continuing operations in the condensed unaudited consolidated financial statements for all periods presented. Investments in Affiliates and Other Entities In the ordinary course of business, the Company enters into various investment arrangements, which may include equity or other interests in business entities, including contractual joint ventures or other forms of equity participation. These investment arrangements may also include certain forms of financing, such as the extension of loans. In connection with certain of these investment arrangements, the Company provides infrastructure construction services to or through its equity investees and/or contractual joint ventures. Management determines whether such investment arrangements involve a variable interest entity (“VIE”) based on the characteristics of the particular entity. If an entity is determined to be a VIE, then management determines if the Company is the primary beneficiary of the entity and whether or not consolidation of the VIE within the Company's financial statements is required. The primary beneficiary consolidating the VIE must normally have both (i) the power to direct the activities of a VIE that most significantly affect the VIE’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE, which, in either case, could be significant to the VIE. If management determines that the Company is the primary beneficiary of a VIE, then the VIE would be consolidated, and the other party’s equity interest in the VIE would be accounted for as a non-controlling interest. As of September 30, 2014, the Company was not the primary beneficiary of any VIE. In cases where the Company has an undivided interest in the assets, liabilities, revenues and profits of an unincorporated entity, such amounts are consolidated on a basis proportional to the Company’s ownership interest in the unincorporated entity. 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 and gross profit or loss, in particular, on long-term construction contracts, which rely upon estimates of costs to complete projects, ultimate project gross profit and the amount of contract price adjustments that are probable; allowances for doubtful accounts; accrued self-insured claims; estimated fair values of goodwill and intangible assets, acquisition-related contingent consideration, convertible debt obligations and investments in cost and equity method investees; asset lives used in computing depreciation and amortization, including amortization of intangible assets; share-based compensation; 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 condensed unaudited consolidated financial statements. Significant Accounting Policies 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. Revenue and related costs for master and other service agreements billed on a time and materials basis are recognized as the services are rendered. The Company also performs services under master and other service agreements on a fixed fee basis, under which MasTec furnishes specified units of service for a fixed price per unit of service and revenue is recognized as the services are rendered. Revenues from fixed price contracts provide for a fixed amount of revenue for the entire project, subject to certain additions for changed scope or specifications. Revenues from these contracts are recognized using the percentage-of-completion method. Under this method, the percentage of revenue to be recognized for a given project is measured by the percentage of costs incurred to date on the contract to the total estimated costs for the contract. Such contracts provide that the customer accept completion of progress to date and compensate the Company for services rendered, which may be measured in terms of costs incurred, units installed, hours expended or some other measure of progress. 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. As of September 30, 2014 and December 31, 2013, the Company had approximately $78 million and $79 million, respectively, of change orders and/or claims that had been included as contract price adjustments on certain contracts that were in the process of being resolved in the normal course of business, including through negotiation, in arbitration and other proceedings. These contract price adjustments represent management's best estimate of additional contract revenues that have been or will be earned and that management believes are probable of collection. The amounts ultimately realized upon final acceptance by its customers could be higher or lower than such estimated amounts, which are primarily expected to be billed and collected within one year. Except for adoption of the accounting pronouncement discussed below, there have been no material changes to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013. New Accounting Pronouncements Accounting Standards Not Yet Adopted In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606). The core principle of this ASU is that a company will recognize revenue when it transfers goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under current guidance and will be required to disclose information about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including disclosure of assumptions and estimates where significant judgment has been applied. ASU 2014-09 is effective using either the retrospective or cumulative effect transition method for fiscal years, and interim periods within those years, beginning after December 15, 2016. Early application is not permitted. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements. In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity (“ASU 2014-08”). ASU 2014-08 changes the requirements for reporting discontinued operations and requires additional disclosures about discontinued operations. Only disposals of components of an entity representing a strategic shift that has, or will have, a major effect on an entity’s operations and financial results should be reported as discontinued operations under ASU 2014-08. Examples include a disposal of a major geographical area, a major line of business, or a major equity method investment. ASU 2014-08 also requires expanded disclosures about discontinued operations and requires disclosures about individually significant dispositions that do not qualify as discontinued operations. ASU 2014-08 is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2014. Early adoption is permitted only for disposals that have not been previously reported. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements. Recently Adopted Accounting Pronouncements In July 2013, the FASB issued ASU 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the FASB Emerging Issues Task Force) (“ASU 2013-11”). ASU 2013-11 provides guidance on the presentation in the financial statements of an unrecognized tax benefit, or a portion of an unrecognized tax benefit, and explains that unrecognized tax benefits should be presented as a reduction to deferred tax assets for net operating loss carryforwards, similar tax losses or tax credit carryforwards. To the extent a net operating loss carryforward, similar tax loss or tax credit carryforward is not available as of the reporting date under the tax law of the applicable jurisdiction, or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. ASU 2013-11 applies to all entities that have unrecognized tax benefits when a net operating loss carryforward, similar tax loss, or tax credit carryforward exists as of the reporting date. ASU 2013-11 is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. Retrospective application is permitted. The Company adopted ASU 2013-11 as of January 1, 2014. The adoption of this ASU did not have a material impact on the condensed unaudited consolidated financial statements.

Earnings Per Share

9 Months Ended

Sep. 30, 2014

Earnings Per Share [Abstract]

Earnings Per Share

Note 2 – 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. The potential issuance of common shares upon the exercise, conversion or vesting of 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, may be dilutive.

The following table provides details underlying the Company’s earnings per share calculations for the periods indicated (in thousands):



	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2014			2013			2014			2013
Net income attributable to MasTec:
Net income, continuing operations - basic ^(a)	$	45,591		$	49,960		$	93,936		$	104,702
Interest expense, net of tax, 2009 Convertible Notes	20			79			166			236
Net income, continuing operations - diluted	$	45,611		$	50,039		$	94,102		$	104,938
Net loss from discontinued operations - basic and diluted ^(a)	(320		)	(3,822		)	(592		)	(5,253		)
Net income attributable to MasTec - diluted	$	45,291		$	46,217		$	93,510		$	99,685
Weighted average shares outstanding:
Weighted average shares outstanding - basic	81,811			77,093			79,158			76,816
Dilutive common stock equivalents	814			775			798			774
Dilutive premium shares, 2011 Convertible Notes	3,005			6,790			5,900			6,337
Dilutive shares, 2009 Convertible Notes	194			806			560			806
Weighted average shares outstanding - diluted	85,824			85,464			86,416			84,733


(a)	Calculated as total net income (loss) less amounts attributable to non-controlling interests.

Outstanding Convertibles Notes - Diluted Share Impact

As of September 30, 2014, the Company had $100 million aggregate principal amount of 4.25% senior convertible notes outstanding (the "4.25% Convertible Notes"), composed of $97.0 million of 4.25% Convertible Notes issued in 2011 (the “2011 4.25% Notes”) and approximately $3.0 million of 4.25% Convertible Notes issued in 2009 (the “2009 4.25% Notes”). In June 2014, $115 million aggregate principal amount of 4.0% senior convertible notes (the "4.0% Convertible Notes") matured, at which time the holders elected to convert the notes and the Company paid $105.3 million in cash and issued 4.2 million shares of common stock in respect of such notes. The 4.0% Convertible Notes were composed of $105.3 million of 4.0% Convertible Notes issued in 2011 (the "2011 4.0% Notes") and approximately $9.6 million of 4.0% Convertible Notes issued in 2009 (the "2009 4.0% Notes"). The 2009 4.0% Notes and the 2009 4.25% Notes are collectively referred to as the "2009 Convertible Notes," and the 2011 4.0% Notes and the 2011 4.25% Notes are collectively referred to as the "2011 Convertible Notes." See Note 9 - Debt for additional information.

Dilutive shares associated with the 2009 Convertible Notes are attributable to the underlying principal amounts. The number of common shares issuable upon conversion of the Company’s 2009 Convertible 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 its 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 for the period associated with the 2009 Convertible Notes, and correspondingly, the 2009 Convertible Notes are assumed to have been converted, with the resulting common shares added to the number of weighted average shares outstanding. The 2011 Convertible Notes have an optional cash settlement feature under which, in June 2014, the Company settled the principal amount of the 2011 4.0% Notes in cash, and the Company intends to settle the principal amount of the 2011 4.25% Notes in cash in December 2014. Given the Company's intention, dilutive shares associated with the 2011 Convertible Notes are derived from the premium value of the notes in excess of their principal amount, calculated using the treasury stock method. The Company refers to these shares as the "premium shares."

The 2011 4.0% Notes, which were settled in June 2014, were convertible at $15.76 per share, and the 2011 4.25% Notes, which mature in December 2014, are convertible at $15.48 per share. The calculations 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 Three Months Ended September 30,							As of and for the Nine Months Ended September 30,
	2014			2013				2014			2013
Premium Share Information:		2011 4.25% Notes		2011 4.0% Notes		2011 4.25% Notes			2011 4.25% Notes		2011 4.0% Notes		2011 4.25% Notes
Number of conversion shares, principal amount		6,268		6,683		6,268			6,268		6,683		6,268
Per share price, actual average		$	29.73	$	32.84	$	32.84		$	35.06	$	30.59	$	30.59
Premium value		$	89,341	$	114,176	$	108,864		$	122,748	$	99,104	$	94,728
Premium shares		3,005		3,476		3,314			3,501		3,240		3,097

In addition to the premium shares described above, there were 2.4 million equivalent premium shares included in the Company's dilutive share calculation for the nine month period ended September 30, 2014 related to the 2011 4.0% Notes, as calculated based on the average price per share of the Company's common stock from the beginning of the period through June 15, 2014, the date of maturity.

Diluted Shares, Other Information

A total of 304,486 and 223,422 weighted average anti-dilutive common stock equivalents were not included in the Company's diluted earnings per share calculations for the three and nine month periods ended September 30, 2014, respectively. For the three and nine month periods ended September 30, 2013, there were no anti-dilutive common stock equivalents.

Acquisitions

9 Months Ended

Sep. 30, 2014

Business Combinations [Abstract]

Acquisitions

Note 3 – Acquisitions

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. The Company acquired several businesses during 2013 and 2014, as discussed below and in Note 3 - Acquisitions in the notes to the Company's consolidated financial statements included in its Annual Report on Form 10-K for the year ended December 31, 2013. As of September 30, 2014, the allocations of purchase price to the fair values of tangible and intangible assets and liabilities, including the estimated values of contingent earn-out obligations and the estimated useful lives of acquired assets for the Company's 2014 acquisitions are provisional and remain preliminary. Management continues to assess the valuation of these items and any ultimate purchase price adjustments that may result based on the final net assets and net working capital of the acquired businesses, as prescribed in the corresponding purchase agreements.

The Company will revise its preliminary allocations for acquired businesses if new information is obtained about the facts and circumstances existing as of the date of acquisition, or for purchase price adjustments, based on the final net assets and net working capital of the acquired businesses, as prescribed in the applicable purchase agreement. Such adjustments result in the recognition of, or adjust the fair values of, acquired assets and assumed liabilities, and are presented as if the adjustments had been taken into account as of the date of acquisition, which results in the revision of comparative prior period financial information. All changes that do not qualify as measurement period adjustments are included in current period results. See table below for measurement period adjustments relating to balances as previously disclosed.

2014 Acquisitions

Pacer

Effective June 1, 2014, MasTec acquired all of the issued and outstanding equity interests of Pacer Construction Holdings Corporation and its affiliated operating companies (collectively, "Pacer"). Pacer is a western Canadian civil construction services company, headquartered in Calgary, Alberta, Canada. Pacer’s services include infrastructure construction primarily in support of oil and gas production, processing, mining and transportation. Pacer, a leading contractor in the Canadian oil sands, is expected to significantly enhance MasTec's ability to lead the development of energy infrastructure work in western Canada and take advantage of the associated rapidly expanding opportunities anticipated for energy infrastructure work in North America in the coming years. Pacer is reported within the Company's Oil and Gas segment.

The following table summarizes the preliminary estimated fair values of consideration paid and identifiable assets acquired and liabilities assumed, as adjusted, as of the date of acquisition (in millions):



Acquisition consideration:	June 1, 2014
Cash	$	126.5
Fair value of contingent consideration (earn-out liability)	25.7
Total consideration transferred	$	152.2
Identifiable assets acquired and liabilities assumed:
Current assets	$	118.4
Equity method investments	2.3
Other long-term assets	0.1
Property and equipment	72.8
Pre-qualifications	41.2
Finite-lived intangible assets	20.3
Current liabilities	(55.8		)
Long-term debt	(87.0		)
Deferred income taxes	(29.6		)
Total identifiable net assets	$	82.7
Goodwill	$	69.5
Total net assets acquired, including goodwill	$	152.2

As a result of the ongoing review of the acquired net working capital and acquired net assets of Pacer, in the third quarter of 2014, the Company recorded a $9.8 million reduction of certain long-term assets, a $7.8 million increase in pre-acquisition liabilities, a $2.7 million increase in intangible assets and a $1.4 million increase to the contingent earn-out liability. These adjustments resulted in a $16.6 million increase to the previously recorded amount of goodwill associated with the Pacer acquisition.

The fair values and weighted average useful lives of Pacer's acquired finite-lived intangible assets, as adjusted, as of the date of acquisition were assigned as follows:



	Fair Value		Weighted Average Useful Life
Finite-lived intangible assets:	(in millions)		(in years)
Backlog	$	6.1	2
Non-compete agreements	2.3		8
Customer relationships	11.9		8
Total acquired finite-lived intangible assets	$	20.3	6

Finite-lived 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 Pacer's pre-qualifications with selected customer companies has been assigned an indefinite life as the pre-qualifications are not expected to expire or diminish in value, and the companies to which they relate have extremely long operating histories. Goodwill arising from the acquisition represents the estimated value of Pacer'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 Pacer and MasTec. The goodwill balance is not tax deductible.

The values of certain of the assets acquired and liabilities assumed include the proportionate values of Pacer’s undivided interest in an unincorporated contractual joint venture, which provides civil construction services and is accounted for on a proportional basis. The equity method investments identified in the table above represent investments in entities that provide heavy civil construction services. For the three and nine month periods ended September 30, 2014, revenue recognized by the Company for infrastructure construction services on behalf of these business entities totaled $2.0 million and $3.0 million, respectively. As of September 30, 2014, receivables from infrastructure construction services provided by Pacer, including acquired receivables, totaled $2.5 million. Other amounts due Pacer from its equity method investees and contractual joint venture as of September 30, 2014 included aggregate financing receivables of $14.8 million, which is included in other current assets. In connection with these business entities, there are performance guarantees, for which Pacer is obligated on a joint and several basis with its other joint venture partners or other shareholders in such entities, of a gross amount of approximately $219.0 million ($92.0 million based on ownership percentage) on the full contract value of certain projects. These projects are in varying stages of completion as of September 30, 2014. There are also approximately $31.0 million of other financial guarantees associated with these entities for which Pacer is obligated on a joint and several basis. The Company believes these receivables and guarantees represent variable interests; however, Pacer does not have the power to control the primary activities of, nor is it the primary beneficiary of, these business entities. The Company may provide financial support to these business entities in the future.

The contingent consideration included in the table above is equal to 25% of the excess, if any, of Pacer’s earnings from continuing operations before interest, taxes, depreciation and amortization (“EBITDA”) above certain thresholds for a five-year period, as set forth in the purchase agreement, and is payable annually in Canadian dollars. The fair value of the earn-out liability 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 is estimated to be between $0 and $69 million U.S. dollars; however, there is no maximum earn-out payment amount.

Other 2014 Acquisitions

Effective April 1, 2014, MasTec acquired 100% of a telecommunications services firm that specializes in the installation of in-home security systems for an aggregate purchase price composed of approximately $17.2 million in cash and a five year earn-out, valued at $0.6 million as of the date of acquisition. Additionally, effective January 1, 2014, MasTec acquired 100% of a telecommunications services firm that specializes in the engineering, installation, furnishing and integration of telecommunications equipment for an aggregate purchase price composed of approximately $23.8 million in cash and a five year earn-out, valued at $8.7 million as of the date of acquisition. These companies are included in MasTec's Communications segment.

2013 Acquisitions

Effective May 1, 2013, MasTec acquired all of the issued and outstanding interests of Big Country Energy Services, Inc. and its affiliated operating companies (collectively, "Big Country"). Big Country, which is included in the Company's Oil and Gas segment, is a North American oil and gas pipeline and facility construction services company, headquartered in Calgary, Alberta, Canada. In addition, effective April 1, 2013, MasTec acquired a former subcontractor to its wireless business, which provides self-perform communications tower construction, installation, maintenance and other services in support of telecommunications infrastructure construction in the Company's Communications segment. MasTec also acquired, effective August 1, 2013, an electrical transmission services company that provides substation construction activities. This company is included within the Company's Electrical Transmission segment.

Measurement Period Adjustments

Measurement period adjustments associated with the Company's 2013 acquisitions have been reflected as follows (in millions):



As of December 31, 2013:	As Previously Reported		Measurement Period Adjustments			As Revised
Current assets	$	1,306.0	$	1.0		$	1,307.0
Goodwill	$	899.4	$	2.6		$	902.0
Current liabilities	$	825.5	$	3.7		$	829.2
Long-term deferred tax liabilities, net	$	154.9	$	(0.1	)	$	154.8

Unaudited Pro Forma Information

The following unaudited supplemental pro forma financial information includes the results of operations of each of the companies acquired in 2014 and 2013 and is presented as if the acquired companies had been consolidated as of the beginning of the year immediately preceding the year in which the company was acquired. The unaudited supplemental pro forma financial information has been provided for illustrative purposes only. The unaudited supplemental pro forma financial information does not purport to be indicative of the actual results that would have been achieved by the combined companies for the periods presented, or of the results that may be achieved by the combined companies in the future. Future results may vary significantly from the results reflected in the following unaudited supplemental 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 supplemental pro forma financial information presented below has been prepared by adjusting the historical results of MasTec to include the historical results of the acquired businesses described above. The unaudited supplemental pro forma combined historical results were then adjusted (i) to remove one-time acquisition costs; (ii) to increase amortization expense resulting from the incremental intangible assets acquired in such acquisitions; (iii) to increase interest expense as a result of the cash consideration paid; and (iv) to reduce interest expense from the repayment of acquired debt. The unaudited supplemental pro forma financial information does not include any adjustments to reflect the impact of cost savings or other synergies that may result from these acquisitions. As noted above, the unaudited supplemental pro forma financial information does 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.



	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2014		2013		2014		2013
Pro forma financial information:	(unaudited, in millions)				(unaudited, in millions)
Revenue	$	1,309.6	$	1,417.5	$	3,496.0	$	3,667.3
Net income from continuing operations	$	46.0	$	52.4	$	96.5	$	118.0

Results of Businesses Acquired

Revenues and net income resulting from the year over year incremental impact of acquired businesses, which are included within the Company's consolidated results of operations for the periods indicated, were as follows:



	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2014		2013		2014		2013
Actual of acquiree (year over year impact):	(unaudited, in millions)				(unaudited, in millions)
Revenue	$	133.2	$	141.6	$	342.5	$	270.4
Net income from continuing operations ^(a)	$	2.3	$	7.5	$	4.5	$	12.8

(a)

The above results do not include acquisition costs totaling $0.4 million and $0.3 million for the three month periods ended September 30, 2014 and 2013, respectively, and $2.0 million and $1.6 million for the nine month periods ended September 30, 2014 and 2013, respectively. Acquisition costs are included within general and administrative costs in the Company's consolidated unaudited statements of operations. The above results also do not include interest expense associated with consideration paid for these acquisitions.

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).

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Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

9 Months Ended

Sep. 30, 2014

Discontinued Operations

Note 4 – Discontinued Operations

Globetec

In 2012, the Company's board of directors approved a plan of sale for Globetec Construction, LLC ("Globetec"). Accordingly, Globetec's projects and assets are reflected as assets and liabilities of discontinued operations, and Globetec's results of operations are presented as discontinued operations in the condensed unaudited consolidated financial statements for all periods presented. Effective August 31, 2013, the Company sold all of its membership interests in Globetec for nominal consideration and retained certain contingent assets and liabilities. As of September 30, 2014, the Company had certain outstanding surety bonds associated with Globetec, for which the work had been substantially completed, and for which the Company believes there was an insignificant amount at risk. The Company is not obligated to support, and does not intend to support, Globetec in the future.

The following table contains a summary of the contingent assets and liabilities associated with Globetec that were retained by the Company as of September 30, 2014 and as of December 31, 2013 (in millions):



	September 30, 2014		December 31, 2013
Current assets	$	5.0	$	2.3
Long-term assets	7.1		10.1
Assets of discontinued operations	$	12.1	$	12.4
Current liabilities of discontinued operations	$	1.2	$	1.2

The following table presents Globetec's results from discontinued operations for the periods indicated (in millions):



	For the Three Months Ended September 30, 2013			For the Nine Months Ended September 30, 2013
Revenue	$	4.8		$	18.0
Loss from operations, before tax	(0.5		)	(2.7		)
Impairment of assets, before tax	(5.7		)	(6.0		)
Income tax benefit	2.5			3.5
Net loss from discontinued operations	$	(3.7	)	$	(5.2	)

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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Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

9 Months Ended

Sep. 30, 2014

Goodwill and Other Intangible Assets

Note 5 - Goodwill and Other Intangible Assets

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



	Communications		Oil and Gas			Electrical Transmission		Power Generation and Industrial		Total Goodwill
Balance as of December 31, 2013	$	326.8	$	307.7		$	149.9	$	117.6	$	902.0
Additions from new business combinations	28.6		69.5			—		—		98.1
Accruals of acquisition-related contingent consideration, net ^(a)	4.6		—			—		—		4.6
Currency translation adjustments	—		(4.7		)	—		—		(4.7		)
Balance as of September 30, 2014	$	360.0	$	372.5		$	149.9	$	117.6	$	1,000.0


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

The following table provides a reconciliation of changes in other intangible assets (in millions):



	Other Intangible Assets
	Non-amortizing					Amortizing
	Trade Names		Pre-Qualifications			Customer Relationships and Backlog			Other ^(a)			Total
Gross carrying amount as of December 31, 2013	$	34.8	$	59.4		$	128.4		$	22.5		$	245.1
Accumulated amortization						$	(67.7	)	$	(11.8	)	$	(79.5	)
Other intangible assets, net, as of December 31, 2013	$	34.8	$	59.4		$	60.7		$	10.7		$	165.6
Additions from new business combinations	—		41.2			33.1			2.7			77.0
Amortization expense						(15.7		)	(1.3		)	(17.0		)
Currency translation adjustments	—		(2.6		)	(0.8		)	—			(3.4		)
Other intangible assets, net, as of September 30, 2014	$	34.8	$	98.0		$	77.3		$	12.1		$	222.2


(a)	Consists principally of amortizing trade names and non-compete agreements.

Amortization expense associated with intangible assets for the three month periods ended September 30, 2014 and 2013 totaled $6.6 million and $5.8 million, respectively, and totaled $17.0 million and $15.2 million, respectively, for the nine month periods ended September 30, 2014 and 2013.

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

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Note 6 – 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, life insurance assets, 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: (i) Level 1 - quoted market prices in active markets for identical assets or liabilities; (ii) Level 2 - observable market based inputs or other observable inputs; and (iii) Level 3 - significant unobservable inputs that cannot be corroborated by observable market data, which are generally determined using valuation models incorporating management’s estimates of market participant assumptions.

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 is 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.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

As of September 30, 2014, financial instruments required to be measured at fair value on a recurring basis consisted primarily of acquisition-related contingent consideration. This acquisition-related contingent consideration 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 ("ASC 805 contingent consideration"). The fair value of the Company's ASC 805 contingent consideration, which was determined using Level 3 inputs, totaled $149.6 million and $165.4 million, respectively, as of September 30, 2014 and December 31, 2013. The fair value of ASC 805 contingent consideration is based on management estimates and entity-specific assumptions and is evaluated on an on-going basis.

There were no additions to ASC 805 contingent consideration from new business combinations for the three month period ended September 30, 2014. Additions to ASC 805 contingent consideration totaled $35.0 million for the nine month period ended September 30, 2014, and totaled $3.3 million and $30.0 million for the three and nine month periods ended September 30, 2013, respectively. The Company paid approximately $1.3 million and $48.3 million of ASC 805 contingent consideration for the three and nine month periods ended September 30, 2014, respectively. There were no ASC 805 contingent consideration payments made for the three month period ended September 30, 2013. For the nine month period ended September 30, 2013, the Company paid approximately $2.7 million of ASC 805 contingent consideration. Foreign currency translation gains and/or losses associated with ASC 805 contingent consideration are included in other comprehensive income. For the three and nine month periods ended September 30, 2014, foreign currency translation gains associated with ASC 805 contingent consideration totaled $2.9 million and $2.5 million, respectively. For the three month period ended September 30, 2013, foreign currency translation losses associated with ASC 805 contingent consideration totaled $0.7 million, and for the nine month period ended September 30, 2013, foreign currency translation gains associated with ASC 805 contingent consideration totaled $1.1 million.

Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis

Assets and liabilities recognized or disclosed at fair value on a non-recurring basis, which are initially measured at fair value, and are subsequently remeasured in the event of an impairment or other measurement event, if applicable, include items such as cost and equity method investments, life insurance assets, long-lived assets, goodwill, other intangible assets and debt.

Carrying amounts and estimated fair values of selected financial instruments measured on a non-recurring basis as of the dates indicated were as follows (in millions):



	September 30, 2014				December 31, 2013
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
4.875% Senior Notes	$	400.0	$	377.0	$	400.0	$	380.0
2009 Convertible Notes	$	3.0	$	5.9	$	12.6	$	26.6
2011 Convertible Notes	$	97.0	$	192.1	$	198.3	$	428.3

The estimated fair values of the Company’s 4.875% Senior Notes, 2009 Convertible Notes and 2011 Convertible Notes are based on quoted market prices, a Level 1 input.

Cost and Equity Method Investments. The aggregate carrying value of the Company's cost and equity method investments, including long-term receivables from investees and contractual joint ventures, totaled approximately $15.0 million and $15.8 million as of September 30, 2014 and December 31, 2013, respectively. The fair values of the Company's cost and equity method investments are not readily available nor has the Company estimated the fair value of these investments. The Company is not aware of any events or changes in circumstance that would have a significant adverse effect on the carrying value of its cost or equity method investments as of September 30, 2014 or December 31, 2013.

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.

Accounts Receivable, Net of Allowance

Accounts Receivable, Net of Allowance

9 Months Ended

Sep. 30, 2014

Receivables [Abstract]

Note 7 - Accounts Receivable, Net of Allowance

The following table provides details of accounts receivable, net of allowance, as of the dates indicated (in millions):



	September 30, 2014			December 31, 2013
Contract billings	$	775.6		$	606.5
Retainage	179.3			159.3
Costs and earnings in excess of billings	451.7			384.6
Accounts receivable, gross	$	1,406.6		$	1,150.4
Less allowance for doubtful accounts	(16.7		)	(15.7		)
Accounts receivable, net	$	1,389.9		$	1,134.7

Provisions for doubtful accounts for the three month periods ended September 30, 2014 and 2013 totaled $0.3 million and $1.9 million, respectively, and totaled $1.1 million and $4.4 million, respectively, for the nine month periods ended September 30, 2014 and 2013.

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.

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

9 Months Ended

Sep. 30, 2014

Property and Equipment, Net

Note 8 - Property and Equipment, Net

The following table provides details of property and equipment, net, including property and equipment held under capital leases as of the dates indicated (in millions):



	September 30, 2014			December 31, 2013
Land	$	4.6		$	4.8
Buildings and leasehold improvements	19.2			18.0
Machinery and equipment	901.6			727.1
Office furniture and equipment	118.1			102.5
Construction in progress	17.2			11.0
Total property and equipment	$	1,060.7		$	863.4
Less accumulated depreciation and amortization	(446.3		)	(375.3		)
Property and equipment, net	$	614.4		$	488.1

Depreciation and amortization expense associated with property and equipment for the three month periods ended September 30, 2014 and 2013 totaled $35.2 million and $32.0 million, respectively, and totaled $95.0 million and $87.9 million, respectively, for the nine month periods ended September 30, 2014 and 2013.

Debt

9 Months Ended

Sep. 30, 2014

Debt Disclosure [Abstract]

Debt

Note 9 - Debt

The following table provides details of the carrying values of long-term debt as of the dates indicated (in millions):



Description	Maturity Date	September 30, 2014			December 31, 2013
Senior secured credit facility	October 29, 2018	$	449.5		$	53.0
4.875% senior notes	March 15, 2023	400.0			400.0
2011 4.0% senior convertible notes	June 15, 2014	—			103.8
2011 4.25% senior convertible notes	December 15, 2014	96.4			94.5
2009 4.0% senior convertible notes	June 15, 2014	—			9.6
2009 4.25% senior convertible notes	December 15, 2014	3.0			3.0
Other credit facilities	Varies	4.8			—
Capital lease obligations, weighted average interest rate of 2.8%	In installments through June 13, 2021	163.6			126.0
Notes payable, equipment, weighted average interest rate of 2.9%	In installments through September 1, 2018	42.8			26.9
Total debt		$	1,160.1		$	816.8
Less current maturities		(71.8		)	(51.4		)
Long-term debt		$	1,088.3		$	765.4

Senior Secured Credit Facility

In June 2014, the Company amended its senior secured credit facility, referred to as the Credit Facility, to increase aggregate borrowing commitments from $750 million to $1 billion, add the capability to borrow in Mexican pesos in addition to Canadian dollars, and increase the maximum amount that can be borrowed in alternate currencies to $200 million from $100 million. The amended Credit Facility, which matures on October 29, 2018, has an accordion feature permitting the Company to increase revolving commitments and/or establish additional term loan tranches in an aggregate amount of up to $250 million. As of September 30, 2014 and December 31, 2013, the Company had outstanding revolving loans under the Credit Facility of $449.5 million and $53.0 million, respectively, which accrued interest at weighted average rates of approximately 2.12% and 2.14% per annum, respectively. Letters of credit of approximately $135.6 million and $134.8 million were issued as of September 30, 2014 and December 31, 2013, respectively. As of September 30, 2014, interest on letters of credit accrued at 0.875% per annum for performance standby letters of credit and at 1.75% per annum for financial standby letters of credit. As of December 31, 2013, interest on letters of credit accrued at 0.75% per annum for performance standby letters of credit and at 1.5% per annum for financial standby letters of credit. Outstanding letters of credit mature at various dates and most have automatic renewal provisions, subject to prior notice of cancellation. As of September 30, 2014 and December 31, 2013, the remaining borrowing capacity of the Company's Credit Facility of $262.5 million and $562.1 million, respectively, was available for revolving loans, or up to $262.5 million and $315.2 million, respectively, of new letters of credit. Total remaining borrowing capacity as of September 30, 2014 included a temporary reduction of approximately $152 million, which will be restored once the Company's 4.25% Convertible Notes mature and are repaid or converted in December 2014. The unused facility fee was 0.35% and 0.30% as of September 30, 2014 and December 31, 2013, respectively. The Credit Facility is guaranteed by certain subsidiaries of the Company.

Other Credit Facilities. To support the working capital requirements of its foreign operations, primarily in Canada, the Company has entered into certain other credit facilities. Borrowings under these other credit facilities are primarily denominated in Canadian dollars. As of September 30, 2014, the Company had maximum borrowing capacity under these credit facilities of $35.0 million Canadian dollars, or approximately $31.3 million U.S. dollars. Outstanding borrowings totaled approximately $5.4 million Canadian dollars, or approximately $4.8 million U.S. dollars, as of September 30, 2014, and accrued interest at a weighted average rate of 4.00%. The Company's other credit facilities, which have varying dates of maturity through March 3, 2015, are generally renewed on an annual basis. Outstanding borrowings under the Company's other credit facilities that are not renewed are repaid with borrowings under the Credit Facility. Accordingly, the carrying amounts of the Company's borrowings under other credit facilities are classified within long-term debt in the Company's condensed unaudited consolidated balance sheet as of September 30, 2014. The Company's other credit facilities are subject to customary provisions and covenants.

Senior Convertible Notes

The Company's 4.0% Convertible Notes, composed of $105.3 million principal amount of 2011 4.0% Notes and $9.6 million principal amount of 2009 4.0% Notes, matured and were converted in June 2014. The 2009 4.0% Notes were convertible at a rate of 63.4417 shares of MasTec common stock per $1,000 principal amount thereof, representing an initial conversion price of approximately $15.76 per share, resulted in MasTec issuing an aggregate of 0.6 million shares of its common stock. The 2011 4.0% Notes were substantially identical to the 2009 4.0% Notes, except that the 2011 4.0% Notes had an optional physical (share), cash or combination settlement feature. In accordance with the Company's previously stated intent, it settled the principal amount of the 2011 4.0% Notes in cash, using proceeds from the Credit Facility, and the premium value in shares of common stock. Pursuant to the formula contained in the indenture governing the 2011 4.0% Notes, the Company issued 3.6 million shares of common stock to settle the premium value of the 2011 4.0% Notes. The value of the shares issued to settle the premium was $114.8 million, based on the closing price of the Company's common stock on the date the shares were issued. The 4.2 million aggregate shares issued in settlement of the 4.0% Convertible Notes were issued from the Company's treasury stock. See Note 13 - Equity.

The 4.25% Convertible Notes mature in December 2014. The Company expects to settle the principal amount of its 2011 4.25% Notes on a long-term basis with proceeds from the Credit Facility, or through other sources of available funding, and the premium value in shares, consistent with the settlement of the 2011 4.0% Notes in June 2014. Therefore, the Company has reflected the carrying amounts of these notes within long-term debt in the condensed unaudited consolidated balance sheets. Unamortized debt discount and financing costs associated with the 2011 4.25% Notes totaled $0.6 million as of September 30, 2014. Unamortized debt discount and financing costs associated with both the 2011 4.25% Notes and the 2011 4.0% Notes totaled $4.0 million as of December 31, 2013.

Debt Guarantees and Covenants

The Company’s 4.875% Senior Notes, 2011 Convertible Notes and 2009 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 Credit Facility or other outstanding indebtedness. See Note 18 - Supplemental Guarantor Condensed Unaudited Consolidating Financial Information.

MasTec was in compliance with the provisions and covenants of its outstanding debt instruments as of September 30, 2014 and December 31, 2013.

Interest Expense, Net

The following table provides details of interest expense, net, for the periods indicated (in millions):



	For the Three Months Ended September 30,					For the Nine Months Ended September 30,
	2014			2013		2014			2013
Interest expense:
Contractual and other interest expense	$	11.3		$	10.4	$	31.6		$	27.9
Accretion of senior convertible note discount	0.6			1.3		3.4			3.9
Amortization of deferred financing costs	0.8			1.0		2.7			3.0
Total interest expense	$	12.7		$	12.7	$	37.7		$	34.8
Interest income	(0.1		)	—		(0.1		)	(0.3		)
Interest expense, net	$	12.6		$	12.7	$	37.6		$	34.5

For additional information regarding the Company's debt instruments, see Note 9 - Debt in the notes to the Company's consolidated financial statements included in its Annual Report on Form 10-K for the year ended December 31, 2013.

Lease Obligations	9 Months Ended
Lease Obligations	Sep. 30, 2014
Leases [Abstract]
Lease Obligations	Note 10 - Lease Obligations Capital Leases MasTec enters into agreements that provide financing for machinery and equipment, which expire on various dates. The gross amount of assets held under capital leases as of September 30, 2014 and December 31, 2013 totaled $276.2 million and $199.6 million, respectively. Assets held under capital leases, net of accumulated depreciation, totaled $203.7 million and $141.3 million as of September 30, 2014 and December 31, 2013, respectively. 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. Rent expense relating to operating leases that have non-cancelable terms in excess of one year was approximately $18.1 million and $12.7 million for the three month periods ended September 30, 2014 and 2013, respectively, and $51.5 million and $37.1 million for the nine month periods ended September 30, 2014 and 2013, respectively. The Company also incurred expenses relating to facilities, vehicles and equipment having original terms of one year or less of approximately $54.5 million and $63.0 million for the three month periods ended September 30, 2014 and 2013, respectively, and $142.6 million and $138.9 million for the nine month periods ended September 30, 2014 and 2013, respectively.

Stock-Based Compensation and Other Employee Benefit Plans

9 Months Ended

Sep. 30, 2014

Share-based Compensation [Abstract]

Stock-Based Compensation and Other Employee Benefit Plans

Note 11 – Stock-Based Compensation and Other Employee Benefit Plans

The Company has stock-based compensation plans, under which stock options and restricted share awards are available for issuance or outstanding. Under stock-based compensation plans in effect as of September 30, 2014, there were a total of 6,193,235 shares available for grant or issuance.

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 September 30, 2014 was approximately $16.0 million, which is expected to be recognized over a weighted average period of approximately 1.1 years. The intrinsic value, or fair value, of restricted share awards that vested, which is based on the market price on the date of vesting, totaled $1.1 million and $0.9 million for the three month periods ended September 30, 2014 and 2013, respectively, and totaled $7.1 million and $2.0 million for the nine month periods ended September 30, 2014 and 2013, respectively.



Activity, restricted share awards:	Restricted Shares		Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2013	1,123,545		$	23.78
Granted	323,249		41.05
Vested	(181,195	)	20.26
Canceled/forfeited	(22,442	)	17.38
Non-vested restricted shares, as of September 30, 2014	1,243,157		$	28.90

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. All outstanding stock options are fully vested.



Activity, stock options:	Stock Options		Per Share Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value ^(a) (in millions)
Options outstanding as of December 31, 2013	495,571		$	11.17	1.96	$	10.7
Exercised	(210,900	)	9.97
Canceled/forfeited	—		—
Options outstanding as of September 30, 2014	284,671		$	12.06	1.54	$	5.3
Options exercisable as of September 30, 2014	284,671		$	12.06	1.54	$	5.3


(a)	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.

The total intrinsic value of options exercised was based on the difference between the exercise price and the market price of the Company’s stock on the date of exercise. During the three month period ended September 30, 2014, there were no options exercised. For the three month period ended September 30, 2013, the intrinsic value of options exercised totaled $4.6 million. The total intrinsic value of options exercised during the nine month periods ended September 30, 2014 and 2013 totaled $6.5 million and $10.4 million, respectively. Proceeds from options exercised during the three month period ended September 30, 2013 totaled $0.4 million. Proceeds from options exercised during the nine month periods ended September 30, 2014 and 2013 totaled $0.8 million and $3.8 million, respectively.

Employee Stock Purchase Plans

The Company's employee stock purchase plans allow qualified employees to purchase MasTec common stock at 85% of its fair market value at the lower of (i) the date of commencement of the offering period or (ii) the last day of the exercise period, as defined in the plan documents. The fair value of purchases under the Company's employee stock purchase plans is estimated using the Black-Scholes option-pricing valuation model.



	Nine Months Ended September 30,
Activity, employee stock purchase plan:	2014		2013
Cash proceeds (in millions)	$	2.5	$	6.0
Common shares issued	94,761		436,925
Weighted average per share price	$	26.60	$	13.69
Weighted average per share grant date fair value	$	6.34	$	5.55

Stock-Based Compensation Expense and Tax Benefits

Details of stock-based compensation expense, which is included within general and administrative expense in the condensed unaudited consolidated statement of operations for the periods indicated are as follows (in millions):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2014		2013		2014		2013
Stock-based compensation expense	$	4.1	$	3.0	$	11.6	$	9.6
Income Tax Effects:
Income tax benefit from stock-based compensation	$	1.8	$	4.5	$	8.4	$	7.7
Excess tax benefit from stock-based compensation ^(a)	$	0.1	$	3.0	$	3.5	$	4.4


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

Other Retirement Plans

9 Months Ended

Sep. 30, 2014

Multiemployer Plans [Abstract]

Other Retirement Plans

Note 12 – Other Retirement Plans

Multi-Employer Plans. Certain of MasTec’s subsidiaries contribute amounts to multi-employer pension and other multi-employer benefit plans and trusts. Contributions are generally based on fixed amounts per hour per employee for employees covered under these plans. 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. Total contributions to multi-employer plans, and the related number of employees covered by these plans, for the periods indicated ranged as follows:



	Multi-Employer Plans
	Covered Employees		Contributions (in millions)
For the Three Months Ended September 30:	Low	High	Pension		Post-Retirement Benefit		Total
2014	2,029	2,167	$	11.6	$	1.1	$	12.7
2013	2,392	2,734	$	14.9	$	1.0	$	15.9
For the Nine Months Ended September 30:	Low	High	Pension		Post-Retirement Benefit		Total
2014	1,098	2,167	$	27.3	$	2.5	$	29.8
2013	778	2,734	$	30.2	$	3.0	$	33.2

Equity

9 Months Ended

Sep. 30, 2014

Equity [Abstract]

Equity

Note 13 – Equity



Share Activity (in thousands):	Common Shares Outstanding		Treasury Shares
Balance as of December 31, 2013	77,258		9,467
Shares issued:
Stock option exercises	211
Restricted share awards	181
Convertible notes	4,204		(4,204	)
Other, net	(11	)
Balance as of September 30, 2014	81,843		5,263

In June 2014, the Company reissued a total of 4.2 million shares of its treasury stock, which had a cost basis of $66.6 million, related to the settlement of its 4.0% Convertible Notes. See Note 9 - Debt.

Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive loss by component during the periods indicated are as follows (in thousands):



	For the Nine Months Ended September 30,
	2014									2013
	Unrealized (Losses) Gains
	Foreign Currency			Other			Total			Foreign Currency			Other			Total
Balance as of January 1	$	(7,998	)	$	(5,288	)	$	(13,286	)	$	(106	)	$	(5,395	)	$	(5,501	)
Activity before reclassifications, net of tax	(10,601		)	—			(10,601		)	(3,839		)	(118		)	(3,957		)
Reclassifications, net of tax	—			—			—			—			(440		)	(440		)
Activity, net of tax	(10,601		)	—			(10,601		)	(3,839		)	(558		)	(4,397		)
Balance as of September 30	$	(18,599	)	$	(5,288	)	$	(23,887	)	$	(3,945	)	$	(5,953	)	$	(9,898	)

Foreign currency activity is primarily related to the Company's Canadian operations. The Company's Canadian presence has grown in recent years due to acquisitions. See Note 3 - Acquisitions.

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Segments and Related Information

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Note 14 - Income Taxes The Company’s consolidated tax rates on income from continuing operations for the three month periods ended September 30, 2014 and 2013 were 38.0% and 38.8%, respectively, and for the nine month periods ended September 30, 2014 and 2013 were 38.0% and 38.6%, respectively. In determining the quarterly provision for income taxes, management uses an estimated annual effective tax rate based on forecasted annual pre-tax income, permanent tax differences, statutory tax rates and tax planning opportunities in the various jurisdictions in which the Company operates. The impact of significant discrete items is separately recognized in the quarter(s) in which they occur. As of September 30, 2014, the Company had $9.3 million of current deferred tax assets, net, and $180.4 million of long-term deferred tax liabilities, net. As of December 31, 2013, current deferred tax assets, net, totaled $16.3 million and long-term deferred tax liabilities, net, totaled $154.8 million.

Segments and Related Information

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Note 15 - Segments and Related Information

Segment Discussion

MasTec presents its continuing operations in five reportable segments: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (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. 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/fiber communications and install-to-the-home customers, and, to a lesser extent, infrastructure for electrical utilities. MasTec performs engineering, construction and maintenance services on oil and natural gas pipelines and processing facilities for the energy and utilities industries through its Oil and Gas segment. The Electrical Transmission segment primarily serves the energy and utility industries through the engineering, construction and maintenance of electrical transmission lines and substations. The Power Generation and Industrial segment primarily serves energy, utility and other end-markets through the installation and construction of conventional and renewable power facilities, related electrical transmission infrastructure, ethanol facilities and various types of industrial infrastructure. The Other segment primarily includes small business units that perform construction services for a variety of end markets in Mexico and elsewhere internationally.

Earnings before interest, taxes, depreciation and amortization (“EBITDA”) is the measure of profitability used by management to manage its segments and, accordingly, in its segment reporting. As appropriate, the Company supplements the reporting of consolidated financial information determined in accordance with U.S. GAAP with certain non-U.S. GAAP financial measures, including EBITDA. The Company believes these non-U.S. GAAP measures provide meaningful information that helps investors understand the Company's financial results and assess its prospects for future performance. The Company uses EBITDA to evaluate its performance, both internally and versus that of its peers, because it excludes certain items that may not be indicative of the Company's 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.

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):



	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
Revenue:	2014			2013			2014			2013
Communications ^(a)	$	505.2		$	543.0		$	1,480.4		$	1,464.5
Oil and Gas	557.4			519.1			1,302.9			1,134.8
Electrical Transmission	132.6			118.8			327.2			321.9
Power Generation and Industrial	114.3			85.1			263.1			237.3
Other	1.1			3.5			6.5			9.2
Eliminations	(1.0		)	(0.1		)	(1.9		)	(2.0		)
Consolidated revenue	$	1,309.6		$	1,269.4		$	3,378.2		$	3,165.7


(a)	Revenue generated by utilities customers represented 7.6% and 6.9% of Communications segment revenue for the three month periods ended September 30, 2014 and 2013, respectively, and 7.0% and 7.2% of Communications segment revenue for the nine month periods ended September 30, 2014 and 2013, respectively.



	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
EBITDA:	2014			2013			2014			2013
Communications	$	52.4		$	71.8		$	153.7		$	181.6
Oil and Gas	73.0			68.1			143.5			161.7
Electrical Transmission	12.7			12.1			33.2			27.0
Power Generation and Industrial	4.9			(6.4		)	9.4			(14.6		)
Other	(0.3		)	0.1			0.1			0.5
Corporate	(14.5		)	(13.6		)	(38.7		)	(47.9		)
Consolidated EBITDA	$	128.2		$	132.1		$	301.2		$	308.3



	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
Depreciation and Amortization:	2014		2013		2014		2013
Communications	$	10.1	$	9.5	$	30.1	$	26.8
Oil and Gas	23.3		22.5		61.3		60.1
Electrical Transmission	5.2		3.2		11.9		8.4
Power Generation and Industrial	1.7		1.7		4.8		5.1
Corporate	1.4		0.9		3.9		2.7
Consolidated Depreciation and Amortization	$	41.7	$	37.8	$	112.0	$	103.1

The following table presents a reconciliation of EBITDA to consolidated income from continuing operations before income taxes (in millions):



	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
EBITDA Reconciliation:	2014			2013			2014			2013
EBITDA	$	128.2		$	132.1		$	301.2		$	308.3
Less:
Interest expense, net	(12.6		)	(12.7		)	(37.6		)	(34.5		)
Depreciation and amortization	(41.7		)	(37.8		)	(112.0		)	(103.1		)
Income from continuing operations before income taxes	$	73.8		$	81.6		$	151.7		$	170.6

Foreign Operations. MasTec operates throughout North America, primarily in the U.S. and Canada, as well as in parts of Latin America. For the three month periods ended September 30, 2014 and 2013, revenues of $1.1 billion and $1.2 billion, respectively, were derived from U.S. operations, and $219.4 million and $90.9 million, respectively, were derived from foreign operations, primarily in Canada. For the nine month periods ended September 30, 2014 and 2013, revenues of $2.9 billion and $3.0 billion, respectively, were derived from U.S. operations, and $460.0 million and $172.0 million, respectively, were derived from foreign operations, primarily in Canada. Long-lived assets held in the U.S. included property and equipment, net, of $497.6 million and $436.9 million as of September 30, 2014 and December 31, 2013, respectively. Long-lived assets held in foreign countries, primarily in Canada, included property and equipment, net, of $116.8 million and $51.2 million as of September 30, 2014 and December 31, 2013, respectively. Intangible assets and goodwill, net, of approximately $1.0 billion as of both September 30, 2014 and December 31, 2013 related to the Company's U.S. operations. Intangible assets and goodwill, net, of approximately $211.5 million and $92.9 million as of September 30, 2014 and December 31, 2013, respectively, related to businesses in foreign countries, primarily in Canada.

Significant Customers

Revenue concentration information for significant customers as a percentage of total consolidated revenue was as follows:



	For the Three Months Ended September 30,		For the Nine Months Ended September 30,
	2014	2013	2014	2013
Customer:
AT&T ^(a)	16%	16%	21%	18%
DIRECTV^{® (b)}	12%	13%	13%	15%
Enbridge, Inc. ^(c)	10%	20%	10%	14%


(a)	The Company's relationship with AT&T is based upon master service agreements, other service agreements and construction/installation contracts for AT&T's wireless, wireline/fiber and home security and automation businesses. Revenue from AT&T is included in the Communications segment.


(b)	The Company's relationship with DIRECTV® is based upon an agreement to provide installation and maintenance services for DIRECTV®. Revenue from DIRECTV® is included in the Communications segment.


(c)	The Company's relationship with Enbridge, Inc. is based upon various construction contracts for natural gas pipelines. Revenue from Enbridge, Inc. is included in the Oil and Gas 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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Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 16 - 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. The outcome of such cases, claims and disputes, including those set forth below, cannot be predicted with certainty and an unfavorable resolution of one or more of them could have a material adverse effect on the Company's business, financial condition, results of operations and cash flows. SunLight Entities. In 2011, Power Partners MasTec, LLC., a MasTec, Inc. subsidiary (“Power Partners”), entered into engineering, procurement, and construction agreements (the “EPC Agreements”) with special purpose entities, SunLight General Somerset Solar, LLC, SunLight General Morris Solar, LLC and SunLight General Sussex Solar, LLC (collectively, the “SunLight Entities”), respectively, to perform design and construction services for three public solar projects in New Jersey located in Somerset, Morris and Sussex Counties (the “Projects”). The initial contract price of each of the Projects was, subject to adjustment, approximately as follows: Somerset ($29 million); Morris ($36 million); and Sussex ($26 million). The Projects were funded, in part, with proceeds of municipal bonds issued by the Morris County and Somerset County Improvement Authorities (collectively, the “Authorities”). Power Partners and the SunLight Entities engaged in three separate arbitration proceedings against each other to address various disputes that existed between the parties on the Projects. The arbitration panel rendered awards in Power Partners’ favor in the aggregate amount of $59.6 million in August 2014. The arbitrators found that SunLight breached the EPC Agreements, that Power Partners had the right to terminate the EPC Agreements for cause because of the SunLight Entities’ breach of contract and breach of the covenant of good faith and fair dealing. The arbitrators dismissed all of the SunLight Entities’ affirmative claims. Power Partners has filed a petition in federal court in New Jersey as part of the process of confirming the arbitration awards into final judgments against the SunLight Entities. The arbitrators also held that Power Partners was the prevailing party and that it is entitled to an additional award of interest, attorney’s fees and costs. Power Partners has filed an application with the arbitration panel to set the amount of interest, attorney’s fees and costs and expects a ruling before the end of the year. Power Partners intends to vigorously pursue collection of all arbitration awards including interest, attorney's fees and costs. Power Partners believes it will successfully collect the arbitration awards, however, there can be no assurance that its collection efforts will be successful or that Power Partners will recover all amounts previously recorded. As part of its collection efforts, Power Partners filed municipal mechanic’s liens and construction liens of approximately $50 million against the solar projects and public construction funds for the work Power Partners had performed on the Projects. SunLight Entities and the Authorities challenged the mechanic’s liens and construction liens in court. In March 2014, a New Jersey appellate court found that Power Partners did not have municipal mechanic’s liens or construction liens on the municipal bond funds that are held in trust to pay for construction of the Projects. Power Partners petitioned the New Jersey Supreme Court to review the appellate court’s ruling, and, in July 2014, the New Jersey Supreme Court agreed to accept the case for review and also entered an order staying the appellate court’s ruling. Power Partners also filed a lawsuit in June 2013 in federal court in New Jersey against the Authorities and the principals of the SunLight Entities with claims exceeding $60 million as part of its efforts to seek payment of amounts that were also the subject of the arbitration proceedings. The claims against the Authorities include violations of the New Jersey Public Works Bond Act, violations of the New Jersey Construction Trust Fund Act, tortious interference with Power Partners' contract rights, unjust enrichment and quantum meruit for the value of the work performed by Power Partners. 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. See Note 10 - Lease Obligations. 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 September 30, 2014 and December 31, 2013, there were $135.6 million and $134.8 million, respectively, of letters of credit issued under the Company's Credit Facility. See Note 9 - Debt. The Company was not aware of any material claims relating to outstanding letters of credit as of September 30, 2014 or December 31, 2013. Performance and Payment Bonds. In the ordinary course of business, MasTec is required by certain customers to provide performance and payment bonds for certain of its contractual commitments associated with 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 September 30, 2014, the estimated cost to complete projects secured by the Company’s $748.6 million in performance and payment bonds was $53.1 million. As of December 31, 2013, the estimated cost to complete projects secured by the Company’s $1.1 billion in performance and payment bonds was $297.1 million. Investments in Affiliates and Other Entities. The Company holds an undivided interest in a contractual joint venture with a third party for the purpose of providing infrastructure construction services under certain customer contracts. Losses incurred by the joint venture are generally shared proportionally by the joint venture members, with members of the joint venture jointly and severally liable for all of the obligations of the joint venture. The joint venture agreement provides that each joint venturer indemnify the other parties for any liabilities incurred. Thus, it is possible that the Company could be required to pay or perform obligations in excess of its share if the other joint venturer fails or refuses to pay or perform its share of the obligations. As of September 30, 2014, the Company was not aware of any circumstances that would lead to future claims against it for material amounts. In addition, from time to time, the Company may provide financing to its unconsolidated affiliates. As of September 30, 2014, there were no amounts committed under such financing arrangements. Self-Insurance. MasTec maintains insurance policies for workers’ compensation, general liability and automobile liability, which are subject to per claim deductibles. The Company also maintains excess umbrella coverage. As of September 30, 2014 and December 31, 2013, 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, totaled $60.3 million and $50.8 million, respectively, of which $36.3 million and $31.3 million, respectively, was reflected within non-current other liabilities in the condensed unaudited consolidated balance sheets. MasTec also maintains an insurance policy with respect to employee group medical claims, which is subject to annual per employee maximum losses. MasTec’s liability for employee group medical claims as of September 30, 2014 and December 31, 2013 totaled $1.9 million and $2.1 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. Insurance-related letters of credit for the Company's workers' compensation, general liability and automobile liability policies amounted to $57.2 million and $57.4 million as of September 30, 2014 and December 31, 2013, respectively. In addition, cash collateral deposited with insurance carriers, which is included in other long-term assets in the condensed unaudited consolidated balance sheets, amounted to $1.1 million and $1.4 million for these policies as of September 30, 2014 and December 31, 2013, respectively. Outstanding surety bonds related to workers’ compensation self-insurance programs amounted to $13.0 million and $10.9 million as of September 30, 2014 and December 31, 2013, 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 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 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 (collectively, “ERISA”), which governs U.S. registered multi-employer pension plans, 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 U.S. registered multi-employer defined benefit plans, a plan’s termination, an employer’s voluntary withdrawal from, or the mass withdrawal of 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 to U.S. registered plans that are generally applicable to plan years beginning after 2007 for multi-employer plans 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. Based upon the information available to the Company from plan administrators as of September 30, 2014, several of the multi-employer pension plans in which it participates are underfunded and, as a result, the Company could be required to increase its contributions. 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 that is in critical status. In connection with this withdrawal, a $6.4 million withdrawal liability was established based on an estimate provided by the Central States administrator of such liability as of the date of withdrawal. The Company began paying installments towards this withdrawal liability in 2013, of which $4.5 million was outstanding as of September 30, 2014. The Company withdrew from Central States in order to mitigate its liability in connection with the plan; however, Central States has asserted that the PLCA members did not effectively withdraw in 2011 and are, therefore, responsible for a withdrawal liability that includes 2011 contribution amounts. By letter dated March 14, 2013, Central States demanded $11 million in withdrawal liability from the Company, which included 2011 contribution amounts. The Company is vigorously opposing this demand because it believes that it legally and effectively withdrew from Central States on November 15, 2011. If Central States were to prevail in its assertion that the Company withdrew after that date, then the initial amount of the Company’s withdrawal liability would increase to approximately $11 million. The Company currently does not have plans to withdraw from any other multi-employer pension plan. 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 September 30, 2014 and December 31, 2013, 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 has also issued performance and other guarantees in connection with its undivided interest in a contractual joint venture and certain of its equity investees. See Note 3 - Acquisitions. MasTec 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. Concentrations of Risk. The Company had approximately 480 customers for the nine month period ended September 30, 2014. For the three month periods ended September 30, 2014 and 2013, the Company derived 64% and 73% respectively, of revenues from its top ten customers. For the nine month periods ended September 30, 2014 and 2013, the Company derived 66% and 69%, respectively, of revenues from its top ten customers. See Note 15 - Segments and Related Information for significant customer revenue concentration information.

Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2014
Related Party Transactions [Abstract]
Related Party Transactions	Note 17 - Related Party Transactions MasTec purchases, rents and leases equipment used in its business from a number of different vendors on a non-exclusive basis, including Cross Country Pipeline Supply, Inc. (“CCP”), in which MasTec invested $15 million in the fourth quarter of 2013, and which is accounted for as a cost method investment. Juan Carlos Mas, who is the brother of Jorge Mas, Chairman of MasTec's Board of Directors, and Jose Mas, MasTec's Chief Executive Officer, serves as the chairman of CCP. In addition, an entity owned by the Mas family, including Jorge and Jose Mas, is a minority shareholder of CCP. MasTec paid CCP approximately $1.9 million and $4.6 million for equipment rentals, leases and servicing for the three and nine month periods ended September 30, 2014, respectively. MasTec leases employees to a customer, in which Jorge Mas and Jose Mas own a minority interest. For the three month periods ended September 30, 2014 and 2013, MasTec charged approximately $0.2 million and $0.1 million, respectively, to this customer. For the nine month periods ended September 30, 2014 and 2013, MasTec charged approximately $0.5 million and $0.4 million, respectively, to this customer. As of both September 30, 2014 and December 31, 2013, receivables of $0.1 million attributable to this arrangement were outstanding. The Company also provides satellite communication services to this customer. For the three month periods ended September 30, 2014 and 2013, satellite communication revenues relating to this customer were approximately $0.3 million and $0.4 million, respectively. For the nine month periods ended September 30, 2014 and 2013, satellite communication revenues relating to this customer were approximately $0.8 million and $1.0 million, respectively. As of both September 30, 2014 and December 31, 2013, outstanding receivables from this arrangement totaled $0.4 million. See Note 3 - Acquisitions for discussion of the Company's equity method investments and contractual joint venture. Split Dollar Agreements In August 2014, Jose Mas, the Company and Jorge Mas, Juan Carlos Mas and Patricia Mas, as trustees of the Jose Ramon Mas Irrevocable Trust, dated December 7, 2012 (the “trust”) entered into a split dollar life insurance agreement that replaces the prior split dollar agreement and eliminates the deferred bonus agreement with Jose Mas. Under the new split dollar agreement, MasTec is the sole owner of each of the policies subject to the agreement. The Company will make the premium payments under each of such policies. Upon the death of Jose Mas or the survivor of Jose Mas and his wife (collectively, the “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) premiums paid by the Company on such policy and (ii) the then cash value of such policy (excluding surrender charges or other similar charges or reductions) immediately before the triggering death. The balance of the death benefit is payable to the trust or other beneficiary designated by the trustees. In the event of the Company’s bankruptcy or dissolution, the trust shall have the assignable option to purchase any or all of the policies subject to the split dollar agreement from the Company. The purchase price for each policy shall be the greater of (x) premiums paid by the Company on such policy or (y) the then cash value of such policy (excluding surrender charges or other similar charges or reductions). The total maximum face amount of the insurance for policies subject to the split dollar agreement is capped at $75 million. The Company is designated as the named fiduciary under the split dollar agreement, and the policy may not be surrendered without the express written consent of the trust. For the three month period ended September 30, 2014, the Company made no payments in connection with the agreements for Jose Mas, and for the nine month period ended September 30, 2014, payments were less than $0.1 million. There were no payments made in connection with the agreements for Jose Mas in either of the three or nine month periods ended September 30, 2013. MasTec also has a split dollar agreement with Jorge Mas. The Company paid approximately $1.3 million and $1.8 million in connection with this agreement for the three and nine month periods ended September 30, 2014, respectively, and paid approximately $1.1 million and $1.2 million in connection with this agreement for the three and nine month periods ended September 30, 2013, respectively. As of September 30, 2014 and December 31, 2013, life insurance assets associated with these agreements of $11.1 million and $10.2 million, respectively, were included within other long-term assets in the condensed unaudited consolidated balance sheets. For additional information regarding the split dollar and deferred bonus agreements with Jorge Mas, see Note 17 - Related Party Transactions in the notes to the Company's consolidated financial statements included in its Annual Report on Form 10-K for the year ended December 31, 2013.

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.

Condensed Unaudited Financial Statements, Supplemental Guarantor Information [Abstract]

Supplemental Guarantor Condensed Unaudited Consolidating Financial Information

9 Months Ended

Sep. 30, 2014

Supplemental Guarantor Condensed Unaudited Consolidating Financial Information

Note 18 – Supplemental Guarantor Condensed Unaudited Consolidating Financial Information

The 2011 Convertible Notes, 2009 Convertible Notes and 4.875% Senior 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 United States and certain domestic subsidiaries (collectively, the “Non-Guarantor Subsidiaries”) do not guarantee any of these notes. A Guarantor Subsidiary's guarantee is 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 such Subsidiary Guarantor, if such Subsidiary Guarantor's guarantee under the Company's 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 unaudited consolidating balance sheets and the condensed unaudited 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.

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (in millions)



For the Three Months Ended September 30, 2014:	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	1,043.1		$	268.5		$	(2.0	)	$	1,309.6
Costs of revenue, excluding depreciation and amortization	—			892.6			232.4			(2.0		)	1,123.0
Depreciation and amortization	—			30.8			10.9			—			41.7
General and administrative expenses	0.6			50.8			8.5			—			59.9
Interest expense, net	—			11.5			1.1			—			12.6
Other (income) expense, net	—			(1.6		)	0.2			—			(1.4		)
(Loss) income from continuing operations before income taxes	$	(0.6	)	$	59.0		$	15.4		$	—		$	73.8
Benefit from (provision for) income taxes	0.2			(22.0		)	(6.2		)	—			(28.0		)
Net (loss) income from continuing operations	$	(0.4	)	$	37.0		$	9.2		$	—		$	45.7
Net loss from discontinued operations	—			—			(0.3		)	—			(0.3		)
Equity in income from subsidiaries, net of tax	45.7			—			—			(45.7		)	—
Net income (loss)	$	45.3		$	37.0		$	8.9		$	(45.7	)	$	45.4
Net income attributable to non-controlling interests	—			—			0.1			—			0.1
Net income (loss) attributable to MasTec, Inc.	$	45.3		$	37.0		$	8.8		$	(45.7	)	$	45.3
Comprehensive income (loss)	$	32.3		$	37.0		$	(4.1	)	$	(32.7	)	$	32.5



For the Three Months Ended September 30, 2013:	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	1,140.9		$	129.0		$	(0.5	)	$	1,269.4
Costs of revenue, excluding depreciation and amortization	—			969.5			112.1			(0.5		)	1,081.1
Depreciation and amortization	—			31.6			6.2			—			37.8
General and administrative expenses	0.5			50.1			8.4			—			59.0
Interest expense, net	—			12.0			0.7			—			12.7
Other income, net	—			(2.3		)	(0.5		)	—			(2.8		)
(Loss) income from continuing operations before income taxes	$	(0.5	)	$	80.0		$	2.1		$	—		$	81.6
Benefit from (provision for) income taxes	0.2			(31.5		)	(0.4		)	—			(31.7		)
Net (loss) income from continuing operations	$	(0.3	)	$	48.5		$	1.7		$	—		$	49.9
Net loss from discontinued operations	—			—			(3.7		)	—			(3.7		)
Equity in income from subsidiaries, net of tax	46.4			—			—			(46.4		)	—
Net income (loss)	$	46.1		$	48.5		$	(2.0	)	$	(46.4	)	$	46.2
Net income attributable to non-controlling interests	—			—			0.1			—			0.1
Net income (loss) attributable to MasTec, Inc.	$	46.1		$	48.5		$	(2.1	)	$	(46.4	)	$	46.1
Comprehensive income (loss)	$	49.0		$	48.5		$	0.8		$	(49.3	)	$	49.0

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (in millions)



For the Nine Months Ended September 30, 2014:	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	2,798.6		$	581.7		$	(2.1	)	$	3,378.2
Costs of revenue, excluding depreciation and amortization	—			2,402.0			515.0			(2.1		)	2,914.9
Depreciation and amortization	—			88.4			23.6			—			112.0
General and administrative expenses	1.8			146.6			19.1			—			167.5
Interest expense, net	—			35.6			2.0			—			37.6
Other (income) expense, net	—			(5.8		)	0.3			—			(5.5		)
(Loss) income from continuing operations before income taxes	$	(1.8	)	$	131.8		$	21.7		$	—		$	151.7
Benefit from (provision for) income taxes	0.7			(51.2		)	(7.2		)	—			(57.7		)
Net (loss) income from continuing operations	$	(1.1	)	$	80.6		$	14.5		$	—		$	94.0
Net loss from discontinued operations	—			—			(0.6		)	—			(0.6		)
Equity in income from subsidiaries, net of tax	94.5			—			—			(94.5		)	—
Net income (loss)	$	93.4		$	80.6		$	13.9		$	(94.5	)	$	93.4
Net income attributable to non-controlling interests	—			—			—			—			—
Net income (loss) attributable to MasTec, Inc.	$	93.4		$	80.6		$	13.8		$	(94.5	)	$	93.3
Comprehensive income (loss)	$	82.8		$	80.5		$	3.4		$	(83.9	)	$	82.8



For the Nine Months Ended September 30, 2013:	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	2,881.1		$	289.0		$	(4.4	)	$	3,165.7
Costs of revenue, excluding depreciation and amortization	—			2,447.7			252.0			(4.4		)	2,695.3
Depreciation and amortization	—			88.8			14.3			—			103.1
General and administrative expenses	1.4			138.5			19.9			—			159.8
Interest expense, net	—			33.5			1.0			—			34.5
Loss on extinguishment of debt	—			5.6			—			—			5.6
Other income, net	—			(2.4		)	(0.8		)	—			(3.2		)
(Loss) income from continuing operations before income taxes	$	(1.4	)	$	169.4		$	2.6		$	—		$	170.6
Benefit from (provision for) income taxes	0.6			(66.0		)	(0.4		)	—			(65.8		)
Net (loss) income from continuing operations	$	(0.8	)	$	103.4		$	2.2		$	—		$	104.8
Net loss from discontinued operations	—			—			(5.2		)	—			(5.2		)
Equity in income from subsidiaries, net of tax	100.3			—			—			(100.3		)	—
Net income (loss)	$	99.5		$	103.4		$	(3.0	)	$	(100.3	)	$	99.6
Net income attributable to non-controlling interests	—			—			0.2			—			0.2
Net income (loss) attributable to MasTec, Inc.	$	99.5		$	103.4		$	(3.2	)	$	(100.3	)	$	99.4
Comprehensive income (loss)	$	95.1		$	102.8		$	(6.8	)	$	(95.9	)	$	95.2

CONDENSED UNAUDITED CONSOLIDATING BALANCE SHEETS (in millions)



As of September 30, 2014:	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Current assets, including discontinued operations	$	—	$	1,251.5	$	322.5	$	—		$	1,574.0
Property and equipment, net	—		475.5		138.9		—			614.4
Goodwill and other intangible assets, net	—		972.6		249.5		—			1,222.1
Investments in and advances to consolidated affiliates, net	1,114.8		—		107.3		(1,222.1		)	—
Other long-term assets, including discontinued operations	9.3		35.3		15.0		—			59.6
Total assets	$	1,124.1	$	2,734.9	$	833.2	$	(1,222.1	)	$	3,470.1
Liabilities and Equity
Total current liabilities	$	—	$	736.6	$	174.3	$	—		$	910.9
Long-term debt	—		1,053.6		34.7		—			1,088.3
Advances from consolidated affiliates, net	—		23.8		—		(23.8		)	—
Other liabilities	—		190.8		151.2		—			342.0
Total liabilities	$	—	$	2,004.8	$	360.2	$	(23.8	)	$	2,341.2
Total equity	$	1,124.1	$	730.1	$	473.0	$	(1,198.3	)	$	1,128.9
Total liabilities and equity	$	1,124.1	$	2,734.9	$	833.2	$	(1,222.1	)	$	3,470.1



As of December 31, 2013:	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Current assets, including discontinued operations	$	—	$	1,156.7	$	150.3	$	—		$	1,307.0
Property and equipment, net	—		420.2		67.9		—			488.1
Goodwill and other intangible assets, net	—		932.8		134.9		—			1,067.7
Investments in and advances to consolidated affiliates, net	1,006.8		170.8		—		(1,177.6		)	—
Other long-term assets, including discontinued operations	9.3		36.2		14.9		—			60.4
Total assets	$	1,016.1	$	2,716.7	$	368.0	$	(1,177.6	)	$	2,923.2
Liabilities and Equity
Total current liabilities	$	—	$	773.3	$	55.9	$	—		$	829.2
Long-term debt	—		760.9		4.5		—			765.4
Advances from consolidated affiliates, net	—		—		22.5		(22.5		)	—
Other liabilities	—		236.4		71.1		—			307.5
Total liabilities	$	—	$	1,770.6	$	154.0	$	(22.5	)	$	1,902.1
Total equity	$	1,016.1	$	946.1	$	214.0	$	(1,155.1	)	$	1,021.1
Total liabilities and equity	$	1,016.1	$	2,716.7	$	368.0	$	(1,177.6	)	$	2,923.2

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF CASH FLOWS (in millions)



For the Nine Months Ended September 30, 2014:	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(1.1	)	$	39.6		$	42.5		$	—	$	81.0
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	—			(39.9		)	(123.0		)	—		(162.9		)
Capital expenditures	—			(75.6		)	(15.4		)	—		(91.0		)
Proceeds from sale of property and equipment	—			10.3			1.9			—		12.2
Payments for other investments, net	—			(1.0		)	—			—		(1.0		)
Net cash used in investing activities	$	—		$	(106.2	)	$	(136.5	)	$	—	$	(242.7	)
Cash flows provided by (used in) financing activities:
Proceeds from credit facility	—			1,122.4			197.2			—		1,319.6
Repayments of credit facility	—			(723.2		)	(232.0		)	—		(955.2		)
Repayments of senior convertible notes	—			(105.3		)	—			—		(105.3		)
Repayments of other borrowings and capital lease obligations	—			(45.3		)	(8.8		)	—		(54.1		)
Excess tax benefits and net proceeds from stock-based awards	2.9			0.9			—			—		3.8
Payments of acquisition-related contingent consideration	—			(60.3		)	—			—		(60.3		)
Payments of financing costs	—			(1.5		)	—			—		(1.5		)
Net financing activities and advances (to) from consolidated affiliates	(1.8		)	(124.1		)	125.9			—		—
Net cash provided by financing activities	$	1.1		$	63.6		$	82.3		$	—	$	147.0
Effect of currency translation on cash	—			—			(1.2		)	—		(1.2		)
Net decrease in cash and cash equivalents	$	—		$	(3.0	)	$	(12.9	)	$	—	$	(15.9	)
Cash and cash equivalents - beginning of period	—			5.3			17.7			—		23.0
Cash and cash equivalents - end of period	$	—		$	2.3		$	4.8		$	—	$	7.1



For the Nine Months Ended September 30, 2013:	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(2.4	)	$	103.2		$	28.5		$	—	$	129.3
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	—			(43.0		)	(103.6		)	—		(146.6		)
Capital expenditures	—			(96.8		)	(4.6		)	—		(101.4		)
Proceeds from sale of property and equipment	—			7.6			0.7			—		8.3
Proceeds from disposal of business, net of cash divested	$	—		$	(4.3	)	$	—		$	—	$	(4.3	)
Proceeds from other investments, net	$	—		$	3.8		$	—		$	—	$	3.8
Net cash used in investing activities	$	—		$	(132.7	)	$	(107.5	)	$	—	$	(240.2	)
Cash flows provided by (used in) financing activities:
Proceeds from credit facility	$	—		$	639.6		$	126.6		$	—	$	766.2
Repayments of credit facility	—			(737.2		)	(123.0		)	—		(860.2		)
Proceeds from senior notes, net	—			250.0			—			—		250.0
Repayments of other borrowings and capital lease obligations	—			(55.5		)	(1.0		)	—		(56.5		)
Excess tax benefits and net proceeds from stock-based awards	9.2			3.0			—			—		12.2
Payments of acquisition-related contingent consideration	—			(12.8		)	—			—		(12.8		)
Payments of financing costs, including call premiums on extinguishment of debt	—			(11.8		)	—			—		(11.8		)
Net financing activities and advances (to) from consolidated affiliates	(6.8		)	(56.4		)	63.2			—		—
Net cash provided by financing activities	$	2.4		$	18.9		$	65.8		$	—	$	87.1
Effect of currency translation on cash	—			—			(0.1		)	—		(0.1		)
Net decrease in cash and cash equivalents	$	—		$	(10.6	)	$	(13.3	)	$	—	$	(23.9	)
Cash and cash equivalents - beginning of period	—			12.7			14.0			—		26.7
Cash and cash equivalents - end of period	$	—		$	2.1		$	0.7		$	—	$	2.8

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2014
Subsequent Events [Abstract]
Subsequent Events	Note 19 - Subsequent Events Effective October 1, 2014, the Company acquired all of the issued and outstanding equity interests of WesTower Communications Inc., a Delaware corporation (“WesTower”), for approximately $199 million in cash, subject to customary purchase price adjustments. WesTower is a telecommunications services firm, focusing on construction and maintenance of communications infrastructure related to wireless networks throughout the United States. WesTower currently provides services to a number of major wireless carriers through regional operating offices located throughout the Eastern, Central and Western United States. WesTower will be included in the Company’s Communications segment. Due to the limited amount of time since the acquisition of WesTower, the initial accounting for the acquisition is incomplete. The Company will complete an initial allocation of purchase price to total net assets acquired for the WesTower acquisition in the fourth quarter of 2014 and include the related disclosures in the Company’s consolidated financial statements for the year ended December 31, 2014. In connection with the WesTower acquisition, the Company amended its Credit Facility in October 2014. The amendment used a portion of the Credit Facility's $250 million accordion feature to make available an additional $75 million term loan (the "Term Loan"), which increased aggregate borrowing commitments to $1.075 billion. The interest, maturity and other provisions of the Term Loan are substantially identical to those of all other loans under the Credit Facility. For additional information regarding loan provisions under the Credit Facility, see Note 9 - Debt in the notes to the Company's consolidated financial statements included in its Annual Report on Form 10-K for the year ended December 31, 2013.

Business, Basis of Presentation and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]
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: petroleum and natural gas pipeline infrastructure; wireless, wireline/fiber and satellite communications; electrical utility transmission and distribution; power generation; and industrial infrastructure. MasTec’s customers are in these industries. MasTec reports its results in five reportable segments: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (4) Power Generation and Industrial; and (5) Other. See Note 15 - Segments and Related Information.
Basis of Presentation	Basis of Presentation The accompanying condensed unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions for Form 10-Q and Rule 10-01 of Regulation S-X. Pursuant to these rules and regulations, certain information and footnote disclosures normally included in the annual consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The accompanying condensed consolidated balance sheet as of December 31, 2013 is derived from the Company’s audited financial statements as of that date. Because certain information and footnote disclosures have been condensed or omitted, these condensed unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto as of and for the year ended December 31, 2013 contained in the Company’s most recent Annual Report on Form 10-K. In management’s opinion, all normal and recurring adjustments considered necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented have been included. Certain prior year amounts have been reclassified to conform to the current period presentation. Interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full fiscal year. The Company believes that the disclosures made in these condensed unaudited consolidated financial statements are adequate to make the information not misleading.
Reclassifications	Certain prior year amounts have been reclassified to conform to the current period presentation.
Principles of Consolidation	Principles of Consolidation The accompanying condensed unaudited 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 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 condensed unaudited consolidated balance sheets. Income or loss from these investments is recorded in other income or expense, net, in the condensed unaudited consolidated statements of operations. The Company's investments in entities in which the Company does not have the ability to exert significant influence are accounted for using the cost method of accounting. All significant intercompany balances and transactions have been eliminated in consolidation. 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 or loss. Revenue and expenses are translated into U.S. dollars at average rates of exchange prevailing during the applicable 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. The results of operations and financial position of any discontinued operations are aggregated and presented separately from the Company's continuing operations in the condensed unaudited consolidated financial statements for all periods presented.
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 or loss. Revenue and expenses are translated into U.S. dollars at average rates of exchange prevailing during the applicable 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.
Investments in Affiliates and Other Entities	Investments in Affiliates and Other Entities In the ordinary course of business, the Company enters into various investment arrangements, which may include equity or other interests in business entities, including contractual joint ventures or other forms of equity participation. These investment arrangements may also include certain forms of financing, such as the extension of loans. In connection with certain of these investment arrangements, the Company provides infrastructure construction services to or through its equity investees and/or contractual joint ventures. Management determines whether such investment arrangements involve a variable interest entity (“VIE”) based on the characteristics of the particular entity. If an entity is determined to be a VIE, then management determines if the Company is the primary beneficiary of the entity and whether or not consolidation of the VIE within the Company's financial statements is required. The primary beneficiary consolidating the VIE must normally have both (i) the power to direct the activities of a VIE that most significantly affect the VIE’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE, which, in either case, could be significant to the VIE. If management determines that the Company is the primary beneficiary of a VIE, then the VIE would be consolidated, and the other party’s equity interest in the VIE would be accounted for as a non-controlling interest. As of September 30, 2014, the Company was not the primary beneficiary of any VIE. In cases where the Company has an undivided interest in the assets, liabilities, revenues and profits of an unincorporated entity, such amounts are consolidated on a basis proportional to the Company’s ownership interest in the unincorporated entity.
Variable Interest Entities	In the ordinary course of business, the Company enters into various investment arrangements, which may include equity or other interests in business entities, including contractual joint ventures or other forms of equity participation. These investment arrangements may also include certain forms of financing, such as the extension of loans. In connection with certain of these investment arrangements, the Company provides infrastructure construction services to or through its equity investees and/or contractual joint ventures. Management determines whether such investment arrangements involve a variable interest entity (“VIE”) based on the characteristics of the particular entity. If an entity is determined to be a VIE, then management determines if the Company is the primary beneficiary of the entity and whether or not consolidation of the VIE within the Company's financial statements is required. The primary beneficiary consolidating the VIE must normally have both (i) the power to direct the activities of a VIE that most significantly affect the VIE’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE, which, in either case, could be significant to the VIE. If management determines that the Company is the primary beneficiary of a VIE, then the VIE would be consolidated, and the other party’s equity interest in the VIE would be accounted for as a non-controlling interest.
Unincorporated Joint Ventures, Proportionate Consolidation	In cases where the Company has an undivided interest in the assets, liabilities, revenues and profits of an unincorporated entity, such amounts are consolidated on a basis proportional to the Company’s ownership interest in the unincorporated entity.
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 and gross profit or loss, in particular, on long-term construction contracts, which rely upon estimates of costs to complete projects, ultimate project gross profit and the amount of contract price adjustments that are probable; allowances for doubtful accounts; accrued self-insured claims; estimated fair values of goodwill and intangible assets, acquisition-related contingent consideration, convertible debt obligations and investments in cost and equity method investees; asset lives used in computing depreciation and amortization, including amortization of intangible assets; share-based compensation; 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 condensed unaudited consolidated financial statements.
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. Revenue and related costs for master and other service agreements billed on a time and materials basis are recognized as the services are rendered. The Company also performs services under master and other service agreements on a fixed fee basis, under which MasTec furnishes specified units of service for a fixed price per unit of service and revenue is recognized as the services are rendered. Revenues from fixed price contracts provide for a fixed amount of revenue for the entire project, subject to certain additions for changed scope or specifications. Revenues from these contracts are recognized using the percentage-of-completion method. Under this method, the percentage of revenue to be recognized for a given project is measured by the percentage of costs incurred to date on the contract to the total estimated costs for the contract. Such contracts provide that the customer accept completion of progress to date and compensate the Company for services rendered, which may be measured in terms of costs incurred, units installed, hours expended or some other measure of progress. 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. As of September 30, 2014 and December 31, 2013, the Company had approximately $78 million and $79 million, respectively, of change orders and/or claims that had been included as contract price adjustments on certain contracts that were in the process of being resolved in the normal course of business, including through negotiation, in arbitration and other proceedings. These contract price adjustments represent management's best estimate of additional contract revenues that have been or will be earned and that management believes are probable of collection. The amounts ultimately realized upon final acceptance by its customers could be higher or lower than such estimated amounts, which are primarily expected to be billed and collected within one year.
New Accounting Pronouncements	New Accounting Pronouncements Accounting Standards Not Yet Adopted In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606). The core principle of this ASU is that a company will recognize revenue when it transfers goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under current guidance and will be required to disclose information about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including disclosure of assumptions and estimates where significant judgment has been applied. ASU 2014-09 is effective using either the retrospective or cumulative effect transition method for fiscal years, and interim periods within those years, beginning after December 15, 2016. Early application is not permitted. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements. In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity (“ASU 2014-08”). ASU 2014-08 changes the requirements for reporting discontinued operations and requires additional disclosures about discontinued operations. Only disposals of components of an entity representing a strategic shift that has, or will have, a major effect on an entity’s operations and financial results should be reported as discontinued operations under ASU 2014-08. Examples include a disposal of a major geographical area, a major line of business, or a major equity method investment. ASU 2014-08 also requires expanded disclosures about discontinued operations and requires disclosures about individually significant dispositions that do not qualify as discontinued operations. ASU 2014-08 is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2014. Early adoption is permitted only for disposals that have not been previously reported. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements. Recently Adopted Accounting Pronouncements In July 2013, the FASB issued ASU 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the FASB Emerging Issues Task Force) (“ASU 2013-11”). ASU 2013-11 provides guidance on the presentation in the financial statements of an unrecognized tax benefit, or a portion of an unrecognized tax benefit, and explains that unrecognized tax benefits should be presented as a reduction to deferred tax assets for net operating loss carryforwards, similar tax losses or tax credit carryforwards. To the extent a net operating loss carryforward, similar tax loss or tax credit carryforward is not available as of the reporting date under the tax law of the applicable jurisdiction, or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. ASU 2013-11 applies to all entities that have unrecognized tax benefits when a net operating loss carryforward, similar tax loss, or tax credit carryforward exists as of the reporting date. ASU 2013-11 is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. Retrospective application is permitted. The Company adopted ASU 2013-11 as of January 1, 2014. The adoption of this ASU did not have a material impact on the condensed unaudited consolidated financial statements.

Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2014

Earnings Per Share [Line Items]

Schedule of Earnings Per Share Information

The following table provides details underlying the Company’s earnings per share calculations for the periods indicated (in thousands):



	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2014			2013			2014			2013
Net income attributable to MasTec:
Net income, continuing operations - basic ^(a)	$	45,591		$	49,960		$	93,936		$	104,702
Interest expense, net of tax, 2009 Convertible Notes	20			79			166			236
Net income, continuing operations - diluted	$	45,611		$	50,039		$	94,102		$	104,938
Net loss from discontinued operations - basic and diluted ^(a)	(320		)	(3,822		)	(592		)	(5,253		)
Net income attributable to MasTec - diluted	$	45,291		$	46,217		$	93,510		$	99,685
Weighted average shares outstanding:
Weighted average shares outstanding - basic	81,811			77,093			79,158			76,816
Dilutive common stock equivalents	814			775			798			774
Dilutive premium shares, 2011 Convertible Notes	3,005			6,790			5,900			6,337
Dilutive shares, 2009 Convertible Notes	194			806			560			806
Weighted average shares outstanding - diluted	85,824			85,464			86,416			84,733


(a)	Calculated as total net income (loss) less amounts attributable to non-controlling interests.

2011 Convertible Notes [Member]

Earnings Per Share [Line Items]

Schedule of Convertible Note Premium Share Information

The calculations 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 Three Months Ended September 30,							As of and for the Nine Months Ended September 30,
	2014			2013				2014			2013
Premium Share Information:		2011 4.25% Notes		2011 4.0% Notes		2011 4.25% Notes			2011 4.25% Notes		2011 4.0% Notes		2011 4.25% Notes
Number of conversion shares, principal amount		6,268		6,683		6,268			6,268		6,683		6,268
Per share price, actual average		$	29.73	$	32.84	$	32.84		$	35.06	$	30.59	$	30.59
Premium value		$	89,341	$	114,176	$	108,864		$	122,748	$	99,104	$	94,728
Premium shares		3,005		3,476		3,314			3,501		3,240		3,097

Acquisitions (Tables)

9 Months Ended

Sep. 30, 2014

Schedule of Pro Forma Information, Business Acquisitions



	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2014		2013		2014		2013
Pro forma financial information:	(unaudited, in millions)				(unaudited, in millions)
Revenue	$	1,309.6	$	1,417.5	$	3,496.0	$	3,667.3
Net income from continuing operations	$	46.0	$	52.4	$	96.5	$	118.0

Results of Businesses Acquired



	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2014		2013		2014		2013
Actual of acquiree (year over year impact):	(unaudited, in millions)				(unaudited, in millions)
Revenue	$	133.2	$	141.6	$	342.5	$	270.4
Net income from continuing operations ^(a)	$	2.3	$	7.5	$	4.5	$	12.8

(a)

Pacer [Member]

Schedule of Consideration Paid and Net Assets Acquired, Business Acquisitions



Acquisition consideration:	June 1, 2014
Cash	$	126.5
Fair value of contingent consideration (earn-out liability)	25.7
Total consideration transferred	$	152.2
Identifiable assets acquired and liabilities assumed:
Current assets	$	118.4
Equity method investments	2.3
Other long-term assets	0.1
Property and equipment	72.8
Pre-qualifications	41.2
Finite-lived intangible assets	20.3
Current liabilities	(55.8		)
Long-term debt	(87.0		)
Deferred income taxes	(29.6		)
Total identifiable net assets	$	82.7
Goodwill	$	69.5
Total net assets acquired, including goodwill	$	152.2

Schedule of Finite-Lived Intangible Assets Acquired, Business Acquisitions

The fair values and weighted average useful lives of Pacer's acquired finite-lived intangible assets, as adjusted, as of the date of acquisition were assigned as follows:



	Fair Value		Weighted Average Useful Life
Finite-lived intangible assets:	(in millions)		(in years)
Backlog	$	6.1	2
Non-compete agreements	2.3		8
Customer relationships	11.9		8
Total acquired finite-lived intangible assets	$	20.3	6

2013 Acquisitions [Member]

Schedule of Measurement Period Adjustments, Business Acquisitions

Measurement period adjustments associated with the Company's 2013 acquisitions have been reflected as follows (in millions):



As of December 31, 2013:	As Previously Reported		Measurement Period Adjustments			As Revised
Current assets	$	1,306.0	$	1.0		$	1,307.0
Goodwill	$	899.4	$	2.6		$	902.0
Current liabilities	$	825.5	$	3.7		$	829.2
Long-term deferred tax liabilities, net	$	154.9	$	(0.1	)	$	154.8

Tabular disclosure of the change in an accounting estimate, including a change that occurs in an interim period. If a change in accounting estimate affects several future periods (for example, a change in the service life of a depreciable asset) disclose the effect on income from continuing operations, net income (or other appropriate captions of changes in the applicable net assets or performance indicator), and any related per-share amounts of the current period. Disclosure of the effects of a change in an accounting estimate that occurs in the ordinary course of business (such as uncollectible accounts or inventory obsolescence) is not required, unless the effect is material.

Discontinued Operations Disclosures [Line Items]

Discontinued Operations (Tables)

9 Months Ended

Sep. 30, 2014

Globetec [Member]

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



	September 30, 2014		December 31, 2013
Current assets	$	5.0	$	2.3
Long-term assets	7.1		10.1
Assets of discontinued operations	$	12.1	$	12.4
Current liabilities of discontinued operations	$	1.2	$	1.2

The following table presents Globetec's results from discontinued operations for the periods indicated (in millions):



	For the Three Months Ended September 30, 2013			For the Nine Months Ended September 30, 2013
Revenue	$	4.8		$	18.0
Loss from operations, before tax	(0.5		)	(2.7		)
Impairment of assets, before tax	(5.7		)	(6.0		)
Income tax benefit	2.5			3.5
Net loss from discontinued operations	$	(3.7	)	$	(5.2	)

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)

9 Months Ended

Sep. 30, 2014

Rollforward of Goodwill by Segment

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



	Communications		Oil and Gas			Electrical Transmission		Power Generation and Industrial		Total Goodwill
Balance as of December 31, 2013	$	326.8	$	307.7		$	149.9	$	117.6	$	902.0
Additions from new business combinations	28.6		69.5			—		—		98.1
Accruals of acquisition-related contingent consideration, net ^(a)	4.6		—			—		—		4.6
Currency translation adjustments	—		(4.7		)	—		—		(4.7		)
Balance as of September 30, 2014	$	360.0	$	372.5		$	149.9	$	117.6	$	1,000.0


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

Rollforward of Other Intangible Assets

The following table provides a reconciliation of changes in other intangible assets (in millions):



	Other Intangible Assets
	Non-amortizing					Amortizing
	Trade Names		Pre-Qualifications			Customer Relationships and Backlog			Other ^(a)			Total
Gross carrying amount as of December 31, 2013	$	34.8	$	59.4		$	128.4		$	22.5		$	245.1
Accumulated amortization						$	(67.7	)	$	(11.8	)	$	(79.5	)
Other intangible assets, net, as of December 31, 2013	$	34.8	$	59.4		$	60.7		$	10.7		$	165.6
Additions from new business combinations	—		41.2			33.1			2.7			77.0
Amortization expense						(15.7		)	(1.3		)	(17.0		)
Currency translation adjustments	—		(2.6		)	(0.8		)	—			(3.4		)
Other intangible assets, net, as of September 30, 2014	$	34.8	$	98.0		$	77.3		$	12.1		$	222.2


(a)	Consists principally of amortizing trade names and non-compete agreements.

Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Schedule of Fair Values of Selected Financial Instruments Measured On A Non-Recurring Basis

Carrying amounts and estimated fair values of selected financial instruments measured on a non-recurring basis as of the dates indicated were as follows (in millions):



	September 30, 2014				December 31, 2013
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
4.875% Senior Notes	$	400.0	$	377.0	$	400.0	$	380.0
2009 Convertible Notes	$	3.0	$	5.9	$	12.6	$	26.6
2011 Convertible Notes	$	97.0	$	192.1	$	198.3	$	428.3

Accounts Receivable, Net of Allowance (Tables)

9 Months Ended

Sep. 30, 2014

Accounts Receivable [Member]

Schedule of Accounts Receivable, Net of Allowance [Line Items]

Schedule Of Accounts Receivable, Net of Allowance

The following table provides details of accounts receivable, net of allowance, as of the dates indicated (in millions):



	September 30, 2014			December 31, 2013
Contract billings	$	775.6		$	606.5
Retainage	179.3			159.3
Costs and earnings in excess of billings	451.7			384.6
Accounts receivable, gross	$	1,406.6		$	1,150.4
Less allowance for doubtful accounts	(16.7		)	(15.7		)
Accounts receivable, net	$	1,389.9		$	1,134.7

Property and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2014

Property, Plant and Equipment [Abstract]

Schedule of Property And Equipment, Net

The following table provides details of property and equipment, net, including property and equipment held under capital leases as of the dates indicated (in millions):



	September 30, 2014			December 31, 2013
Land	$	4.6		$	4.8
Buildings and leasehold improvements	19.2			18.0
Machinery and equipment	901.6			727.1
Office furniture and equipment	118.1			102.5
Construction in progress	17.2			11.0
Total property and equipment	$	1,060.7		$	863.4
Less accumulated depreciation and amortization	(446.3		)	(375.3		)
Property and equipment, net	$	614.4		$	488.1

Debt (Tables)

9 Months Ended

Sep. 30, 2014

Debt Disclosure [Abstract]

Schedule of Carrying Values of Long-Term Debt

The following table provides details of the carrying values of long-term debt as of the dates indicated (in millions):



Description	Maturity Date	September 30, 2014			December 31, 2013
Senior secured credit facility	October 29, 2018	$	449.5		$	53.0
4.875% senior notes	March 15, 2023	400.0			400.0
2011 4.0% senior convertible notes	June 15, 2014	—			103.8
2011 4.25% senior convertible notes	December 15, 2014	96.4			94.5
2009 4.0% senior convertible notes	June 15, 2014	—			9.6
2009 4.25% senior convertible notes	December 15, 2014	3.0			3.0
Other credit facilities	Varies	4.8			—
Capital lease obligations, weighted average interest rate of 2.8%	In installments through June 13, 2021	163.6			126.0
Notes payable, equipment, weighted average interest rate of 2.9%	In installments through September 1, 2018	42.8			26.9
Total debt		$	1,160.1		$	816.8
Less current maturities		(71.8		)	(51.4		)
Long-term debt		$	1,088.3		$	765.4

Schedule of Interest Expense, Net

The following table provides details of interest expense, net, for the periods indicated (in millions):



	For the Three Months Ended September 30,					For the Nine Months Ended September 30,
	2014			2013		2014			2013
Interest expense:
Contractual and other interest expense	$	11.3		$	10.4	$	31.6		$	27.9
Accretion of senior convertible note discount	0.6			1.3		3.4			3.9
Amortization of deferred financing costs	0.8			1.0		2.7			3.0
Total interest expense	$	12.7		$	12.7	$	37.7		$	34.8
Interest income	(0.1		)	—		(0.1		)	(0.3		)
Interest expense, net	$	12.6		$	12.7	$	37.6		$	34.5

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 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 3: 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 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=26873400&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=34725769&loc=d3e28878-108400

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

Reference 8: 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 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

Summary of Activity, Restricted Share Awards

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

9 Months Ended

Sep. 30, 2014

Share-based Compensation [Abstract]



Activity, restricted share awards:	Restricted Shares		Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2013	1,123,545		$	23.78
Granted	323,249		41.05
Vested	(181,195	)	20.26
Canceled/forfeited	(22,442	)	17.38
Non-vested restricted shares, as of September 30, 2014	1,243,157		$	28.90

Summary of Activity, Stock Options



Activity, stock options:	Stock Options		Per Share Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value ^(a) (in millions)
Options outstanding as of December 31, 2013	495,571		$	11.17	1.96	$	10.7
Exercised	(210,900	)	9.97
Canceled/forfeited	—		—
Options outstanding as of September 30, 2014	284,671		$	12.06	1.54	$	5.3
Options exercisable as of September 30, 2014	284,671		$	12.06	1.54	$	5.3


(a)	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 Activity, Employee Stock Purchase Plan



	Nine Months Ended September 30,
Activity, employee stock purchase plan:	2014		2013
Cash proceeds (in millions)	$	2.5	$	6.0
Common shares issued	94,761		436,925
Weighted average per share price	$	26.60	$	13.69
Weighted average per share grant date fair value	$	6.34	$	5.55

Summary of Stock-Based Compensation Expense And Related Tax Benefits



	Three Months Ended September 30,				Nine Months Ended September 30,
	2014		2013		2014		2013
Stock-based compensation expense	$	4.1	$	3.0	$	11.6	$	9.6
Income Tax Effects:
Income tax benefit from stock-based compensation	$	1.8	$	4.5	$	8.4	$	7.7
Excess tax benefit from stock-based compensation ^(a)	$	0.1	$	3.0	$	3.5	$	4.4


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

Other Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2014

Multiemployer Plans [Abstract]

Schedule of Covered Employees and Contributions, Multi-Employer Plans

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



	Multi-Employer Plans
	Covered Employees		Contributions (in millions)
For the Three Months Ended September 30:	Low	High	Pension		Post-Retirement Benefit		Total
2014	2,029	2,167	$	11.6	$	1.1	$	12.7
2013	2,392	2,734	$	14.9	$	1.0	$	15.9
For the Nine Months Ended September 30:	Low	High	Pension		Post-Retirement Benefit		Total
2014	1,098	2,167	$	27.3	$	2.5	$	29.8
2013	778	2,734	$	30.2	$	3.0	$	33.2

Equity (Tables)

9 Months Ended

Sep. 30, 2014

Equity [Abstract]

Schedule of Share Activity



Share Activity (in thousands):	Common Shares Outstanding		Treasury Shares
Balance as of December 31, 2013	77,258		9,467
Shares issued:
Stock option exercises	211
Restricted share awards	181
Convertible notes	4,204		(4,204	)
Other, net	(11	)
Balance as of September 30, 2014	81,843		5,263

Schedule of Changes in Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive loss by component during the periods indicated are as follows (in thousands):



	For the Nine Months Ended September 30,
	2014									2013
	Unrealized (Losses) Gains
	Foreign Currency			Other			Total			Foreign Currency			Other			Total
Balance as of January 1	$	(7,998	)	$	(5,288	)	$	(13,286	)	$	(106	)	$	(5,395	)	$	(5,501	)
Activity before reclassifications, net of tax	(10,601		)	—			(10,601		)	(3,839		)	(118		)	(3,957		)
Reclassifications, net of tax	—			—			—			—			(440		)	(440		)
Activity, net of tax	(10,601		)	—			(10,601		)	(3,839		)	(558		)	(4,397		)
Balance as of September 30	$	(18,599	)	$	(5,288	)	$	(23,887	)	$	(3,945	)	$	(5,953	)	$	(9,898	)

Segments and Related Information (Tables)

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Schedule of Financial Information by Reportable Segment



	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
Revenue:	2014			2013			2014			2013
Communications ^(a)	$	505.2		$	543.0		$	1,480.4		$	1,464.5
Oil and Gas	557.4			519.1			1,302.9			1,134.8
Electrical Transmission	132.6			118.8			327.2			321.9
Power Generation and Industrial	114.3			85.1			263.1			237.3
Other	1.1			3.5			6.5			9.2
Eliminations	(1.0		)	(0.1		)	(1.9		)	(2.0		)
Consolidated revenue	$	1,309.6		$	1,269.4		$	3,378.2		$	3,165.7


(a)	Revenue generated by utilities customers represented 7.6% and 6.9% of Communications segment revenue for the three month periods ended September 30, 2014 and 2013, respectively, and 7.0% and 7.2% of Communications segment revenue for the nine month periods ended September 30, 2014 and 2013, respectively.



	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
EBITDA:	2014			2013			2014			2013
Communications	$	52.4		$	71.8		$	153.7		$	181.6
Oil and Gas	73.0			68.1			143.5			161.7
Electrical Transmission	12.7			12.1			33.2			27.0
Power Generation and Industrial	4.9			(6.4		)	9.4			(14.6		)
Other	(0.3		)	0.1			0.1			0.5
Corporate	(14.5		)	(13.6		)	(38.7		)	(47.9		)
Consolidated EBITDA	$	128.2		$	132.1		$	301.2		$	308.3



	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
Depreciation and Amortization:	2014		2013		2014		2013
Communications	$	10.1	$	9.5	$	30.1	$	26.8
Oil and Gas	23.3		22.5		61.3		60.1
Electrical Transmission	5.2		3.2		11.9		8.4
Power Generation and Industrial	1.7		1.7		4.8		5.1
Corporate	1.4		0.9		3.9		2.7
Consolidated Depreciation and Amortization	$	41.7	$	37.8	$	112.0	$	103.1

Reconciliation of EBITDA to Consolidated Income from Continuing Operations before Income Taxes

The following table presents a reconciliation of EBITDA to consolidated income from continuing operations before income taxes (in millions):



	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
EBITDA Reconciliation:	2014			2013			2014			2013
EBITDA	$	128.2		$	132.1		$	301.2		$	308.3
Less:
Interest expense, net	(12.6		)	(12.7		)	(37.6		)	(34.5		)
Depreciation and amortization	(41.7		)	(37.8		)	(112.0		)	(103.1		)
Income from continuing operations before income taxes	$	73.8		$	81.6		$	151.7		$	170.6

Schedule of Significant Customers, Revenue Concentration Information

Revenue concentration information for significant customers as a percentage of total consolidated revenue was as follows:



	For the Three Months Ended September 30,		For the Nine Months Ended September 30,
	2014	2013	2014	2013
Customer:
AT&T ^(a)	16%	16%	21%	18%
DIRECTV^{® (b)}	12%	13%	13%	15%
Enbridge, Inc. ^(c)	10%	20%	10%	14%


(a)	The Company's relationship with AT&T is based upon master service agreements, other service agreements and construction/installation contracts for AT&T's wireless, wireline/fiber and home security and automation businesses. Revenue from AT&T is included in the Communications segment.


(b)	The Company's relationship with DIRECTV® is based upon an agreement to provide installation and maintenance services for DIRECTV®. Revenue from DIRECTV® is included in the Communications segment.


(c)	The Company's relationship with Enbridge, Inc. is based upon various construction contracts for natural gas pipelines. Revenue from Enbridge, Inc. is included in the Oil and Gas segment.

Supplemental Guarantor Condensed Unaudited Consolidating Financial Information (Tables)

9 Months Ended

Sep. 30, 2014

Condensed Unaudited Financial Statements, Supplemental Guarantor Information [Abstract]

Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (in millions)



For the Three Months Ended September 30, 2014:	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	1,043.1		$	268.5		$	(2.0	)	$	1,309.6
Costs of revenue, excluding depreciation and amortization	—			892.6			232.4			(2.0		)	1,123.0
Depreciation and amortization	—			30.8			10.9			—			41.7
General and administrative expenses	0.6			50.8			8.5			—			59.9
Interest expense, net	—			11.5			1.1			—			12.6
Other (income) expense, net	—			(1.6		)	0.2			—			(1.4		)
(Loss) income from continuing operations before income taxes	$	(0.6	)	$	59.0		$	15.4		$	—		$	73.8
Benefit from (provision for) income taxes	0.2			(22.0		)	(6.2		)	—			(28.0		)
Net (loss) income from continuing operations	$	(0.4	)	$	37.0		$	9.2		$	—		$	45.7
Net loss from discontinued operations	—			—			(0.3		)	—			(0.3		)
Equity in income from subsidiaries, net of tax	45.7			—			—			(45.7		)	—
Net income (loss)	$	45.3		$	37.0		$	8.9		$	(45.7	)	$	45.4
Net income attributable to non-controlling interests	—			—			0.1			—			0.1
Net income (loss) attributable to MasTec, Inc.	$	45.3		$	37.0		$	8.8		$	(45.7	)	$	45.3
Comprehensive income (loss)	$	32.3		$	37.0		$	(4.1	)	$	(32.7	)	$	32.5



For the Three Months Ended September 30, 2013:	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	1,140.9		$	129.0		$	(0.5	)	$	1,269.4
Costs of revenue, excluding depreciation and amortization	—			969.5			112.1			(0.5		)	1,081.1
Depreciation and amortization	—			31.6			6.2			—			37.8
General and administrative expenses	0.5			50.1			8.4			—			59.0
Interest expense, net	—			12.0			0.7			—			12.7
Other income, net	—			(2.3		)	(0.5		)	—			(2.8		)
(Loss) income from continuing operations before income taxes	$	(0.5	)	$	80.0		$	2.1		$	—		$	81.6
Benefit from (provision for) income taxes	0.2			(31.5		)	(0.4		)	—			(31.7		)
Net (loss) income from continuing operations	$	(0.3	)	$	48.5		$	1.7		$	—		$	49.9
Net loss from discontinued operations	—			—			(3.7		)	—			(3.7		)
Equity in income from subsidiaries, net of tax	46.4			—			—			(46.4		)	—
Net income (loss)	$	46.1		$	48.5		$	(2.0	)	$	(46.4	)	$	46.2
Net income attributable to non-controlling interests	—			—			0.1			—			0.1
Net income (loss) attributable to MasTec, Inc.	$	46.1		$	48.5		$	(2.1	)	$	(46.4	)	$	46.1
Comprehensive income (loss)	$	49.0		$	48.5		$	0.8		$	(49.3	)	$	49.0

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (in millions)



For the Nine Months Ended September 30, 2014:	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	2,798.6		$	581.7		$	(2.1	)	$	3,378.2
Costs of revenue, excluding depreciation and amortization	—			2,402.0			515.0			(2.1		)	2,914.9
Depreciation and amortization	—			88.4			23.6			—			112.0
General and administrative expenses	1.8			146.6			19.1			—			167.5
Interest expense, net	—			35.6			2.0			—			37.6
Other (income) expense, net	—			(5.8		)	0.3			—			(5.5		)
(Loss) income from continuing operations before income taxes	$	(1.8	)	$	131.8		$	21.7		$	—		$	151.7
Benefit from (provision for) income taxes	0.7			(51.2		)	(7.2		)	—			(57.7		)
Net (loss) income from continuing operations	$	(1.1	)	$	80.6		$	14.5		$	—		$	94.0
Net loss from discontinued operations	—			—			(0.6		)	—			(0.6		)
Equity in income from subsidiaries, net of tax	94.5			—			—			(94.5		)	—
Net income (loss)	$	93.4		$	80.6		$	13.9		$	(94.5	)	$	93.4
Net income attributable to non-controlling interests	—			—			—			—			—
Net income (loss) attributable to MasTec, Inc.	$	93.4		$	80.6		$	13.8		$	(94.5	)	$	93.3
Comprehensive income (loss)	$	82.8		$	80.5		$	3.4		$	(83.9	)	$	82.8



For the Nine Months Ended September 30, 2013:	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	2,881.1		$	289.0		$	(4.4	)	$	3,165.7
Costs of revenue, excluding depreciation and amortization	—			2,447.7			252.0			(4.4		)	2,695.3
Depreciation and amortization	—			88.8			14.3			—			103.1
General and administrative expenses	1.4			138.5			19.9			—			159.8
Interest expense, net	—			33.5			1.0			—			34.5
Loss on extinguishment of debt	—			5.6			—			—			5.6
Other income, net	—			(2.4		)	(0.8		)	—			(3.2		)
(Loss) income from continuing operations before income taxes	$	(1.4	)	$	169.4		$	2.6		$	—		$	170.6
Benefit from (provision for) income taxes	0.6			(66.0		)	(0.4		)	—			(65.8		)
Net (loss) income from continuing operations	$	(0.8	)	$	103.4		$	2.2		$	—		$	104.8
Net loss from discontinued operations	—			—			(5.2		)	—			(5.2		)
Equity in income from subsidiaries, net of tax	100.3			—			—			(100.3		)	—
Net income (loss)	$	99.5		$	103.4		$	(3.0	)	$	(100.3	)	$	99.6
Net income attributable to non-controlling interests	—			—			0.2			—			0.2
Net income (loss) attributable to MasTec, Inc.	$	99.5		$	103.4		$	(3.2	)	$	(100.3	)	$	99.4
Comprehensive income (loss)	$	95.1		$	102.8		$	(6.8	)	$	(95.9	)	$	95.2

Condensed Unaudited Consolidating Balance Sheets

CONDENSED UNAUDITED CONSOLIDATING BALANCE SHEETS (in millions)



As of September 30, 2014:	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Current assets, including discontinued operations	$	—	$	1,251.5	$	322.5	$	—		$	1,574.0
Property and equipment, net	—		475.5		138.9		—			614.4
Goodwill and other intangible assets, net	—		972.6		249.5		—			1,222.1
Investments in and advances to consolidated affiliates, net	1,114.8		—		107.3		(1,222.1		)	—
Other long-term assets, including discontinued operations	9.3		35.3		15.0		—			59.6
Total assets	$	1,124.1	$	2,734.9	$	833.2	$	(1,222.1	)	$	3,470.1
Liabilities and Equity
Total current liabilities	$	—	$	736.6	$	174.3	$	—		$	910.9
Long-term debt	—		1,053.6		34.7		—			1,088.3
Advances from consolidated affiliates, net	—		23.8		—		(23.8		)	—
Other liabilities	—		190.8		151.2		—			342.0
Total liabilities	$	—	$	2,004.8	$	360.2	$	(23.8	)	$	2,341.2
Total equity	$	1,124.1	$	730.1	$	473.0	$	(1,198.3	)	$	1,128.9
Total liabilities and equity	$	1,124.1	$	2,734.9	$	833.2	$	(1,222.1	)	$	3,470.1



As of December 31, 2013:	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Current assets, including discontinued operations	$	—	$	1,156.7	$	150.3	$	—		$	1,307.0
Property and equipment, net	—		420.2		67.9		—			488.1
Goodwill and other intangible assets, net	—		932.8		134.9		—			1,067.7
Investments in and advances to consolidated affiliates, net	1,006.8		170.8		—		(1,177.6		)	—
Other long-term assets, including discontinued operations	9.3		36.2		14.9		—			60.4
Total assets	$	1,016.1	$	2,716.7	$	368.0	$	(1,177.6	)	$	2,923.2
Liabilities and Equity
Total current liabilities	$	—	$	773.3	$	55.9	$	—		$	829.2
Long-term debt	—		760.9		4.5		—			765.4
Advances from consolidated affiliates, net	—		—		22.5		(22.5		)	—
Other liabilities	—		236.4		71.1		—			307.5
Total liabilities	$	—	$	1,770.6	$	154.0	$	(22.5	)	$	1,902.1
Total equity	$	1,016.1	$	946.1	$	214.0	$	(1,155.1	)	$	1,021.1
Total liabilities and equity	$	1,016.1	$	2,716.7	$	368.0	$	(1,177.6	)	$	2,923.2

Condensed Unaudited Consolidating Statements of Cash Flows

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF CASH FLOWS (in millions)



For the Nine Months Ended September 30, 2014:	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(1.1	)	$	39.6		$	42.5		$	—	$	81.0
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	—			(39.9		)	(123.0		)	—		(162.9		)
Capital expenditures	—			(75.6		)	(15.4		)	—		(91.0		)
Proceeds from sale of property and equipment	—			10.3			1.9			—		12.2
Payments for other investments, net	—			(1.0		)	—			—		(1.0		)
Net cash used in investing activities	$	—		$	(106.2	)	$	(136.5	)	$	—	$	(242.7	)
Cash flows provided by (used in) financing activities:
Proceeds from credit facility	—			1,122.4			197.2			—		1,319.6
Repayments of credit facility	—			(723.2		)	(232.0		)	—		(955.2		)
Repayments of senior convertible notes	—			(105.3		)	—			—		(105.3		)
Repayments of other borrowings and capital lease obligations	—			(45.3		)	(8.8		)	—		(54.1		)
Excess tax benefits and net proceeds from stock-based awards	2.9			0.9			—			—		3.8
Payments of acquisition-related contingent consideration	—			(60.3		)	—			—		(60.3		)
Payments of financing costs	—			(1.5		)	—			—		(1.5		)
Net financing activities and advances (to) from consolidated affiliates	(1.8		)	(124.1		)	125.9			—		—
Net cash provided by financing activities	$	1.1		$	63.6		$	82.3		$	—	$	147.0
Effect of currency translation on cash	—			—			(1.2		)	—		(1.2		)
Net decrease in cash and cash equivalents	$	—		$	(3.0	)	$	(12.9	)	$	—	$	(15.9	)
Cash and cash equivalents - beginning of period	—			5.3			17.7			—		23.0
Cash and cash equivalents - end of period	$	—		$	2.3		$	4.8		$	—	$	7.1



For the Nine Months Ended September 30, 2013:	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(2.4	)	$	103.2		$	28.5		$	—	$	129.3
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	—			(43.0		)	(103.6		)	—		(146.6		)
Capital expenditures	—			(96.8		)	(4.6		)	—		(101.4		)
Proceeds from sale of property and equipment	—			7.6			0.7			—		8.3
Proceeds from disposal of business, net of cash divested	$	—		$	(4.3	)	$	—		$	—	$	(4.3	)
Proceeds from other investments, net	$	—		$	3.8		$	—		$	—	$	3.8
Net cash used in investing activities	$	—		$	(132.7	)	$	(107.5	)	$	—	$	(240.2	)
Cash flows provided by (used in) financing activities:
Proceeds from credit facility	$	—		$	639.6		$	126.6		$	—	$	766.2
Repayments of credit facility	—			(737.2		)	(123.0		)	—		(860.2		)
Proceeds from senior notes, net	—			250.0			—			—		250.0
Repayments of other borrowings and capital lease obligations	—			(55.5		)	(1.0		)	—		(56.5		)
Excess tax benefits and net proceeds from stock-based awards	9.2			3.0			—			—		12.2
Payments of acquisition-related contingent consideration	—			(12.8		)	—			—		(12.8		)
Payments of financing costs, including call premiums on extinguishment of debt	—			(11.8		)	—			—		(11.8		)
Net financing activities and advances (to) from consolidated affiliates	(6.8		)	(56.4		)	63.2			—		—
Net cash provided by financing activities	$	2.4		$	18.9		$	65.8		$	—	$	87.1
Effect of currency translation on cash	—			—			(0.1		)	—		(0.1		)
Net decrease in cash and cash equivalents	$	—		$	(10.6	)	$	(13.3	)	$	—	$	(23.9	)
Cash and cash equivalents - beginning of period	—			12.7			14.0			—		26.7
Cash and cash equivalents - end of period	$	—		$	2.1		$	0.7		$	—	$	2.8

Business, Basis of Presentation and Significant Accounting Policies (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2014 USD ($) segment	Dec. 31, 2013 USD ($)
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Number of reportable segments \| segment	5
Revenue Recognition [Line Items]
Unapproved change orders, description	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. As of September 30, 2014 and December 31, 2013, the Company had approximately $78 million and $79 million, respectively, of change orders and/or claims that had been included as contract price adjustments on certain contracts that were in the process of being resolved in the normal course of business, including through negotiation, in arbitration and other proceedings. These contract price adjustments represent management's best estimate of additional contract revenues that have been or will be earned and that management believes are probable of collection. The amounts ultimately realized upon final acceptance by its customers could be higher or lower than such estimated amounts, which are primarily expected to be billed and collected within one year.
Unapproved change orders, amount \| $	$ 78	$ 79
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting Standards Not Yet Adopted	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606). The core principle of this ASU is that a company will recognize revenue when it transfers goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under current guidance and will be required to disclose information about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including disclosure of assumptions and estimates where significant judgment has been applied. ASU 2014-09 is effective using either the retrospective or cumulative effect transition method for fiscal years, and interim periods within those years, beginning after December 15, 2016. Early application is not permitted. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements. In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity (“ASU 2014-08”). ASU 2014-08 changes the requirements for reporting discontinued operations and requires additional disclosures about discontinued operations. Only disposals of components of an entity representing a strategic shift that has, or will have, a major effect on an entity’s operations and financial results should be reported as discontinued operations under ASU 2014-08. Examples include a disposal of a major geographical area, a major line of business, or a major equity method investment. ASU 2014-08 also requires expanded disclosures about discontinued operations and requires disclosures about individually significant dispositions that do not qualify as discontinued operations. ASU 2014-08 is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2014. Early adoption is permitted only for disposals that have not been previously reported. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements.
Recently Adopted Accounting Pronouncements	In July 2013, the FASB issued ASU 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the FASB Emerging Issues Task Force) (“ASU 2013-11”). ASU 2013-11 provides guidance on the presentation in the financial statements of an unrecognized tax benefit, or a portion of an unrecognized tax benefit, and explains that unrecognized tax benefits should be presented as a reduction to deferred tax assets for net operating loss carryforwards, similar tax losses or tax credit carryforwards. To the extent a net operating loss carryforward, similar tax loss or tax credit carryforward is not available as of the reporting date under the tax law of the applicable jurisdiction, or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. ASU 2013-11 applies to all entities that have unrecognized tax benefits when a net operating loss carryforward, similar tax loss, or tax credit carryforward exists as of the reporting date. ASU 2013-11 is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. Retrospective application is permitted. The Company adopted ASU 2013-11 as of January 1, 2014. The adoption of this ASU did not have a material impact on the condensed unaudited consolidated financial statements.
Plan [Member] \| Maximum [Member] \| Unapproved Change Orders [Member] \| Unbilled Revenue [Member]
Revenue Recognition [Line Items]
Unapproved change orders, period expected to be outstanding	1 year

Earnings Per Share (Methodology) (Narrative) (Details)	9 Months Ended
Earnings Per Share (Methodology) (Narrative) (Details)	Sep. 30, 2014
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. The potential issuance of common shares upon the exercise, conversion or vesting of 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, may be dilutive.
Convertible Debt [Member] \| 2009 Convertible Notes [Member]
Earnings Per Share [Line Items]
Computation of earnings per share, methodology	Dilutive shares associated with the 2009 Convertible Notes are attributable to the underlying principal amounts. The number of common shares issuable upon conversion of the Company’s 2009 Convertible 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 its 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 for the period associated with the 2009 Convertible Notes, and correspondingly, the 2009 Convertible Notes are assumed to have been converted, with the resulting common shares added to the number of weighted average shares outstanding.
Convertible Debt [Member] \| 2011 Convertible Notes [Member]
Earnings Per Share [Line Items]
Computation of earnings per share, methodology	The 2011 Convertible Notes have an optional cash settlement feature under which, in June 2014, the Company settled the principal amount of the 2011 4.0% Notes in cash, and the Company intends to settle the principal amount of the 2011 4.25% Notes in cash in December 2014. Given the Company's intention, dilutive shares associated with the 2011 Convertible Notes are derived from the premium value of the notes in excess of their principal amount, calculated using the treasury stock method. The Company refers to these shares as the "premium shares."

Earnings Per Share (Schedule Of Earnings Per Share Information) (Details) - USD ($)
shares in Thousands, $ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Net income attributable to MasTec:

Net income, continuing operations - basic

^[1]

$ 45,591

$ 49,960

$ 93,936

$ 104,702

Net income attributable to MasTec - diluted

45,291

46,217

93,510

99,685

Net loss from discontinued operations - basic and diluted

^[1]

$ (320)

$ (3,822)

$ (592)

$ (5,253)

Weighted average shares outstanding:

Weighted average shares outstanding - basic

81,811

77,093

79,158

76,816

Dilutive common stock equivalents

814

775

798

774

Weighted average shares outstanding - diluted

85,824

85,464

86,416

84,733

Continuing Operations [Member]

Net income attributable to MasTec:

Net income attributable to MasTec - diluted

$ 45,611

$ 50,039

$ 94,102

$ 104,938

2009 Convertible Notes [Member]

Net income attributable to MasTec:

Interest expense, net of tax, 2009 Convertible Notes

$ 20

$ 79

$ 166

$ 236

Weighted average shares outstanding:

Dilutive shares, 2009 Convertible Notes

194

806

560

806

2011 Convertible Notes [Member] | Convertible Debt [Member]

Weighted average shares outstanding:

Dilutive premium shares, 2011 Convertible Notes

3,005

6,790

5,900

6,337

[1]	Calculated as total net income (loss) less amounts attributable to non-controlling interests.

Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Line Items]
Debt instrument, settlement in cash				$ 105,325	$ 150,000
Weighted average anti-dilutive common stock equivalents, shares		304,486	0	223,422	0
4.0% Convertible Notes [Member] \| Common Stock [Member]
Earnings Per Share [Line Items]
Debt instrument, convertible, common shares issued	4,200,000
2011 4.0% Notes [Member] \| Common Stock [Member]
Earnings Per Share [Line Items]
Debt instrument, convertible, common shares issued	3,600,000
2009 4.0% Notes [Member] \| Common Stock [Member]
Earnings Per Share [Line Items]
Debt instrument, convertible, common shares issued	600,000
Unsecured Debt [Member] \| 4.0% Convertible Notes [Member]
Earnings Per Share [Line Items]
Debt instrument, convertible, conversion price per share		$ 15.76		$ 15.76
Unsecured Debt [Member] \| 2011 4.0% Notes [Member]
Earnings Per Share [Line Items]
Debt instrument, convertible, conversion price per share		15.76		15.76
Unsecured Debt [Member] \| 2009 4.0% Notes [Member]
Earnings Per Share [Line Items]
Debt instrument, convertible, conversion price per share		15.76		15.76
Unsecured Debt [Member] \| 4.25% Convertible Notes [Member]
Earnings Per Share [Line Items]
Debt instrument, convertible, conversion price per share		15.48		15.48
Unsecured Debt [Member] \| 2011 4.25% Notes [Member]
Earnings Per Share [Line Items]
Debt instrument, convertible, conversion price per share		15.48		15.48
Unsecured Debt [Member] \| 2009 4.25% Notes [Member]
Earnings Per Share [Line Items]
Debt instrument, convertible, conversion price per share		$ 15.48		$ 15.48
Convertible Debt [Member] \| 2011 4.0% Notes [Member]
Earnings Per Share [Line Items]
Debt instrument, settlement in cash	$ 105,300
Convertible Debt [Member] \| 2011 4.25% Notes [Member]
Earnings Per Share [Line Items]
Premium shares		3,005,000	3,314,000	3,501,000	3,097,000
Convertible Debt [Member] \| 2011 4.0% Notes [Member]
Earnings Per Share [Line Items]
Premium shares			3,476,000	2,400,000	3,240,000
Convertible Debt [Member] \| Unsecured Debt [Member] \| 4.0% Convertible Notes [Member]
Earnings Per Share [Line Items]
Debt instrument, convertible, interest rate		4.00%		4.00%
Debt instrument, convertible, matured and converted	115,000
Convertible Debt [Member] \| Unsecured Debt [Member] \| 2011 4.0% Notes [Member]
Earnings Per Share [Line Items]
Debt instrument, convertible, interest rate		4.00%		4.00%
Debt instrument, convertible, matured and converted	105,300
Convertible Debt [Member] \| Unsecured Debt [Member] \| 2009 4.0% Notes [Member]
Earnings Per Share [Line Items]
Debt instrument, convertible, interest rate		4.00%		4.00%
Debt instrument, convertible, matured and converted	$ 9,600
Convertible Debt [Member] \| Unsecured Debt [Member] \| 4.25% Convertible Notes [Member]
Earnings Per Share [Line Items]
Principal amount		$ 100,000		$ 100,000
Debt instrument, convertible, interest rate		4.25%		4.25%
Convertible Debt [Member] \| Unsecured Debt [Member] \| 2011 4.25% Notes [Member]
Earnings Per Share [Line Items]
Principal amount		$ 97,000		$ 97,000
Debt instrument, convertible, interest rate		4.25%		4.25%
Convertible Debt [Member] \| Unsecured Debt [Member] \| 2009 4.25% Notes [Member]
Earnings Per Share [Line Items]
Principal amount		$ 3,000		$ 3,000
Debt instrument, convertible, interest rate		4.25%		4.25%

Earnings Per Share (Schedule Of Convertible Note Premium Share Information) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014 USD ($) shares $ / shares	Sep. 30, 2013 USD ($) shares $ / shares	Sep. 30, 2014 USD ($) shares $ / shares	Sep. 30, 2013 USD ($) shares $ / shares
2011 4.25% Notes [Member]
Earnings Per Share [Line Items]
Number of conversion shares, principal amount	6,268	6,268	6,268	6,268
Premium value \| $	$ 89,341	$ 108,864	$ 122,748	$ 94,728
2011 4.25% Notes [Member] \| Convertible Debt [Member]
Earnings Per Share [Line Items]
Per share price, actual average \| $ / shares	$ 29.73	$ 32.84	$ 35.06	$ 30.59
Premium shares	3,005	3,314	3,501	3,097
2011 4.0% Notes [Member]
Earnings Per Share [Line Items]
Number of conversion shares, principal amount		6,683		6,683
Premium value \| $		$ 114,176		$ 99,104
2011 4.0% Notes [Member] \| Convertible Debt [Member]
Earnings Per Share [Line Items]
Per share price, actual average \| $ / shares		$ 32.84		$ 30.59
Premium shares		3,476	2,400	3,240

Acquisitions (Narrative) (Details)	9 Months Ended
Acquisitions (Narrative) (Details)	Sep. 30, 2014
Business Combinations [Abstract]
Business combinations, provisional information, initial accounting incomplete, items	As of September 30, 2014, the allocations of purchase price to the fair values of tangible and intangible assets and liabilities, including the estimated values of contingent earn-out obligations and the estimated useful lives of acquired assets for the Company's 2014 acquisitions are provisional and remain preliminary. Management continues to assess the valuation of these items and any ultimate purchase price adjustments that may result based on the final net assets and net working capital of the acquired businesses, as prescribed in the corresponding purchase agreements.
Business combinations, provisional information, initial accounting incomplete, reasons	The Company will revise its preliminary allocations for acquired businesses if new information is obtained about the facts and circumstances existing as of the date of acquisition, or for purchase price adjustments, based on the final net assets and net working capital of the acquired businesses, as prescribed in the applicable purchase agreement.

Acquisitions (2014 Acquisitions) (Narrative) (Details) - USD ($)				3 Months Ended	9 Months Ended
	Jun. 01, 2014	Apr. 01, 2014	Jan. 01, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Performance Guarantees [Member]
Business Combinations [Line Items]
Guarantees issued, related parties				$ 748,600,000	$ 748,600,000		$ 1,100,000,000
Earn-Out Arrangements [Member]
Business Combinations [Line Items]
Fair value of contingent consideration (earn-out liability)					$ 34,988,000	$ 29,971,000
Pacer [Member]
Business Combinations [Line Items]
Business combinations, effective date					Jun. 01, 2014
Business combinations, percentage of voting interests acquired				100.00%	100.00%
Business combinations, name of acquired entity					Pacer Construction Holdings Corporation and its affiliated operating companies (collectively, "Pacer")
Business combinations, description of acquired entity					Pacer is a western Canadian civil construction services company, headquartered in Calgary, Alberta, Canada. Pacer’s services include infrastructure construction primarily in support of oil and gas production, processing, mining and transportation.
Business combinations, provisional information, initial accounting incomplete, adjustment, intangible assets				$ 2,700,000
Business combinations, provisional information, initial accounting incomplete, adjustment, goodwill				16,600,000
Business combinations, goodwill recognized, description					Goodwill arising from the acquisition represents the estimated value of Pacer'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 Pacer and MasTec.
Business combinations, goodwill, expected tax deductible amount	$ 0
Business combinations, payments in cash	126,500,000
Pacer [Member] \| Investee [Member] \| Performance Guarantees [Member]
Business Combinations [Line Items]
Guarantees issued, related parties				219,000,000	$ 219,000,000
Pacer [Member] \| Investee [Member] \| Performance Guarantees [Member] \| Beneficial Ownership [Member]
Business Combinations [Line Items]
Guarantees issued, related parties				92,000,000	92,000,000
Pacer [Member] \| Investee [Member] \| Other Financial Guarantees [Member]
Business Combinations [Line Items]
Guarantees issued, related parties				31,000,000	31,000,000
Pacer [Member] \| Investee [Member] \| Financing Receivables [Member] \| Other Current Assets [Member]
Business Combinations [Line Items]
Other receivables, due from related parties				14,800,000	14,800,000
Pacer [Member] \| Investee [Member] \| Related Customer [Member] \| Infrastructure Construction Services [Member]
Business Combinations [Line Items]
Revenue, related parties				2,000,000	3,000,000
Receivables, related parties				2,500,000	$ 2,500,000
Pacer [Member] \| Earn-Out Arrangements [Member]
Business Combinations [Line Items]
Business combinations, provisional information, initial accounting incomplete, adjustment, liabilities				1,400,000
Fair value of contingent consideration (earn-out liability)	25,700,000
Pacer [Member] \| Current Liabilities [Member]
Business Combinations [Line Items]
Business combinations, provisional information, initial accounting incomplete, adjustment, liabilities				7,800,000
Pacer [Member] \| Liability [Member] \| Earn-Out Arrangements [Member]
Business Combinations [Line Items]
Business combinations, contingent consideration arrangements, basis for amount					The contingent consideration included in the table above is equal to 25% of the excess, if any, of Pacer’s earnings from continuing operations before interest, taxes, depreciation and amortization (“EBITDA”) above certain thresholds for a five-year period, as set forth in the purchase agreement, and is payable annually in Canadian dollars.
Business combinations, contingent consideration, percentage of excess EBITDA					25.00%
Business combinations, contingent consideration, earn-out period (in years)					5 years
Business combinations, contingent consideration, fair value measurements, significant assumptions					The fair value of the earn-out liability 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 combinations, contingent consideration arrangements, range of outcomes, value, low	0
Business combinations, contingent consideration arrangements, range of outcomes, value, high	$ 69,000,000
Business combinations, contingent consideration arrangements, range of outcomes, maximum unlimited					there is no maximum earn-out payment amount
Pacer [Member] \| Other Non-Current Assets [Member]
Business Combinations [Line Items]
Business combination, provisional information, initial accounting incomplete, adjustment, assets				$ (9,800,000)
April 2014 Acquisitions [Member]
Business Combinations [Line Items]
Business combinations, effective date					Apr. 01, 2014
Business combinations, percentage of voting interests acquired				100.00%	100.00%
Business combinations, description of acquired entity					a telecommunications services firm that specializes in the installation of in-home security systems
Business combinations, payments in cash		$ 17,200,000
April 2014 Acquisitions [Member] \| Earn-Out Arrangements [Member]
Business Combinations [Line Items]
Fair value of contingent consideration (earn-out liability)		$ 600,000
April 2014 Acquisitions [Member] \| Liability [Member] \| Earn-Out Arrangements [Member]
Business Combinations [Line Items]
Business combinations, contingent consideration, earn-out period (in years)					5 years
January 2014 Acquisitions [Member]
Business Combinations [Line Items]
Business combinations, effective date					Jan. 01, 2014
Business combinations, percentage of voting interests acquired				100.00%	100.00%
Business combinations, description of acquired entity					a telecommunications services firm that specializes in the engineering, installation, furnishing and integration of telecommunications equipment
Business combinations, payments in cash			$ 23,800,000
January 2014 Acquisitions [Member] \| Earn-Out Arrangements [Member]
Business Combinations [Line Items]
Fair value of contingent consideration (earn-out liability)			$ 8,700,000
January 2014 Acquisitions [Member] \| Liability [Member] \| Earn-Out Arrangements [Member]
Business Combinations [Line Items]
Business combinations, contingent consideration, earn-out period (in years)					5 years

Acquisitions (Schedule of Consideration Paid And Net Assets Acquired, Business Acquisitions) (Details) - USD ($) $ in Thousands		9 Months Ended
	Jun. 01, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Identifiable assets acquired and liabilities assumed:
Goodwill		$ 1,000,024		$ 902,044
Earn-Out Arrangements [Member]
Acquisition consideration:
Fair value of contingent consideration (earn-out liability)		$ 34,988	$ 29,971
Pacer [Member]
Acquisition consideration:
Cash	$ 126,500
Total consideration transferred	152,200
Identifiable assets acquired and liabilities assumed:
Current assets	118,400
Other long-term assets	100
Property and equipment	72,800
Finite-lived intangible assets	20,300
Current liabilities	(55,800)
Long-term debt	(87,000)
Deferred income taxes	(29,600)
Total identifiable net assets	82,700
Goodwill	69,500
Total net assets acquired, including goodwill	152,200
Pacer [Member] \| Pre-Qualifications [Member]
Identifiable assets acquired and liabilities assumed:
Pre-qualifications	41,200
Pacer [Member] \| Equity Method Investments [Member]
Identifiable assets acquired and liabilities assumed:
Equity method investments	2,300
Pacer [Member] \| Earn-Out Arrangements [Member]
Acquisition consideration:
Fair value of contingent consideration (earn-out liability)	$ 25,700

Acquisitions (Schedule of Finite-Lived Intangible Assets Acquired, Business Acquisitions) (Details) - Pacer [Member] $ in Millions	Jun. 01, 2014 USD ($)
Finite-Lived Intangible Assets Acquired [Line Items]
Finite-lived intangible assets	$ 20.3
Finite-lived intangible assets, weighted average useful life	6 years
Backlog [Member]
Finite-Lived Intangible Assets Acquired [Line Items]
Finite-lived intangible assets	$ 6.1
Finite-lived intangible assets, weighted average useful life	2 years
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets Acquired [Line Items]
Finite-lived intangible assets	$ 2.3
Finite-lived intangible assets, weighted average useful life	8 years
Customer Relationships [Member]
Finite-Lived Intangible Assets Acquired [Line Items]
Finite-lived intangible assets	$ 11.9
Finite-lived intangible assets, weighted average useful life	8 years

Acquisitions (2013 Acquisitions) (Narrative) (Details)	9 Months Ended
Acquisitions (2013 Acquisitions) (Narrative) (Details)	Sep. 30, 2014
Big Country [Member]
Business Combinations [Line Items]
Business combinations, effective date	May 01, 2013
Business combinations, percentage of voting interests acquired	100.00%
Business combinations, name of acquired entity	Big Country Energy Services, Inc. and its affiliated operating companies (collectively, "Big Country").
Business combinations, description of acquired entity	Big Country, which is included in the Company's Oil and Gas segment, is a North American oil and gas pipeline and facility construction services company, headquartered in Calgary, Alberta, Canada.
April 2013 Acquisition [Member]
Business Combinations [Line Items]
Business combinations, effective date	Apr. 01, 2013
Business combinations, description of acquired entity	a former subcontractor to its wireless business, which provides self-perform communications tower construction, installation, maintenance and other services in support of telecommunications infrastructure construction
August 2013 Acquisition [Member]
Business Combinations [Line Items]
Business combinations, effective date	Aug. 01, 2013
Business combinations, description of acquired entity	an electrical transmission services company that provides substation construction activities

Acquisitions (Schedule of Measurement Period Adjustments, Business Acquisitions) (Details) - USD ($) $ in Thousands	Sep. 30, 2014	Dec. 31, 2013
Measurement Period Adjustments [Line Items]
Current assets	$ 1,573,952	$ 1,307,026
Goodwill	1,000,024	902,044
Current liabilties	910,874	829,225
Long-term deferred tax liabilities, net	$ 180,449	154,763
As Previously Reported [Member]
Measurement Period Adjustments [Line Items]
Current assets		1,306,000
Goodwill		899,400
Current liabilties		825,500
Long-term deferred tax liabilities, net		154,900
Measurement Period Adjustments [Member] \| 2013 Acquisitions [Member]
Measurement Period Adjustments [Line Items]
Current assets		1,000
Goodwill		2,600
Current liabilties		3,700
Long-term deferred tax liabilities, net		$ (100)

Acquisitions (Schedule of Pro Forma Information, Business Acquisitions) (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Business combinations, pro forma information, description

Business combinations, pro forma revenue

$ 1,309.6

$ 1,417.5

$ 3,496.0

$ 3,667.3

Business combinations, pro forma net income from continuing operations

46.0

52.4

96.5

118.0

Business combinations, acquiree revenue, year over year incremental impact

133.2

141.6

342.5

270.4

Business combinations, acquiree net income from continuing operations, year over year incremental impact

^[1]

2.3

7.5

4.5

12.8

General and Administrative Costs [Member]

Business combinations, acquisition costs

$ 0.4

$ 0.3

$ 2.0

$ 1.6

[1]

Discontinued Operations (Narrative) (Details) - Globetec [Member]		9 Months Ended
	Aug. 31, 2013	Sep. 30, 2014
Discontinued Operations Disclosures [Line Items]
Discontinued operation, description		In 2012, the Company's board of directors approved a plan of sale for Globetec Construction, LLC ("Globetec"). Accordingly, Globetec's projects and assets are reflected as assets and liabilities of discontinued operations, and Globetec's results of operations are presented as discontinued operations in the condensed unaudited consolidated financial statements for all periods presented. Effective August 31, 2013, the Company sold all of its membership interests in Globetec for nominal consideration and retained certain contingent assets and liabilities.
Discontinued operation, disposal date		Aug. 31, 2013
Discontinued operation, membership interests remaining	0.00%

Discontinued Operations (Summary of Assets and Liabilities) (Details) - Globetec [Member] - USD ($) $ in Millions	Sep. 30, 2014	Dec. 31, 2013
Discontinued Operations Disclosures [Line Items]
Current assets	$ 5.0	$ 2.3
Long-term assets	7.1	10.1
Assets of discontinued operations	12.1	12.4
Current liabilities of discontinued operations	$ 1.2	$ 1.2

Discontinued Operations (Results of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Discontinued Operations Disclosures [Line Items]
Net loss from discontinued operations	$ (320)	$ (3,735)	$ (592)	$ (5,165)
Globetec [Member]
Discontinued Operations Disclosures [Line Items]
Revenue		4,800		18,000
Loss from operations, before tax		(500)		(2,700)
Impairment of assets, before tax		(5,700)		(6,000)
Income tax benefit		2,500		3,500
Net loss from discontinued operations		$ (3,700)		$ (5,200)

Goodwill and Other Intangible Assets (Rollforward of Goodwill by Segment) (Details)
$ in Thousands

9 Months Ended

Sep. 30, 2014

USD ($)

$ 902,044

98,100

(4,700)

Earn-Out Arrangements [Member]

1,000,024

Accruals of acquisition-related contingent consideration, net

4,600

^[1]

Reportable Segments [Member] | Communications [Member]

326,800

28,600

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

360,000

307,700

69,500

(4,700)

Reportable Segments [Member] | Electrical Transmission [Member]

372,500

149,900

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

149,900

117,600

Reportable Segments [Member] | Earn-Out Arrangements [Member] | Communications [Member]

117,600

Accruals of acquisition-related contingent consideration, net

4,600

^[1]

Reportable Segments [Member] | Earn-Out Arrangements [Member] | Oil and Gas [Member]

Accruals of acquisition-related contingent consideration, net

^[1]

Reportable Segments [Member] | Earn-Out Arrangements [Member] | Electrical Transmission [Member]

Accruals of acquisition-related contingent consideration, net

^[1]

Reportable Segments [Member] | Earn-Out Arrangements [Member] | Power Generation and Industrial [Member]

Accruals of acquisition-related contingent consideration, net

$ 0

^[1]

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

Goodwill And Other Intangible Assets (Rollforward of Other Intangible Assets) (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Other intangible assets, gross carrying amount

$ 245,100

Accumulated amortization

(79,500)

Other intangible assets, net, beginning balance

$ 165,606

Additions from new business combinations, other intangible assets

77,000

Amortization expense

$ (6,600)

$ (5,800)

(17,000)

$ (15,200)

Currency translation adjustments, other intangible assets

(3,400)

Other intangible assets, net, ending balance

222,212

Customer Relationships and Backlog [Member]

Other intangible assets, amortizing, gross carrying amount

128,400

Accumulated amortization

(67,700)

Other intangible assets, net, amortizing, beginning balance

60,700

Additions from new business combinations, amortizing intangible assets

33,100

Amortization expense

(15,700)

Currency translation adjustments, amortizing intangible assets

(800)

Other intangible assets, net, amortizing, ending balance

77,300

Other Amortizing Intangible Assets [Member]

Other intangible assets, amortizing, gross carrying amount

^[1]

22,500

Accumulated amortization

^[1]

(11,800)

Other intangible assets, net, amortizing, beginning balance

^[1]

10,700

Additions from new business combinations, amortizing intangible assets

^[1]

2,700

Amortization expense

^[1]

(1,300)

Currency translation adjustments, amortizing intangible assets

^[1]

Other intangible assets, net, amortizing, ending balance

^[1]

12,100

Trade Names [Member]

Other intangible assets, non-amortizing, gross carrying amount

34,800

Other intangible assets, non-amortizing, beginning balance

34,800

Additions from new business combinations, non-amortizing intangible assets

Currency translation adjustments, non-amortizing intangible assets

Other intangible assets, non-amortizing, ending balance

34,800

Pre-Qualifications [Member]

Other intangible assets, non-amortizing, gross carrying amount

98,000

59,400

$ 59,400

Other intangible assets, non-amortizing, beginning balance

59,400

Additions from new business combinations, non-amortizing intangible assets

41,200

Currency translation adjustments, non-amortizing intangible assets

(2,600)

Other intangible assets, non-amortizing, ending balance

$ 98,000

[1]	Consists principally of amortizing trade names and non-compete agreements.

Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense, intangible assets	$ 6.6	$ 5.8	$ 17.0	$ 15.2

Fair Value Of Financial Instruments (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Fair Value, Measurements, Non-Recurring [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
Cost and equity method investments, including long-term receivables from investees and joint ventures, aggregate carrying value	$ 15,000,000		$ 15,000,000		$ 15,800,000
Level 1 [Member] \| Fair Value, Measurements, Non-Recurring [Member] \| Unsecured Debt [Member] \| Senior Notes [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
Fair value measurements, valuation techniques			The estimated fair values of the Company’s 4.875% Senior Notes, 2009 Convertible Notes and 2011 Convertible Notes are based on quoted market prices, a Level 1 input.
Earn-Out Arrangements [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
Additions from new business combinations, ASC 805 contingent consideration	0	$ 3,300,000	$ 35,000,000	$ 30,000,000
Payments of ASC 805 contingent consideration	1,300,000	0	48,300,000	2,700,000
Earn-Out Arrangements [Member] \| Foreign Currency Translation Adjustments [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
Foreign currency translation gains (losses), other comprehensive income, ASC 805 contingent consideration	2,900,000	$ (700,000)	$ 2,500,000	$ 1,100,000
Earn-Out Arrangements [Member] \| Level 3 [Member] \| Fair Value, Measurements, Recurring [Member] \| Liability [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
Fair value measurements, valuation techniques			The fair value of ASC 805 contingent consideration is based on management estimates and entity-specific assumptions and is evaluated on an on-going basis.
Earn-Out Arrangements [Member] \| Level 3 [Member] \| Fair Value [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
ASC 805 contingent consideration, fair value	$ 149,600,000		$ 149,600,000		$ 165,400,000

Fair Value of Financial Instruments (Schedule Of Fair Values Of Selected Financial Instruments Measured On A Non-Recurring Basis) (Details) - Unsecured Debt [Member] - USD ($) $ in Millions	Sep. 30, 2014	Dec. 31, 2013
Senior Notes [Member] \| 4.875% Senior Notes [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
Debt instrument, interest rate	4.875%
Fair Value, Measurements, Non-Recurring [Member] \| 2009 Convertible Notes [Member] \| Carrying Amount [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
Convertible notes	$ 3.0	$ 12.6
Fair Value, Measurements, Non-Recurring [Member] \| 2009 Convertible Notes [Member] \| Fair Value [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
Convertible notes	5.9	26.6
Fair Value, Measurements, Non-Recurring [Member] \| 2011 Convertible Notes [Member] \| Carrying Amount [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
Convertible notes	97.0	198.3
Fair Value, Measurements, Non-Recurring [Member] \| 2011 Convertible Notes [Member] \| Fair Value [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
Convertible notes	192.1	428.3
Fair Value, Measurements, Non-Recurring [Member] \| Senior Notes [Member] \| 4.875% Senior Notes [Member] \| Carrying Amount [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
Senior notes	400.0	400.0
Fair Value, Measurements, Non-Recurring [Member] \| Senior Notes [Member] \| 4.875% Senior Notes [Member] \| Fair Value [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
Senior notes	$ 377.0	$ 380.0

Accounts Receivable, Net Of Allowance (Schedule Of Accounts Receivable, Net of Allowance) (Details) - USD ($) $ in Thousands	Sep. 30, 2014	Dec. 31, 2013
Receivables [Abstract]
Contract billings	$ 775,600	$ 606,500
Retainage	179,300	159,300
Costs and earnings in excess of billings	451,700	384,600
Accounts receivable, gross	1,406,600	1,150,400
Less allowance for doubtful accounts	(16,700)	(15,700)
Accounts receivable, net	$ 1,389,903	$ 1,134,693

Accounts Receivable, Net of Allowance (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Receivables [Abstract]
Provision for doubtful accounts	$ 0.3	$ 1.9	$ 1.1	$ 4.4

Property And Equipment, Net (Schedule Of Property And Equipment, Net) (Details) - USD ($) $ in Thousands	Sep. 30, 2014	Dec. 31, 2013
Property and Equipment [Line Items]
Property and equipment	$ 1,060,700	$ 863,400
Less accumulated depreciation and amortization	(446,300)	(375,300)
Property and equipment, net	614,359	488,132
Land [Member]
Property and Equipment [Line Items]
Property and equipment	4,600	4,800
Building and Leasehold Improvements [Member]
Property and Equipment [Line Items]
Property and equipment	19,200	18,000
Machinery and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	901,600	727,100
Office Furniture and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	118,100	102,500
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment	$ 17,200	$ 11,000

Property And Equipment, Net (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Property and Equipment [Line Items]
Depreciation and amortization	$ 41,747	$ 37,756	$ 111,996	$ 103,111
Property and Equipment [Member]
Property and Equipment [Line Items]
Depreciation and amortization	$ 35,200	$ 32,000	$ 95,000	$ 87,900

Debt (Schedule of Carrying Values of Long-Term Debt) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2014 CAD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)
Debt Instrument [Line Items]
Capital lease obligations		$ 163,600,000	$ 126,000,000
Total debt		1,160,100,000	816,800,000
Less current maturities		(71,798,000)	(51,376,000)
Long-term debt		1,088,289,000	765,425,000
Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maturity date	Oct. 29, 2018
Credit Facility [Member] \| Revolving Loans [Member]
Debt Instrument [Line Items]
Carrying value of debt		449,500,000	53,000,000
Senior Notes [Member] \| Unsecured Debt [Member] \| 4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Mar. 15, 2023
Carrying value of debt		400,000,000	400,000,000
Convertible Debt [Member] \| Unsecured Debt [Member] \| 2011 4.0% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jun. 15, 2014
Convertible Debt [Member] \| Unsecured Debt [Member] \| 2009 4.0% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jun. 15, 2014
Convertible Debt [Member] \| Unsecured Debt [Member] \| 2011 4.0% Notes [Member]
Debt Instrument [Line Items]
Carrying value of debt		0	103,800,000
Convertible Debt [Member] \| Unsecured Debt [Member] \| 2011 4.25% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Dec. 15, 2014
Carrying value of debt		96,400,000	94,500,000
Convertible Debt [Member] \| Unsecured Debt [Member] \| 2009 4.0% Notes [Member]
Debt Instrument [Line Items]
Carrying value of debt		0	9,600,000
Convertible Debt [Member] \| Unsecured Debt [Member] \| 2009 4.25% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Dec. 15, 2014
Carrying value of debt		3,000,000	3,000,000
Other Credit Facilities [Member]
Debt Instrument [Line Items]
Line of credit facility, maturity date	Mar. 03, 2015
Other Credit Facilities [Member] \| Revolving Loans [Member]
Debt Instrument [Line Items]
Carrying value of debt	$ 5.4	4,800,000	0
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital lease obligations, expiration date, range, end	Jun. 13, 2021
Notes Payable [Member] \| Equipment [Member]
Debt Instrument [Line Items]
Notes payable, maturity date, range, end	Sep. 01, 2018
Carrying value of debt		$ 42,800,000	$ 26,900,000

Debt (Schedule of Carrying Values of Long-Term Debt) (Parenthetical) (Details)	Sep. 30, 2014
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Long-term debt instrument, weighted average interest rate	2.80%
Notes Payable [Member] \| Equipment [Member]
Debt Instrument [Line Items]
Long-term debt instrument, weighted average interest rate	2.90%
Unsecured Debt [Member] \| Senior Notes [Member] \| 4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	4.875%
Unsecured Debt [Member] \| Convertible Debt [Member] \| 2011 4.0% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	4.00%
Unsecured Debt [Member] \| Convertible Debt [Member] \| 2009 4.0% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	4.00%
Unsecured Debt [Member] \| Convertible Debt [Member] \| 2011 4.25% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	4.25%
Unsecured Debt [Member] \| Convertible Debt [Member] \| 2009 4.25% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	4.25%

Debt (Senior Secured Credit Facility) (Narrative) (Details) - USD ($)			9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Jun. 30, 2014
Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,000,000,000		$ 1,000,000,000	$ 750,000,000
Line of credit facility, maturity date			Oct. 29, 2018
Line of credit facility, letters of credit issued	135,600,000	$ 134,800,000	$ 135,600,000
Line of credit facility, remaining borrowing capacity	262,500,000	$ 562,100,000	262,500,000
Line of credit facility, reduction in remaining borrowing capacity	$ 152,000,000
Line of credit facility, unused facility fee	0.35%	0.30%
Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 449,500,000	$ 53,000,000	449,500,000
Credit Facility [Member] \| Letters of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, capacity available for letters of credit	$ 262,500,000	$ 315,200,000	$ 262,500,000
Credit Facility [Member] \| Letters of Credit [Member] \| Performance Standby [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate	0.875%	0.75%	0.875%
Credit Facility [Member] \| Letters of Credit [Member] \| Financial Standby [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate	1.75%	1.50%	1.75%
Credit Facility [Member] \| Plan [Member] \| Accordion [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250,000,000		$ 250,000,000
Credit Facility [Member] \| Maximum [Member] \| Canadian Dollars and Mexican Pesos [Member]
Debt Instrument [Line Items]
Line of credit facility, revolving loan sublimit	$ 200,000,000		$ 200,000,000
Credit Facility [Member] \| Maximum [Member] \| Canadian Dollars [Member]
Debt Instrument [Line Items]
Line of credit facility, revolving loan sublimit				$ 100,000,000
Credit Facility [Member] \| Weighted Average [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate	2.12%	2.14%	2.12%
Convertible Debt [Member] \| Unsecured Debt [Member] \| 4.25% Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	4.25%		4.25%

Debt (Other Credit Facilities) (Narrative) (Details) - Other Credit Facilities [Member] $ in Millions	9 Months Ended
	Sep. 30, 2014 CAD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 35.0	$ 31,300,000
Line of credit facility, maturity date	Mar. 03, 2015
Plan [Member]
Debt Instrument [Line Items]
Debt instrument, intent to refinance, description	Outstanding borrowings under the Company's other credit facilities that are not renewed are repaid with borrowings under the Credit Facility. Accordingly, the carrying amounts of the Company's borrowings under other credit facilities are classified within long-term debt in the Company's condensed unaudited consolidated balance sheet as of September 30, 2014.
Revolving Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 5.4	$ 4,800,000	$ 0
Revolving Loans [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate	4.00%	4.00%

Debt (Senior Convertible Notes) (Narrative) (Details) $ / shares in Units, shares in Thousands	1 Months Ended	9 Months Ended
	Jun. 30, 2014 USD ($) shares	Sep. 30, 2014 USD ($) $ / shares shares	Sep. 30, 2013 USD ($)	Dec. 31, 2013 USD ($)
Debt Instrument [Line Items]
Debt instrument, settlement in cash		$ 105,325,000	$ 150,000,000
4.0% Convertible Notes [Member] \| Common Stock [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, common shares issued \| shares	4,200
2011 4.0% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, common shares issued, value		$ 114,785,000	$ 0
2011 4.0% Notes [Member] \| Common Stock [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, common shares issued \| shares	3,600
2009 4.0% Notes [Member] \| Common Stock [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, common shares issued \| shares	600
Convertible Debt [Member] \| 4.0% Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, shares reissued from treasury \| shares	4,200	4,204
Convertible Debt [Member] \| 2011 4.0% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, settlement in cash	$ 105,300,000
Convertible Debt [Member] \| 2011 4.0% Notes [Member] \| Common Stock [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, common shares issued, value	114,800,000
Unsecured Debt [Member] \| 4.25% Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, conversion price per share \| $ / shares		$ 15.48
Unsecured Debt [Member] \| 2011 4.25% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, conversion price per share \| $ / shares		15.48
Unsecured Debt [Member] \| 4.0% Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, conversion price per share \| $ / shares		$ 15.76
Unsecured Debt [Member] \| 2011 4.0% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, conversion ratio		0.0634417
Debt instrument, convertible, conversion price per share \| $ / shares		$ 15.76
Unsecured Debt [Member] \| 2009 4.0% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, conversion ratio		0.0634417
Debt instrument, convertible, conversion price per share \| $ / shares		$ 15.76
Unsecured Debt [Member] \| Convertible Debt [Member] \| 4.25% Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, interest rate		4.25%
Debt instrument, convertible, maturity date		Dec. 15, 2014
Unsecured Debt [Member] \| Convertible Debt [Member] \| 2011 4.25% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, interest rate		4.25%
Debt instrument, convertible, maturity date		Dec. 15, 2014
Debt instrument, convertible, unamortized debt discount and financing costs		$ 600,000
Unsecured Debt [Member] \| Convertible Debt [Member] \| 2011 4.25% Notes [Member] \| Plan [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, intent to refinance, description		The Company expects to settle the principal amount of its 2011 4.25% Notes on a long-term basis with proceeds from the Credit Facility, or through other sources of available funding, and the premium value in shares, consistent with the settlement of the 2011 4.0% Notes in June 2014. Therefore, the Company has reflected the carrying amounts of these notes within long-term debt in the condensed unaudited consolidated balance sheets.
Unsecured Debt [Member] \| Convertible Debt [Member] \| 2011 Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, unamortized debt discount and financing costs				$ 4,000,000
Unsecured Debt [Member] \| Convertible Debt [Member] \| 4.0% Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, interest rate		4.00%
Debt instrument, convertible, matured and converted	115,000,000
Debt instrument, convertible, maturity date		Jun. 15, 2014
Unsecured Debt [Member] \| Convertible Debt [Member] \| 2011 4.0% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, interest rate		4.00%
Debt instrument, convertible, matured and converted	105,300,000
Debt instrument, convertible, maturity date		Jun. 15, 2014
Debt instrument, convertible, conversion rate denominator		$ 1,000
Unsecured Debt [Member] \| Convertible Debt [Member] \| 2009 4.0% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, interest rate		4.00%
Debt instrument, convertible, matured and converted	$ 9,600,000
Debt instrument, convertible, maturity date		Jun. 15, 2014
Debt instrument, convertible, conversion rate denominator		$ 1,000

Debt (Debt Guarantees and Covenants) (Narrative) (Details)	9 Months Ended
	Sep. 30, 2014
Debt Instrument [Line Items]
Debt instrument, covenant compliance	MasTec was in compliance with the provisions and covenants of its outstanding debt instruments as of September 30, 2014 and December 31, 2013.
Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, guarantees	The Credit Facility is guaranteed by certain subsidiaries of the Company.
Senior Notes [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, guarantees	The Company’s 4.875% Senior Notes, 2011 Convertible Notes and 2009 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 Credit Facility or other outstanding indebtedness.
Senior Notes [Member] \| Guarantor Subsidiaries [Member]
Debt Instrument [Line Items]
Guarantor subsidiaries, percentage of voting interests owned	100.00%

Debt (Schedule Of Interest Expense, Net) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest expense:
Contractual and other interest expense	$ 11,300	$ 10,400	$ 31,600	$ 27,900
Accretion of senior convertible note discount	600	1,300	3,400	3,900
Amortization of deferred financing costs	800	1,000	2,700	3,000
Total interest expense	12,700	12,700	37,700	34,800
Interest income	(100)	0	(100)	(300)
Interest expense, net	$ 12,643	$ 12,666	$ 37,595	$ 34,549

Lease Obligations (Capital Leases) (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2014	Dec. 31, 2013
Leases [Abstract]
Assets held under capital lease, gross	$ 276.2	$ 199.6
Assets held under capital lease, net	$ 203.7	$ 141.3

Lease Obligations (Operating Leases) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Lease Term In Excess Of One Year [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense	$ 18.1	$ 12.7	$ 51.5	$ 37.1
Lease Term In Excess Of One Year [Member] \| Minimum [Member]
Operating Leased Assets [Line Items]
Operating leases, term of contract	1 year	1 year	1 year	1 year
Lease Term Of One Year Or Less [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense	$ 54.5	$ 63.0	$ 142.6	$ 138.9
Lease Term Of One Year Or Less [Member] \| Maximum [Member]
Operating Leased Assets [Line Items]
Operating leases, term of contract	1 year	1 year	1 year	1 year

Stock-Based Compensation and Other Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Shares available for grant or issuance	6,193,235	6,193,235		6,193,235
Stock options exercised		0
Stock options exercised, intrinsic value			$ 4.6	$ 6.5	$ 10.4
Stock options exercised, proceeds			0.4	0.8	3.8
Restricted Share Awards [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Stock-based compensation awards, unearned compensation	$ 16.0	$ 16.0		16.0
Stock-based compensation awards, unearned compensation, weighted average expected recognition period	1 year 1 month 6 days
Stock-based compensation, vested awards, intrinsic value		$ 1.1	$ 0.9	$ 7.1	$ 2.0
Stock Options [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Stock-based compensation awards, percentage vested				100.00%
Employee Stock Purchase Plan [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Stock-based compensation plan, description				The Company's employee stock purchase plans allow qualified employees to purchase MasTec common stock at 85% of its fair market value at the lower of (i) the date of commencement of the offering period or (ii) the last day of the exercise period, as defined in the plan documents.
Stock-based compensation, purchase price of common stock, percentage of fair value				85.00%
Stock-based compensation, fair value assumptions, method used				The fair value of purchases under the Company's employee stock purchase plans is estimated using the Black-Scholes option-pricing valuation model.

Stock-Based Compensation and Other Employee Benefit Plans (Summary of Activity, Restricted Share Awards) (Details) - Restricted Share Awards [Member]	9 Months Ended
	Sep. 30, 2014 $ / shares shares
Restricted Share Awards, Activity [Roll Forward]
Non-vested restricted shares, beginning balance \| shares	1,123,545
Granted \| shares	323,249
Vested \| shares	(181,195)
Canceled/forfeited \| shares	(22,442)
Non-vested restricted shares, ending balance \| shares	1,243,157
Restricted Share Awards, Activity, Per Share Weighted Average Grant Date Fair Value [Roll Forward]
Per share weighted average grant date fair value, beginning balance \| $ / shares	$ 23.78
Granted \| $ / shares	41.05
Vested \| $ / shares	20.26
Canceled/forfeited \| $ / shares	17.38
Per share weighted average grant date fair value, ending balance \| $ / shares	$ 28.90

Stock-Based Compensation and Other Employee Benefit Plans (Summary of Activity, Stock Options) (Details) - USD ($)
$ / shares in Units, $ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Outstanding Stock Options, Activity [Roll Forward]

Options outstanding, vested, beginning balance

495,571

Exercised

Canceled/forfeited

Options outstanding, vested, ending balance

284,671

495,571

284,671

Outstanding Stock Options, Per Share Weighted Average Exercise Price [Roll Forward]

Per share weighted average exercise price, vested, beginning balance

$ 11.17

Canceled/forfeited

Per share weighted average exercise price, vested, ending balance

$ 12.06

$ 11.17

$ 12.06

Outstanding Stock Options, Additional Disclosures

Options exercisable

284,671

Options exercisable, per share weighted average exercise price

$ 12.06

Options outstanding, vested, weighted average remaining contractual life (in years)

1 year 6 months 15 days

1 year 11 months 16 days

Options exercisable, weighted average remaining contractual life (in years)

1 year 6 months 15 days

Options outstanding, vested, aggregate intrinsic value

^[1]

$ 5.3

$ 10.7

$ 5.3

Options exercisable, aggregate intrinsic value

^[1]

$ 5.3

Stock Options [Member]

Outstanding Stock Options, Per Share Weighted Average Exercise Price [Roll Forward]

Exercised

$ 9.97

Common Stock [Member]

Outstanding Stock Options, Activity [Roll Forward]

Exercised

(210,900)

[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 Activity, Employee Stock Purchase Plan) (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Common Stock [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Common shares issued	94,761	436,925
Employee Stock Purchase Plan [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Cash proceeds (in millions)	$ 2.5	$ 6.0
Weighted average per share price	$ 26.60	$ 13.69
Weighted average per share grant date fair value	$ 6.34	$ 5.55

Stock-Based Compensation and Other Employee Benefit Plans (Summary of Stock-Based Compensation Expense and Related Tax Benefits) (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]

Stock-based compensation expense

$ 11,584

$ 9,647

Income Tax Effects:

Income tax benefit from stock-based compensation

$ 1,800

$ 4,500

8,400

7,700

Excess tax benefit from stock-based compensation

^[1]

100

3,000

3,494

4,446

General and Administrative Expense [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]

Stock-based compensation expense

$ 4,100

$ 3,000

$ 11,600

$ 9,600

[1]

Other Retirement Plans (Narrative) (Details)	9 Months Ended
Other Retirement Plans (Narrative) (Details)	Sep. 30, 2014
Multiemployer Plans [Abstract]
Multi-employer plans, general nature	Certain of MasTec’s subsidiaries contribute amounts to multi-employer pension and other multi-employer benefit plans and trusts. Contributions are generally based on fixed amounts per hour per employee for employees covered under these plans. 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.

Other Retirement Plans (Schedule of Covered Employees and Contributions, Multi-Employer Plans) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2014 USD ($) employee	Sep. 30, 2013 USD ($) employee	Sep. 30, 2014 USD ($) employee	Sep. 30, 2013 USD ($) employee
Covered Employees and Contributions, Multi-Employer Plans [Line Items]
Multi-employer plans, contributions	$ 12.7	$ 15.9	$ 29.8	$ 33.2
Multi-Employer Plans, Pension [Member]
Covered Employees and Contributions, Multi-Employer Plans [Line Items]
Multi-employer plans, contributions	11.6	14.9	27.3	30.2
Multi-Employer Plans, Postretirement Benefit [Member]
Covered Employees and Contributions, Multi-Employer Plans [Line Items]
Multi-employer plans, contributions	$ 1.1	$ 1.0	$ 2.5	$ 3.0
Workforce Subject to Collective Bargaining Arrangements [Member] \| Unionized Employees [Member] \| Minimum [Member] \| Multi-Employer Plans, Pension And Postretirement Benefit [Member]
Covered Employees and Contributions, Multi-Employer Plans [Line Items]
Multi-employer plans, covered employees \| employee	2,029	2,392	1,098	778
Workforce Subject to Collective Bargaining Arrangements [Member] \| Unionized Employees [Member] \| Maximum [Member] \| Multi-Employer Plans, Pension And Postretirement Benefit [Member]
Covered Employees and Contributions, Multi-Employer Plans [Line Items]
Multi-employer plans, covered employees \| employee	2,167	2,734	2,167	2,734

Equity (Schedule of Share Activity) (Details) - shares	1 Months Ended	3 Months Ended	9 Months Ended
Equity (Schedule of Share Activity) (Details) - shares	Jun. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
Rollforward of Share Activity:
Common shares outstanding, beginning balance			77,258,000
Treasury shares, beginning balance			9,467,286
Shares issued:
Stock option exercises		0
Common shares outstanding, ending balance		81,843,000	81,843,000
Treasury shares, ending balance		5,262,831	5,262,831
Convertible Debt [Member] \| 4.0% Convertible Notes [Member]
Shares issued:
Convertible notes, treasury shares	(4,200,000)		(4,204,000)
Common Stock [Member]
Shares issued:
Stock option exercises			210,900
Restricted share awards			181,000
Other, net			(11,000)
Common Stock [Member] \| Convertible Debt [Member] \| 4.0% Convertible Notes [Member]
Shares issued:
Convertible notes, common shares issued			4,204,000

Equity (Narrative) (Details) - Convertible Debt [Member] - 4.0% Convertible Notes [Member] - USD ($) shares in Thousands, $ in Millions	1 Months Ended	9 Months Ended
	Jun. 30, 2014	Sep. 30, 2014
Debt Conversion [Line Items]
Debt instrument, convertible, shares reissued from treasury	4,200	4,204
Share reissuances, treasury stock, value	$ 66.6

Equity (Schedule of Changes in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Loss [Line Items]
Accumulated other comprehensive loss, beginning balance			$ (13,286)	$ (5,501)
Activity before reclassifications, net of tax			(10,601)	(3,957)
Reclassifications, net of tax			0	(440)
Activity, net of tax	$ (12,944)	$ 2,844	(10,601)	(4,397)
Accumulated other comprehensive loss, ending balance	(23,887)	(9,898)	(23,887)	(9,898)
Foreign Currency [Member]
Accumulated Other Comprehensive Loss [Line Items]
Accumulated other comprehensive loss, beginning balance			(7,998)	(106)
Activity before reclassifications, net of tax			(10,601)	(3,839)
Reclassifications, net of tax			0	0
Activity, net of tax	(12,944)	2,936	(10,601)	(3,839)
Accumulated other comprehensive loss, ending balance	(18,599)	(3,945)	(18,599)	(3,945)
Other [Member]
Accumulated Other Comprehensive Loss [Line Items]
Accumulated other comprehensive loss, beginning balance			(5,288)	(5,395)
Activity before reclassifications, net of tax			0	(118)
Reclassifications, net of tax			0	(440)
Activity, net of tax	0	(92)	0	(558)
Accumulated other comprehensive loss, ending balance	$ (5,288)	$ (5,953)	$ (5,288)	$ (5,953)

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Effective income tax rate, continuing operations	38.00%	38.80%	38.00%	38.60%
Quarterly provision for income taxes, description			In determining the quarterly provision for income taxes, management uses an estimated annual effective tax rate based on forecasted annual pre-tax income, permanent tax differences, statutory tax rates and tax planning opportunities in the various jurisdictions in which the Company operates. The impact of significant discrete items is separately recognized in the quarter(s) in which they occur.
Current deferred tax assets, net	$ 9,300		$ 9,300		$ 16,300
Long-term deferred tax liabilities, net	$ 180,449		$ 180,449		$ 154,763

Segments and Related Information (Descriptions) (Narrative) (Details)	9 Months Ended
	Sep. 30, 2014 segment
Segments and Related Information [Line Items]
Segment reporting information, factors used to identify entity's reportable segments	MasTec presents its continuing operations in five reportable segments: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (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.
Number of reportable segments	5
Segment reporting information, description of products and services	All five reportable segments derive their revenues from the engineering, installation and maintenance of infrastructure, primarily in North America.
Segment reporting, description of all other segments	The Other segment primarily includes small business units that perform construction services for a variety of end markets in Mexico and elsewhere internationally.
Reportable Segments [Member] \| Communications [Member]
Segments and Related Information [Line Items]
Segment reporting information, description of products and services	The Communications segment performs engineering, construction and maintenance of communications infrastructure primarily related to wireless and wireline/fiber communications and install-to-the-home customers, and, to a lesser extent, infrastructure for electrical utilities.
Reportable Segments [Member] \| Oil and Gas [Member]
Segments and Related Information [Line Items]
Segment reporting information, description of products and services	MasTec performs engineering, construction and maintenance services on oil and natural gas pipelines and processing facilities for the energy and utilities industries through its Oil and Gas segment.
Reportable Segments [Member] \| Electrical Transmission [Member]
Segments and Related Information [Line Items]
Segment reporting information, description of products and services	The Electrical Transmission segment primarily serves the energy and utility industries through the engineering, construction and maintenance of electrical transmission lines and substations.
Reportable Segments [Member] \| Power Generation and Industrial [Member]
Segments and Related Information [Line Items]
Segment reporting information, description of products and services	The Power Generation and Industrial segment primarily serves energy, utility and other end-markets through the installation and construction of conventional and renewable power facilities, related electrical transmission infrastructure, ethanol facilities and various types of industrial infrastructure.

Segments and Related Information (Schedule of Financial Information by Reportable Segment - Revenue) (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Reportable Segments [Member] | Communications [Member]

$ 1,309,596

$ 1,269,385

$ 3,378,180

$ 3,165,657

Reportable Segments [Member] | Communications [Member] | Utilities [Member] | Customer Concentration Risk [Member] | Revenue [Member]

^[1]

$ 505,200

$ 543,000

$ 1,480,400

$ 1,464,500

Utilities customers, percentage of consolidated Communications segment revenue

7.60%

6.90%

7.00%

7.20%

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

Reportable Segments [Member] | Electrical Transmission [Member]

$ 557,400

$ 519,100

$ 1,302,900

$ 1,134,800

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

132,600

118,800

327,200

321,900

Reportable Segments [Member] | Other [Member]

114,300

85,100

263,100

237,300

1,100

3,500

6,500

9,200

Eliminations [Member]

AT&T [Member] | Communications [Member]

$ (1,000)

$ (100)

$ (1,900)

$ (2,000)

[1]

Revenue generated by utilities customers represented 7.6% and 6.9% of Communications segment revenue for the three month periods ended September 30, 2014 and 2013, respectively, and 7.0% and 7.2% of Communications segment revenue for the nine month periods ended September 30, 2014 and 2013, respectively.

Segments and Related Information (Schedule of Financial Information by Reportable Segment - EBITDA) (Details) - Continuing Operations [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segments and Related Information [Line Items]
EBITDA	$ 128.2	$ 132.1	$ 301.2	$ 308.3
Reportable Segments [Member] \| Communications [Member]
Segments and Related Information [Line Items]
EBITDA	52.4	71.8	153.7	181.6
Reportable Segments [Member] \| Oil and Gas [Member]
Segments and Related Information [Line Items]
EBITDA	73.0	68.1	143.5	161.7
Reportable Segments [Member] \| Electrical Transmission [Member]
Segments and Related Information [Line Items]
EBITDA	12.7	12.1	33.2	27.0
Reportable Segments [Member] \| Power Generation and Industrial [Member]
Segments and Related Information [Line Items]
EBITDA	4.9	(6.4)	9.4	(14.6)
Reportable Segments [Member] \| Other [Member]
Segments and Related Information [Line Items]
EBITDA	(0.3)	0.1	0.1	0.5
Corporate [Member]
Segments and Related Information [Line Items]
EBITDA	$ (14.5)	$ (13.6)	$ (38.7)	$ (47.9)

Segments and Related Information (Schedule of Financial Information by Reportable Segment - Depreciation and Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segments and Related Information [Line Items]
Depreciation and amortization	$ 41,747	$ 37,756	$ 111,996	$ 103,111
Reportable Segments [Member] \| Communications [Member]
Segments and Related Information [Line Items]
Depreciation and amortization	10,100	9,500	30,100	26,800
Reportable Segments [Member] \| Oil and Gas [Member]
Segments and Related Information [Line Items]
Depreciation and amortization	23,300	22,500	61,300	60,100
Reportable Segments [Member] \| Electrical Transmission [Member]
Segments and Related Information [Line Items]
Depreciation and amortization	5,200	3,200	11,900	8,400
Reportable Segments [Member] \| Power Generation and Industrial [Member]
Segments and Related Information [Line Items]
Depreciation and amortization	1,700	1,700	4,800	5,100
Corporate [Member]
Segments and Related Information [Line Items]
Depreciation and amortization	$ 1,400	$ 900	$ 3,900	$ 2,700

Segments and Related Information (Reconciliation of EBITDA to Consolidated Income from Continuing Operations before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Less:
Interest expense, net	$ (12,643)	$ (12,666)	$ (37,595)	$ (34,549)
Depreciation and amortization	(41,747)	(37,756)	(111,996)	(103,111)
Income from continuing operations before income taxes	73,772	81,633	151,655	170,608
Continuing Operations [Member]
Segments and Related Information [Line Items]
EBITDA	$ 128,200	$ 132,100	$ 301,200	$ 308,300

Segments and Related Information (Foreign Operations) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segments and Related Information [Line Items]
Revenue	$ 1,309,596	$ 1,269,385	$ 3,378,180	$ 3,165,657
Property and equipment, net	614,359		614,359		$ 488,132
Intangible assets and goodwill, net	1,222,100		1,222,100		1,067,700
Reportable Geographical Components [Member] \| United States [Member]
Segments and Related Information [Line Items]
Revenue	1,100,000	1,200,000	2,900,000	3,000,000
Property and equipment, net	497,600		497,600		436,900
Intangible assets and goodwill, net	1,000,000		1,000,000		1,000,000
Reportable Geographical Components [Member] \| Foreign Operations [Member]
Segments and Related Information [Line Items]
Revenue	219,400	$ 90,900	460,000	$ 172,000
Property and equipment, net	116,800		116,800		51,200
Intangible assets and goodwill, net	$ 211,500		$ 211,500		$ 92,900

Segments and Related Information (Schedule of Significant Customers, Revenue Concentration Information) (Details) - Reportable Segments [Member] - Customer Concentration Risk [Member] - Revenue [Member]

3 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Revenue, Significant Customers [Line Items]

Significant customers, percentage of total consolidated revenue

^[1]

16.00%

21.00%

18.00%

Segment reporting, disclosure of significant customers

The Company's relationship with AT&T is based upon master service agreements, other service agreements and construction/installation contracts for AT&T's wireless, wireline/fiber and home security and automation businesses. Revenue from AT&T is included in the Communications segment.

DIRECTV [Member] | Communications [Member]

Revenue, Significant Customers [Line Items]

Significant customers, percentage of total consolidated revenue

^[2]

12.00%

13.00%

15.00%

Segment reporting, disclosure of significant customers

The Company's relationship with DIRECTV® is based upon an agreement to provide installation and maintenance services for DIRECTV®. Revenue from DIRECTV® is included in the Communications segment.

Enbridge, Inc. [Member] | Oil and Gas [Member]

Revenue, Significant Customers [Line Items]

Significant customers, percentage of total consolidated revenue

^[3]

10.00%

20.00%

10.00%

14.00%

Segment reporting, disclosure of significant customers

The Company's relationship with Enbridge, Inc. is based upon various construction contracts for natural gas pipelines. Revenue from Enbridge, Inc. is included in the Oil and Gas segment.

[1]	The Company's relationship with AT&T is based upon master service agreements, other service agreements and construction/installation contracts for AT&T's wireless, wireline/fiber and home security and automation businesses. Revenue from AT&T is included in the Communications segment.
[2]	The Company's relationship with DIRECTV® is based upon an agreement to provide installation and maintenance services for DIRECTV®. Revenue from DIRECTV® is included in the Communications segment.
[3]	The Company's relationship with Enbridge, Inc. is based upon various construction contracts for natural gas pipelines. Revenue from Enbridge, Inc. is included in the Oil and Gas segment.

Commitments and Contingencies (Sunlight Entities) (Narrative) (Details) - Pending Litigation [Member] $ in Millions	1 Months Ended		9 Months Ended
	Aug. 31, 2014 USD ($)	Jun. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)
Sunlight Entities [Member]
Loss Contingencies [Line Items]
Projects or proceedings, number or quantity of			3
Litigation award, pending litigation	$ 59.6
Liens sought, pending litigation			$ 50.0
Damages sought, pending litigation		$ 60.0
Sunlight Entities [Member] \| Construction Contracts [Member]
Loss Contingencies [Line Items]
Projects or proceedings, number or quantity of			3
Sunlight General Somerset [Member]
Loss Contingencies [Line Items]
Contract price, pending litigation			$ 29.0
Sunlight General Morris [Member]
Loss Contingencies [Line Items]
Contract price, pending litigation			36.0
Sunlight General Sussex [Member]
Loss Contingencies [Line Items]
Contract price, pending litigation			$ 26.0

Commitments and Contingencies (Other Commitments and Contingencies) (Narrative) (Details) - USD ($)	Sep. 30, 2014	Dec. 31, 2013
Uninsured Risk [Member] \| Workers Compensation, General And Automobile Policies [Member]
Commitments and Contingencies [Line Items]
Self insurance reserve	$ 60,300,000	$ 50,800,000
Uninsured Risk [Member] \| Workers Compensation, General And Automobile Policies [Member] \| Other Non-Current Liabilities [Member]
Commitments and Contingencies [Line Items]
Self insurance reserve, non-current	36,300,000	31,300,000
Uninsured Risk [Member] \| Workers Compensation, General And Automobile Policies [Member] \| Other Non-Current Assets [Member]
Commitments and Contingencies [Line Items]
Cash collateral held by insurance carriers	1,100,000	1,400,000
Uninsured Risk [Member] \| Group Insurance Policies [Member] \| Medical Insurance [Member]
Commitments and Contingencies [Line Items]
Self insurance reserve	1,900,000	2,100,000
Unconsolidated Affiliates [Member] \| Financial Support [Member]
Commitments and Contingencies [Line Items]
Unconsolidated affiliates, outstanding commitments	0
Performance Guarantee [Member]
Commitments and Contingencies [Line Items]
Outstanding bonds, amount	748,600,000	1,100,000,000
Performance Guarantee [Member] \| Projected Estimate [Member]
Commitments and Contingencies [Line Items]
Bonded projects, costs to complete	53,100,000	297,100,000
Financial Guarantee [Member] \| Uninsured Risk [Member] \| Workers Compensation, General And Automobile Policies [Member]
Commitments and Contingencies [Line Items]
Letters of credit, outstanding amount	57,200,000	57,400,000
Surety Bond [Member] \| Uninsured Risk [Member] \| Workers Compensation [Member]
Commitments and Contingencies [Line Items]
Outstanding bonds, amount	13,000,000	10,900,000
Credit Facility [Member]
Commitments and Contingencies [Line Items]
Letters of credit, outstanding amount	$ 135,600,000	$ 134,800,000

Commitments and Contingencies (Collective Bargaining Agreements and Multi-Employer Plans) (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2014	Nov. 15, 2011
Loss Contingencies [Line Items]
Multi-employer plans, collective bargaining agreements, 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 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.
Multi-Employer Plans, Pension [Member] \| Central States Southeast And Southwest Areas Pension Fund [Member]
Loss Contingencies [Line Items]
Withdrawal liability	$ 4.5	$ 6.4
Multi-Employer Plans, Pension [Member] \| Withdrawal from Multi-Employer Defined Benefit Plan [Member] \| Central States Southeast And Southwest Areas Pension Fund [Member]
Loss Contingencies [Line Items]
Loss contingency, evaluation of estimated loss	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 that is in critical status. In connection with this withdrawal, a $6.4 million withdrawal liability was established based on an estimate provided by the Central States administrator of such liability as of the date of withdrawal. The Company began paying installments towards this withdrawal liability in 2013, of which $4.5 million was outstanding as of September 30, 2014. The Company withdrew from Central States in order to mitigate its liability in connection with the plan; however, Central States has asserted that the PLCA members did not effectively withdraw in 2011 and are, therefore, responsible for a withdrawal liability that includes 2011 contribution amounts. By letter dated March 14, 2013, Central States demanded $11 million in withdrawal liability from the Company, which included 2011 contribution amounts. The Company is vigorously opposing this demand because it believes that it legally and effectively withdrew from Central States on November 15, 2011. If Central States were to prevail in its assertion that the Company withdrew after that date, then the initial amount of the Company’s withdrawal liability would increase to approximately $11 million.
Maximum loss	$ 11.0

Commitments and Contingencies (Other Guarantees) (Narrative) (Details)	9 Months Ended
	Sep. 30, 2014
Other Guarantees [Line Items]
General warranty, description	MasTec generally warrants the work it performs for a one to two year period following substantial completion of a project.
Warranty [Member] \| Minimum [Member]
Other Guarantees [Line Items]
General warranty, period	1 year
Warranty [Member] \| Maximum [Member]
Other Guarantees [Line Items]
General warranty, period	2 years
Subsidiary [Member]
Other Guarantees [Line Items]
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.

Commitments and Contingencies (Concentrations of Risk) (Narrative) (Details) - customer	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Concentration Risk [Line Items]
Number of customers			480
Ten Largest Customers [Member] \| Customer Concentration Risk [Member] \| Revenue [Member]
Concentration Risk [Line Items]
Number of customers	10	10	10	10
Significant customers, percentage of total consolidated revenue	64.00%	73.00%	66.00%	69.00%

Related Party Transactions (Investments) (Narrative) (Details) - Cross Country Pipeline [Member] - Management [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013
Cost Method Investment [Member]
Related Party Transaction [Line Items]
Cost method investment, original cost			$ 15.0
Lease And Rental Agreements [Member] \| Equipment [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 1.9	$ 4.6

Related Party Transactions (Other Related Party Transactions) (Narrative) (Details) - Management [Member] - Related Customer [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Employee Leasing Arrangements [Member]
Related Party Transaction [Line Items]
Charges to related party	$ 0.2	$ 0.1	$ 0.5	$ 0.4
Due from related party	0.1		0.1		$ 0.1
Satellite Communication Services [Member]
Related Party Transaction [Line Items]
Revenue from related party	0.3	$ 0.4	0.8	$ 1.0
Accounts receivable, related party	$ 0.4		$ 0.4		$ 0.4

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.