Income Tax Disclosure [Abstract] Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Condensed Financial Statements, Supplemental Guarantor Information [Abstract] -- None. No documentation exists for this element. -- Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) Condensed Income Statement [Table Text Block] Condensed Consolidating Balance Sheets Condensed Balance Sheet [Table Text Block] Condensed Consolidating Statements of Cash Flows Condensed Cash Flow Statement [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Non-Recurring [Table] Fair Value, Recurring and Nonrecurring [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Waha JVs [Member] Waha JVs [Member] Trans-Pecos Pipeline, LLC ("TPP") (business name) and Comanche Trail Pipeline, LLC ("CTP") (business name), together referred to as the "Waha JVs". Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Equity Investee [Member] Investee [Member] Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Number of pipelines in operation Number Of Pipelines In Operation Number of pipelines in operation at the balance sheet date. Equity method investments, equity contributions Payments to Acquire Equity Method Investments Equity method investments, equity in earnings Income (Loss) from Equity Method Investments Equity method investments, cumulative undistributed earnings Retained Earnings, Undistributed Earnings from Equity Method Investees Equity method investments, distributions of earnings received, operating cash flows Proceeds from Equity Method Investment, Distribution Equity method investments, net investment Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Revenue, related parties Revenue from Related Parties Unrealized gains (losses) on equity investee activity, before tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Unrealized gains (losses) on equity investee activity, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] CCI [Member] Cross Country Infrastructure [Member] Cross Country Infrastructure Services, Inc. ("CCI") (business name). Equity method investment, ownership percentage Equity Method Investment, Ownership Percentage Equity investments, adjusted cost basis, amount Equity Securities without Readily Determinable Fair Value, Amount Equity investments, carrying value Equity investments, impairments Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Income Taxes Income Tax Disclosure [Text Block] Receivables [Abstract] Schedule of Accounts Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Receivables, Non-Recourse Arrangement [Member] Financing Receivable [Member] Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Retainage, percentage of contract billings Retainage, Percent Of Contract Billings Percentage of contract billings that a customer is permitted to retain until the final contract settlement because of retainage provisions in a contract. Retainage, expected collection period (in years) Retainage, Expected Collection, Period Period in which billed retainage amounts are expected to be collected, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Provision for doubtful accounts Accounts Receivable, Credit Loss Expense (Reversal) Amounts charged against the allowance Accounts Receivable, Allowance for Credit Loss, Writeoff Contract liabilities Contract with Customer, Liability, Current Contract with customer liability deferred revenue current Contract With Customer Liability Deferred Revenue Current Amount of obligation, excluding accrued projected losses, on transfer good or service to customer for which consideration has been received or is receivable, classified as current. Deferred revenue, revenue recognized Contract with Customer, Liability, Revenue Recognized Non-recourse financing agreement, discount charge Interest Revenue (Expense), Net Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Management [Member] Management [Member] Executive Officers [Member] Executive Officer [Member] Chairman, Board of Directors [Member] Board of Directors Chairman [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Subcontracting Arrangements [Member] Subcontracting Arrangements [Member] The performance of services under a subcontracting arrangement. Leases [Member] Lease Agreements [Member] Construction Services [Member] Construction Services [Member] Construction services. Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Related Customer [Member] Related Customer [Member] Customer that has a related party relationship with the entity, either by ownership or management affiliation. Related Party Transaction [Line Items] Related Party Transaction [Line Items] Number of additional management employees, subcontracting arrangement Entity Number of Employees Payments or amounts incurred, related party Related Party Transaction, Expenses from Transactions with Related Party Payables, related party Accounts Payable, Related Parties Revenue, related party Receivables, related party Accounts Receivable, Related Parties Charges, related party Related Party Transaction, Other Revenues from Transactions with Related Party Share-based Payment Arrangement [Abstract] Defined Contribution Plan [Abstract] 401(k) plan, maximum pre-tax annual contribution per employee, percentage of annual compensation Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 401(k) plan, employer matching contribution (in dollars) Defined Contribution Plan, Cost Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Reportable Legal Entities [Member] Reportable Legal Entities [Member] Eliminations [Member] Consolidation, Eliminations [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] MasTec, Inc. [Member] Parent Company [Member] Guarantor Subsidiaries [Member] Guarantor Subsidiaries [Member] Non-Guarantor Subsidiaries [Member] Non-Guarantor Subsidiaries [Member] Condensed Consolidating Statements of Cash Flows [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Cash paid for acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Capital expenditures Payments to Acquire Productive Assets Proceeds from sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Payments for other investments Payments to Acquire Other Investments Proceeds from other investments Proceeds from Sale and Maturity of Other Investments Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from credit facilities Proceeds from Long-term Lines of Credit Repayments of credit facilities Repayments of Long-term Lines of Credit Repayments of other borrowings, net Proceeds from (Repayments of) Other Long-term Debt Payments of finance lease obligations Finance Lease, Principal Payments Payments of acquisition-related contingent consideration Payment for Contingent Consideration Liability, Financing Activities Distributions to (proceeds from) non-controlling interests Proceeds from (Payments to) Noncontrolling Interests Proceeds from stock-based awards Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised Payments for stock-based awards Payment, Tax Withholding, Share-based Payment Arrangement Repurchases of common stock Payments for Repurchase of Common Stock Other financing activities, net Proceeds from (Payments for) Other Financing Activities Net financing activities and advances from (to) consolidated affiliates Net Financing Activities And Advances From (To) Consolidated Affiliates The cash inflow (outflow) from financing activities and (advances to) collection of money previously advanced to consolidated entities. Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Effect of currency translation on cash Effect of Exchange Rate on Cash and Cash Equivalents Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents - beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents - end of period Equipment, Supplies And Services [Member] Equipment, Supplies And Services [Member] Purchases, rentals and lease of equipment and purchases of various types of supplies and services. Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Oil And Gas 2017 Acquisition [Member] Oil And Gas 2017 Acquisition [Member] Oil and Gas acquisition completed in 2017. Payments, related party Business combinations, cash paid Payments to Acquire Businesses, Gross Contingent consideration, earn-out liability Business Combination, Contingent Consideration, Liability Multiemployer Plans [Abstract] Schedule of Multiemployer Plans [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Workforce Subject to Collective Bargaining Arrangements [Member] Workforce Subject to Collective Bargaining Arrangements [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Unionized Employees [Member] Unionized Employees Concentration Risk [Member] Multiemployer Plan Type [Axis] Multiemployer Plan Type [Axis] Multiemployer Plans Type [Domain] Multiemployer Plans Type [Domain] Multiemployer Plans, Pension [Member] Multiemployer Plans, Pension [Member] Multiemployer Plans, Other Multiemployer [Member] Multiemployer Plans, Postretirement Benefit [Member] Low [Member] High [Member] Covered Employees and Contributions, Multiemployer Plans [Line Items] Multiemployer Plans [Line Items] Multiemployer plans, covered employees (in number of employees) EntityNumberOfEmployeesDuringPeriod Number of employees employed by the entity over a period of time. Multiemployer plans, contributions (in dollars) Multiemployer Plan, Contributions by Employer Business Combinations [Abstract] Business combinations, unaudited supplemental pro forma revenue Business Acquisition, Pro Forma Revenue Business combinations, unaudited supplemental pro forma net income Business Acquisition, Pro Forma Net Income (Loss) Business combinations, consolidated acquisition-related revenue Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Business combinations, consolidated acquisition-related net income Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Oil and Gas [Member] Oil And Gas 1 [Member] Engineering, construction and maintenance services for oil and natural gas pipelines and processing facilities for the energy and utilities industries. Communications [Member] Communications [Member] Engineering, construction, maintenance and customer fulfillment activities related to communications infrastructure primarily for wireless and wireline/fiber communications and install-to-the-home customers, and, to a lesser extent, infrastructure for utilities, among others. Power Generation and Industrial [Member] Power Generation and Industrial [Member] Installation and construction of power facilities, including renewables, related electrical transmission infrastructure, ethanol/biofuel facilities and various types of heavy civil and industrial infrastructure, primarily for the energy, utility and other end-markets. 2019 Acquisitions [Member] 2019 Acquisitions [Member] Acquisitions completed during the year 2019. Measurement Input Type [Axis] Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Expected Term [Member] Measurement Input, Expected Term [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer Relationships [Member] Customer Relationships [Member] Backlog [Member] Order or Production Backlog [Member] Other Amortizing Intangible Assets [Member] Other Intangible Assets [Member] Business Combinations [Line Items] Business Acquisition [Line Items] Business combinations, number of acquisitions Number of Businesses Acquired Business combinations, percentage of interests acquired Business Acquisition, Percentage of Voting Interests Acquired Business combinations, acquired finite-lived intangible assets, weighted average lives (in years) Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Business combinations, goodwill, expected tax deductible amount Business Acquisition, Goodwill, Expected Tax Deductible Amount Business combination, liabilities assumed, amounts due to former owners Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Amounts due to former owners, subsequently paid Business combinations, contingent consideration, earn-out liabilities Business combinations, contingent consideration, mandatorily redeemable non-controlling interest Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Business combinations, contingent consideration, earn-out period (in years) Business Combination, Contingent Consideration, Liability, Measurement Input Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Accounting Policies [Abstract] Goodwill and Intangible Assets [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Electrical Transmission [Member] Electrical Transmission [Member] The engineering, construction and maintenance of electrical transmission lines and substations, primarily for the energy and utility industries. Other [Member] Other Segments [Member] Terminal Growth Rate [Member] Measurement Input, Long-term Revenue Growth Rate [Member] Number of Years of Discounted Cash Flows [Member] Number Of Years Of Discounted Cash Flows [Member] Measurement input using the number of years for which projections are incorporated into a cash flow analysis before the terminal year value is estimated in connection with impairment testing. Discount Rate [Member] Measurement Input, Discount Rate [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Goodwill [Member] Goodwill [Member] Subsegments [Axis] Subsegments [Axis] Subsegments [Domain] Subsegments [Domain] Reporting Unit A, Quantitative Testing [Member] Reporting Unit A [Member] The reporting unit A for which quantitative testing was performed. Reporting Unit B, Quantitative Testing [Member] Reporting Unit B [Member] The reporting unit B for which quantitative testing was performed. Reporting Unit Or Intangible For Which Impairment Charge Was Recorded [Member] Reporting Unit Or Intangible For Which Impairment Charge Was Recorded [Member] The reporting unit or indefinite lived intangible asset for which an impairment charge was recorded. Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Pre-Qualifications [Member] Contractual Rights [Member] Goodwill and Indefinite-Lived Intangible Assets [Line Items] Indefinite-lived Intangible Assets [Line Items] Percentage of aggregated components in reporting unit Goodwill Impairment Testing Percentage Of Components Aggregated For a business entity, represents the percentage of components of an operating segment that were aggregated into a reporting unit for purposes of goodwill impairment review or testing. Number of aggregated components in reporting unit Goodwill Impairment Testing, Number Of Components Aggregated For a business entity, represents the number of components of an operating segment that were aggregated into a reporting unit for purposes of goodwill impairment review or testing. Goodwill impairment testing, number of reporting units Number of Reporting Units Goodwill impairment testing, measurement input Goodwill Impairment Testing, Measurement Input Value of input used in goodwill impairment testing. Goodwill, carrying amount (in dollars) Goodwill Goodwill impairment testing, reporting unit, percentage of estimated fair value in excess of carrying value Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount Impairment testing, discount rate sensitivity analysis, spread on discount rate for which evaluation was completed (percentage) Impairment Testing, Discount Rate Sensitivity Analysis, Spread On Discount Rate For Which Evaluation Was Completed For sensitivity analysis purposes, represents the percentage points added to or deducted from the discount rate used in a discounted cash flow analysis in connection with impairment testing. Goodwill, pre-tax impairment charge Goodwill, Impairment Loss Indefinite-lived intangible assets, impairment testing, measurement input Indefinite-Lived Intangible Assets Impairment Testing, Measurement Input Value of input used in impairment testing for indefinite-lived intangible assets. Impairment of Intangible Assets (Excluding Goodwill) Impairment of Intangible Assets (Excluding Goodwill) Indefinite-lived intangible assets, carrying amount (in dollars) Indefinite-lived Intangible Assets (Excluding Goodwill) Indefinite-lived intangible assets impairment testing, percentage of estimated fair value in excess of carrying value Indefinite-Lived Intangible Asset Percentage Of Fair Value In Excess Of Carrying Amount Percentage of fair value of indefinite-lived intangible asset in excess of carrying amount. Pensare [Member] Pensare [Member] Pensare Acquisition Corp. ("Pensare") (business name) Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Common Stock [Member] Common Stock [Member] Scenario [Axis] Scenario [Axis] Scenario [Domain] Scenario [Domain] Plan [Member] Scenario, Plan [Member] Equity investment and warrants, amount paid (in dollars) Payments to Acquire Long-term Investments Equity investment, ownership percentage Equity Investment Without Readily Determinable Fair Value, Ownership Percentage The percentage of ownership of common stock or equity participation in an investee which does not have a readily determinable fair value. Excludes proportionately consolidated investees and investees accounted for under the equity method of accounting. Derivative instruments, number held Derivative, Number of Instruments Held Investment, restriction period (in years) Investment Restriction Period Period of restriction related to the sale or transfer of an investment, after the completion of a business combination by the investee. Warrants, exercise price (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Number of entities Number Of Entities Number of entities. Joint Venture [Member] Corporate Joint Venture [Member] Currency [Axis] Currency [Axis] All Currencies [Domain] All Currencies [Domain] Canadian Dollars [Member] Canada, Dollars Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Performance Guarantees [Member] Performance Guarantee [Member] Proportionately consolidated non-controlled joint venture, ownership percentage Proportionately Consolidated Joint Venture Ownership Percentage The percentage interest in a proportionately consolidated joint venture. Guarantees issued, related party Guarantor Obligations, Maximum Exposure, Undiscounted Debt Disclosure [Abstract] Long-term Debt and Lease Obligation, Including Current Maturities [Abstract] Long-term Debt and Lease Obligation, Including Current Maturities [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-Term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Credit Facility [Member] Domestic Line of Credit [Member] Senior Notes [Member] Senior Notes [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Loans [Member] Revolving Credit Facility [Member] Term Loan [Member] Loans Payable [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 4.875% Senior Notes [Member] Four Point Eight Seven Five Percent Senior Notes [Member] 4.875% Senior Notes Debt Instrument [Line Items] Debt Instrument [Line Items] Line of credit facility, maturity date Line of Credit Facility, Expiration Date Long-term debt obligations Long-term Debt, Gross Debt instrument, interest rate (percentage) Debt Instrument, Interest Rate, Stated Percentage Debt instrument, maturity date Debt Instrument, Maturity Date Finance lease and other obligations Finance Lease And Other Obligations The carrying amount as of the balance sheet date for the aggregate of finance lease and other obligations. Finance lease obligations represents the present value of lessee's discounted obligation for lease payments from finance leases. Other obligations represents the carrying amount of debt obligations classified as other. Total long-term debt obligations Long-term Debt and Finance Lease Obligations, Including Current Maturities, Gross Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt and finance lease obligations including current maturities. Less unamortized deferred financing costs Debt Issuance Costs, Net Total debt, net of deferred financing costs Long-term Debt and Lease Obligation, Including Current Maturities Current portion of long-term debt Long-term Debt and Lease Obligation, Current Long-term debt Long-term Debt and Lease Obligation Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Revenue [Table] Revenue from External Customers by Products and Services [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU 2014-09 [Member] Accounting Standards Update 2014-09 [Member] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Domain] Initial Application Period Cumulative Effect Transition [Domain] Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Revenue Benchmark [Member] Revenue Benchmark [Member] Concentration Risk from Type of Arrangement [Member] Product Concentration Risk [Member] Type of Agreement [Axis] Product and Service [Axis] Type of Agreement [Domain] Product and Service [Domain] Master Service and Other Service Agreements [Member] Master Service And Other Service Agreements [Member] Master service and other service agreements. Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Point in Time [Member] Transferred at Point in Time [Member] Revenue [Line Items] Revenue from External Customer [Line Items] Retained earnings, cumulative effect recognized on intial application of the new guidance (in dollars) Retained Earnings (Accumulated Deficit) Concentration risk, percentage of total Concentration Risk, Percentage Revenue recognition, changes in contract estimates, cost-to-cost method, financial effect, percentage Changes In Contract Estimates, Cost-To-Cost Measure Of Progress, Financial Effect, Percentage Disclosure of the percentage effect on project profit (defined as project revenue less project costs of revenue, including depreciation) during the reporting period of changes in contract estimates for projects that were in process as of the end of the prior year and are accounted for under the cost-to-cost method. Revenue recognition, performance obligations satisfied in previous periods, revenue recognized (in dollars) Contract with Customer, Performance Obligation Satisfied in Previous Period Contract with customer, unapproved change orders and/or claims, amount (in dollars) Contracts Receivable, Claims and Uncertain Amounts, Expected to be Collected in Next Twelve Months Change order or claim approval process, term within which expected to be completed (in years) Unapproved Change Orders And/Or Claims, Expected Term For Approval Expected length of time within which an unapproved change order or claim is approved by the customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Equity [Abstract] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Rollforward of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Lifeshield [Member] Lifeshield [Member] Lifeshield, LLC ("Lifeshield") (Business name) Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] Fair value investment, carrying amount Equity Securities, FV-NI Fair value investment, ownership percentage Equity Investment Fv-Ni, Ownership Percentage The percentage ownership of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Other investment, proceeds U.S. statutory federal rate applied to pretax income Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State and local income taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Foreign tax rate differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Non-deductible expenses Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Goodwill and intangible assets EffectiveIncomeTaxRateReconciliationGoodwillAndIntangibleAssets Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible (deductible) amounts for goodwill and intangible assets. Change in tax rate Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Domestic production activities deduction Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Percent Stock basis adjustment Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent Valuation allowance for deferred tax assets Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Leases [Abstract] Schedule of Future Minimum Lease Commitments, Finance Leases Finance Lease, Liability, Maturity [Table Text Block] Schedule of Future Minimum Lease Commitments, Operating Leases Lessee, Operating Lease, Liability, Maturity [Table Text Block] Cover page. Document Type Document Type Document Annual Report Document Annual Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Public Float (in dollars) Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Amortization expense, intangible assets Amortization of Intangible Assets Goodwill [Line Items] Goodwill [Line Items] Goodwill, gross Goodwill, Gross Goodwill, accumulated impairment loss Goodwill, Impaired, Accumulated Impairment Loss Goodwill, net Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill, net, beginning balance Additions from new business combinations Goodwill, Acquired During Period Measurement period adjustments, net Goodwill, Purchase Accounting Adjustments Goodwill impairment Currency translation adjustments Goodwill, Foreign Currency Translation Gain (Loss) Goodwill, net, ending balance Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] State [Member] State and Local Jurisdiction [Member] Foreign [Member] Foreign Tax Authority [Member] Federal [Member] Domestic Tax Authority [Member] Income Taxes [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Net operating loss carryforwards, deferred tax assets Deferred Tax Assets, Operating Loss Carryforwards U.S. corporate tax rate, percent Tax cuts and jobs act, income tax expense (benefit) Tax Cuts and Jobs Act, Income Tax Expense (Benefit) Unrecognized tax benefits, accrued interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Unrecognized tax benefits, interest and penalties, income tax expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Unrecognized tax benefits Unrecognized Tax Benefits that Would Impact Effective Tax Rate Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies [Table] Loss Contingencies [Table] Nature of Expense [Axis] Nature of Expense [Axis] Interim Period, Costs Not Allocable [Domain] Interim Period, Costs Not Allocable [Domain] Legal Fees [Member] Legal Fees [Member] Reimbursement of legal fees. Interest Expense [Member] Interest Expense [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Canadian Acquisition Arbitration [Member] Canadian Acquisition Arbitration [Member] Canadian acquisition arbitration. Performance and Payment Bonds [Member] Financial Guarantees [Member] Financial Standby Letter of Credit [Member] Surety Bonds [Member] Surety Bond [Member] Subsidiaries [Member] Subsidiaries [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Self-Insurance [Member] Uninsured Risk [Member] Insurance Policies By Type [Axis] Insurance Policies By Type [Domain] Workers' Compensation, General and Automobile Policies [Member] Property, Liability and Casualty Insurance Product Line [Member] Employee Group Medical Claims Policy [Member] Group Insurance Policy [Member] Workers' Compensation [Member] Accident and Health Insurance Product Line [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Long-Term Liabilities [Member] Other Noncurrent Liabilities [Member] Other Long-Term Assets [Member] Other Noncurrent Assets [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Favorable arbitration award Litigation Settlement, Amount Awarded from Other Party Collection of arbitration award Proceeds from Legal Settlements Letters of credit issued Letters of Credit Outstanding, Amount Outstanding bonds, amount Bonded projects, estimated costs to complete Estimated Costs To Complete Projects Secured By Bonds Reflects the amount of estimated costs to complete projects that are secured by outstanding performance and/or payment bonds as of the balance sheet date. Self-insurance reserve Self Insurance Reserve Self-insurance reserve, non-current Self Insurance Reserve, Noncurrent Cash collateral held by insurance carriers Deposit Assets Other Credit Facilities [Member] Foreign Line of Credit [Member] Line of Credit [Member] Line of Credit [Member] Letter of Credit [Member] Letter of Credit [Member] Standby Letters of Credit [Member] Standby Letters of Credit [Member] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Long-term debt obligations Line of credit facility, interest rate (percentage) Line of Credit Facility, Interest Rate at Period End Schedule of Stock-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2013 Incentive Plan [Member] 2013 Incentive Plan [Member] The MasTec, Inc. 2013 Incentive Compensation Plan ("2013 Incentive Plan"). ESPPs [Member] Employee Stock Plans [Member] The MasTec, Inc. Bargaining Units Employee Stock Purchase Plan (the “2013 Bargaining Units ESPP”) and the MasTec, Inc. 2011 Amended and Restated Employee Stock Purchase Plan as amended (the “2011 ESPP”), together known as the “ESPPs”. Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Restricted Shares [Member] Restricted Stock And Restricted Stock Units [Member] Stock including a provision that prohibits sale or substantive sale of an equity instrument for a specified period of time or until specified performance conditions are met ("Restricted Stock") or share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met ("Restricted Stock Units"). Restricted Stock Awards and Restricted Stock Units are together referred to as "Restricted Shares". Employee Stock Purchase Plans [Member] Employee Stock [Member] Stock-Based Compensation and Other Employee Benefit Plans [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock-based compensation plans, number of shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Stock-based compensation plans, number of shares available for future grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Non-cash stock-based compensation expense Share-based Payment Arrangement, Expense Stock-based compensation, income tax benefits Share-based Payment Arrangement, Expense, Tax Benefit Stock-based compensation, vested awards, net income tax benefits Employee Service Share-Based Compensation, Net Tax Benefit (Deficiency) From Vesting Of Share-Based Payment Awards Amount of net tax benefit (deficiency) from vesting of share-based payment awards. Quarterly Financial Information Disclosure [Abstract] Quarterly Information (Unaudited) Quarterly Financial Information [Text Block] Operating Leases [Table] Schedule of Operating Leased Assets [Table] Prospective Adoption of New Accounting Pronouncements [Axis] Prospective Adoption of New Accounting Pronouncements [Axis] Accounting Guidance [Domain] Accounting Guidance [Domain] ASU 2016-02 [Member] Accounting Standards Update 2016-02 [Member] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Domain] Lease Arrangement, Type [Domain] Lease Terms in Excess of One Year [Member] Lease Term In Excess Of One Year [Member] Lease term in excess of one year. Lease Terms of One Year or Less [Member] Lease Term Less Than One Year [Member] Lease term of one year or less. Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Operating lease assets Operating Lease, Right-of-Use Asset Operating leases, additions Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Operating leases, term of contract (in years) Lessee, Operating Lease, Term of Contract Operating leases, expense Operating Lease, Expense Operating leases, variable lease costs Variable Lease, Cost Operating leases, short-term leases, expense Short-term Lease, Cost Operating leases, rent and related expense Operating Leases, Rent Expense, Net Statement of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Accounts receivable, net of allowance Accounts Receivable, after Allowance for Credit Loss, Current Contract assets Contract with Customer, Asset, Net, Current Inventories, net Inventory, Net Prepaid expenses Prepaid Expense, Current Other current assets Other Assets, Current Total current assets Assets, Current Property and equipment, net Property, Plant and Equipment, Net Goodwill, net Other intangible assets, net Intangible Assets, Net (Excluding Goodwill) Other long-term assets Other Assets, Noncurrent Total assets Assets Liabilities and equity Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Current portion of long-term debt, including finance leases Current portion of operating lease liabilities Operating Lease, Liability, Current Accounts payable Accounts Payable, Current Accrued salaries and wages Employee-related Liabilities, Current Other accrued expenses Accrued Liabilities, Current Other current liabilities Other Liabilities, Current Total current liabilities Liabilities, Current Long-term debt, including finance leases Long-term operating lease liabilities Operating Lease, Liability, Noncurrent Deferred income taxes Deferred Income Tax Liabilities, Net Other long-term liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 14) Commitments and Contingencies Equity Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $1.00 par value: authorized shares - 5,000,000; issued and outstanding shares – none Preferred Stock, Value, Issued Common stock, $0.10 par value: authorized shares - 145,000,000; issued shares - 91,909,430 and 91,327,009 (including 1,221,593 and 1,251,533 of unvested stock awards) as of December 31, 2019 and 2018, respectively Common Stock, Value, Issued Capital surplus Additional Paid in Capital, Common Stock Retained earnings Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Treasury stock, at cost: 15,344,917 shares and 15,329,817 shares as of December 31, 2019 and 2018, respectively Treasury Stock, Common, Value Total MasTec, Inc. shareholders’ equity Stockholders' Equity Attributable to Parent Non-controlling interests Stockholders' Equity Attributable to Noncontrolling Interest Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and equity Liabilities and Equity Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Condensed Consolidating Balance Sheets [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Total current assets Goodwill and other intangible assets, net Intangible Assets, Net (Including Goodwill) Investments in and advances to consolidated affiliates, net Due from Affiliate, Noncurrent Total current liabilities Advances from consolidated affiliates, net Due to Affiliate, Noncurrent Long-term operating lease liabilities Other long-term liabilities Liabilities, Other than Long-term Debt, Noncurrent Total equity Related Party Transactions Related Party Transactions Disclosure [Text Block] Deferred Compensation Arrangements [Abstract] Deferred Compensation Arrangements [Abstract] Deferred compensation plans, assets Deferred Compensation Plan Assets Deferred compensation plans, liabilities Deferred Compensation Liability, Classified, Noncurrent Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Construction Management Firm Specializing in Steel Building Systems [Member] Construction Management Firm Specializing In Steel Building Systems [Member] A construction management firm specializing in steel building systems. Immediate Family Member of Management [Member] Immediate Family Member of Management or Principal Owner [Member] Equipment [Member] Equipment [Member] Financing or amounts advanced, related party Payments for Advance to Affiliate Payments, net of rebates, related party Related Party Transaction, Amounts of Transaction Rebates Receivables, Related Parties Rebates Receivables, Related Parties Rebates receivables from related parties. Schedule of Components of Income before Income Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Schedule of Provision for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Effective Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Rollforward of Uncertain Tax Positions Summary of Income Tax Contingencies [Table Text Block] Segment Reporting [Abstract] Segments and Related information [Table] Schedule of Segment Reporting Information, by Segment [Table] Reportable Segments [Member] Operating Segments [Member] Corporate [Member] Corporate, Non-Segment [Member] Segment and Related Information [Line Items] Segment Reporting Information [Line Items] Depreciation and Amortization: Depreciation, Depletion and Amortization [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Schedule Of Other Intangible Assets [Table] ScheduleOfIntangibleAssets [Table] Schedule of intangible assets, excluding goodwill. Non-Amortizing Intangible Assets [Axis] Non-Amortizing Intangible Assets, Major Class Name [Domain] Trade Names [Member] Trade Names [Member] Amortizing Intangible Assets by Major Class [Axis] Amortizing Intangible Assets, Major Class Name [Domain] Customer Relationships and Backlog [Member] Customer-Related Intangible Assets [Member] Weighted Average [Member] Weighted Average [Member] Other Intangible Assets [Line Items] Intangible Assets [Line Items] Line items for intangible assets, excluding goodwill. Other intangible assets, non-amortizing Other intangible assets, amortizing, gross Finite-Lived Intangible Assets, Gross Other intangible assets, gross Intangible Assets, Gross (Excluding Goodwill) Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Other Intangible Assets [Roll Forward] Intangible Assets (Excluding Goodwill) [Roll Forward] Rollforward of intangible assets, excluding goodwill. Other intangible assets, non-amortizing, beginning balance Other intangible assets, net, amortizing, beginning balance Finite-Lived Intangible Assets, Net Other intangible assets, net, beginning balance Additions from new business combinations, non-amortizing intangible assets Indefinite-lived Intangible Assets Acquired Additions from new business combinations, amortizing intangible assets Finite-lived Intangible Assets Acquired Additions from new business combinations Intangible Assets Acquired, Gross (Excluding Goodwill) Amount of increase in intangible assets, excluding goodwill, from an acquisition. Measurement period adjustments, non-amortizing intangible assets Indefinite-lived Intangible Assets, Purchase Accounting Adjustments Measurement period adjustments, amortizing intangible assets Finite-Lived Intangible Assets, Purchase Accounting Adjustments Measurement period adjustments Intangible Assets Excluding Goodwill, Purchase Accounting Adjustments Intangible Assets Excluding Goodwill, Purchase Accounting Adjustments Intangible asset impairment, non-amortizing intangible assets Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) Intangible asset impairment, amortizing intangible assets Impairment of Intangible Assets, Finite-lived Intangible asset impairment Amortization expense Currency translation adjustments, non-amortizing intangible assets Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss) Currency translation adjustments, amortizing intangible assets Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) Currency translation adjustments Intangible Assets, Gross (Excluding Goodwill), Translation Adjustments Amount of foreign currency translation gain (loss) which increases (decreases) intangible assets, excluding goodwill. Other intangible assets, non-amortizing, ending balance Other intangible assets, net, amortizing, ending balance Other intangible assets, net, ending balance Remaining weighted average amortization period (in years) Finite-Lived Intangible Assets, Remaining Amortization Period Segments and Related Information Segment Reporting Disclosure [Text Block] Revenue recognition, remaining performance obligations, contract price allocated (in dollars) Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue recognition, remaining performance obligations, completion period (in years) Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Quarterly Financial Information [Table] Interim Period, Costs Not Allocable [Table] Quarterly Financial Information [Line Items] Interim Period, Costs Not Allocable [Line Items] Intangible asset, pre-tax impairment charge Project gains Project Gains Projects gains are defined as project revenue, less project costs of revenue, including project-related depreciation, in particular, on construction contracts accounted for under the cost-to-cost method, for which the recorded amounts require estimates of costs to complete. Stock-based compensation, net excess tax benefits Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Change in tax rate, non-cash tax (expense) benefit Finance Leases Capital Lease Obligations [Abstract] 2020 Finance Lease, Liability, Payments, Due Next Twelve Months 2021 Finance Lease, Liability, Payments, Due Year Two 2022 Finance Lease, Liability, Payments, Due Year Three 2023 Finance Lease, Liability, Payments, Due Year Four 2024 Finance Lease, Liability, Payments, Due Year Five Thereafter Finance Lease, Liability, Payments, Due after Year Five Total minimum lease payments Finance Lease, Liability, Payment, Due Less amounts representing interest Finance Lease, Liability, Undiscounted Excess Amount Total lease obligations, net of interest Finance Lease, Liability Less current portion Finance Lease, Liability, Current Long-term portion of lease obligations, net of interest Finance Lease, Liability, Noncurrent Operating Leases Leases, Operating [Abstract] 2020 Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three 2023 Lessee, Operating Lease, Liability, Payments, Due Year Four 2024 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total minimum lease payments Lessee, Operating Lease, Liability, Payments, Due Less amounts representing interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Total lease obligations, net of interest Operating Lease, Liability Less current portion Contractual Maturities of Debt and Finance Lease Obligations Maturities of Long-term Debt [Abstract] Contractual maturities of debt and finance lease obligations, 2020 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Contractual maturities of debt and finance lease obligations, 2021 Long-term Debt, Maturities, Repayments of Principal in Year Two Contractual maturities of debt and finance lease obligations, 2022 Long-term Debt, Maturities, Repayments of Principal in Year Three Contractual maturities of debt and finance lease obligations, 2023 Long-term Debt, Maturities, Repayments of Principal in Year Four Contractual maturities of debt and finance lease obligations, 2024 Long-term Debt, Maturities, Repayments of Principal in Year Five Contractual maturities of debt and finance lease obligations, thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Stock-based compensation awards, unearned compensation Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Stock-based compensation awards, unearned compensation, weighted average expected recognition period (in years) Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Stock-based compensation, vested awards, intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Condensed Financial Statements [Table] Condensed Financial Statements [Table] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Earnings Per Share [Abstract] Earnings Per Share, Basic and Diluted [Abstract] Net income attributable to MasTec: Net Income (Loss) Attributable to Parent, Diluted [Abstract] Net income - basic (in dollars) Net Income (Loss) Attributable to Parent Net income - diluted (in dollars) Net Income (Loss) Attributable to Parent, Diluted Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average shares outstanding - basic Weighted Average Number of Shares Outstanding, Basic Dilutive common stock equivalents (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Weighted average shares outstanding - diluted Weighted Average Number of Shares Outstanding, Diluted Schedule of Activity, Restricted Shares Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Schedule of Employee Stock Purchase Plans Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Lease Obligations Leases of Lessee Disclosure [Text Block] Provision for Income Taxes [Table] Provision For Income Taxes [Table] A summary of the components of an entity's provision for income taxes, including the current and deferred portions. Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Continuing Operations [Member] Continuing Operations [Member] Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) State and local Current State and Local Tax Expense (Benefit) Total current income tax expense Current Income Tax Expense (Benefit) Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) Foreign Deferred Foreign Income Tax Expense (Benefit) State and local Deferred State and Local Income Tax Expense (Benefit) Total deferred income tax expense Deferred Income Tax Expense (Benefit) Provision for income taxes Income Tax Expense (Benefit) Property, Plant and Equipment [Abstract] Schedule of Property and Equipment [Table] Property, Plant and Equipment [Table] Property and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land [Member] Land [Member] Building and Leasehold Improvements [Member] Building and Building Improvements [Member] Machinery and Equipment [Member] Machinery and Equipment [Member] Office Furniture and Equipment [Member] Furniture and Fixtures [Member] Construction in Progress [Member] Construction in Progress [Member] Property and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property and equipment Property, Plant and Equipment, Gross Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Estimated useful lives (in years) Property, Plant and Equipment, Useful Life Debt Long-term Debt [Text Block] Contingent Consideration by Type [Axis] Contingent Consideration by Type [Axis] Contingent Consideration Type [Domain] Contingent Consideration Type [Domain] Earn-Out Liabilities [Member] Earn-out Arrangements [Member] Acquisition-related contingent consideration, or “earn-outs,” represent the estimated fair value of future amounts payable for acquisitions of businesses and other interests. Other Current Liabilities [Member] Other Current Liabilities [Member] Acquisition-related contingent consideration liabilities, estimated fair value Obligations, Fair Value Disclosure Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high Acquisition-related contingent consideration liabilities, additions from new business combinations Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Acquisition-related contingent consideration liabilities, net increase (decrease), fair value adjustments, expense (income) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Acquisition-related contingent consideration liabilities, net increase, measurement period adjustments Acquisition-related contingent consideration liabilities, payments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Business, Basis of Presentation and Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Finance leases, assets, gross Finance Lease, Right-of-Use Asset, before Accumulated Amortization Amount, before accumulated amortization, of right-of-use asset from finance lease. Finance leases, assets, net of accumulated depreciation Finance Lease, Right-of-Use Asset Finance leases, assets, depreciation Finance Lease, Right-of-Use Asset, Amortization Selected Quarterly Financial Information [Abstract] Selected Quarterly Financial Information [Abstract] Revenue Revenues Costs of revenue, excluding depreciation and amortization Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income attributable to MasTec, Inc. Earnings per share: Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Guarantees and Product Warranties [Abstract] Guarantees and Product Warranties [Abstract] Other Guarantees [Table] Long-Duration Contracts, Assumptions, by Product and Guarantee [Table] Other Guarantees [Line Items] Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] General warranty, period (in years) Warranty Period, Expected Term Period the Company generally warrants the work it performs following substantial completion of a project, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months and thirteen days. Acquisition of Non-Controlling Interest [Member] Acquisition Of Noncontrolling Interest [Member] Acquisition of the remaining noncontrolling interest in a subsidiary. Number of subsidiaries, non-controlling interests Number Of Subsidiaries Number of consolidated subsidiaries reported by the Company. Payments to acquire remaining non-controlling interests Payments to Acquire Additional Interest in Subsidiaries Schedule of Multiemployer Plans [Table] Multiemployer Plan Period [Axis] Multiemployer Plan Period [Axis] Multiemployer Plan Period [Axis] Multiemployer Plan Period [Domain] Multiemployer Plan Period [Domain] [Domain] for Multiemployer Plan Period [Axis] Initial Critical Year Multiemployer Plan Period One [Member] Multiemployer Plan Period One [Member] Succeeding Plan Years Multiemployer Plan Period Two [Member] Multiemployer Plan Period Two [Member] Multiemployer Plan Name [Axis] Multiemployer Plan Name [Axis] Multiemployer Plan Name [Domain] Multiemployer Plan Name [Domain] Collective Bargaining Arrangement [Axis] Collective Bargaining Arrangement [Axis] Collective Bargaining Arrangement [Domain] Collective Bargaining Arrangement [Domain] Multiemployer Plan, Plan Information [Axis] Multiemployer Plan, Plan Information [Axis] Multiemployer Plan, Plan Information [Domain] Multiemployer Plan, Plan Information [Domain] Multiemployer Plans [Line Items] Multiemployer Plan, Collective-Bargaining Arrangement, Percentage of Contributions Required for Multiple Collective-Bargaining Arrangements Multiemployer Plan, Collective-Bargaining Arrangement, Percentage of Contributions Required for Multiple Collective-Bargaining Arrangements Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Foreign Plan [Member] Foreign Plan [Member] CANADA CANADA Central Pension Fund Of IUOE And Participating Employers [Member] Central Pension Fund Of IUOE And Participating Employers [Member] Central Pension Fund of the International Union of Operating Engineers and Participating Employers Pipeline Industry Pension Fund [Member] Pipeline Industry Pension Fund [Member] Pipeline Industry Pension Fund International Union of Operating Engineers Local 132 Pension Fund [Member] International Union Of Operating Engineers Local One Hundred And Thirty Two Pension Fund [Member] International Union of Operating Engineers Local 132 Pension Fund West Virginia Laborers' Pension Trust Fund [Member] West Virginia Laborers Pension Trust Fund [Member] West Virginia Laborers Pension Trust Fund Teamsters National Pipe Line Pension Plan [Member] Teamsters National Pipe Line Pension Plan [Member] Teamsters National Pipe Line Pension Plan IBEW Local 1249 Pension Plan [Member] I.B.E.W. Local 1249 Pension Plan [Member] I.B.E.W. Local 1249 Pension Plan Laborers' National Pension Fund [Member] Laborers National Pension Fund [Member] Laborers National Pension Fund Laborers' District Council of Western Pennsylvania Pension Fund [Member] Laborers' District Council of W PA Pension Fund [Member] Laborers' District Council of Western Pennsylvania Pension Fund. Midwest Operating Engineers Pension Trust Fund [Member] MidwestOperatingEngineersPensionTrustFund [Member] Midwest Operating Engineers Pension Trust Fund. Employer- Teamsters Local Nos. 175 & 505 Pension Trust Fund [Member] Employer- Teamsters Local One Hundred And Seventy Five And Five Hundred And Five Pension Trust Fund [Member] Employer- Teamsters Local 175 & 505 Pension Trust Fund Laborers' Local Union No. 158 Pension Fund [Member] Laborers' Local Union No. One Hundred And Fifty Eight Pension Fund [Member] Laborers' Local Union No. 158 Pension Fund Laborers' Pension Fund of Roanoke, Virginia [Member] Laborers' Pension Fund Of Roanoke, Virginia [Member] Laborers' Pension Fund of Roanoke, Virginia Laborers District Council & Contractors Pension Fund of Ohio [Member] Laborers District Council & Contractors Pension Fund of Ohio [Member] Laborers District Council & Contractors Pension Fund of Ohio. Central Laborers Pension Fund [Member] Central Laborers Pension Fund [Member] Central Laborers Pension Fund. National Electrical Benefit Fund [Member] National Electrical Benefit Fund [Member] National Electrical Benefit Fund Michigan Laborers Pension Fund [Member] Michigan Laborers Pension Fund [Member] Michigan Laborers' Pension Plan Ohio Operating Engineers Pension Plan [Member] Ohio Operating Engineers Pension Plan [Member] Ohio Operating Engineers Pension Plan Operating Engineers Local 324 Pension Fund [Member] Operating Engineers Local Three Hundred And Twenty Four Pension Fund [Member] Operating Engineers' Local 324 Pension Fund Other Funds [Member] Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member] Multiemployer plans, employer identification number Multiemployer plans, plan number Multiemployer Plan Number Multiemployer plans, collective bargaining arrangement, expiration date Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date Multiemployer plans, pension protection act zone status Multiemployer Plans, Certified Zone Status [Fixed List] Multiemployer plans, pension protection act zone status, date Multiemployer Plans, Certified Zone Status, Date Multiemployer plans, Company contributions greater than 5% of total plan contributions Multiemployer Plans, Period Contributions, Significance of Contributions [true false] Multiemployer plans, pension protection act zone status, extended amortization provisions Multiemployer Plans, Certified Zone Status, Extended Amortization Provisions [true false] Multiemployer plans, funding improvement plan and rehabilitation plan status Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan [Fixed List] Multiemployer plans, surcharge Multiemployer Plans, Surcharge [Fixed List] 2018 Acquisitions [Member] 2018 Acquisitions [Member] Acquisitions completed during the year 2018. 2017 Acquisitions [Member] 2017 Acquisitions [Member] Acquisitions completed during the year 2017. Cash, net of cash acquired Commitments and Contingencies Commitments Contingencies and Guarantees [Text Block] Legal Entity of Counterparty, Type [Axis] Legal Entity of Counterparty, Type [Axis] Legal Entity Type of Counterparty [Domain] Legal Entity Type of Counterparty [Domain] Government [Member] Government [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] United States [Member] UNITED STATES Foreign Operations [Member] Non-US [Member] Accounts Receivable, Net, Less Deferred Revenue [Member] Accounts Receivable [Member] Geographic Concentration Risk [Member] Geographic Concentration Risk [Member] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Intangible assets and goodwill, net Schedule of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Goodwill and intangible asset impairment Goodwill and Intangible Asset Impairment Non-cash interest expense, net Amortization of Debt Issuance Costs and Discounts Non-cash stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Provision for deferred income taxes Equity in earnings of unconsolidated affiliates Gains on sales of assets, net Gain (Loss) on Sale of Assets and Asset Impairment Charges Other non-cash items, net Other Noncash Income (Expense) Changes in assets and liabilities, net of acquisitions: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable, net of allowance and contract assets Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Other assets, current and long-term portion Increase (Decrease) in Other Operating Assets Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Contract liabilities Increase (Decrease) in Billing in Excess of Cost of Earnings Other liabilities, current and long-term portion Increase (Decrease) in Other Operating Liabilities Net cash provided by operating activities Cash flows from investing activities: Cash flows from financing activities: Repayments of credit facilities Payments of acquisition-related contingent consideration Proceeds from (distributions to) non-controlling interests Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Income tax payments (refunds), net Income Taxes Paid, Net Supplemental disclosure of non-cash information: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Additions to property and equipment from finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Components of Deferred Tax Assets and Liabilities [Abstract] Deferred tax assets: Deferred Tax Assets, Gross [Abstract] Accrued insurance Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Self Insurance Operating loss carryforwards and tax credits Compensation and benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Bad debt Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Other Deferred Tax Assets, Other Valuation allowance Deferred Tax Assets, Valuation Allowance Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Property and equipment Deferred Tax Liabilities, Property, Plant and Equipment Goodwill Deferred Tax Liabilities, Goodwill Other intangible assets Deferred Tax Liabilities, Intangible Assets Gain on remeasurement of equity investee Deferred Tax Liabilities, Tax Deferred Income Revenue recognition Deferred Tax Liabilities, Revenue Recognition Amount of deferred tax liability attributable to taxable temporary differences from revenue recognition. Investments in unconsolidated entities Deferred Tax Liabilities, Investment in Noncontrolled Affiliates Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax liabilities Income Statement [Abstract] General and administrative expenses General and Administrative Expense Interest expense, net Other expense (income), net Nonoperating Income (Expense) Provision for income taxes Net income Net income (loss) attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to MasTec, Inc. Earnings per share (Note 2): Basic earnings per share (in dollars per share) Basic weighted average common shares outstanding Diluted earnings per share (in dollars per share) Diluted weighted average common shares outstanding Statement [Table] Statement [Table] Restricted Stock Awards [Member] Restricted Stock [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Statement [Line Items] Statement [Line Items] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Unvested stock awards (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Treasury stock, shares Treasury Stock, Common, Shares EBITDA: Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] EBITDA EBITDA Earnings before interest, taxes, depreciation and amortization ("EBITDA"), a non-U.S. GAAP financial measure. Project gains (in dollars) Project losses (in dollars) Loss on Contracts Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Revenue [Member] AT&T (including DIRECTV) [Member] AT&T1 [Member] AT&T (including DIRECTV) (business name). Equitrans Midstream Corporation/EQT Corporation [Member] Equitrans Midstream Corporation/EQT Corporation [Member] Equitrans Midstream Corporation/EQT Corporation (business name). Energy Transfer Affiliates [Member] Energy Transfer Affiliates [Member] Energy Transfer affiliates (business name). Revenue, Significant Customer [Line Items] Revenue, Major Customer [Line Items] Schedule of Earnings Per Share Information Schedule of Weighted Average Number of Shares [Table Text Block] Rollforward of Goodwill by Reportable Segment Schedule of Goodwill [Table Text Block] Rollforward of Other Intangible Assets Intangible Assets Disclosure [Text Block] Schedule of Expected Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Consideration Paid and Net Assets Acquired, Business Combinations Schedule of Business Acquisitions, by Acquisition [Table Text Block] Schedule of Summarized Financial Information of Equity Method Investments Equity Method Investments [Table Text Block] Schedule of Financial Information by Reportable Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Reconciliation of Consolidated Income before Income Taxes to EBITDA Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Schedule of Significant Customers, Revenue Concentration Information Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] Schedule II - Valuation and Qualifying Accounts SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] EBITDA Reconciliation: Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract] Statement of Stockholders' Equity [Abstract] Treasury Stock [Member] Treasury Stock, Common [Member] Capital Surplus [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Retained Earnings [Member] Accumulated Other Comprehensive Loss [Member] AOCI Attributable to Parent [Member] Total MasTec, Inc. Shareholders’ Equity [Member] Parent [Member] Non-Controlling Interests [Member] Noncontrolling Interest [Member] Consolidated Statements of Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance, common shares outstanding (in shares) Beginning balance Beginning balance, treasury shares (in shares) Cumulative effect of adoption, revenue recognition (Topic 606) Cumulative Effect of New Accounting Principle in Period of Adoption Net income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Non-cash stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Issuance of restricted shares, net (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Issuance of restricted shares, net Stock Issued During Period, Value, Restricted Stock Award, Gross Issuance of restricted shares, net (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance of restricted shares, net Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Shares withheld for taxes, net of other share activity (in shares) Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Shares withheld for taxes, net of other share activity Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Other stock issuances, net of shares withheld for taxes (in shares) Stock Issued During Period, Shares, Other Other stock issuances, net of shares withheld for taxes Stock Issued During Period, Value, Other Acquisition of treasury stock, at cost (in shares) Treasury Stock, Shares, Acquired Acquisition of treasury stock, at cost Treasury Stock, Value, Acquired, Cost Method Distributions to non-controlling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Contributions from non-controlling interests Noncontrolling Interest, Increase from Subsidiary Equity Issuance Purchase of non-controlling interests Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Ending balance, common shares outstanding (in shares) Ending balance Ending balance, treasury shares (in shares) Accumulated Other Comprehensive Loss [Table] Accumulated Other Comprehensive Income (Loss) [Table] Foreign Currency [Member] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Other [Member] Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Accumulated Other Comprehensive Loss [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated other comprehensive loss, beginning balance Unrealized (losses) gains, net of tax Accumulated other comprehensive loss, ending balance 4.875% Senior Notes, gross carrying amount Senior Notes 4.875% Senior Notes, estimated fair value Notes Payable, Fair Value Disclosure Amortization Expense Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] Intangible assets, expected future amortization expense, 2020 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Intangible assets, expected future amortization expense, 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Two Intangible assets, expected future amortization expense, 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Three Intangible assets, expected future amortization expense, 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Four Intangible assets, expected future amortization expense, 2024 Finite-Lived Intangible Assets, Amortization Expense, Year Five Intangible assets, expected future amortization expense, thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Intangible assets, expected future amortization expense, total Stock-Based Compensation and Other Employee Benefit Plans Share-based Payment Arrangement [Text Block] Treasury stock acquired (in shares) Effect of share repurchases, decrease in weighted average shares outstanding (in shares) Effect Of Repurchases On Weighted Average Shares Outstanding The decrease in the Company's weighted average number of shares outstanding, as compared with the respective prior year period(s), as a result of current period(s) share repurchases. New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Operating leases, liabilities Award Type [Domain] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock-based compensation, vesting period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Stock-based compensation, shares withheld (in shares) Shares Paid For Exercise Price And Tax Withholding For Share Based Compensation For net-share settlement of share-based awards, when shares are withheld for exercise price of options and/or the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to pay the employer. Stock-based compensation, payments for employee tax obligations to taxing authorities (in dollars) Stock-based compensation, purchase price of common stock, percentage Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent Assets: Segment Reporting Information, Additional Information [Abstract] Assets Principles of Consolidation Consolidation, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Translation of Foreign Currencies Foreign Currency Transactions and Translations Policy [Policy Text Block] Management Estimates Use of Estimates, Policy [Policy Text Block] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Allowance for Doubtful Accounts Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Equity Method Investments Equity Method Investments [Policy Text Block] Unicorporated Entities, Proportional Consolidation Interest in Unincorporated Joint Ventures or Partnerships, Policy [Policy Text Block] Other Equity Investments With Readily Determinable Fair Values Marketable Securities, Policy [Policy Text Block] Other Equity Investments Without Readily Determinable Fair Values Equity Securities without Readily Determinable Fair Value [Policy Text Block] Deferred Financing Costs Deferred Charges, Policy [Policy Text Block] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Finite-Lived Intangible Assets Intangible Assets, Finite-Lived, Policy [Policy Text Block] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Goodwill and Indefinite-Lived Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Business Combinations Business Combinations Policy [Policy Text Block] Leases Lessor, Leases [Policy Text Block] Self-Insurance Self Insurance Reserve [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Income Tax Uncertainties Income Tax Uncertainties, Policy [Policy Text Block] Stock-Based Compensation Share-based Payment Arrangement [Policy Text Block] Collective Bargaining Agreements and Multiemployer Plans Collective Bargaining Agreements and Multiemployer Plans [Policy Text Block] Disclosure of accounting policy for collective bargaining agreements and multiemployer plans. Restructuring Activities Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block] Litigation and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Comprehensive Income (Loss) Comprehensive Income, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Sublimit in Foreign Denominations [Member] Foreign Denomination [Member] Contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars, in Canadian dollars and/or Mexican pesos. Letters of Credit [Member] Letter of Credit in Alternative Currencies [Member] Letter of Credit in Foreign Denomination [Member] The portion of the maximum amount of borrowing capacity under a line of credit that is available in Canadian dollars and/or Mexican pesos as of the balance sheet date for letters of credit. Swing Line Loans [Member] Bridge Loan [Member] Forecast [Member] Forecast [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Eurocurrency Rate [Member] Eurocurrency Rate [Member] Interest rate at which a bank borrows funds from other banks in a foreign market. Base Rate [Member] Base Rate [Member] Federal Funds Rate [Member] Federal Funds Purchased [Member] Commercial and/or Financial Standby [Member] Performance Standby [Member] Permitted Acquisition [Member] Permitted Acquisition [Member] A permitted acquisition or series of permitted acquisitions as defined in the Credit Facility agreement. Line of credit facility, maximum borrowing capacity Line of credit facility, term loan, amount of quarterly principal installment payments Line of Credit Facility, Periodic Payment, Principal Line of credit facility, interest rate description Debt Instrument, Basis Spread on Variable Rate Line of credit facility, unused facility fee (percentage) Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Long-term Line of Credit Long-term Line of Credit Line of credit facility, letters of credit issued Line of credit facility, remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Line of credit facility, capacity available for letters of credit Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases Percentage of consolidated EBITDA threshold, combined subsidiary guarantors Percentage Of Consolidated EBITDA Threshold, Combined Subsidiary Guarantors 1 Ratio of Loan Party EBITDA as of the most recent four quarters to Adjusted Consolidated EBITDA as of the most recent four quarters. Maximum consolidated leverage ratio Ratio of Indebtedness to Net Capital Consolidated interest coverage ratio Consolidated Interest Coverage Ratio The ratio which is calculated by dividing earnings before interest and taxes for a period by interest expense for the same period. Permitted acquisitions amount Permitted Acquisitions Amount Minimum threshold amount of consideration for permitted acquisition or series of permitted acquisitions during a fiscal quarter in order to permit a higher consolidated leverage ratio range for such a fiscal quarter and the subsequent two fiscal quarters. Number of fiscal quarters subsequent to quarter in which right was exercised Number Of Fiscal Quarters Subsequent To Quarter In Which Right Was Exercised Number of subsequent fiscal quarters that the Consolidated Leverage Ratio may be temporarily increased to up to a certain multiple, after the initial fiscal quarter in which such ratio was increased. Number of times right may be exercised Number Of Times Right May Be Exercised Number of times during the term of the Credit Facility that the right to permit the consolidated leverage ratio to exceed a specified threshold may be or has been exercised. Schedule of Carrying Values of Debt Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Contractual Maturities of Debt and Finance Lease Obligations Schedule of Maturities of Long-term Debt [Table Text Block] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] September 2018 Share Repurchase Program [Member] September 2018 Share Repurchase Program [Member] Share repurchase program authorized by the board of directors in September 2018. 2016 Share Repurchase Program [Member] 2016 Share Repurchase Program [Member] Share repurchase plan authorized by the board of directors in 2016. March 2018 Share Repurchase Program [Member] March 2018 Share Repurchase Program [Member] Share repurchase program authorized by the board of directors in March 2018. December 2018 Share Repurchase Program [Member] December 2018 Share Repurchase Program [Member] Share repurchase program authorized by the board of directors in December 2018. Equity, Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Treasury stock acquired, value Share repurchase program, authorized amount, value Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Schedule of Accounts Receivable, Net of Allowance, and Contract Assets Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Supplemental Guarantor Financial Information Condensed Financial Statements [Text Block] Other Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Equity Stockholders' Equity Note Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation (losses) gains, net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Unrealized (losses) gains on equity investee activity, net of tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to MasTec, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Finance lease, weighted average remaining lease term (in years) Finance Lease, Weighted Average Remaining Lease Term Finance lease, weighted average discount rate, percent Finance Lease, Weighted Average Discount Rate, Percent Operating lease, weighted average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Operating lease, weighted average discount rate, percent Operating Lease, Weighted Average Discount Rate, Percent Leases not yet commenced, future lease obligation Lessee, Lease Not Yet Commenced, Obligation Obligation of lessee's lease that has not yet commenced. Leases not yet commenced, lease terms Lessee, Lease Not Yet Commenced, Term Of Contract Term of lessee's lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Uncertain Tax Positions [Rollforward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Beginning balance Unrecognized Tax Benefits Additions based on tax positions related to the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Additions for tax positions of prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Reductions for tax positions of prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Ending balance Property and Equipment [Member] Property, Plant and Equipment [Member] Capitalized internal-use software, gross Capitalized Computer Software, Gross Capitalized internal-use software, net Capitalized Computer Software, Net Accrued capital expenditures Capital Expenditures Incurred but Not yet Paid Eliminations [Member] Intersegment Eliminations [Member] Utilities [Member] Utilities [Member] Customers of the business entity whose end-market products or services are in the utilities industry. Revenue: Segment Reporting Information, Revenue for Reportable Segment [Abstract] Revenue (in dollars) Utilities customers, percentage of Communications segment revenue Cash proceeds (in dollars) Common shares issued (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Weighted average price per share purchased under employee stock purchase plans Weighted Average Price Per Share Purchased Under Employee Stock Purchase Plans Share-based payment arrangement, weighted-average price per share purchased under employee stock purchase plans. Weighted average per share grant date fair value (in dollars per share) Employee Stock Purchase Plan, Weighted Average Per Share Grant Date Fair Value The weighted average per share grant date fair value of shares issued under the employee stock purchase plans during the reporting period. Chief Executive Officer [Member] Chief Executive Officer [Member] Life insurance, face amount Life Insurance, Corporate or Bank Owned, Amount Payments for life insurance policies Payment to Acquire Life Insurance Policy, Investing Activities Life insurance assets, carrying amount Cash Surrender Value of Life Insurance Earnings Per Share Earnings Per Share [Text Block] Acquisition consideration: Business Combination, Consideration Transferred [Abstract] Cash, net of cash acquired and other Estimated fair value of contingent consideration and other liabilities Business Combination, Consideration Transferred, Liabilities Incurred Total consideration transferred Business Combination, Consideration Transferred Identifiable assets acquired and liabilities assumed: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Current assets, primarily composed of accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Property and equipment, including finance leases and other long-term assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Amortizing intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Current liabilities, including current portion of finance lease obligations and long-term debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Long-term debt, including finance lease obligations Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Deferred income taxes and other long-term liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Total identifiable net assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Goodwill Total net assets acquired, including goodwill Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Risks and Uncertainties [Abstract] Concentration Risk [Table] Concentration Risk [Table] Credit Concentration Risk [Member] Credit Concentration Risk [Member] Customers with Largest Net Accounts Receivable Positions [Member] Disclosed Customers With Highest Net Accounts Receivable Positions [Member] Disclosed customers who accounted for the highest/largest net accounts receivable positions, which represents accounts receivable, net, less billing in excess of costs and earnings. Customer with Largest Net Accounts Receivable Position [Member] Customer With Highest Net Accounts Receivable Position1 [Member] Customer who accounted for the highest/largest net accounts receivable position, which represents accounts receivable, net, less billings in excess of costs and earnings. Customer with Second Largest Net Accounts Receivable Position [Member] Customer With Second Highest Net Accounts Receivable Position [Member] Customer who accounted for the second highest/largest net accounts receivable position, which represents accounts receivable, net, less billings in excess of costs and earnings. Customer With Third Largest Net Accounts Receivable Position [Member] Customer With Third Highest Net Accounts Receivable Position [Member] Customer who accounted for the third highest/largest net accounts receivable position, which represents accounts receivable, net, less billings in excess of costs and earnings. Ten Largest Customers [Member] Ten Largest Customers1 [Member] Ten largest customers. Concentration Risk [Line Items] Concentration Risk [Line Items] Number of customers Number Of Customers1 Number of customers. Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Number of operating segments Number of Operating Segments Number of reportable segments Number of Reportable Segments Schedule of Quarterly Information (Unaudited) Quarterly Financial Information [Table Text Block] Capital Expenditures: Capital expenditures Condensed Income Statement [Table] Condensed Income Statement [Table] Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items] Condensed Income Statements, Captions [Line Items] Interest expense (income), net Other (income) expense, net (Provision for) benefit from income taxes Net income (loss) before equity in income (loss) from subsidiaries Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Equity in income (losses) from subsidiaries, net of tax Income (Loss) from Subsidiaries, Net of Tax Net income (loss) attributable to non-controlling interests Comprehensive income (loss) Contract billings Contract Receivable, Due in Next Twelve Months Less allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Accounts receivable, net of allowance Accounts Receivable, Net of Allowance, and Contract Assets [Abstract] Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] Retainage Contract Receivable Retainage, Next Twelve Months Unbilled receivables Unbilled Contracts Receivable Contract assets Schedule II - Valuation and Qualifying Accounts [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Schedule II - Valuation and Qualifying Accounts Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] Schedule II - Valuation and Qualifying Accounts [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Allowance for Doubtful Accounts [Member] SEC Schedule, 12-09, Allowance, Credit Loss [Member] Costs and Earnings in Excess of Billings Allowance [Member] Allowance for CEIB [Member] A valuation allowance established for amounts relating to costs and earnings in excess of billings that are expected to be uncollectible. Valuation Allowance for Inventory [Member] SEC Schedule, 12-09, Reserve, Inventory [Member] Valuation Allowance for Deferred Tax Assets [Member] SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] Schedule II - Valuation and Qualifying Accounts [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] Schedule II - Valuation and Qualifying Accounts [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Balance at beginning of period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Charges to cost and expense SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Other additions SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account (Deductions) SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Balance at end of period Pacer [Member] Pacer [Member] Pacer Construction Holdings Corporation and its affiliated operating companies ("Pacer") (business name). Investment [Member] Investments [Member] Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Schedule of Multiemployer Pension Plans Schedule of Multiemployer Plans [Table Text Block] Schedule of Covered Employees and Contributions, Multiemployer Plans Schedule of Costs of Retirement Plans [Table Text Block] Other Commitments [Table] Other Commitments [Table] Proportionately Consolidated Non-Controlled Joint Venture [Member] Ownership [Axis] Ownership [Axis] Ownership [Domain] Ownership [Domain] Joint Ventures That Provide Electrical Transmission Infrastructure Services [Member] Joint Ventures That Provide Electrical Transmission Infrastructure Services [Member] Joint venture(s) that provide(s) electrical transmission infrastructure services. Canadian Joint Venture [Member] Canadian Joint Venture [Member] Proportionately consolidated non-controlled Canadian joint venture [Member] Other Commitments [Line Items] Other Commitments [Line Items] Debt instruments, accrued interest payable Interest Payable, Current Restricted Stock Units [Member] Restricted Stock Units (RSUs) [Member] Restricted Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Non-vested restricted shares, beginning balance (in shares) Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Canceled/forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Non-vested restricted shares, ending balance (in shares) Per Share Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Non-vested restricted shares, per share weighted average grant date fair value, beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Canceled/forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Non-vested restricted shares, per share weighted average grant date fair value, ending balance (in dollars per share) Summarized Financial Information of Equity Method Investments [Line Items] Equity Method Investment, Summarized Financial Information [Abstract] Current assets Equity Method Investment, Summarized Financial Information, Current Assets Long-term assets Equity Method Investment, Summarized Financial Information, Noncurrent Assets Total assets Equity Method Investment, Summarized Financial Information, Assets Current liabilities Equity Method Investment, Summarized Financial Information, Current Liabilities Long-term liabilities Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities Total liabilities Equity Method Investment, Summarized Financial Information, Liabilities Revenue Equity Method Investment, Summarized Financial Information, Revenue Net income Equity Method Investment, Summarized Financial Information, Net Income (Loss) Business, Basis of Presentation and Significant Accounting Policies [Table] Business, Basis Of Presentation And Significant Accounting Policies [Table] Schedule reflecting financial concepts. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Lease Arrangements [Axis] Lease Arrangements [Axis] Information by group of related lease arrangements. For example, but not limited to, leases grouped by asset class and/or contractual terms. Lease Arrangements [Domain] Lease Arrangements [Domain] Group of related lease arrangements. For example, but not limited to, leases grouped by asset class and/or contractual terms. Facility Leases [Member] Facility Leases [Member] Amount pertaining to leasing of facilities. Equipment Leases [Member] Equipment Leases [Member] Amount pertaining to leasing of equipment. Workers' Compensation Policy [Member] General Liability Policy [Member] General Liability [Member] Property Insurance Policy [Member] Property Insurance [Member] Automobile Liability [Member] Automobiles [Member] Business, Basis Of Presentation And Significant Accounting Policies [Line Items] Business, Basis Of Presentation And Significant Accounting Policies [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Valuation allowances for inventory Inventory Valuation Reserves Cash Financing costs incurred Payments of Debt Issuance Costs Amortization of deferred financing costs Amortization of Debt Issuance Costs Deferred financing costs, net of accumulated amortization Lessee, Lease, Term Of Contract Lessee, Lease, Term Of Contract Term of lessee's lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Lessee, Lease, Renewal Term Lessee, Lease, Renewal Term Term of lessee's lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Per claim deductible, insurance policies Malpractice Insurance, Deductible Loss contingency, maximum loss per employee Loss Contingency, Range Of Possible Loss, Maximum, Per Employee The maximum amount of possible loss from the contingency per employee. Debt instrument, principal amount (in dollars) Debt Instrument, Face Amount