Goodwill and Intangible Assets Disclosure [Abstract] Business Combinations [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 on 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. Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] 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] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Business Combinations [Line Items] Business Acquisition [Line Items] Business combinations, number of acquisitions Number of Businesses Acquired Business combinations, cash paid (in dollars) Payments to Acquire Businesses, Gross Business combinations, contingent consideration, earn-out liabilities Business Combination, Contingent Consideration, Liability 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, high (in dollars) Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Receivables [Abstract] Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Fair Value Disclosures [Abstract] Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] Fair Value Measurements, Recurring and Non-Recurring [Table] Fair Value Measurements, 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) and together, referred to as the Waha JVs. Investment [Axis] Investment Issuer [Axis] Investment [Domain] Investment Issuer [Domain] CCI [Member] Cross Country Infrastructure [Member] Cross Country Infrastructure Services Inc. ("CCI") (business name). “CCI” was previously Cross Country Pipeline Supply, Inc. (“CCP”). 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] 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 Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Equity investments, impairments Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Statement of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net (Note 5) Accounts Receivable, 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 Operating lease assets Operating Lease, Right-of-Use Asset Goodwill, net Goodwill 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 Long-term Debt and Capital Lease Obligations, Current 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 Billings in excess of costs and earnings Billings in Excess of Cost, Current Other current liabilities Other Liabilities, Current Total current liabilities Liabilities, Current Long-term debt, including finance leases Long-term Debt and Capital Lease Obligations 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 - 91,626,986 and 91,327,009 (including 1,152,993 and 1,251,533 of unvested stock awards) as of June 30, 2019 and December 31, 2018, respectively Common Stock, Value, Issued Capital surplus Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Treasury stock, at cost: 15,344,917 and 15,329,817 shares as of June 30, 2019 and December 31, 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 Accounting Policies [Abstract] Business, Basis of Presentation and Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Earnings Per Share [Abstract] Schedule of Earnings Per Share Information Schedule of Weighted Average Number of Shares [Table Text Block] Schedule of Accounts Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Accounts Receivable Financing Arrangements [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. Provisions for doubtful accounts Provision for Doubtful Accounts Revenue recognition, BIEC, revenue recognized Contract with Customer, Liability, Revenue Recognized Contract liabilities Contract with Customer, Liability, Current Interest expense, net Interest Revenue (Expense), Net Schedule of Accounts Receivable, Net of Allowance, and Contract Assets Contract with Customer, Asset and Liability [Table Text Block] Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Immediate Family Member of Management [Member] Immediate Family Member of Management or Principal Owner [Member] 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. Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Equipment [Member] Equipment [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Business combinations, notes payable assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities Business combinations, interest accrued on notes payable assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Interest Payable The amount of accrued interest payable assumed which has been recognized as of the acquisition date. Repayments of notes payable and interest accrued Repayments of Notes Payable Advances outstanding, related party Due from Affiliates 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. Payments, net of rebates, related party Related Party Transaction, Amounts of Transaction Payables, related party Accounts Payable, Related Parties Rebates receivable, related party Rebates Receivables, Related Parties Rebates receivables from related parties. Equity [Abstract] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Treasury Stock, Common [Member] Treasury Stock, Common [Member] 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 (in shares) Treasury Stock, Shares, Acquired Treasury stock acquired, value Treasury Stock, Value, Acquired, Cost Method Share repurchase program, amount authorized, value Stock Repurchase Program, Authorized Amount Share repurchase program, amount available for future share repurchases, value Stock Repurchase Program, Remaining Authorized Repurchase Amount Equity Stockholders' Equity Note Disclosure [Text Block] Leases [Abstract] Lease Obligations Leases of Lessee Disclosure [Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Condensed Unaudited Financial Statements, Supplemental Guarantor Information [Abstract] -- None. No documentation exists for this element. -- Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss) Condensed Income Statement [Table Text Block] Condensed Unaudited Consolidating Balance Sheets Condensed Balance Sheet [Table Text Block] Condensed Unaudited Consolidating Statements of Cash Flows Condensed Cash Flow Statement [Table Text Block] 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 Unaudited 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 Proceeds from (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 Proceeds from (distributions to) non-controlling interests Proceeds from (Payments to) Noncontrolling Interests Repurchases of common stock Payments for Repurchase of Common Stock Proceeds from stock-based awards, net Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options 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 - end of period Goodwill, Net [Abstract] Goodwill, Impaired, Accumulated Impairment Loss [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. Power Generation and Industrial [Member] Power Generation and Industrial [Member] Installation and construction of conventional and renewable power facilities, 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. Goodwill [Line Items] Goodwill [Line Items] Goodwill, gross Goodwill, Gross Accumulated impairment losses Goodwill, Impaired, Accumulated Impairment Loss Goodwill, net Property, Plant and Equipment [Abstract] Schedule of Property and Equipment, Net [Table] Property, Plant and Equipment [Table] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Property and Equipment [Member] Property, Plant and Equipment [Member] Property and Equipment [Line Items] Property, Plant and Equipment [Line Items] Capitalized internal-use software, gross Capitalized Computer Software, Gross Capitalized internal-use software, net Capitalized Computer Software, Net Depreciation and amortization Depreciation, Depletion and Amortization Accrued capital expenditures Capital Expenditures Incurred but Not yet Paid Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Common Stock [Member] Common Stock [Member] Treasury Stock [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] Statement [Line Items] Statement [Line Items] Condensed Unaudited Consolidated Statements of Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance, common shares outstanding (in shares) Common Stock, Shares, Issued Beginning balance Beginning balance, treasury shares (in shares) Treasury Stock, Common, Shares Cumulative effect of adoption, Topic 606 Cumulative Effect of New Accounting Principle in Period of Adoption Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax Non-cash stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Issuance (forfeiture) of restricted shares, net (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance (forfeiture) of restricted shares, net Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures 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) Acquisition of treasury stock, at cost Contributions from non-controlling interests Noncontrolling Interest, Increase from Subsidiary Equity Issuance Ending balance, common shares outstanding (in shares) Ending balance Ending balance, treasury shares (in shares) Share-based Compensation [Abstract] Stock-Based Compensation and Other Employee Benefit Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments Contingencies and Guarantees [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Equity Method Investments Equity Method Investments [Policy Text Block] Unincorporated Entities, Proportionate Consolidation Interest in Unincorporated Joint Ventures or Partnerships, 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] Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Stock-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] 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] Cash proceeds (in dollars) Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options Common shares issued (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Weighted average price per share (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted average per share grant date fair value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Restricted Stock Awards [Member] Restricted Stock [Member] 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 Unvested stock awards (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Treasury stock, shares Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract] Number of reportable segments Number of Reportable Segments Revenue from Contract with Customer [Abstract] Revenue [Table] Disaggregation of Revenue [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Revenue [Member] Sales Revenue, Services, Net [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] 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] Scenario [Axis] Scenario [Axis] Scenario [Domain] Scenario, Unspecified [Domain] Plan [Member] Scenario, Plan [Member] Revenue [Line Items] Disaggregation of Revenue [Line Items] 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 Revenue recognition, performance obligations, completion period (in years) Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, 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. Leases, Operating [Abstract] Leases, Operating [Abstract] 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] Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Operating lease assets Operating lease liabilities Operating Lease, Liability Management [Member] Management [Member] Chairman, Board of Directors [Member] Board of Directors Chairman [Member] Executive Officers [Member] Executive Officer [Member] Subcontracting Arrangements [Member] Subcontracting Arrangements [Member] The performance of services under a subcontracting arrangement. Lease Agreements [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. Number of additional management employees, subcontracting arrangement Entity Number of Employees Payments or expenses, related party Related Party Transaction, Expenses from Transactions with Related Party Revenue, related party Revenue from Related Parties Charges, related party Related Party Transaction, Other Revenues from Transactions with Related Party Receivables, related party Accounts Receivable, Related Parties Finance leases, assets, gross Capital Leased Assets, Gross Finance leases, assets, net Finance Lease, Right-of-Use Asset Finance leases, assets, depreciation Finance Lease, Right-of-Use Asset, Amortization Debt Disclosure [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] Senior Notes [Member] Senior Notes [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] Debt instruments, accrued interest payable (in dollars) Interest Payable, Current Debt instrument, interest rate (percentage) Debt Instrument, Interest Rate, Stated Percentage Income Tax Disclosure [Abstract] Consolidated effective tax rate, percent Effective Income Tax Rate Reconciliation, Percent Stock-based compensation, vested awards, excess tax benefits (in dollars) 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. 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 (losses) 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 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 4.875% Senior Notes, gross carrying amount Senior Notes 4.875% Senior Notes, estimated fair value Notes Payable, Fair Value Disclosure Schedule of Carrying Values of Debt Schedule of Long-term Debt Instruments [Table Text Block] Condensed Income Statement [Table] Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items] Condensed Income Statements, Captions [Line Items] Revenue Revenues Costs of revenue, excluding depreciation and amortization Cost of Services, Excluding Depreciation, Depletion, and Amortization General and administrative expenses General and Administrative Expense Interest expense (income), net Equity in earnings of unconsolidated affiliates Other expense (income), net Nonoperating Income (Expense) Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (Provision for) benefit from income taxes Income Tax Expense (Benefit) Net income (loss) before equity in income 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 Net income (loss) attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to MasTec, Inc. Net Income (Loss) Attributable to Parent Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Weighted Average [Member] Weighted Average [Member] Foreign Line of Credit [Member] Foreign Line of Credit [Member] Line of Credit [Member] Line of Credit [Member] Currency [Axis] Currency [Axis] All Currencies [Domain] All Currencies [Domain] Canadian Dollars [Member] Canada, Dollars Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Letters of Credit [Member] Letter of Credit [Member] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Performance Standby [Member] Standby Letters of Credit [Member] Long-term debt obligations Long-term Debt, Gross Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Line of credit facility, letters of credit issued Letters of Credit Outstanding, Amount Line of credit facility, interest rate (percentage) Line of Credit Facility, Interest Rate at Period End Segment Reporting [Abstract] Segments and Related Information [Table] Schedule of Segment Reporting Information, by Segment [Table] Reportable Segments [Member] Operating Segments [Member] Eliminations [Member] Intersegment Eliminations [Member] Other [Member] Other Segments [Member] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Utilities [Member] Utilities [Member] Customers of the business entity whose end-market products or services are in the utilities industry. Segments and Related Information [Line Items] Segment Reporting Information [Line Items] Revenue: Segment Reporting Information, Revenue for Reportable Segment [Abstract] Revenue (in dollars) Utilities customers, percentage of Communications segment revenue Risks and Uncertainties [Abstract] Concentration Risk [Table] Concentration Risk [Table] Accounts Receivable, Net, Less BIEC [Member] Accounts Receivable [Member] 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 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 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 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 net accounts receivable position, which represents accounts receivable, net, less billings in excess of costs and earnings. Customer With Fourth Highest Net Accounts Receivable Position [Member] [Member] Customer With Fourth Highest Net Accounts Receivable Position [Member] Customer who accounted for the fourth highest 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. Earnings Per Share Earnings Per Share [Text Block] 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 and Restricted Stock Units are together referred to as "Restricted Shares". 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) Income Taxes Income Tax Disclosure [Text Block] Finance leases, weighted average remaining lease term (in years) Finance Lease, Weighted Average Remaining Lease Term Finance leases, weighted average discount rate, percent Finance Lease, Weighted Average Discount Rate, Percent Operating leases, weighted average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Operating leases, weighted average discount rate, percent Operating Lease, Weighted Average Discount Rate, Percent Guarantees and Product Warranties [Abstract] Other Guarantees [Table] Schedule of Guarantor Obligations [Table] Subsidiaries [Member] Subsidiaries [Member] Other Guarantees [Line Items] Guarantor Obligations [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. Schedule of Revenue by Major Customers, by Reportable Segment [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] AT&T (including DIRECTV) [Member] AT&T1 [Member] AT&T, including DIRECTV (business name). Energy Transfer Affiliates [Member] Energy Transfer Affiliates [Member] Energy Transfer affiliates (business name). EQT Corporation [Member] EQT Corporation [Member] EQT Corporation (business name). Revenue, Significant Customers [Line Items] Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Cover page. Document Type Document Type Document Quarterly Report Document Quarterly 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 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 Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Schedule of Activity, Restricted Shares Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of Employee Stock Purchase Plans Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Business Combinations [Abstract] 2018 Acquisitions [Member] 2018 Acquisitions [Member] Acquisitions completed during the year 2018. Business combinations, percentage of interests acquired Business Acquisition, Percentage of Voting Interests Acquired 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 Allocated Share-based Compensation Expense Stock-based compensation, income tax benefits Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Stock-based compensation, vested awards, net tax benefits 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 - 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 Lease Arrangement, Type [Axis] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Domain] Lease Arrangement, Type [Domain] Lease Term in Excess of One Year [Member] Lease Term In Excess Of One Year [Member] Lease term in excess of one year. Lease Term of One Year or Less [Member] Lease Term Less Than One Year [Member] Lease term of one year or less. 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 Schedule of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Condensed Financial Statements [Table] Condensed Financial Statements [Table] Condensed Unaudited Consolidating Financial Information [Line Items] Condensed Financial Statements, Captions [Line Items] Pensare [Member] Pensare [Member] Pensare Acquisition Corp ("Pensare") (business name) Investment [Axis] Investment [Axis] Investment [Domain] Investment [Domain] Equity investment and warrants, amount paid (in dollars) Payments to Acquire Long-term Investments 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) Investment Warrants, Exercise Price Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] United States [Member] UNITED STATES Foreign Operations [Member] Non-US [Member] Geographic Concentration Risk [Member] Geographic Concentration Risk [Member] Intangible assets and goodwill, net Intangible Assets, Net (Including Goodwill) Finance Leases Finance Lease Liabilities, Payments, Due [Abstract] 2019, remaining six months Finance Lease, Liability, Payments, Remainder of Fiscal Year 2020 Finance Lease, Liability, Payments, Due Year Two 2021 Finance Lease, Liability, Payments, Due Year Three 2022 Finance Lease, Liability, Payments, Due Year Four 2023 Finance Lease, Liability, Payments, Due Year Five Thereafter Finance Lease, Liability, Payments, Due after Year Five Total minimum lease payments Finance Lease, Liability, Payments, 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 Operating Lease Liabilities, Payments Due [Abstract] 2019, remaining six months Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 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 Less current portion Long-term portion of lease obligations, net of interest Number of operating segments Number of Operating Segments Multiemployer Plans [Abstract] Other Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Supplemental Guarantor Financial Information Condensed Financial Statements [Text Block] Commitments and Contingencies [Table] Loss Contingencies [Table] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Canadian Acquisition Arbitration [Member] Canadian Acquisition Arbitration [Member] Canadian acquisition arbitration. 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 Costs [Member] Interest Expense [Member] Performance and Payment Bonds [Member] Performance Guarantee [Member] Financial Guarantees [Member] Financial Standby Letter of Credit [Member] Surety Bonds [Member] Surety Bond [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 [Member] Group Insurance Policies [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] Collateral [Axis] Collateral [Domain] Cash [Member] Cash [Member] Commitments and Contingencies [Line Items] Loss Contingencies [Line Items] Favorable arbitration award Litigation Settlement, Amount Awarded from Other Party Collections of arbitration award Proceeds from Legal Settlements Letters of credit issued Outstanding bonds, amount Guarantor Obligations, Maximum Exposure, Undiscounted 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 Corporate [Member] Corporate, Non-Segment [Member] Depreciation and Amortization: Depreciation, Depletion and Amortization [Abstract] Segments and Related Information Segment Reporting Disclosure [Text Block] Intangible Assets, Net (Excluding Goodwill) [Abstract] Schedule of Other Intangible Assets [Table] ScheduleOfIntangibleAssets [Table] Schedule of intangible assets, excluding goodwill. Non-Amortizing Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Non-Amortizing Intangible Assets [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Trade Names [Member] Trade Names [Member] Pre-Qualifications [Member] Contractual Rights [Member] Amortizing Intangible Assets [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Amortizing Intangible Assets [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer Relationships and Backlog [Member] Customer-Related Intangible Assets [Member] Other Amortizing Intangible Assets [Member] Other Intangible Assets [Member] Other Intangible Assets [Line Items] Intangible Assets [Line Items] Line items for intangible assets, excluding goodwill. Other intangible assets, non-amortizing Indefinite-lived Intangible Assets (Excluding Goodwill) 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 [Rollforward] 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 Amortization expense Amortization of Intangible Assets 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 EBITDA Reconciliation: Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract] EBITDA EBITDA Earnings before interest, taxes, depreciation and amortization ("EBITDA"), a non-U.S. GAAP financial measure. Schedule of Covered Employees and Contributions, Multiemployer Plans [Table] Schedule of Multiemployer Plans [Table] Workforce Subject to Collective Bargaining Arrangements [Member] Workforce Subject to Collective Bargaining Arrangements [Member] Unionized Employees [Member] Unionized Employees Concentration Risk [Member] Low [Member] High [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] 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 Goodwill, Gross [Member] Goodwill, Gross [Member] Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Goodwill, Accumulated Impairment Loss [Member] Goodwill, Accumulated Impairment Loss [Member] Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Goodwill, additions from new business combinations Goodwill, Acquired During Period Goodwill, measurement period adjustments Goodwill, Purchase Accounting Adjustments Goodwill, currency translation gains (losses) Goodwill, Foreign Currency Translation Gain (Loss) Amortization expense, intangible assets EBITDA: Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Equipment, Supplies and Services [Member] Equipment, Supplies and Services [Member] Purchases, rents and leases equipment and purchases various types of supplies and services used in its business. Acquisition of Non-Controlling Interest [Member] Acquisition Of Noncontrolling Interest [Member] Acquisition of the remaining noncontrolling interest in a subsidiary. Payments, related party Receivables, net, related party Number of subsidiaries Number Of Subsidiaries Number of consolidated subsidiaries reported by the Company. Other Commitments [Table] Other Commitments [Table] Proportionately Consolidated Non-Controlled Joint Venture [Member] Corporate 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. Pacer [Member] Pacer [Member] Pacer Construction Holdings Corporation and its affiliated operating companies ("Pacer") (business name). Advances on Project Work [Member] Advances On Project Work [Member] Advances on project work. Other Commitments [Line Items] Other Commitments [Line Items] Proportionately consolidated non-controlled joint venture, ownership percentage Proportionately Consolidated Joint Venture Ownership Percentage The percentage interest in a proportionately consolidated joint venture. Cash Other current liabilities 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] 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 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 months) 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] 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 Property, Plant and Equipment, Gross Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Statement of Comprehensive Income [Abstract] Net income Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation gains (losses), 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) 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 Credit Facility [Member] Domestic Line of Credit [Member] Revolving Loans [Member] Revolving Credit Facility [Member] Term Loan [Member] Loans Payable [Member] Commercial and/or Financial Standby [Member] Line of credit facility, term loan, amount of quarterly principal installment payments Line of Credit Facility, Periodic Payment, Principal Line of credit facility, amount of borrowings denominated in foreign currencies Line Of Credit Facility, Amount Denominated In Foreign Currencies The carrying value as of the balance sheet date of the portion of the revolving credit facility obligation which is denominated in foreign currencies. 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 Line of credit facility, remaining borrowing capacity available in either Canadian dollars or Mexican pesos Line Of Credit Facility, Remaining Borrowing Capacity In Foreign Currency Amount of borrowing capacity currently available in either Canadian dollars or Mexican pesos that is included in the total amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Line of credit facility, unused facility fee (percentage) Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Chief Executive Officer [Member] Chief Executive Officer [Member] Payments for life insurance policies Payment to Acquire Life Insurance Policy, Investing Activities Life insurance assets, carrying amount Cash Surrender Value of Life Insurance Line of credit facility, maturity date Line of Credit Facility, Expiration Date 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 Capital Lease Obligations, Including Current Maturities, Gross Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt and capital 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 Capital Lease Obligations, Including Current Maturities Current portion of long-term debt Long-term debt Schedule of Covered Employees and Contributions, Multiemployer Plans Schedule of Costs of Retirement Plans [Table Text Block] Income Statement [Abstract] Equity in earnings of unconsolidated affiliates Other expense (income), net Provision for income taxes Earnings per share (Note 2): Basic earnings per share (in dollars per share) Earnings Per Share, Basic Basic weighted average common shares outstanding Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Diluted weighted average common shares outstanding Pro Forma Financial Information and Acquisition Results [Abstract] Business Acquisition, Pro Forma Information [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 income (loss) Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Condensed Unaudited Consolidating Balance Sheets [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Total current assets Goodwill and other intangible assets, net Investments in and advances to consolidated affiliates, net Due from Affiliate, Noncurrent Other long-term assets Total current liabilities Other long-term liabilities Liabilities, Other than Long-term Debt, Noncurrent Total equity Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Debt Long-term Debt [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] Non-cash interest expense, net Amortization of Debt Issuance Costs and Discounts Non-cash stock-based compensation expense Share-based Compensation Benefit from deferred income taxes Deferred Income Tax Expense (Benefit) Gains on sales of assets, net, including fixed assets held-for-sale 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 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 Billings in excess of costs and earnings 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: Payments of acquisition-related contingent consideration Proceeds from stock-based awards, net 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 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] Future amounts payable for acquisitions of businesses and other interests, contingent upon the future earnings performance of the acquired 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 Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, 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 (decrease), measurement period adjustments Acquisition-related contingent consideration liabilities, payments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Stock-based compensation awards, unearned compensation Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Stock-based compensation awards, unearned compensation, weighted average expected recognition period (in years) Employee Service Share-based Compensation, Nonvested Awards, Compensation 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 Accounts Receivable, Net of Allowance, and Contract Assets [Abstract] Accounts Receivable, Net, Current [Abstract] Contract billings Contract Receivable, Due in Next Twelve Months Less allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Accounts receivable, net of allowance Contract Receivables, Net of Allowance Amount billed to customers under contracts or programs to be collected in the next twelve months, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Excludes amounts due that have been withheld because of retainage provisions in a contract. Retainage Contract Receivable Retainage, Next Twelve Months Costs and earnings in excess of billings Costs in Excess of Billings, Current Retainage and costs and earnings in excess of billings (together, “contract assets”) Contract with Customer, Asset, Net, Current Accounts receivable, net Schedule of Goodwill by Segment Schedule of Goodwill [Table Text Block] Rollforward of Other Intangible Assets Intangible Assets Disclosure [Text Block]