Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] 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 [Line Items] Goodwill [Line Items] Goodwill, acquired during period Goodwill, Acquired During Period Goodwill, measurement period adjustments Goodwill, Purchase Accounting Adjustments Goodwill, currency translation gains (losses) Goodwill, Foreign Currency Translation Gain (Loss) Segment Reporting [Abstract] Segments and Related Information Segment Reporting Disclosure [Text Block] Debt Disclosure [Abstract] Schedule of Carrying Values of Debt Schedule of Long-term Debt Instruments [Table Text Block] Accounting Policies [Abstract] 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, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Leases [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] Accounting Standards Update 2016-02 [Member] Accounting Standards Update 2016-02 [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Operating leases, additions Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Operating lease assets Operating Lease, Right-of-Use Asset 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 Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Non-Recurring [Table] Fair Value, Recurring and Nonrecurring [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Equity Investee [Member] Investee [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. 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 entities Number Of Entities Number of entities. Payments or expenses, related party Related Party Transaction, Expenses from Transactions with Related Party Payables, related party Accounts Payable, Related Parties Debt Long-term Debt [Text Block] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Management [Member] Management [Member] 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. Related Party Transaction [Line Items] Related Party Transaction [Line Items] Payments, related party Revenue, related party Revenue from Related Parties Receivables, net, related party Accounts Receivable, Related Parties Business Combinations [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] Communications and Electrical Transmission [Domain] Communications and Electrical Transmission [Member] Assets acquired pertain to the Communications and Electrical Transmission segments. 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. Electrical Transmission [Member] Electrical Transmission [Member] The engineering, construction and maintenance of electrical transmission lines and substations, primarily for the energy and utility industries. Scenario [Axis] Scenario [Axis] Scenario [Domain] Scenario [Domain] Forecast [Member] Forecast [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] 2020 Acquisitions [Member] 2020 Acquisitions [Member] Acquisitions completed during the year 2020. Measurement Input Type [Axis] Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Expected Term [Member] Measurement Input, Expected Term [Member] Business Acquisition [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, cash, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Business combinations, contingent consideration, earn-out period (in years) Business Combination, Contingent Consideration, Liability, Measurement Input Business combinations, contingent consideration, earn-out liabilities Business Combination, Contingent Consideration, Liability 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 Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies [Table] Loss Contingencies [Table] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Performance and Payment Bonds [Member] Performance Guarantee [Member] Financial Guarantees [Member] Financial Standby Letter of Credit [Member] Surety Bonds [Member] Surety Bond [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] 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] Product and Service [Axis] Insurance Policies By Type [Domain] Product and Service [Domain] Workers' Compensation, General and Automobile Policies [Member] Property, Liability and Casualty Insurance Product Line [Member] Employee Group Medical Claims [Member] Group Insurance Policy [Member] Workers' Compensation [Member] Accident and Health Insurance Product Line [Member] Other Long-Term Liabilities [Member] Other Noncurrent Liabilities [Member] Commitments and Contingencies [Line Items] Loss Contingencies [Line Items] Letters of credit issued Letters of Credit Outstanding, Amount 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 Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Cover [Abstract] 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 Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] 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 Four Point Five Percent Senior Notes [Member] Four Point Five Percent Senior Notes [Member] 4.50% Senior Notes Debt Instrument [Line Items] Debt Instrument [Line Items] Debt instrument, interest rate (percentage) Debt Instrument, Interest Rate, Stated Percentage Receivables [Abstract] Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Schedule of Goodwill by Segment Schedule of Goodwill [Table Text Block] Rollforward of Other Intangible Assets Intangible Assets Disclosure [Text Block] Standby Letters of Credit [Member] Standby Letters of Credit [Member] Other Credit Facilities [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] 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, interest rate (percentage) Line of Credit Facility, Interest Rate at Period End Business, Basis of Presentation and Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Property, Plant and Equipment [Abstract] Capitalized internal-use software, gross Capitalized Computer Software, Gross Capitalized internal-use software, net Capitalized Computer Software, Net Segments and Related Information [Table] Schedule of Segment Reporting Information, by Segment [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Revenue Benchmark [Member] Revenue Benchmark [Member] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] AT&T [Member] AT&T1 [Member] AT&T (including DIRECTV) (business name). Permian Highway Pipeline [Member] Permian Highway Pipeline [Member] Permian Highway Pipeline (business name) Equitrans Midstream Corporation/EQT Corporation [Member] Equitrans Midstream Corporation/EQT Corporation [Member] Equitrans Midstream Corporation/EQT Corporation (business name). Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Segments and Related Information [Line Items] Segment Reporting Information [Line Items] Concentration risk, percentage of total Concentration Risk, Percentage Schedule of Future Minimum Lease Commitments, Finance Leases Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] Schedule of Future Minimum Lease Commitments, Operating Leases Lessee, Operating Lease, Liability, Maturity [Table Text Block] Commitments and Contingencies Commitments Contingencies and Guarantees [Text Block] Unusual or Infrequent Items, or Both, COVID-19 Disclosure Unusual or Infrequent Items, or Both, Disclosure [Text Block] Contract billings Accounts Receivable, before Allowance for Credit Loss, Current Less allowance Accounts Receivable, Allowance for Credit Loss, Current Accounts receivable, net of allowance Accounts Receivable, after Allowance for Credit Loss, Current Contract Assets [Abstract] Contract with Customer, Asset, after Allowance for Credit Loss, Current [Abstract] Retainage ContractRetainage Amounts billed to customers under long-term contracts or programs that have been witheld because of retainage provisions in a contract. Unbilled receivables Unbilled Contracts Receivable Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] CCI [Member] Cross Country Infrastructure [Member] Cross Country Infrastructure Services, Inc. ("CCI") (business name). 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. Equipment [Member] Equipment [Member] 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 Receivables, related party Govermment [Member] Govermment [Member] Activities related to government transactions. 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] Revenue Revenues Property and equipment, net Property, Plant and Equipment, Net Intangible assets and goodwill, net Intangible Assets, Net (Including Goodwill) Finance Leases Finance Lease, Liability, Payment, Due [Abstract] 2020, remaining six months Finance Lease, Liability, to be Paid, Remainder of Fiscal Year 2021 Finance Lease, Liability, to be Paid, Year One 2022 Finance Lease, Liability, to be Paid, Year Two 2023 Finance Lease, Liability, to be Paid, Year Three 2024 Finance Lease, Liability, to be Paid, Year Four Thereafter Finance Lease, Liability, To be Paid, after Year Four Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid after the fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). 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 Lessee, Operating Lease, Liability, Payment, Due [Abstract] 2020, remaining six months Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year 2021 Lessee, Operating Lease, Liability, to be Paid, Year One 2022 Lessee, Operating Lease, Liability, to be Paid, Year Two 2023 Lessee, Operating Lease, Liability, to be Paid, Year Three 2024 Lessee, Operating Lease, Liability, to be Paid, Year Four Thereafter Lessee, Operating Lease, Liability, To be Paid, after Year Four Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid after the fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Total minimum lease payments Lessee, Operating Lease, Liability, to be Paid Less amounts representing interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Total lease obligations, net of interest Operating Lease, Liability Less current portion Operating Lease, Liability, Current Long-term portion of lease obligations, net of interest Operating Lease, Liability, Noncurrent 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. Power Generation and Industrial [Member] Clean Energy 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. Business combinations, contingent consideration, mandatorily redeemable non-controlling interest Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Guarantees and Product Warranties [Abstract] Other Guarantees [Table] Schedule of Guarantor Obligations [Table] 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. AVCT [Member] AVCT [Member] American Virtual Cloud Technologies, Inc. (“AVCT”) (business name) -- formerly known as Pensare Acquisition Corp. ("Pensare"). Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Common Stock [Member] Common Stock [Member] Initial Warrant [Member] Initial Warrant [Member] Initial Warrant [Member] Warrant [Member] Warrant [Member] Convertible Debt Securities [Member] Convertible Debt Securities [Member] Equity securities measured at fair value, shares Equity Securities Measured at Fair Value, Shares Amount of shares related to investment in equity securities measured at fair value with change in fair value recognized in net income (FV-NI) Derivative instruments, number held Derivative, Number of Instruments Held Warrants, exercise price (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Debt instrument convertible note principal amount Debt Instrument Convertible Note Principal Amount Principal amount of convertible debentures. Conversion price (in dollars per share) Debt Instrument, Convertible, Conversion Price Equity investment ownership percentage Equity Investment, Ownership Percentage The percentage of ownership of common stock or equity participation in an investee. Excludes proportionately consolidated investees and investees accounted for under the equity method of accounting. Beneficial ownership of all interests, percentage Beneficial Ownership Interest, Percentage The total percentage of beneficial ownership of common stock, debt and/or instruments or equity participation in an investee. Excludes proportionately consolidated investees and investees accounted for under the equity method of accounting. Equity investment and warrants, amount paid (in dollars) Payments to Acquire Long-term Investments Investment interest rate Investment Interest Rate Equity securities, fair value Equity Securities, FV-NI Equity investments, adjusted cost basis, amount Equity Securities without Readily Determinable Fair Value, Amount Net gain on investment Equity Securities, FV-NI, Unrealized Gain (Loss) Retirement Benefits [Abstract] Schedule of Covered Employees and Contributions, Multiemployer Plans Multiemployer Plan [Table 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] 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 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 Intangible Assets, Net (Excluding Goodwill) 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. Transfers in (out), non-amortizing intangible assets Indefinite-lived Intangible Assets, Transfer In (Out) Amount of transfer in (out) which increases (decreases) an asset, excluding financial assets and goodwill, lacking physical substance with an indefinite life. Transfers in (out), amortizing intangible assets Finite-lived Intangible Assets, Transfer In (Out) Amount of transfer in (out) which increases (decreases) an asset, excluding financial assets and goodwill, lacking physical substance with a finite life. Transfers in (out) Intangible Assets, Gross (Excluding Goodwill), Transfer In (Out) Amount of transfer in (out) which increases (decreases) an asset, excluding financial assets and goodwill, lacking physical substance. 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 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. Amortization expense Amortization of Intangible Assets Other intangible assets, non-amortizing, ending balance Other intangible assets, net, amortizing, ending balance Other intangible assets, net, ending balance Remaining amortization period (in years) Finite-Lived Intangible Assets, Remaining Amortization Period Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Reportable Segments [Member] Operating Segments [Member] Corporate [Member] Corporate, Non-Segment [Member] Other [Member] Other Segments [Member] Depreciation and Amortization: Depreciation, Depletion and Amortization [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] 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 Chairman, Board of Directors [Member] Board of Directors Chairman [Member] Chief Executive Officer [Member] Chief Executive Officer [Member] Executive Officers [Member] 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 Schedule of Earnings Per Share Information Schedule of Weighted Average Number of Shares [Table Text Block] Share-based Payment Arrangement [Abstract] Schedule of Stock-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] 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". Restricted Stock Units [Member] Restricted Stock Units (RSUs) [Member] Stock-Based Compensation and Other Employee Benefit Plans [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 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) Debt instrument, face amount Debt Instrument, Face Amount Schedule of Accounts Receivable, Net of Allowance, and Contract Assets Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Debt instrument, maturity date Debt Instrument, Maturity Date 4.875% Senior Notes, gross carrying amount Senior Notes 4.875% Senior Notes, estimated fair value Notes Payable, Fair Value Disclosure Number of operating segments Number of Operating Segments Number of reportable segments Number of Reportable Segments Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract] Revenue from Contract with Customer [Abstract] Revenue [Table] Disaggregation of Revenue [Table] Concentration Risk from Type of Arrangement [Member] Product Concentration Risk [Member] Type of Agreement [Axis] Type of Agreement [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] Disaggregation of Revenue [Line Items] 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. Other Retirement Plans Retirement Benefits [Text Block] Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 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] Depreciation Cost, Depreciation Amortization of intangible assets Cost, Amortization Non-cash interest expense, net Amortization of Debt Issuance Costs and Discounts Non-cash stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Benefit from deferred income taxes Deferred Income Tax Expense (Benefit) Equity in earnings of unconsolidated affiliates Income (Loss) from Equity Method Investments 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 Increase (Decrease) in Accounts Receivable Contract assets Increase (Decrease) in Contract with Customer, Asset 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 Contract with Customer, Liability Other liabilities, current and long-term portion Increase (Decrease) in Other Operating Liabilities Net cash provided by 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 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 Other investing activities, net Payments for (Proceeds from) Other Investing Activities 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) proceeds from 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 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 Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Effect of currency translation on cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Net (decrease) increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash and cash equivalents - beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents - end of period Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Income tax payments, net of refunds 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 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. Joint Venture Civil Construction Project [Member] Joint Venture Civil Construction Project[Member] [Domain] Ownership interest in a civil construction project. 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 Cash and Cash Equivalents, at Carrying Value 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". Number of pipelines in operation Number Of Pipelines In Operation Number of pipelines in operation at the balance sheet date. Equity method investments, equity in earnings (losses) 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 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 Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lease Contractual Term [Axis] Lease Contractual Term [Axis] Lease Contractual Term [Domain] Lease Contractual Term [Domain] Equipment Leases [Member] Equipment Leases [Member] Amount pertaining to leasing of equipment. Facility Leases [Member] Facility Leases [Member] Amount pertaining to leasing of facilities. Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Leases, remaining lease terms 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. Leases, 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. 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 Schedule of Property and Equipment, Net [Table] Property, Plant and Equipment [Table] Property and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Property and Equipment, Type [Domain] Long-Lived Tangible Asset [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 Schedule of Accounts Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] 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. Provisions for credit losses Accounts Receivable, Credit Loss Expense (Reversal) 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 Lease Agreements [Member] Lease Agreements [Member] Construction Services [Member] Construction Services [Member] Construction services. 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 Charges, related party Related Party Transaction, Other Revenues from Transactions with Related Party Equity [Abstract] 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. December 2018 Share Repurchase Program [Member] December 2018 Share Repurchase Program [Member] Share repurchase program authorized by the board of directors in December 2018. March 2020 Share Repurchase Program [Member] March 2020 Share Repurchase Program [Member] Share repurchase program authorized by the board of directors in March 2020. Equity, Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Treasury stock acquired, value Treasury Stock, Value, Acquired, Cost Method Treasury stock acquired (in shares) Treasury Stock, Shares, Acquired Share repurchase program, amount authorized, value Stock Repurchase Program, Authorized Amount Stock repurchase program, remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Employee Stock Purchase Plans [Member] Employee Stock [Member] 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. Equity Stockholders' Equity Note Disclosure [Text Block] Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] Equity method investment, ownership percentage Equity Method Investment, Ownership Percentage Equity investments, carrying value Equity investments, impairments Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Schedule of Covered Employees and Contributions, Multiemployer Plans [Table] Multiemployer Plan [Table] Low [Member] High [Member] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Pension Plan [Member] Pension Plan [Member] Multiemployer Plans, Other Multiemployer [Member] Other Postretirement Benefits Plan [Member] Covered Employees and Contributions, Multiemployer Plans [Line Items] Multiemployer Plan [Line Items] Multiemployer plans, covered employees (in number of employees) Multiemployer Plan, Number of Employees Covered Multiemployer Plan, Employer Contribution, Cost Multiemployer Plan, Employer Contribution, Cost Risks and Uncertainties [Abstract] Concentration Risk [Table] Concentration Risk [Table] Revenue [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/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. Accounting Changes and Error Corrections [Abstract] Accounting Standards Update and Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Accounting Standards Update [Axis] Accounting Standards Update [Axis] Accounting Standards Update [Domain] Accounting Standards Update [Domain] ASU 2018-15 [Member] Accounting Standards Update 2018-15 [Member] ASU 2018-13 [Member] Accounting Standards Update 2018-13 [Member] ASU 2016-13 [Member] Accounting Standards Update 2016-13 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Change in Accounting Principle, Accounting Standards Update, Adoption Date Change in Accounting Principle, Accounting Standards Update, Adoption Date Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] Effect of share repurchases, decrease in weighted average shares outstanding (in shares) EffectOfRepurchasesOnWeightedAverageSharesOutstanding The decrease in the Company's weighted average number of shares outstanding, as a result of current period(s) share repurchases. 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 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 on equity investee activity, net of tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive (loss) income 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 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] 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. Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Consolidated effective tax rate, percent Effective Income Tax Rate Reconciliation, Percent Effective income tax rate reconciliation, other adjustments, amount Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Stock-based compensation, vested awards, net tax benefits Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Credit Facility [Member] Domestic Line of Credit [Member] Revolving Loans [Member] Revolving Credit Facility [Member] Term Loan [Member] Loans Payable [Member] Foreign Denomination [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. Performance Standby [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 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 Line of credit facility, unused facility fee (percentage) Line of Credit Facility, Unused Capacity, Commitment Fee Percentage EBITDA Reconciliation: Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Interest expense, net EBITDA EBITDA Earnings before interest, taxes, depreciation and amortization ("EBITDA"), a non-U.S. GAAP financial measure. Schedule of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] 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 (loss) 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 Finance leases, assets, gross Finance Lease, Right-of-Use Asset, before Accumulated Amortization Finance leases, assets, net Finance Lease, Right-of-Use Asset, after Accumulated Amortization Finance leases, assets, depreciation Finance Lease, Right-of-Use Asset, Amortization Stock-Based Compensation and Other Employee Benefit Plans Share-based Payment Arrangement [Text Block] 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 Anti-dilutive common stock (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount EBITDA: Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] Lease Obligations Leases of Lessee Disclosure [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] Discount Rate [Member] Measurement Input, Discount Rate [Member] Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] Acquisition-related contingent consideration liabilities, estimated fair value Obligations, Fair Value Disclosure Acquisition-related contingent consideration liabilities, measurement input, discount rate 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), measurement period adjustments 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, payments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 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] 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 Line of credit facility, maturity date Line of Credit Facility, Expiration 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 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 Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Equity Method Investments Equity Method Investments [Policy Text Block] Unincorporated Entities, Proportional 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] Debt instruments, accrued interest payable (in dollars) Interest Payable, Current Goodwill, Net [Abstract] Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Goodwill, gross Goodwill, Gross Accumulated impairment loss Goodwill, Impaired, Accumulated Impairment Loss Goodwill, net Goodwill Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Accounts receivable, net of allowance Contract assets Inventories, net Inventory, Net Prepaid expenses Prepaid Expense, Current Other current assets Other Assets, Current Total current assets Assets, Current Operating lease assets Goodwill, net Other intangible assets, net 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 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 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 - 92,665,097 and 91,909,430 (including 1,734,554 and 1,221,593 of unvested stock awards) as of June 30, 2020 and December 31, 2019, 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: 18,941,926 shares and 15,344,917 shares as of June 30, 2020 and December 31, 2019, 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 Income Statement [Abstract] Costs of revenue, excluding depreciation and amortization Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization General and administrative expenses General and Administrative Expense Equity in earnings of unconsolidated affiliates Other (income) expense, net Nonoperating Income (Expense) Provision for income taxes Income Tax Expense (Benefit) Net income Net (loss) income 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) 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 Fair Value of Financial Instruments Fair Value Disclosures [Text Block] 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] Condensed Unaudited 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) Net income (loss) Other comprehensive 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, Net of Forfeitures Issuance 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 Noncontrolling interest, increase from subsidiary equity issuance Noncontrolling Interest, Increase from Subsidiary Equity Issuance Ending balance, common shares outstanding (in shares) Ending balance Ending balance, treasury shares (in shares)