Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Chairman, Board of Directors [Member] Board of Directors Chairman [Member] Chief Executive Officer [Member] Chief Executive Officer [Member] Executive Officers [Member] Executive Officer [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Long-Term Assets [Member] Other Noncurrent Assets [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Payments for life insurance policies Payment to Acquire Life Insurance Policy, Investing Activities Life insurance assets, carrying amount Cash Surrender Value of Life Insurance 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] 2016 Share Repurchase Program [Member] 2016 Share Repurchase Program [Member] Share repurchase plan authorized by the board of directors in 2016. 2018 Share Repurchase Program [Member] 2018 Share Repurchase Program [Member] Share repurchase program authorized by the board of directors in March 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 Condensed Unaudited Financial Statements, Supplemental Guarantor Information [Abstract] -- None. No documentation exists for this element. -- 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 Repayments of other borrowings and capital lease obligations Repayments of Other Debt Payments of acquisition-related contingent consideration Payment for Contingent Consideration Liability, Financing Activities Repurchase of common stock Payments for Repurchase of Common Stock Distributions to non-controlling interests Payments to Noncontrolling Interests Proceeds from stock-based awards, net Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Other financing activities Proceeds from (Payments for) Other Financing Activities Net financing activities and advances from (to) consolidated affiliates Net Financing Activities And Advances From (To) Consolidated Affiliates The cash inflow (outflow) from financing activities and (advances to) collection of money previously advanced to consolidated entities. Net cash 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 decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents - beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents - end of period Multiemployer Plans [Abstract] Schedule of Covered Employees and Contributions, Multiemployer Plans [Table] Schedule of Multiemployer Plans [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Workforce Subject to Collective Bargaining Arrangements [Member] Workforce Subject to Collective Bargaining Arrangements [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Unionized Employees [Member] Unionized Employees Concentration Risk [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Low [Member] Minimum [Member] High [Member] Maximum [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 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] Credit Facility [Member] Domestic Line of Credit [Member] Senior Notes [Member] Senior Notes [Member] Capital Lease Obligations [Member] Capital Lease Obligations [Member] Other Debt Obligations [Member] Notes Payable, Other Payables [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Loans [Member] Revolving Credit Facility [Member] Term Loan [Member] Loans Payable [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 4.875% Senior Notes [Member] Four Point Eight Seven Five Percent Senior Notes [Member] 4.875% Senior Notes Debt Instrument [Line Items] Debt Instrument [Line Items] Line of credit facility, maturity date Line of Credit Facility, Expiration Date Long-term debt obligations Long-term Debt, Gross Debt instrument, interest rate (percentage) Debt Instrument, Interest Rate, Stated Percentage Debt instrument, maturity date Debt Instrument, Maturity Date Debt instrument, weighted average interest rate (percentage) Debt, Weighted Average Interest Rate Capital lease obligations, expiration date, range, end Lease Expiration Date Capital lease obligations Capital Lease Obligations 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 and Capital Lease Obligations, Current Long-term debt Long-term Debt and Capital Lease Obligations 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] Segments [Axis] Segments [Axis] Segments [Domain] 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. 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. 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. Other [Member] Other Segments [Member] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Revenue [Member] Sales Revenue, Services, Net [Member] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] 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) Revenues Utilities customers, percentage of Communications segment revenue Concentration Risk, Percentage Property, Plant and Equipment [Abstract] Schedule of Property and Equipment, Net [Table] Property, Plant and Equipment [Table] Property and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land [Member] Land [Member] Building and Leasehold Improvements [Member] Building and Building Improvements [Member] Machinery and Equipment [Member] Machinery and Equipment [Member] Office Furniture and Equipment [Member] Furniture and Fixtures [Member] Construction in Progress [Member] Construction in Progress [Member] Property and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property and equipment Property, Plant and Equipment, Gross Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Property, Plant and Equipment, Net Schedule of Carrying Values of Debt Schedule of Long-term Debt Instruments [Table Text Block] Letters of Credit [Member] Letter of Credit [Member] Weighted Average [Member] Weighted Average [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] Commercial and/or Financial Standby [Member] Financial Standby Letter of Credit [Member] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Line of credit facility, term loan, frequency of payments Line of Credit Facility, Frequency of Payments 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, interest rate (percentage) Line of Credit Facility, Interest Rate at Period End Line of credit facility, letters of credit issued Letters of Credit Outstanding, Amount 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 Line of credit facility, collateral, description Line of Credit Facility, Collateral Share-based Compensation [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] Common Stock [Member] Common Stock [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Restricted Shares [Member] Restricted Stock And Restricted Stock Units [Member] Stock including a provision that prohibits sale or substantive sale of an equity instrument for a specified period of time or until specified performance conditions are met ("Restricted Stock") or share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met ("Restricted Stock Units"). Restricted Stock 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) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 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) Accounting Policies [Abstract] Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract] Number of reportable segments Number of Reportable Segments Revenue Recognition [Abstract] Revenue from Contract with Customer [Abstract] Revenue [Table] Disaggregation of Revenue [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU 2014-09 [Member] Accounting Standards Update 2014-09 [Member] ASU 2016-15 [Member] Accounting Standards Update 2016-15 [Member] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Domain] Initial Application Period Cumulative Effect Transition [Domain] Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Difference between Revenue Guidance in Effect before and after Topic 606 [Member] 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] Maximum [Member] Scenario [Axis] Scenario [Axis] Scenario [Domain] Scenario, Unspecified [Domain] Plan [Member] Scenario, Plan [Member] Revenue [Line Items] Disaggregation of Revenue [Line Items] Retained earnings, cumulative effect recognized on intial application of the new guidance Retained Earnings (Accumulated Deficit) Concentration risk, percentage of total 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 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 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. Payments for contingent consideration liabilities, operating activities, reclassification adjustment Payment for Contingent Consideration Liability, Operating Activities Joint Venture [Member] Corporate Joint Venture [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Pacer [Member] Pacer [Member] Pacer Construction Holdings Corporation and its affiliated operating companies ("Pacer") (business name). Currency [Axis] Currency [Axis] All Currencies [Domain] All Currencies [Domain] Canadian Dollars [Member] Canada, Dollars Performance Guarantee [Member] Performance Guarantee [Member] Proportionately consolidated non-controlled joint venture, ownership percentage Proportionately Consolidated Joint Venture Ownership Percentage The percentage interest in a proportionately consolidated joint venture. Revenue, related party Revenue from Related Parties Accounts receivable, net of BIEC, related parties Accounts Receivable, Net Of Billings In Excess Of Costs, Related Parties Amount of accounts receivable, net of billings in excess of costs, arising from transactions with related parties. Receivables are the amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Includes contract assets, net. Billings in excess of costs is the liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date. Guarantees issued, related party Guarantor Obligations, Maximum Exposure, Undiscounted Financing or amounts advanced, related party Payments for Advance to Affiliate Employee Stock Purchase Plans [Member] Employee Stock [Member] Stock-Based Compensation and Other Employee Benefit Plans [Line Items] Stock-based compensation plans, description Share-based Compensation Arrangement by Share-based Payment Award, Description Income Tax Disclosure [Abstract] Quarterly provision for income taxes, description Quarterly Financial Information, Income Taxes, Significant Variation, Description U.S. corporate tax rate (percentage) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Change in tax rate, non-cash tax benefit (expense) (in dollars) Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Supplemental Guarantor Financial Information Condensed Financial Statements [Text Block] Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Restricted Stock Awards [Member] Restricted Stock [Member] 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) Treasury stock, shares Treasury Stock, Common, Shares 2017 Acquisitions [Member] 2017 Acquisitions [Member] Acquisitions completed during the year 2017. Equity Method Investee [Member] Equity Method Investee [Member] Equity method investment, ownership percentage Equity Method Investment, Ownership Percentage Amounts outstanding, net, related party Due from Affiliates Fair Value Disclosures [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. Equity Investee [Member] Investee [Member] Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Number of pipelines in operation Number Of Pipelines In Operation Number of pipelines in operation at the balance sheet date. Equity method investments, equity contributions Payments to Acquire Equity Method Investments Letters of credit issued 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 Proceeds from Equity Method Investment, Distribution Equity method investments, net investment Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Revenue, related parties Receivables, net of BIEC, related parties Unrealized gains (losses) on equity method investee activity Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Unrealized gains (losses) on equity method investee activity, net of tax Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Earnings Per Share [Abstract] Schedule of Earnings Per Share Information Schedule of Weighted Average Number of Shares [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments Contingencies and Guarantees [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Business Combinations [Abstract] Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] 2018 Power Generation and Industrial Acquisition A [Member] Power Generation And Industrial Acquisition A In 2018 [Member] Power Generation and Industrial acquisition A completed in 2018. 2018 Power Generation and Industrial Acquisition B [Member] Power Generation And Industrial Acquisition B In 2018 [Member] Power Generation and Industrial acquisition B completed in 2018. 2018 Acquisitions [Member] 2018 Acquisitions [Member] Acquisitions completed during the year 2018. Business Combinations [Line Items] Business Acquisition [Line Items] Business combinations, percentage of interests acquired Business Acquisition, Percentage of Voting Interests Acquired Business combinations, description of acquired entity Business Acquisition, Description of Acquired Entity Business combinations, cash paid (in dollars) Payments to Acquire Businesses, Gross Contingent consideration, earn-out liabilities Business Combination, Contingent Consideration, Liability Debt instrument, guarantees, description Debt Instrument, Collateral Management [Member] Management [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. Employee Leasing Arrangements [Member] Employment Contracts [Member] Service Agreements [Member] Service Agreements [Member] Lease Agreements [Member] Lease Agreements [Member] Supplier [Axis] Supplier [Axis] Supplier [Domain] Share-based Goods and Nonemployee Services Transaction, Supplier [Domain] Related Contractor or Supplier [Member] Related Contractor Or Supplier [Member] Contractor or supplier that has a related party relationship with the entity, either by ownership or management affiliation. Related Customer [Member] Related Customer [Member] Customer that has a related party relationship with the entity, either by ownership or management affiliation. Lease Arrangement, Type [Axis] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Domain] Lease Arrangement, Type [Domain] Aircraft [Member] Air Transportation Equipment [Member] 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 Payables, related party Accounts Payable, Related Parties Charges, related party Related Party Transaction, Other Revenues from Transactions with Related Party Receivables, related party Due from Related Parties Receivables, related party Accounts Receivable, Related Parties Stock-based compensation, number of shares available for future grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Guarantees and Product Warranties [Abstract] Other Guarantees [Table] Schedule of Guarantor Obligations [Table] Subsidiaries [Member] Subsidiaries [Member] Minimum [Member] Other Guarantees [Line Items] Guarantor Obligations [Line Items] Other guarantees, description Guarantor Obligations, Origin and Purpose General warranty, description Standard Product Warranty Description 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. 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) Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Property and Equipment [Member] Property, Plant and Equipment [Member] Capitalized internal-use software, gross Capitalized Computer Software, Gross Capitalized internal-use software, net Capitalized Computer Software, Net Depreciation and amortization Depreciation, Depletion and Amortization Business, Basis of Presentation and Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] 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, 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 Amortization of Intangible Assets Goodwill, Net [Abstract] Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Segments [Domain] Goodwill, gross Goodwill, Gross Accumulated impairment losses Goodwill, Impaired, Accumulated Impairment Loss Goodwill, net Goodwill 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 (used in) 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 Allocated Share-based Compensation Expense (Benefit from) provision for deferred income taxes Deferred Income Tax Expense (Benefit) Equity in earnings of unconsolidated affiliates 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 Book overdrafts Increase (Decrease) in Book Overdrafts Other liabilities, current and long-term portion Increase (Decrease) in Other Operating Liabilities Net cash provided by (used in) operating activities Cash flows from investing activities: Cash flows from financing activities: Repayments of other borrowings Repayments of Other Long-term Debt Payments of capital lease obligations Repayments of Long-term Capital Lease Obligations 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 (refunds) payments, net Income Taxes Paid, Net Supplemental disclosure of non-cash information: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Additions to acquisition-related contingent consideration Business Combination, Consideration Transferred, Liabilities Incurred Equipment acquired under capital lease and financing arrangements Capital Lease Obligations Incurred Accrued capital expenditures Capital Expenditures Incurred but Not yet Paid Other Accrued Expenses [Member] Accrued Liabilities [Member] Debt instruments, accrued interest payable (in dollars) Interest Payable, Current Income Statement [Abstract] Revenue 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, net Interest Revenue (Expense), 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 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. Net Income (Loss) Attributable to Parent Earnings per share (Note 2): Earnings Per Share, Basic and Diluted [Abstract] Basic earnings per share (in dollars per share) Earnings Per Share, Basic Basic weighted average common shares outstanding Weighted Average Number of Shares Outstanding, Basic Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Diluted weighted average common shares outstanding Weighted Average Number of Shares Outstanding, Diluted Leases [Abstract] Operating Leases [Table] Schedule of Operating Leased Assets [Table] 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 Leased Assets [Line Items] Operating Leased Assets [Line Items] Operating leases, term of contract (in years) Lessee, Operating Lease, Term of Contract Operating leases, rent and related expense (in dollars) Operating Leases, Rent Expense, Net Related Party Transactions Related Party Transactions Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Net income Other comprehensive income (loss): 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 gains (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 Immediate Family Member of Management [Member] Immediate Family Member of Management or Principal Owner [Member] Lease Agreements [Member] Construction Contracts [Member] Construction Contracts [Member] 2017 Oil and Gas Acquisition [Member] Oil And Gas 2017 Acquisition [Member] Oil and Gas acquisition completed in 2017. 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. Payments, related party Number of entities Number Of Entities Number of entities. Payments of acquisition-related contingent consideration Business combinations, liabilities assumed, notes payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities Repayments of notes payable Repayments of Notes Payable Document and Entity Information [Abstract] -- None. No documentation exists for this element. -- Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Registrant Name Entity Registrant Name Trading Symbol Trading Symbol Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Schedule of Covered Employees and Contributions, Multiemployer Plans Schedule of Costs of Retirement Plans [Table Text Block] Capital Leases [Table] Schedule of Capital Leased Assets [Table] Capital Leases [Line Items] Capital Leased Assets [Line Items] Assets held under capital lease, gross Capital Leased Assets, Gross Assets held under capital lease, net Capital Leases, Balance Sheet, Assets by Major Class, Net 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 Primary Segments [Member] Primary Segments [Member] Primary segments are those segments other than the Other segment and Corporate. Segment reporting information, factors used to identify entity's reportable segments Segment Reporting, Factors Used to Identify Entity's Reportable Segments Number of operating segments Number of Operating Segments Segment reporting information, description of products and services Segment Reporting Information, Description of Products and Services Segment reporting, description of all other segments Segment Reporting, Description of All Other Segments Project gains Project Gains Projects gains are defined as project revenue, less project costs of revenue, including project-related depreciation, in particular, on construction contracts accounted for under the cost-to-cost method, for which the recorded amounts require estimates of costs to complete. Project losses Loss on Contracts Condensed Income Statement [Table] Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items] Condensed Income Statements, Captions [Line Items] Interest expense (income), net Other expense (income), net (Provision for) benefit from income taxes 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 Comprehensive income (loss) Schedule of Goodwill by Segment Schedule of Goodwill [Table Text Block] Rollforward of Other Intangible Assets Intangible Assets Disclosure [Text Block] Schedule of Consideration Paid and Net Assets Acquired, Business Combinations Schedule of Business Acquisitions, by Acquisition [Table Text Block] Acquisition of Non-Controlling Interests [Member] Acquisition Of Noncontrolling Interest [Member] Acquisition of the remaining noncontrolling interest in a subsidiary. Distributions to non-controlling interests Number of subsidiaries, non-controlling interests Number Of Subsidiaries Number of consolidated subsidiaries reported by the Company. Payments to acquire remaining non-controlling interests Payments to Acquire Additional Interest in Subsidiaries 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] Other Equity Investments With Readily Determinable Fair Values Marketable Securities, Policy [Policy Text Block] Other Equity Investments Without Readily Determinable Fair Values Equity Securities without Readily Determinable Fair Value [Policy Text Block] Variable Interest Entities Consolidation, Variable Interest Entity, 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] EBITDA Reconciliation: Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract] Consolidated EBITDA EBITDA Earnings before interest, taxes, depreciation and amortization ("EBITDA"), a non-U.S. GAAP financial measure. Other Commitments [Table] Other Commitments [Table] 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. Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Advances on Project Work [Member] Construction Loans [Member] Other Commitments [Line Items] Other Commitments [Line Items] Cash, amounts held by proportionately consolidated non-controlled joint ventures Current liabilities, amounts due by proportionately consolidated non-controlled contractual joint ventures Other Liabilities, Current 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”). Equipment [Member] 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. 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 Receivables [Abstract] Schedule of Accounts Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest Expense [Member] Interest Expense [Member] 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, percent 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. Billings in excess of costs and earnings Billings in Excess of Cost, Current Revenue recognition, BIEC, revenue recognized Contract with Customer, Liability, Revenue Recognized Contract liabilities Contract with Customer, Liability, Current Provisions for doubtful accounts Provision for Doubtful Accounts 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. Non-recourse financing arrangements, discount charge Gain (Loss) on Sale of Accounts Receivable Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Condensed Unaudited Consolidating Balance Sheets [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Assets Assets [Abstract] Total current assets Assets, Current Property and equipment, net Goodwill and other intangible assets, net Intangible Assets, Net (Including Goodwill) Investments in and advances to consolidated affiliates, net Due from Affiliate, Noncurrent Other long-term assets Other Assets, Noncurrent Total assets Assets Liabilities and equity Liabilities and Equity [Abstract] Total current liabilities Liabilities, Current Other long-term liabilities Liabilities, Other than Long-term Debt, Noncurrent Total liabilities Liabilities Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and equity Liabilities and Equity Debt Long-term Debt [Text Block] 4.875% Senior Notes, gross carrying amount Senior Notes 4.875% Senior Notes, estimated fair value Notes Payable, Fair Value Disclosure Acquisition consideration: Business Combination, Consideration Transferred [Abstract] Cash Fair value of contingent consideration (earn-out liability) Total consideration transferred Business Combination, Consideration Transferred Identifiable assets acquired and liabilities assumed: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Current assets, primarily composed of accounts receivable and $2.8 million of cash acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Cash acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Property and equipment and other long-term assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Amortizing intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Current liabilities, including current portion of capital lease obligations and long-term debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Long-term debt, including capital lease obligations Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Deferred income taxes and other long-term liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Total identifiable net assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Goodwill Total net assets acquired, including goodwill Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Corporate [Member] Corporate, Non-Segment [Member] Depreciation and Amortization: Depreciation, Depletion and Amortization [Abstract] Schedule of Earnings Per Share [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Earnings Per Share [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] 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 Dilutive common stock equivalents (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Weighted average shares outstanding - diluted Additional information: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Weighted average anti-dilutive common stock equivalents (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities Loans, Notes, Trade and Other Receivables Disclosure [Text Block] 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] Schedule of Non-Cash Stock-Based Compensation Expense and Related Tax Effects Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by 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] Other Intangible Assets [Line Items] Intangible Assets [Line Items] Line items for intangible assets, excluding goodwill. Other intangible assets, non-amortizing, carrying amount 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, other intangible assets 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, other intangible assets Intangible Assets Excluding Goodwill, Purchase Accounting Adjustments Amount of increase (decrease) to intangible assets, excluding goodwill, from purchase accounting adjustments. Amortization expense Currency translation adjustments, non-amortizing intangible assets Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss) Currency translation adjustments, amortizing intangible assets Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) Currency translation adjustments, other intangible assets 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 Current assets: Assets, Current [Abstract] Cash and cash equivalents 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 Goodwill, net Other intangible assets, net Other long-term assets Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued salaries and wages Employee-related Liabilities, Current Other accrued expenses Accrued Liabilities, Current Other current liabilities Total current liabilities Deferred income taxes Deferred Income Tax Liabilities, Net Other long-term liabilities Other Liabilities, Noncurrent 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 - 91,080,280 and 90,935,584 (including 1,480,582 and 1,421,041 of unvested stock awards) as of June 30, 2018 and December 31, 2017, respectively Common Stock, Value, Issued Capital surplus Additional Paid in Capital, Common Stock Retained earnings Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Treasury stock, at cost: 10,835,749 and 8,132,811 shares as of June 30, 2018 and December 31, 2017, 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 Stock-Based Compensation and Other Employee Benefit Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Income Taxes Income Tax Disclosure [Text Block] 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 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] 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, 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 Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Acquisition-related contingent consideration liabilities, range of potential earn-out liabilities, maximum unlimited Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Maximum Unlimited 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, (decrease) increase, measurement period adjustments Acquisition-related contingent consideration liabilities, increase (decrease), loss (gain) recorded in earnings 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 Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] Equity investment, adjusted cost basis, amount Equity Securities without Readily Determinable Fair Value, Amount Carrying value, equity investments EBITDA: Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] EBITDA 2017 Communications Acquisition [Member] Communications Acquisition In 2017 [Member] Communications acquisition completed in 2017. 2017 Power Generation and Industrial Acquisition [Member] Power Generation And Industrial Acquisition In 2017 [Member] Power Generation and Industrial acquisition completed in 2017. Customer Relationships [Member] Customer Relationships [Member] Backlog [Member] Order or Production Backlog [Member] 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 combinations, number of acquisitions Number of Businesses Acquired Business combinations, acquired amortizing intangible assets, weighted average useful life (in years) Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Business combinations, goodwill recognized, description Business Combination, Goodwill Recognized, Description Business combinations, goodwill, expected tax deductible amount (in dollars) Business Acquisition, Goodwill, Expected Tax Deductible Amount Business combinations, contingent consideration, basis for amount Business Combination, Contingent Consideration Arrangements, Basis for Amount Business combinations, contingent consideration, earn-out period (in years) Business Combination, Contingent Consideration, Liability, Measurement Input Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low (in dollars) Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high (in dollars) Business combinations, contingent consideration liabilities, range of potential earn-out liabilities, maximum unlimited Segments and Related Information Segment Reporting Disclosure [Text Block] 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] Equity Stockholders' Equity Note Disclosure [Text Block] Schedule of Financial Information by Reportable Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Reconciliation of Consolidated Income before Income Taxes to EBITDA Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Schedule of Significant Customers, Revenue Concentration Information Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] 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] 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] Disclosed Customers with Highest 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 Highest 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 Highest 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 Highest 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. 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. Business Combinations, Unaudited Pro Forma Information [Abstract] Business Acquisition, Pro Forma Information [Abstract] Business combinations, unaudited pro forma revenue Business Acquisition, Pro Forma Revenue Business combinations, unaudited pro forma net income Business Acquisition, Pro Forma Net Income (Loss) Business combinations, unaudited pro forma information, description Business Acquisition, Pro Forma Information, Description Business combinations, acquisition-related results, revenue Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Business combinations, acquisition-related results, net income Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Lifeshield [Member] Lifeshield [Member] Lifeshield, LLC ("Lifeshield") (Business name) 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). 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 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 Earnings Per Share Earnings Per Share [Text Block] Investments [Member] Investments [Member] Other investment, changes in expected recovery estimates, expense Gain (Loss) on Investments Other investment, proceeds related to ongoing liquidation Other investment, net carrying value Other Credit Facilities [Member] Foreign Line of Credit [Member] Line of credit facility, maximum borrowing capacity (in dollars) Long-term debt obligations (in dollars) Debt instrument, rationale for classification as long-term debt Line of Credit Facility, Rationale for Classification as Long-term Debt Other Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Commitments and Contingencies [Table] Loss Contingencies [Table] Performance and Payment Bonds [Member] Financial Guarantees [Member] Surety Bond [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 Policies [Member] Group Insurance Policies [Member] Workers' Compensation [Member] Accident and Health Insurance Product Line [Member] Other Long-Term Liabilities [Member] Other Noncurrent Liabilities [Member] Collateral [Axis] Collateral [Domain] Cash [Member] Cash [Member] Commitments and Contingencies [Line Items] Loss Contingencies [Line Items] Outstanding bonds, amount Bonded projects, estimated costs to complete Estimated Costs To Complete Projects Secured By Bonds Reflects the amount of estimated costs to complete projects that are secured by outstanding performance and/or payment bonds as of the balance sheet date. Self-insurance reserve Self Insurance Reserve Self-insurance reserve, non-current Self Insurance Reserve, Noncurrent Cash collateral held by insurance carriers Deposit Assets Lease Obligations Leases of Lessee Disclosure [Text Block] Schedule of Accounts Receivable, Net of Allowance, and Contract Assets Contract with Customer, Asset and Liability [Table Text Block] General and Administrative Expenses [Member] General and Administrative Expense [Member] Prospective Adoption of New Accounting Pronouncements [Axis] Prospective Adoption of New Accounting Pronouncements [Axis] Accounting Guidance [Domain] Accounting Guidance [Domain] Share-Based Compensation [Member] Accounting Standards Update 2016-09 [Member] Income Tax Effects: Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] Income tax effect of non-cash stock-based compensation Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Excess tax benefit from non-cash stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Tax benefits (deficiencies), net Multiemployer plans, general nature Multiemployer Plans, General Nature Computation of earnings per share, methodology Earnings Per Share Reconciliation Disclosure Effect of share repurchases, decrease in weighted average shares outstanding (in shares) Effect Of Repurchases On Weighted Average Shares Outstanding The decrease in the Company's weighted average number of shares outstanding, as compared with the respective prior year period(s), as a result of current period(s) share repurchases. Fair Value of Financial Instruments Fair Value Disclosures [Text Block]