Entity tax identification number Entity Tax Identification Number 3 Years Of Vesting Service 3 Years Of Vesting Service [Member] 3 Years Of Vesting Service Rollovers EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Forfeited nonvested account, decrease from administrative expense EBP, Forfeited Nonvested Account, Decrease from Administrative Expense Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual funds Mutual Fund [Member] Total Fully Corrected Under VFCP* and PTE** 2002-51 EBP, Schedule of Delinquent Participant Contribution, Corrected Liability to participant EBP, Liability to Participant Investment sold, excluding plan interest in master trust, cost EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Receivable from participant, account, maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount FAIR VALUE MEASUREMENT EBP, Investment, Fair Value and NAV [Text Block] Note receivable from participant, account, primary residence, maximum borrowing term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term Investments, at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Participant loan, cost EBP, Asset Held for Investment, Participant Loan, Cost EBP, Asset Held for Investment, Participant Loan, Cost Money market funds Money Market Funds [Member] Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 1 [Member] Employee withholdings, interest accrued EPB, Employee Withholdings, Interest Accrued EPB, Employee Withholdings, Interest Accrued EBP, Investment, Fair Value and NAV [Abstract] Total Assets EBP, Asset Statistical Measurement [Axis] Statistical Measurement [Axis] Additions to net assets available for benefits attributed to: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Change in net asset available for benefit, transfer to (from) plan EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan Benefit Payments EBP, Payment to Participant [Policy Text Block] EBP, Trustee EBP, Trustee [Member] Total Liabilities EBP, Liability Amendment Flag Amendment Flag Basis of Presentation EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Due from Broker EBP, Investment Sale, Receivable Number of shares (in shares) EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] EBP, Vesting, Years Of Service [Axis] EBP, Vesting, Years Of Service [Axis] EBP, Vesting, Years Of Service Investments [Domain] Investments [Domain] EBP, Schedule of Delinquent Participant Contribution [Abstract] Use of Estimates EBP, Use of Estimate [Policy Text Block] Matching percentage funding, common stock EBP, Employer Contribution, Matching Percentage Funding, Common Stock EBP, Employer Contribution, Matching Percentage Funding, Common Stock EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Domain] SCHEDULE H, LINE 4i- SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] RISKS AND UNCERTAINTIES EBP, Risk and Uncertainty [Text Block] Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Matching percentage funding, cash EBP, Employer Contribution, Matching Percentage Funding, Cash EBP, Employer Contribution, Matching Percentage Funding, Cash EBP, Schedule of Delinquent Participant Contribution [Line Items] EBP, Schedule of Delinquent Participant Contribution [Line Items] EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Axis] Minimum Minimum [Member] EBP, Schedule of Reportable Transaction [Abstract] Investment Type [Axis] Investment Type [Axis] Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Participants EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Liabilities Liabilities [Abstract] Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] DESCRIPTION OF PLAN EBP, Description of Plan [Text Block] Contributions Pending Correction in VFCP* EBP, Schedule of Delinquent Participant Contribution, Pending Correction in VFCP EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] Notes receivable, amount transferred to (from) plan EBP, Notes Receivable, Amount Transferred To (From) Plan EBP, Notes Receivable, Amount Transferred To (From) Plan EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Interest income on notes receivable from plan participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment Contributions Receivable EBP, Contribution [Policy Text Block] MasTec, Inc. common stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase EBP, Schedule of Reportable Transaction [Table] EBP, Schedule of Reportable Transaction [Table] Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Total EBP, Asset Held for Investment Document Information [Line Items] Document Information [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] EBP, Schedule of Reportable Transaction [Line Items] EBP, Schedule of Reportable Transaction [Line Items] Net realized gains on sales EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Realized Gain (Loss) on Investment Note receivable from participant, general loan, minimum borrowing term EBP, Note Receivable From Participant, General Loan, Minimum Borrowing Term EBP, Note Receivable From Participant, General Loan, Minimum Borrowing Term EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Requisite service period EBP, Requisite Service Period EBP, Requisite Service Period NON-EXEMPT TRANSACTIONS EBP, Non-Exempt Transactions [Text Block] EBP, Non-Exempt Transactions Vesting service period EBP, Employer Contribution Vesting Service Period EBP, Employer Contribution Vesting Service Period 2 Years Of Vesting Service 2 Years Of Vesting Service [Member] 2 Years Of Vesting Service Plan termination, employer contribution, vesting percentage EBP, Plan Termination, Employer Contribution, Vesting Percentage EBP, Plan Termination, Employer Contribution, Vesting Percentage Contributions Corrected Outside VFCP* EBP, Schedule of Delinquent Participant Contribution, Corrected Outside VFCP EBP, Tax Status [Table] EBP, Tax Status [Table] Net increase in net assets available for benefits EBP, Change in Net Asset Available for Benefit, Increase (Decrease) RELATED-PARTY TRANSACTIONS AND PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Total Receivables EBP, Receivable Employer contributions EBP, Employer Contribution, Receivable Net unrealized appreciation in value on securities EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Unrealized Gain (Loss) on Investment Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Dividends EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Transferred late to plan EBP, Schedule of Delinquent Participant Contribution, Transferred Late to Plan Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Participant loan, basis spread on variable rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate Assets Assets [Abstract] EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] Due to Broker EBP, Liability for Investment Purchase EBP, Tax Status [Abstract] EBP, Vesting, Years Of Service [Domain] EBP, Vesting, Years Of Service [Domain] EBP, Vesting, Years Of Service [Domain] Note receivable from participant, general loan, maximum borrowing term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term Administrative Expenses EBP, Expense [Policy Text Block] Current Value EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] Participant contributions EBP, Participant Contribution, Receivable EBP, Schedule of Allocation, Income and Change in Plan Equity [Abstract] Document Type Document Type PLAN TERMINATION EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key Asset held for investment, participant loan, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Schedule of Allocation, Income and Change in Plan Equity [Line Items] EBP, Schedule of Allocation, Income and Change in Plan Equity [Line Items] EBP, Risk and Uncertainty [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] Deductions to net assets available for benefits attributed to: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Forfeited nonvested account, decrease from employer contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Notes receivable from participants EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name EBP, Vesting EBP, Vesting [Table Text Block] EBP, Vesting Investment acquired, excluding plan interest in master trust, cost EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost EBP, Subsequent Event [Abstract] SUBSEQUENT EVENTS EBP, Subsequent Event [Text Block] Vesting percentage EBP, Participant Accounts, Vesting Percentage EBP, Participant Accounts, Vesting Percentage SCHEDULE H, LINE 4a- SCHEDULE OF DELINQUENT DEPOSITS OF PARTICIPANT CONTRIBUTIONS EBP, Schedule of Delinquent Participant Contribution [Text Block] EBP, Schedule of Delinquent Participant Contribution [Table] EBP, Schedule of Delinquent Participant Contribution [Table] TAX STATUS EBP, Tax Status [Text Block] Note receivable from participant, account, maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Participant catch-up contribution, increase rate EBP, Participant Catch-Up Contribution, Increase Rate EBP, Participant Catch-Up Contribution, Increase Rate EBP, Participant-Directed and Nonparticipant-Directed Status [Domain] EBP, Participant-Directed and Nonparticipant-Directed Status [Domain] EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] EBP, Participant-Directed and Nonparticipant-Directed Status [Axis] EBP, Participant-Directed and Nonparticipant-Directed Status [Axis] Document Information [Table] Document Information [Table] EBP, Nonparticipant-Directed EBP, Nonparticipant-Directed [Member] EBP 002 EBP 002 [Member] EBP 002 Note Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Total investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment 1 year of Vesting Service 1 Year Of Vesting Service [Member] 1 Year Of Vesting Service EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Contributions Not Corrected EBP, Schedule of Delinquent Participant Contribution, Not Corrected Participant catch-up contribution, minimum age EBP, Participant Catch-Up Contribution, Minimum Age EBP, Participant Catch-Up Contribution, Minimum Age Net assets available for benefits Net assets available for benefits at beginning of year Net assets available for benefits at end of year EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] EBP, Schedule of Allocation, Income and Change in Plan Equity [Table] EBP, Schedule of Allocation, Income and Change in Plan Equity [Table] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Forfeited nonvested account EBP, Forfeited Nonvested Account Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]