FAIR VALUE MEASUREMENT - Fair Value Hierarchy Individual Investments (Details) - EBP 002 - USD ($)	Dec. 31, 2025	Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 887,825,471	$ 710,029,515
Fair Value, Inputs, Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	887,825,471	681,309,398
Fair Value Measured at Net Asset Value Per Share
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	28,720,117
Mutual funds \| Fair Value, Inputs, Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	604,034,466	516,591,992
MasTec, Inc. common stock
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	241,764,546	154,448,893
MasTec, Inc. common stock \| Fair Value, Inputs, Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	241,764,546	154,448,893
Money market funds \| Fair Value, Inputs, Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 42,026,459	$ 10,268,513

Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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