Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income (loss) attributable to MasTec:
Net income (loss) - basic	$ 16,212	$ 75,451	$ (18,766)	$ 141,100
Fair value gain (loss) related to resolved contingent payments	1,025	0	1,025	0
Net income (loss) - diluted	$ 15,187	$ 75,451	$ (19,791)	$ 141,100
Weighted average shares outstanding:
Weighted average shares outstanding - basic (in shares)	74,445	72,501	74,615	72,470
Dilutive common stock equivalents (in shares)	1,092	1,475	32	1,443
Weighted average shares outstanding - diluted (in shares)	75,537	73,976	74,647	73,913
Basic weighted average common shares outstanding (in shares)	74,445	72,501	74,615	72,470
Anti-dilutive common stock (in shares)	178	1	1,273	2
Dilutive common stock equivalents (in shares)	1,092	1,475	32	1,443
2021 Acquisition, Acquisition One | Former Owner Of Acquired Business
Weighted average shares outstanding:
Weighted average shares outstanding - basic (in shares)	132		101
Dilutive common stock equivalents (in shares)	1		32
Basic weighted average common shares outstanding (in shares)	132		101
Dilutive common stock equivalents (in shares)	1		32