Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net income attributable to MasTec:
Net income - basic	$ 48,896	$ 111,087	$ 30,130	$ 252,187
Fair value gain (loss) related to resolved contingent payments	143	0	1,459	0
Net income - diluted	$ 48,753	$ 111,087	$ 28,671	$ 252,187
Weighted average shares outstanding:
Weighted average shares outstanding - basic (in shares)	73,936	72,503	74,386	72,481
Dilutive common stock equivalents (in shares)	1,137	1,474	1,190	1,440
Weighted average shares outstanding - diluted (in shares)	75,073	73,977	75,576	73,921
Basic weighted average common shares outstanding (in shares)	73,936	72,503	74,386	72,481
Anti-dilutive common stock (in shares)	8	10	135	109
Dilutive common stock equivalents (in shares)	1,137	1,474	1,190	1,440
2021 Acquisition, Acquisition One | Former Owner Of Acquired Business
Weighted average shares outstanding:
Weighted average shares outstanding - basic (in shares)	140		114
Dilutive common stock equivalents (in shares)	11		37
Basic weighted average common shares outstanding (in shares)	140		114
Dilutive common stock equivalents (in shares)	11		37