Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net income (loss) attributable to MasTec:
Net income (loss) - basic	$ 14,296	$ 48,896	$ (50,702)	$ 30,130
Fair value gain related to resolved contingent payments	0	143	0	1,459
Net income (loss) - diluted	$ 14,296	$ 48,753	$ (50,702)	$ 28,671
Weighted average shares outstanding:
Weighted average shares outstanding - basic (in shares)	77,640	73,936	77,418	74,386
Dilutive common stock equivalents (in shares)	815	1,137	0	1,190
Weighted average shares outstanding - diluted (in shares)	78,455	75,073	77,418	75,576
Anti-dilutive common stock (in shares)	0	8	1,091	135
Former Owner Of Acquired Business
Weighted average shares outstanding:
Weighted average shares outstanding - basic (in shares)	88	140	88	114
Dilutive common stock equivalents (in shares)	0	11	0	37