Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net income (loss) attributable to MasTec:
Net income (loss) - basic	$ 15,542	$ 16,212	$ (64,998)	$ (18,766)
Fair value gain related to resolved contingent payments	0	1,025	0	1,025
Net income (loss) - diluted	$ 15,542	$ 15,187	$ (64,998)	$ (19,791)
Weighted average shares outstanding:
Weighted average shares outstanding - basic (in shares)	77,635	74,445	77,306	74,615
Dilutive common stock equivalents (in shares)	737	1,092	0	32
Weighted average shares outstanding - diluted (in shares)	78,372	75,537	77,306	74,647
Anti-dilutive common stock (in shares)	2	178	1,147	1,273
Former Owner Of Acquired Business
Weighted average shares outstanding:
Weighted average shares outstanding - basic (in shares)	88	132	88	101
Dilutive common stock equivalents (in shares)		1		32