Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 112,457	$ 116,885	$ 254,334	$ 209,774
Other comprehensive (loss) income:
Foreign currency translation losses, net of tax	(1,278)	(616)	(64)	(1,753)
Unrealized (losses) gains on investment activity, net of tax	(1,041)	2,839	9,333	(21,447)
Comprehensive income	110,138	119,108	263,603	186,574
Comprehensive income attributable to non-controlling interests	1,370	394	2,147	48
Comprehensive income attributable to MasTec, Inc.	$ 108,768	$ 118,714	$ 261,456	$ 186,526