Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 116,885	$ 130,082	$ 209,774	$ 293,411
Other comprehensive (loss) income:
Foreign currency translation losses, net of tax	(616)	(334)	(1,753)	(321)
Unrealized gains (losses) on investment activity, net of tax	2,839	(7,108)	(21,447)	(21,302)
Comprehensive income	119,108	122,640	186,574	271,788
Comprehensive income attributable to non-controlling interests	394	1,486	48	1,993
Comprehensive income attributable to MasTec, Inc.	$ 118,714	$ 121,154	$ 186,526	$ 269,795