Condensed Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 120,542	$ 64,201	$ 227,406	$ 188,160
Other comprehensive income (loss):
Foreign currency translation gains (losses), net of tax	1,230	641	(945)	2,415
Unrealized gains (losses) on equity investee activity, net of tax	3,137	808	13,790	(1,287)
Comprehensive income	124,909	65,650	240,251	189,288
Comprehensive (loss) income attributable to non-controlling interests	(124)	449	(312)	1,770
Comprehensive income attributable to MasTec, Inc.	$ 125,033	$ 65,201	$ 240,563	$ 187,518