Condensed Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 80,401	$ 83,332	$ 106,864	$ 123,959
Other comprehensive income (loss):
Foreign currency translation (losses) gains, net of tax	(1,652)	595	(2,175)	1,774
Unrealized gains (losses) on equity investee activity, net of tax	2,937	(2,730)	10,653	(2,095)
Comprehensive income	81,686	81,197	115,342	123,638
Comprehensive (loss) income attributable to non-controlling interests	(91)	1,664	(188)	1,321
Comprehensive income attributable to MasTec, Inc.	$ 81,777	$ 79,533	$ 115,530	$ 122,317