Condensed Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 120,223	$ 80,401	$ 163,330	$ 106,864
Other comprehensive income (loss):
Foreign currency translation gains (losses), net of tax	113	(1,652)	13	(2,175)
Unrealized (losses) gains on equity investee activity, net of tax	(8,732)	2,937	(14,194)	10,653
Comprehensive income	111,604	81,686	149,149	115,342
Comprehensive income (loss) attributable to non-controlling interests	513	(91)	507	(188)
Comprehensive income attributable to MasTec, Inc.	$ 111,091	$ 81,777	$ 148,642	$ 115,530