Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 75,765	$ 56,827	$ 141,877	$ 92,889
Other comprehensive (loss) income:
Foreign currency translation gains (losses), net of tax	843	(840)	1,214	(1,137)
Unrealized (losses) gains on investment activity, net of tax	(3,465)	(1,325)	10,374	(24,286)
Comprehensive income	73,143	54,662	153,465	67,466
Comprehensive income (loss) attributable to non-controlling interests	314	(178)	777	(346)
Comprehensive income attributable to MasTec, Inc.	$ 72,829	$ 54,840	$ 152,688	$ 67,812