Condensed Unaudited Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue		$ 1,977,227	$ 1,955,752	$ 4,991,865	$ 5,004,116
Costs of revenue, excluding depreciation and amortization		1,681,438	1,726,173	4,285,320	4,323,642
Depreciation and amortization		54,863	50,101	156,478	138,384
General and administrative expenses		80,311	66,397	211,535	202,001
Interest expense, net		22,330	17,578	60,183	44,966
Equity in earnings of unconsolidated affiliates		(7,671)	(7,399)	(19,080)	(15,105)
Other expense (income), net		323	(4,677)	(1,976)	(4,102)
Income before income taxes		145,633	107,579	299,405	314,330
Provision for income taxes		(25,091)	(43,378)	(71,999)	(126,170)
Net income		120,542	64,201	227,406	188,160
Net (loss) income attributable to non-controlling interests		(124)	449	(312)	1,770
Net income attributable to MasTec, Inc.	[1]	$ 120,666	$ 63,752	$ 227,718	$ 186,390
Earnings per share (Note 2):
Basic earnings per share (in dollars per share)		$ 1.55	$ 0.79	$ 2.87	$ 2.31
Basic weighted average common shares outstanding		78,096	80,953	79,399	80,859
Diluted earnings per share (in dollars per share)		$ 1.52	$ 0.77	$ 2.83	$ 2.27
Diluted weighted average common shares outstanding		79,201	82,386	80,484	82,281

[1] Calculated as total net income less amounts attributable to non-controlling interests.