Condensed Unaudited Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenue		$ 1,617,804	$ 1,890,180	$ 3,014,638	$ 3,048,364
Costs of revenue, excluding depreciation and amortization		1,366,584	1,626,335	2,603,883	2,597,469
Depreciation and amortization		51,676	45,379	101,615	88,282
General and administrative expenses		67,602	70,823	131,224	135,604
Interest expense, net		20,795	14,791	37,854	27,388
Equity in earnings of unconsolidated affiliates		(5,824)	(6,060)	(11,409)	(7,706)
Other expense (income), net		788	146	(2,301)	576
Income before income taxes		116,183	138,766	153,772	206,751
Provision for income taxes		(35,782)	(55,434)	(46,908)	(82,792)
Net income		80,401	83,332	106,864	123,959
Net (loss) income attributable to non-controlling interests		(91)	1,664	(188)	1,321
Net income attributable to MasTec, Inc.	[1]	$ 80,492	$ 81,668	$ 107,052	$ 122,638
Earnings per share (Note 2):
Basic earnings per share (in dollars per share)		$ 1.02	$ 1.01	$ 1.34	$ 1.52
Basic weighted average common shares outstanding		78,984	80,925	80,061	80,812
Diluted earnings per share (in dollars per share)		$ 1.01	$ 0.99	$ 1.32	$ 1.49
Diluted weighted average common shares outstanding		80,062	82,292	81,136	82,226

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