Condensed Unaudited Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue		$ 1,939,006	$ 1,617,804	$ 3,457,346	$ 3,014,638
Costs of revenue, excluding depreciation and amortization		1,633,400	1,366,584	2,945,448	2,603,883
Depreciation and amortization		59,944	51,676	118,975	101,615
General and administrative expenses		70,819	67,602	143,436	131,224
Interest expense, net		16,623	20,795	38,881	37,854
Equity in earnings of unconsolidated affiliates		(6,551)	(5,824)	(12,811)	(11,409)
Other expense (income), net		4,812	788	8,317	(2,301)
Income before income taxes		159,959	116,183	215,100	153,772
Provision for income taxes		(39,736)	(35,782)	(51,770)	(46,908)
Net income		120,223	80,401	163,330	106,864
Net income (loss) attributable to non-controlling interests		513	(91)	507	(188)
Net income attributable to MasTec, Inc.	[1]	$ 119,710	$ 80,492	$ 162,823	$ 107,052
Earnings per share (Note 2):
Basic earnings per share (in dollars per share)		$ 1.59	$ 1.02	$ 2.17	$ 1.34
Basic weighted average common shares outstanding		75,183	78,984	75,088	80,061
Diluted earnings per share (in dollars per share)		$ 1.58	$ 1.01	$ 2.15	$ 1.32
Diluted weighted average common shares outstanding		75,747	80,062	75,661	81,136

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