Quarterly Information (Unaudited) (Schedule of Quarterly Financial Information (Unaudited)) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Revenue	$ 1,341,900	$ 1,586,200	$ 1,232,400	$ 974,200	$ 1,027,400	$ 1,111,000	$ 1,066,600	$ 1,003,300	$ 5,134,703	$ 4,208,330	$ 4,611,803
Costs of revenue, excluding depreciation and amortization	1,120,600	1,369,000	1,068,200	884,400	916,300	972,700	945,900	886,400	4,442,125	3,721,303	3,977,963
Net (loss) income	55,900	56,500	24,400	(2,900)	(76,900)	7,400	(3,800)	(6,400)	134,035	(79,703)	122,001
Net (loss) income attributable to MasTec, Inc.	$ 53,600	$ 56,300	$ 24,100	$ (2,700)	$ (76,700)	$ 7,600	$ (3,700)	$ (6,300)	$ 131,263	$ (79,110)	$ 115,923
(Loss) earnings per share from continuing operations:
Basic (in dollars per share)	$ 0.67	$ 0.70	$ 0.30	$ (0.03)	$ (0.96)	$ 0.10	$ (0.05)	$ (0.08)	$ 1.63	$ (0.98)	$ 1.53
Diluted (in dollars per share)	$ 0.66	$ 0.69	$ 0.30	$ (0.03)	$ (0.96)	$ 0.09	$ (0.05)	$ (0.08)	$ 1.61	$ (0.98)	$ 1.42