Quarterly Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 1,159,100		$ 1,269,400		$ 977,600		$ 918,600		$ 932,400		$ 1,067,300		$ 988,900		$ 738,300		$ 4,324,787		$ 3,726,789		$ 2,831,292
Net income from continuing operations	42,900		49,900		35,500		19,300		37,700		36,100		31,200		11,700		147,672		116,639		97,456
Net (loss) income from discontinued operations	(1,300)		(3,700)		(500)		(900)		(1,400)		(9,300)		(1,100)		2,500		(6,456)		(9,223)		8,516
Net income (loss) attributable to non-controlling interests	100		100		100		0		0		0		0		0		266		(10)		(29)
Net income attributable to MasTec, Inc.	$ 41,500		$ 46,100		$ 34,900		$ 18,400		$ 36,300		$ 26,800		$ 30,100		$ 14,200		$ 140,950		$ 107,426		$ 106,001
Basic earnings (loss) per share:
Continuing operations	$ 0.55		$ 0.65		$ 0.46		$ 0.25		$ 0.50		$ 0.47		$ 0.39		$ 0.15		$ 1.92		$ 1.49		$ 1.19
Discontinued operations	$ (0.02)		$ (0.05)		$ (0.01)		$ (0.01)		$ (0.02)		$ (0.12)		$ (0.01)		$ 0.03		$ (0.09)		$ (0.12)		$ 0.10
Total basic earnings per share	$ 0.54	[1]	$ 0.60	[1]	$ 0.46	[1]	$ 0.24	[1]	$ 0.48	[1]	$ 0.35	[1]	$ 0.37	[1]	$ 0.18	[1]	$ 1.83	[1]	$ 1.37	[1]	$ 1.29	[1]
Diluted earnings (loss) per share:
Continuing operations	$ 0.50		$ 0.59		$ 0.42		$ 0.23		$ 0.46		$ 0.45		$ 0.38		$ 0.14		$ 1.74		$ 1.42		$ 1.13
Discontinued operations	$ (0.02)		$ (0.04)		$ (0.01)		$ (0.01)		$ (0.02)		$ (0.12)		$ (0.01)		$ 0.03		$ (0.08)		$ (0.11)		$ 0.10
Total diluted earnings per share	$ 0.49	[1]	$ 0.54	[1]	$ 0.41	[1]	$ 0.22	[1]	$ 0.45	[1]	$ 0.34	[1]	$ 0.37	[1]	$ 0.17	[1]	$ 1.66	[1]	$ 1.31	[1]	$ 1.23	[1]

[1] Earnings per share calculations may contain slight summation differences due to rounding.