Earnings Per Share (Schedule of Earnings Per Share Information) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income attributable to MasTec:
Net income - basic (in dollars)	[1]	$ 80,492	$ 81,668	$ 107,052	$ 122,638
Net income - diluted (in dollars)	[1]	$ 80,492	$ 81,668	$ 107,052	$ 122,638
Weighted average shares outstanding:
Weighted average shares outstanding - basic		78,984	80,925	80,061	80,812
Dilutive common stock equivalents (in shares)		1,078	1,367	1,075	1,414
Weighted average shares outstanding - diluted		80,062	82,292	81,136	82,226
Common Stock [Member]
Additional information:
Weighted average anti-dilutive common stock equivalents (in shares)	[2]	0	13	0	6

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

[2] Represents anti-dilutive common stock equivalents as calculated under the treasury stock method.