Earnings Per Share (Schedule of Earnings Per Share Information) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income attributable to MasTec:
Net income - basic (in dollars)	[1]	$ 81,668	$ 24,088	$ 122,638	$ 21,395
Net income - diluted (in dollars)	[1]	$ 81,668	$ 24,088	$ 122,638	$ 21,395
Weighted average shares outstanding:
Weighted average shares outstanding - basic		80,925	80,351	80,812	80,253
Dilutive common stock equivalents (in shares)		1,367	915	1,414	790
Weighted average shares outstanding - diluted		82,292	81,266	82,226	81,043
Common Stock [Member]
Weighted average shares outstanding:
Weighted average anti-dilutive common stock equivalents (in shares)	[2]	13	0	6	3

[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.