Earnings Per Share (Schedule of Earnings Per Share Information) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income attributable to MasTec:
Net income - basic (in dollars)	[1]	$ 63,752	$ 56,277	$ 186,390	$ 77,672
Net income - diluted (in dollars)	[1]	$ 63,752	$ 56,277	$ 186,390	$ 77,672
Weighted average shares outstanding:
Weighted average shares outstanding - basic		80,953	80,462	80,859	80,323
Dilutive common stock equivalents (in shares)		1,433	1,083	1,422	918
Weighted average shares outstanding - diluted		82,386	81,545	82,281	81,241
Common Stock [Member]
Weighted average shares outstanding:
Weighted average anti-dilutive common stock equivalents (in shares)	[2]	0	1	12	0

[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.