Earnings Per Share (Schedule of Earnings Per Share Information) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Net income attributable to MasTec:
Net income - basic (in dollars)	[1]	$ 26,560	$ 40,970
Net income - diluted (in dollars)	[1]	$ 26,560	$ 40,970
Weighted average shares outstanding:
Weighted average shares outstanding - basic		81,150	80,697
Dilutive common stock equivalents (in shares)		1,071	1,460
Weighted average shares outstanding - diluted		82,221	82,157
Common Stock [Member]
Additional information:
Weighted average anti-dilutive common stock equivalents (in shares)	[2]	0	19

[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.