Earnings Per Share (Schedule of Earnings Per Share Information) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Net income attributable to MasTec:
Net income - basic (in dollars)	[1]	$ 43,112	$ 26,560
Net income - diluted (in dollars)	[1]	$ 43,112	$ 26,560
Weighted average shares outstanding:
Weighted average shares outstanding - basic		74,991	81,150
Dilutive common stock equivalents (in shares)		587	1,071
Weighted average shares outstanding - diluted		75,578	82,221

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