Earnings Per Share (Schedule of Earnings Per Share Information) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net income attributable to MasTec:
Net income - basic (in dollars)	[1]	$ 119,710	$ 80,492	$ 162,823	$ 107,052
Net income - diluted (in dollars)	[1]	$ 119,710	$ 80,492	$ 162,823	$ 107,052
Weighted average shares outstanding:
Weighted average shares outstanding - basic		75,183	78,984	75,088	80,061
Dilutive common stock equivalents (in shares)		564	1,078	573	1,075
Weighted average shares outstanding - diluted		75,747	80,062	75,661	81,136

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