Earnings Per Share (Schedule of Earnings Per Share Information) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income attributable to MasTec:
Net income - basic (in dollars)	[1]	$ 128,596	$ 120,666	$ 291,418	$ 227,718
Net income - diluted (in dollars)	[1]	$ 128,596	$ 120,666	$ 291,418	$ 227,718
Weighted average shares outstanding:
Weighted average shares outstanding - basic		75,217	78,096	75,131	79,399
Dilutive common stock equivalents (in shares)		717	1,105	629	1,085
Weighted average shares outstanding - diluted		75,934	79,201	75,760	80,484

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