Earnings Per Share (Schedule of Earnings Per Share Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net income attributable to MasTec:
Net income - basic (in dollars)	$ 57,005	$ 119,710	$ 93,235	$ 162,823
Net income - diluted (in dollars)	$ 57,005	$ 119,710	$ 93,235	$ 162,823
Weighted average shares outstanding:
Weighted average shares outstanding - basic	72,045,000	75,183,000	73,392,000	75,088,000
Dilutive common stock equivalents (in shares)	732,000	564,000	743,000	573,000
Weighted average shares outstanding - diluted	72,777,000	75,747,000	74,135,000	75,661,000
Anti-dilutive common stock (in shares)			88,462