Earnings Per Share (Schedule of Earnings Per Share Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net income attributable to MasTec:
Net income - basic (in dollars)	$ 65,649	$ 36,230
Net income - diluted (in dollars)	$ 65,649	$ 36,230
Weighted average shares outstanding:
Weighted average shares outstanding - basic	72,439,000	74,738,000
Dilutive common stock equivalents (in shares)	1,407,000	675,000
Weighted average shares outstanding - diluted	73,846,000	75,413,000
Anti-dilutive common stock (in shares)	22,527