Earnings Per Share (Schedule of Earnings Per Share Information) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2015	Mar. 31, 2014
Net (loss) income attributable to MasTec:
Net (loss) income, continuing operations - basic (in dollars)	[1]	$ (6,263)	$ 12,219
Interest expense, net of tax, convertible notes (in dollars)		0	78
Net (loss) income attributable to MasTec - diluted (in dollars)		(6,263)	12,175
Net loss from discontinued operations - basic and diluted (in dollars)	[1]	$ 0	$ (122)
Weighted average shares outstanding:
Weighted average shares outstanding - basic		82,397	77,345
Dilutive common stock equivalents (in shares)		0	850
Weighted average shares outstanding - diluted		82,397	86,622
Convertible Debt [Member]
Weighted average shares outstanding:
Dilutive shares, convertible notes		0	8,427
Continuing Operations [Member]
Net (loss) income attributable to MasTec:
Net (loss) income attributable to MasTec - diluted (in dollars)		$ (6,263)	$ 12,297

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