Earnings Per Share (Schedule Of Earnings Per Share )(Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Net income attributable to MasTec:
Net income, continuing operations - basic	$ 147,492	[1]	$ 116,639	[1]	$ 97,454	[1]
Net (loss) income from discontinued operations - basic and diluted	(6,542)	[1]	(9,213)	[1]	8,547	[1]
Net income attributable to MasTec - diluted	141,265		107,737		106,488
Weighted average shares outstanding:
Weighted average shares outstanding - basic	76,923		78,275		82,182
Dilutive common stock equivalents	777		883		1,127
Weighted average shares outstanding - diluted	84,901		82,082		86,716
Continuing Operations [Member]
Net income attributable to MasTec:
Net income attributable to MasTec - diluted	147,807		116,950		97,941
Unsecured Debt [Member] | Convertible Debt [Member] | 2009 Senior Convertible Notes [Member]
Net income attributable to MasTec:
Interest expense, net of tax, 2009 Convertible Notes	$ 315		$ 311		$ 487
Weighted average shares outstanding:
Dilutive shares, 2009 Convertible Notes	806		806		1,245
Unsecured Debt [Member] | Convertible Debt [Member] | 2011 Senior Convertible Notes [Member]
Weighted average shares outstanding:
Dilutive premium shares, 2011 Convertible Notes	6,395		2,118		2,162

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