Earnings Per Share (Schedule Of Earnings Per Share Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Net income attributable to MasTec:
Net income, continuing operations - basic	$ 32,199	[1]	$ 35,425	[1]	$ 48,345	[1]	$ 54,742	[1]
Net income attributable to MasTec - diluted	32,118		35,020		48,219		53,468
Net loss from discontinued operations - basic and diluted	(149)	[1]	(484)	[1]	(272)	[1]	(1,431)	[1]
Weighted average shares outstanding:
Weighted average shares outstanding - basic	78,269		76,741		77,810		76,675
Dilutive common stock equivalents	750		776		799		781
Weighted average shares outstanding - diluted	86,730		84,558		86,675		84,337
Continuing Operations [Member]
Net income attributable to MasTec:
Net income attributable to MasTec - diluted	32,267		35,504		48,491		54,899
Convertible Debt [Member] | 2009 Convertible Notes [Member]
Net income attributable to MasTec:
Interest expense, net of tax, 2009 Convertible Notes	$ 68		$ 79		$ 146		$ 157
Weighted average shares outstanding:
Dilutive shares, 2009 Convertible Notes	687		806		746		806
Convertible Debt [Member] | 2011 Convertible Notes [Member]
Weighted average shares outstanding:
Dilutive premium shares, 2011 Convertible Notes	7,024		6,235		7,320		6,075

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