Earnings Per Share (Schedule Of Earnings Per Share, Basic and Diluted) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Diluted Net Income Attributable to MasTec
Basic net income from continuing operations	$ 49,960	[1]	$ 36,098	[1]	$ 104,702	[1]	$ 78,957	[1]
Net loss from discontinued operations	(3,822)	[1]	(9,277)	[1]	(5,252)	[1]	(7,872)	[1]
Diluted net income attributable to MasTec	46,217		26,899		99,685		71,319
Weighted Average Number of Shares Outstanding, Diluted
Basic weighted average shares outstanding	77,093		76,194		76,816		79,009
Dilutive common stock equivalents	775		887		774		842
Diluted weighted average shares outstanding	85,464		79,526		84,733		81,982
Continuing Operations [Member]
Diluted Net Income Attributable to MasTec
Diluted net income attributable to MasTec	50,039		36,176		104,937		79,191
Unsecured Debt [Member] | Convertible Debt [Member] | 2009 Senior Convertible Notes [Member]
Diluted Net Income Attributable to MasTec
Interest expense, net of tax, 2009 Convertible Notes	$ 79		$ 78		$ 235		$ 234
Weighted Average Number of Shares Outstanding, Diluted
Dilutive shares, 2009 Convertible Notes	806		806		806		806
Unsecured Debt [Member] | Convertible Debt [Member] | 2011 Senior Convertible Notes [Member]
Weighted Average Number of Shares Outstanding, Diluted
Dilutive premium shares, 2011 Convertible Notes	6,790		1,639		6,337		1,325

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