Earnings Per Share (Schedule Of Earnings Per Share, Basic and Diluted) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Net Income (Loss) Attributable to MasTec, Basic
Net income from continuing operations	$ 35,425		$ 31,164		$ 54,742		$ 42,859
Net (loss) income from discontinued operations	(484)		(1,072)		(1,431)		1,405
Net income attributable to MasTec, Inc.	34,941		30,092		53,311		44,264
Weighted Average Number of Shares Outstanding, Basic
Basic weighted average shares outstanding	76,741		80,249		76,675		80,432
Earnings (Loss) Per Share, Basic
Basic earnings per share, continuing operations	$ 0.46		$ 0.39		$ 0.71		$ 0.53
Basic (loss) earnings per share, discontinued operations	$ (0.01)		$ (0.01)		$ (0.02)		$ 0.02
Total basic earnings per share	$ 0.46	[1]	$ 0.37	[1]	$ 0.70	[1]	$ 0.55	[1]
Net Income (Loss) Attributable to MasTec, Diluted
Net income from continuing operations	35,425		31,164		54,742		42,859
Diluted net income from continuing operations	35,504		31,242		54,899		43,014
Net (loss) income from discontinued operations	(484)		(1,072)		(1,431)		1,405
Diluted net income attributable to MasTec	35,020		30,170		53,468		44,419
Weighted Average Number of Shares Outstanding, Diluted
Basic weighted average shares outstanding	76,741		80,249		76,675		80,432
Dilutive common stock equivalents	776		799		781		815
Diluted weighted average shares outstanding	84,558		82,466		84,337		83,213
Earnings (Loss) Per Share, Diluted
Diluted earnings per share, continuing operations	$ 0.42		$ 0.38		$ 0.65		$ 0.52
Diluted (loss) earnings per share, discontinued operations	$ (0.01)		$ (0.01)		$ (0.02)		$ 0.02
Total diluted earnings per share	$ 0.41	[1]	$ 0.37	[1]	$ 0.63	[1]	$ 0.53	[1]
Convertible Debt [Member] | Original 4.0% Notes [Member]
Net Income (Loss) Attributable to MasTec, Diluted
Interest expense on convertible debt, net of tax	59		59		118		116
Weighted Average Number of Shares Outstanding, Diluted
Dilutive shares	612		612		612		612
Convertible Debt [Member] | Original 4.25% Notes [Member]
Net Income (Loss) Attributable to MasTec, Diluted
Interest expense on convertible debt, net of tax	$ 20		$ 19		$ 39		$ 39
Weighted Average Number of Shares Outstanding, Diluted
Dilutive shares	194		194		194		194
Convertible Debt [Member] | New 4.0% Notes [Member]
Weighted Average Number of Shares Outstanding, Diluted
Dilutive premium shares	3,187		260		3,104		545
Convertible Debt [Member] | New 4.25% Notes [Member]
Weighted Average Number of Shares Outstanding, Diluted
Dilutive premium shares	3,048		352		2,971		615

[1] Earnings per share tables may contain slight summation differences due to rounding.