Condensed Unaudited Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Income Statement [Abstract]
Revenue	$ 1,067,300		$ 816,226		$ 2,794,431		$ 2,099,674
Costs of revenue, excluding depreciation and amortization	924,304		702,969		2,445,056		1,805,997
Depreciation and amortization	22,645		19,587		65,125		52,769
General and administrative expenses	42,514		35,174		118,192		97,739
Interest expense, net	9,446		8,977		27,883		25,202
Gain on remeasurement of equity interest in acquiree	0		0		0		(29,041)
Other expense, net	8,815		650		7,989		160
Income from continuing operations before provision for income taxes	59,576		48,869		130,186		146,848
Provision for income taxes	(23,478)		(18,042)		(51,229)		(56,374)
Income from continuing operations before non-controlling interests	36,098		30,827		78,957		90,474
Discontinued operations (See Note 4 - Discontinued Operations):
(Loss) income from discontinued operations, net of tax, including impairment charges and loss on disposal of $7.7 million and $8.2 million, net of tax, respectively, for the three and nine month periods ended September 30, 2012	(9,281)		1,003		(7,881)		6,937
Net income	26,817		31,830		71,076		97,411
Net loss attributable to non-controlling interests	(4)		(12)		(9)		(31)
Net income attributable to MasTec, Inc.	$ 26,821		$ 31,842		$ 71,085		$ 97,442
Basic earnings (loss) per share:
Continuing operations, Basic earnings per share	$ 0.47		$ 0.36		$ 1.00		$ 1.10
Discontinued operations, basic earnings per share	$ (0.12)		$ 0.01		$ (0.10)		$ 0.09
Total basic earnings per share	$ 0.35	[1]	$ 0.38	[1]	$ 0.90	[1]	$ 1.19
Basic weighted average common shares outstanding	76,194	[1]	84,732	[1]	79,009	[1]	81,982	[1]
Diluted earnings (loss) per share:
Continuing operations, diluted earnings per share	$ 0.45		$ 0.35		$ 0.97		$ 1.05
Discontinued operations, diluted earnings per share	$ (0.12)		$ 0.01		$ (0.10)		$ 0.08
Total diluted earnings per share	$ 0.34	[1]	$ 0.36	[1]	$ 0.87	[1]	$ 1.13	[1]
Diluted weighted average common shares outstanding	79,526	[1]	89,324	[1]	81,982	[1]	86,933	[1]

[1] Note that earnings per share tables may contain slight summation differences due to rounding.