Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Revenue	$ 932,300		$ 1,067,300		$ 988,900		$ 738,300		$ 731,600		$ 816,200		$ 709,900		$ 573,600		$ 3,726,789		$ 2,831,292		$ 2,143,024
Costs of revenue, excluding depreciation and amortization																	3,239,195		2,459,746		1,829,498
Depreciation and amortization																	92,601		75,228		57,966
General and administrative expenses																	157,524		132,594		112,180
Interest expense, net																	37,376		34,466		29,178
Gain on remeasurement of equity interest in acquiree																	0		(29,041)		0
Other expense, net																	8,017		96		1,219
Income from continuing operations before provision for income taxes																	192,719		159,280		114,072
Provision for income taxes																	(76,080)		(61,824)		(47,942)
Income from continuing operations before non-controlling interests	37,600		36,100		31,200		11,700		7,000		30,800		43,400		16,300		116,639		97,456		66,130
Discontinued operations (See Note 4 - Discontinued Operations):
(Loss) income from discontinued operations, net of tax, including estimated losses on disposal and impairment charges of $8.7 million, net of tax, for the year ended December 31, 2012	(1,300)		(9,300)		(1,100)		2,500		1,600		1,000		1,100		4,800		(9,223)		8,516		24,257
Net income																	107,416		105,972		90,387
Net loss attributable to non-controlling interests																	(10)		(29)		(141)
Net income attributable to MasTec, Inc.	36,300		26,800		30,100		14,200		8,600		31,800		44,500		21,100		107,426		106,001		90,528
Basic earnings (loss) per share:
Continuing operations, basic earnings per share	$ 0.50	[1]	$ 0.47	[1]	$ 0.39	[1]	$ 0.15	[1]	$ 0.08	[1]	$ 0.36	[1]	$ 0.52	[1]	$ 0.21	[1]	$ 1.49		$ 1.19		$ 0.87
Discontinued operations, basic earnings per share	$ (0.02)	[1]	$ (0.12)	[1]	$ (0.01)	[1]	$ 0.03	[1]	$ 0.02	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.06	[1]	$ (0.12)		$ 0.10		$ 0.32
Total basic earnings per share	$ 0.48	[1]	$ 0.35	[1]	$ 0.37	[1]	$ 0.18	[1]	$ 0.10	[1]	$ 0.37	[1]	$ 0.53	[1]	$ 0.27	[1]	$ 1.37	[2]	$ 1.29	[2]	$ 1.19	[2]
Basic weighted average common shares outstanding																	78,275		82,182		76,132
Diluted earnings (loss) per share:
Continuing operations, diluted earnings per share	$ 0.46	[1]	$ 0.45	[1]	$ 0.38	[1]	$ 0.14	[1]	$ 0.08	[1]	$ 0.35	[1]	$ 0.50	[1]	$ 0.20	[1]	$ 1.42		$ 1.13		$ 0.78
Discontinued operations, diluted earnings per share	$ (0.02)	[1]	$ (0.12)	[1]	$ (0.01)	[1]	$ 0.03	[1]	$ 0.02	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.06	[1]	$ (0.11)		$ 0.10		$ 0.27
Total diluted earnings per share	$ 0.45	[1]	$ 0.34	[1]	$ 0.37	[1]	$ 0.17	[1]	$ 0.10	[1]	$ 0.36	[1]	$ 0.51	[1]	$ 0.26	[1]	$ 1.31	[2]	$ 1.23	[2]	$ 1.05	[2]
Diluted weighted average common shares outstanding																	82,087		86,716		90,885
Segment, Continuing Operations [Member]
Revenue																	3,726,800		2,831,300		2,143,000
Depreciation and amortization																	91,958		74,151		56,877
Interest expense, net																	$ 37,376		$ 34,466		$ 29,178

[1] Note that due to rounding differences, the sum of the Company’s quarterly earnings per share in a given year may not be the same as the Company’s year to date earnings per share for the same period. In addition, earnings per share calculations may contain slight summation differences due to rounding. See Note 2 – Earnings per Share.

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