Condensed Unaudited Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$ 46,200	$ 26,817	$ 99,621	$ 71,076
Activity, net of tax (See Note 14)			(4,397)	2,643
Comprehensive income	49,044	29,381	95,224	73,719
Comprehensive income (loss) attributable to non-controlling interests	62	(4)	172	(9)
Comprehensive income attributable to MasTec, Inc.	48,982	29,385	95,052	73,728
Accumulated Translation Adjustment [Member]
Activity, net of tax (See Note 14)	2,936	2,176	(3,839)	2,304
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Activity, net of tax (See Note 14)	$ (92)	$ 388	$ (558)	$ 339