Condensed Unaudited Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income	$ 45,410	$ 46,200	$ 93,392	$ 99,621
Other comprehensive (loss) income:
Other comprehensive (loss) income (See Note 13)	(12,944)	2,844	(10,601)	(4,397)
Comprehensive income	32,466	49,044	82,791	95,224
Comprehensive income attributable to non-controlling interests	139	62	48	172
Comprehensive income attributable to MasTec, Inc.	32,327	48,982	82,743	95,052
Foreign Currency Translation Adjustments [Member]
Other comprehensive (loss) income:
Other comprehensive (loss) income (See Note 13)	(12,944)	2,936	(10,601)	(3,839)
Available-for-Sale-Securities [Member]
Other comprehensive (loss) income:
Other comprehensive (loss) income (See Note 13)	$ 0	$ (92)	$ 0	$ (558)