Condensed Unaudited Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income	$ 31,914	$ 35,047	$ 47,982	$ 53,420
Other comprehensive income (loss):
Activity, net of tax (See Note 13)	7,678	(6,639)	2,343	(7,241)
Comprehensive income	39,592	28,408	50,325	46,179
Comprehensive (loss) income attributable to non-controlling interests	(136)	106	(91)	109
Comprehensive income attributable to MasTec, Inc.	39,728	28,302	50,416	46,070
Foreign Currency [Member]
Other comprehensive income (loss):
Activity, net of tax (See Note 13)	7,678	(5,952)	2,343	(6,775)
Available-for-Sale-Securities [Member]
Other comprehensive income (loss):
Activity, net of tax (See Note 13)	$ 0	$ (687)	$ 0	$ (466)