Condensed Unaudited Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ 18,373	$ 14,170
Foreign currency translation (losses) gains	(824)	1,123
Unrealized gains on available for sale securities:
Unrealized gains on available for sale securities, before tax	359	416
Less: provision for income taxes	(138)	(170)
Unrealized gains on available for sale securities, net of tax	221	246
Comprehensive income	17,770	15,539
Comprehensive income (loss) attributable to non-controlling interests	3	(2)
Comprehensive income attributable to MasTec, Inc.	$ 17,767	$ 15,541

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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