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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 98,409	$ 100,856	$ 249,992	$ 220,647
Other comprehensive income (loss), net of tax provision:
Foreign currency translation adjustment, net of tax of $0, $0, $0 and $0	13,120	22,289	(25,772)	19,047
Other, net of tax of $0, $1, $0 and $3		4		14
Other comprehensive income (loss)	13,120	22,293	(25,772)	19,061
Comprehensive income	111,529	123,149	224,220	239,708
Less: Comprehensive income attributable to noncontrolling interests	5,503	4,458	14,768	13,004
Total comprehensive income attributable to Quanta shareholders	$ 106,026	$ 118,691	$ 209,452	$ 226,704

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