Components of Equity and Comprehensive Income (Parenthetical) (Detail) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Disclosure Components of Equity and Comprehensive Income [Abstract]
Foreign currency translation adjustments, tax	$ 13,476	$ 11,984	$ 5,621	$ 2,303
Reclassification adjustments for foreign currency realized losses, tax	$ (391)	$ 0	$ (391)	$ 0