Effect of Company's Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivatives designated as cash flow hedging instruments under ASC 815 [Member] | Foreign currency forward and option contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ 127	$ (1,993)	$ 4,090	$ (2,933)
Gain (Loss) Reclassified from Accumulated AOCI Into Income (Effective Portion)	1,631	1,378	2,290	2,430
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)			17
Derivatives not designated as hedging instruments under ASC 815 [Member] | Foreign currency forward contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ (849)	$ 3,835	$ (1,046)	$ 103