Derivative Instruments - Additional Information (Detail) (USD $)	3 Months Ended			3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Mar. 31, 2012 Designated As Hedging Instrument Foreign Exchange Forward Cost of Sales Classification	Mar. 31, 2011 Designated As Hedging Instrument Foreign Exchange Forward Cost of Sales Classification	Mar. 31, 2012 Not Designated As Hedging Instrument	Mar. 31, 2011 Not Designated As Hedging Instrument	Mar. 31, 2012 Not Designated As Hedging Instrument Foreign Exchange Forward Cost of Sales Classification	Mar. 31, 2011 Not Designated As Hedging Instrument Foreign Exchange Forward Cost of Sales Classification
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Maximum term for foreign currency forward exchange contracts	18 months
Notional amount of foreign currency forward exchange contracts	$ 1,390,000,000	$ 1,140,000,000	$ 1,380,000,000
Net gain (loss) reclassified from accumulated OCI to the statements of operations for derivatives designated as hedging instruments				4,538,000	740,000
Net gain (loss) recognized in the statements of operations for derivatives not designated as hedging instruments						$ 20,695,000	$ 30,882,000	$ 247,000	$ 1,700,000