Derivatives Designated as Hedging Instruments by Classification and Amount of Gains and Losses (Detail) (Designated As Hedging Instrument, Foreign Exchange Forward, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Designated As Hedging Instrument | Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in OCI	$ 19,745	$ (10,614)	$ 15,437	$ (3,348)
Amount of gain (loss) reclassified from accumulated OCI to statements of operations	$ (3,328)	$ (321)	$ (8,925)	$ 482