Net (Gains) Losses Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail) - Derivatives designated as cash flow hedging instruments - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), Effective portion, Net, Total	$ (138)	$ (279)	$ 137	$ (219)
Gain (loss) reclassified from accumulated OCI into income, Effective portion, Net, Total	(59)	59	(58)	35
Foreign exchange option contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), Effective portion, Net, Total	(151)	(226)	61	(198)
Gain (loss) reclassified from accumulated OCI into income, Effective portion, Net, Total	(64)	26	(5)	15
Foreign exchange forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), Effective portion, Net, Total	13	(53)	76	(21)
Gain (loss) reclassified from accumulated OCI into income, Effective portion, Net, Total	$ 5	$ 33	$ (53)	$ 20