Net (Gains) Losses Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail) (Derivatives designated as cash flow hedging instruments, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), Effective portion, Net, Total	$ (430)	$ 283	$ 246
Gain (loss) reclassified from accumulated OCI into income, Effective portion, Net, Total	382	(515)	195
Foreign exchange option contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), Effective portion, Net, Total	(389)	108	177
Gain (loss) reclassified from accumulated OCI into income, Effective portion, Net, Total	337	(266)	124
Foreign exchange forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), Effective portion, Net, Total	(41)	175	69
Gain (loss) reclassified from accumulated OCI into income, Effective portion, Net, Total	$ 45	$ (249)	$ 71