Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Forward exchange contracts, assets	$ 1,042	$ 920
Forward exchange contracts, liabilities	(88)	(656)
Total net derivative asset (liability) designated as hedging instruments	954	264
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Forward exchange contracts, assets	1,042	920
Forward exchange contracts, liabilities	(88)	(656)
Total net derivative asset (liability) designated as hedging instruments	$ 954	$ 264