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Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Forward exchange contracts, assets $ 2,185 $ 1,966
Forward exchange contracts, liabilities (307)  
Total net derivative asset designated as hedging instruments 1,878 1,966
Derivatives Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Forward exchange contracts, assets 2,185 1,966
Forward exchange contracts, liabilities (307)  
Total net derivative asset designated as hedging instruments $ 1,878 $ 1,966