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Fair Value of Derivative Instruments and Location in the Balance Sheets (Detail) - Foreign Currency Forward Contracts - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives $ 1,405 $ 644
Derivatives Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives 1,137 384
Derivatives not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives $ 268 $ 260