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Fair Value of Derivative Instruments and Location in the Balance Sheets (Detail) - Foreign Currency Forward Contracts - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives   $ 241
Derivative instruments, liabilities derivatives $ 1,223 39
Derivatives Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives   227
Derivative instruments, liabilities derivatives 1,044 35
Derivatives not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives   14
Derivative instruments, liabilities derivatives $ 179 $ 4