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Fair Value of Derivative Instruments and Location in the Balance Sheets (Detail) - Foreign Currency Forward Contracts - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives $ 241 $ 1,249
Derivative instruments, liabilities derivatives 39 7
Derivatives Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives 227 923
Derivative instruments, liabilities derivatives 35 3
Derivatives not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives 14 326
Derivative instruments, liabilities derivatives $ 4 $ 4