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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, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives $ 250 $ 241
Derivative instruments, liabilities derivatives 957 39
Derivatives Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives 70 227
Derivative instruments, liabilities derivatives 773 35
Derivatives not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives 180 14
Derivative instruments, liabilities derivatives $ 184 $ 4