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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, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives $ 269 $ 1,249
Derivative instruments, liabilities derivatives 118 7
Derivatives Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives 269 923
Derivative instruments, liabilities derivatives 91 3
Derivatives not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative instruments, assets derivatives   326
Derivative instruments, liabilities derivatives $ 27 $ 4