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Fair Value of Financial Instruments - Foreign Currency Exchange Contracts Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - Foreign Exchange Contract - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency forward contracts—asset position $ 460 $ 3,524
Foreign currency forward contracts—liability position (1,403) (85)
Foreign currency forward contracts, net (943) 3,439
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency forward contracts—asset position 460 3,524
Foreign currency forward contracts—liability position (1,403) (85)
Foreign currency forward contracts, net $ (943) $ 3,439