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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 Currency Forward Contracts - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency forward contracts —asset position $ 4,539 $ 179
Foreign currency forward contracts —liability position (236) (239)
Total foreign currency derivative instruments 4,303 (60)
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency forward contracts —asset position 4,539 179
Foreign currency forward contracts —liability position (236) (239)
Total foreign currency derivative instruments $ 4,303 $ (60)