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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, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency forward contracts —asset position	$ 179	$ 3,524
Foreign currency forward contracts —liability position	(239)	(85)
Total foreign currency derivative instruments	(60)	3,439
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency forward contracts —asset position	179	3,524
Foreign currency forward contracts —liability position	(239)	(85)
Total foreign currency derivative instruments	$ (60)	$ 3,439

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+ References

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