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Fair Value of Financial Instruments - Foreign Currency Exchange Contracts Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Measurements, Recurring | Foreign Exchange Contract    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency forward contracts—asset position $ 1,119 $ 179
Foreign currency forward contracts—liability position (4,684) (239)
Foreign currency forward contracts, net (3,565) (60)
Fair Value, Measurements, Recurring | Level 2 | Foreign Exchange Contract    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency forward contracts—asset position 1,119 179
Foreign currency forward contracts—liability position (4,684) (239)
Foreign currency forward contracts, net (3,565) (60)
Secured Debt | Equipment Note    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt $ 11,277 $ 11,815