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Financial Instruments - Derivative Instruments Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets $ 21,296  
Foreign currency contracts    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 4,927 $ 6,142
Total Fair Value, Derivative Liabilities 3,220 6,907
Currency Swap [Member]    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 16,369 1,087
Fair Value of Derivatives Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 20,295  
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Foreign currency contracts    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 3,926 4,122
Total Fair Value, Derivative Liabilities 90 205
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Currency Swap [Member]    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 16,369 1,087
Fair Value of Derivatives Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 1,001  
Fair Value of Derivatives Not Designated as Hedging Instruments [Member] | Foreign currency contracts    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 1,001 2,020
Total Fair Value, Derivative Liabilities 3,130 6,702
Fair Value of Derivatives Not Designated as Hedging Instruments [Member] | Currency Swap [Member]    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets $ 0 $ 0