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Financial Instruments - Derivative Instruments Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets $ 14,353 $ 7,229
Foreign currency contracts    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 2,133 6,142
Total Fair Value, Derivative Liabilities 6,342 6,907
Currency Swap [Member]    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 12,220 1,087
Fair Value of Derivatives Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 13,965 5,209
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Foreign currency contracts    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 1,745 4,122
Total Fair Value, Derivative Liabilities 506 205
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Currency Swap [Member]    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 12,220 1,087
Fair Value of Derivatives Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 388 2,020
Fair Value of Derivatives Not Designated as Hedging Instruments [Member] | Foreign currency contracts    
Derivatives, Fair Value [Line Items]    
Total Fair Value, Derivative Assets 388 2,020
Total Fair Value, Derivative Liabilities 5,836 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