Financial Instruments - Derivative Instruments Measured at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	$ 7,229
Total Fair Value, Derivative Liabilities		$ 13,555
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities		1,369
Foreign Currency Contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	6,142	5,137
Total Fair Value, Derivative Liabilities	6,907	12,186
Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	1,087
Fair Value of Derivatives Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	5,209
Total Fair Value, Derivative Liabilities		9,211
Fair Value of Derivatives Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities		1,369
Fair Value of Derivatives Designated as Hedging Instrument [Member] | Foreign Currency Contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	4,122	1,159
Total Fair Value, Derivative Liabilities	205	7,842
Fair Value of Derivatives Designated as Hedging Instrument [Member] | Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	1,087
Fair Value of Derivatives Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	2,020
Total Fair Value, Derivative Liabilities		4,344
Fair Value of Derivatives Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities		0
Fair Value of Derivatives Not Designated as Hedging Instrument [Member] | Foreign Currency Contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	2,020	3,978
Total Fair Value, Derivative Liabilities	6,702	$ 4,344
Fair Value of Derivatives Not Designated as Hedging Instrument [Member] | Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	$ 0