Financial Instruments - Derivative Instruments Measured at Fair Value (Detail) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities	[1]	$ 34,887	$ 13,555
Foreign currency contracts
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	[2]	22,697	5,137
Total Fair Value, Derivative Liabilities	[1]	6,151	12,186
Interest rate swaps
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities		28,736	1,369
Fair Value of Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities	[1]	4,049	9,211
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Foreign currency contracts
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	[2]	5,525	1,159
Total Fair Value, Derivative Liabilities	[1]	250	7,842
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Interest rate swaps
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities		3,799	1,369
Fair Value of Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities	[1]	30,838	4,344
Fair Value of Derivatives Not Designated as Hedging Instruments [Member] | Foreign currency contracts
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	[2]	17,172	3,978
Total Fair Value, Derivative Liabilities	[1]	5,901	$ 4,344
Fair Value of Derivatives Not Designated as Hedging Instruments [Member] | Interest rate swaps
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities	[1]	$ 24,937

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