Financial Instruments - Derivative Instruments Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	$ 52,341	$ 21,718
Total Fair Value, Derivative Liabilities	10,555
Foreign currency contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	49,665	21,035
Total Fair Value, Derivative Liabilities	10,555	1,061
Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	2,676	683
Fair Value of Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	34,648	17,320
Total Fair Value, Derivative Liabilities	1,193
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Foreign currency contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	31,972	16,637
Total Fair Value, Derivative Liabilities	1,193	6
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	2,676	683
Fair Value of Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	17,693	4,398
Total Fair Value, Derivative Liabilities	9,362
Fair Value of Derivatives Not Designated as Hedging Instruments [Member] | Foreign currency contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	17,693	4,398
Total Fair Value, Derivative Liabilities	9,362	1,055
Fair Value of Derivatives Not Designated as Hedging Instruments [Member] | Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	$ 0	$ 0