Financial Instruments - Derivative Instruments Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets		$ 10,146
Total Fair Value, Derivative Liabilities	1,941
Foreign currency contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	25,923	9,476
Total Fair Value, Derivative Liabilities	1,143	8,933
Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets		670
Total Fair Value, Derivative Liabilities	798
Fair Value of Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets		1,250
Total Fair Value, Derivative Liabilities	834
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Foreign currency contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	12,822	580
Total Fair Value, Derivative Liabilities	36	6,024
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets		670
Total Fair Value, Derivative Liabilities	798
Fair Value of Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets		8,896
Total Fair Value, Derivative Liabilities	1,107
Fair Value of Derivatives Not Designated as Hedging Instruments [Member] | Foreign currency contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	13,101	8,896
Total Fair Value, Derivative Liabilities	1,107	2,909
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