Fair Value of Derivative Instruments Not Designated as Hedging Instruments (Detail) (Nondesignated, USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Foreign exchange derivative contract | Accounts Receivable
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 3,612
Foreign exchange derivative contract | Accounts Payable
Derivatives, Fair Value [Line Items]
Liability Derivatives		(8,459)
Commodity derivative contracts | Accounts Receivable
Derivatives, Fair Value [Line Items]
Asset Derivatives	9,496	197
Commodity derivative contracts | Accounts Payable
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ (3,176)	$ (489)