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Fair Value of Derivative Instruments Not Designated as Hedging Instruments (Detail) (Nondesignated, USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Commodity Derivative Contracts \| Accounts Receivable
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 197	$ 750
Commodity Derivative Contracts \| Accounts Payable
Derivatives, Fair Value [Line Items]
Liability Derivatives	489	626
Foreign Exchange Derivative Contracts \| Accounts Receivable
Derivatives, Fair Value [Line Items]
Asset Derivatives		7,261
Foreign Exchange Derivative Contracts \| Accounts Payable
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 8,459

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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