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Impact of Derivative Instruments Not Designated as Fair Value Hedges (Detail) (Commodity Forward Contracts, Derivatives Not Designated As Hedging Instruments, Cost of Sales, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Commodity Forward Contracts \| Derivatives Not Designated As Hedging Instruments \| Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ (1,592)	$ 483	$ (1,031)	$ 467

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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