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Derivatives, Hedges, Financial Instruments and Carbon Credits - Realized and Unrealized Net Gains (Losses) Included in Earnings and Income Statement Classifications (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Total net gains (losses) included in earnings:
Derivative instruments and carbon credits, gains and losses recognized in earnings	$ (25)	$ (455)	$ (186)	$ (409)
Change in unrealized gains (losses) relating to contracts still held at period end:
Derivative instruments and carbon credits, change in unrealized gains and losses recognized in earnings	257	(255)	425	16
Cost of sales [Member] | Commodities contracts [Member]
Total net gains (losses) included in earnings:
Derivative instruments and carbon credits, gains and losses recognized in earnings	(113)	(214)	(275)	(72)
Change in unrealized gains (losses) relating to contracts still held at period end:
Derivative instruments and carbon credits, change in unrealized gains and losses recognized in earnings		(209)		(208)
Cost of sales [Member] | Foreign exchange contracts [Member]
Total net gains (losses) included in earnings:
Derivative instruments and carbon credits, gains and losses recognized in earnings		(8)		(8)
Change in unrealized gains (losses) relating to contracts still held at period end:
Derivative instruments and carbon credits, change in unrealized gains and losses recognized in earnings		(2)		(2)
Other income [Member] | Carbon credits [Member]
Total net gains (losses) included in earnings:
Derivative instruments and carbon credits, gains and losses recognized in earnings	313		546
Change in unrealized gains (losses) relating to contracts still held at period end:
Derivative instruments and carbon credits, change in unrealized gains and losses recognized in earnings	313		534
Other expense [Member] | Contractual obligations relating to carbon credits [Member]
Total net gains (losses) included in earnings:
Derivative instruments and carbon credits, gains and losses recognized in earnings	(313)		(546)
Change in unrealized gains (losses) relating to contracts still held at period end:
Derivative instruments and carbon credits, change in unrealized gains and losses recognized in earnings	(313)		(534)
Interest expense [Member] | Interest rate contracts [Member]
Total net gains (losses) included in earnings:
Derivative instruments and carbon credits, gains and losses recognized in earnings	88	(233)	89	(329)
Change in unrealized gains (losses) relating to contracts still held at period end:
Derivative instruments and carbon credits, change in unrealized gains and losses recognized in earnings	$ 257	$ (44)	$ 425	$ 226

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- Definition

The amount of net gains and losses (realized and unrealized) recognized in earnings during the period on derivative instruments and carbon credit assets or carbon credit contractual obligations measured at fair value.

+ References

No definition available.

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- Definition

Derivative instruments and carbon credits change in unrealized gains and losses relating to contracts still held at period end.

+ References

No definition available.

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