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Derivatives, Hedges, Financial Instruments and Carbon Credits - Realized and Unrealized Net Gains (Losses) Included in Operating Results and Classifications Within Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Total net gains (losses) included in operating results:
Derivative instruments and carbon credits, gains and losses recognized in earnings	$ (161)	$ 46
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	6	412
Cost of sales [Member] | Commodities contracts [Member]
Total net gains (losses) included in operating results:
Derivative instruments and carbon credits, gains and losses recognized in earnings	(162)	142
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	(162)	142
Other income [Member] | Carbon credits [Member]
Total net gains (losses) included in operating results:
Derivative instruments and carbon credits, gains and losses recognized in earnings	233
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	221
Other expenses [Member] | Contractual obligations relating to carbon credits [Member]
Total net gains (losses) included in operating results:
Derivative instruments and carbon credits, gains and losses recognized in earnings	(233)
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	(221)
Interest expense [Member] | Interest rate contracts [Member]
Total net gains (losses) included in operating results:
Derivative instruments and carbon credits, gains and losses recognized in earnings	1	(96)
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	$ 168	$ 270

X

- 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.

+ Details

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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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