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Derivatives, Hedges, Financial Instruments and Carbon Credits - Net Gains (Losses) Included in Operating Results and Classification Within Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Total net gains (losses) included in operating results: |  |
Total net gain (losses) included in operating results | $ 2,487 | $ (161)
Cost of sales [Member] | Undesignated Commodities Contracts [Member] |  |
Total net gains (losses) included in operating results: |  |
Total net gain (losses) included in operating results | 2,216 | (162)
Other income [Member] | Carbon credits [Member] |  |
Total net gains (losses) included in operating results: |  |
Total net gain (losses) included in operating results | 1,925 | 233
Other expense [Member] | Contractual obligations relating to carbon credits [Member] |  |
Total net gains (losses) included in operating results: |  |
Total net gain (losses) included in operating results | (1,634) | (233)
Interest expense [Member] | Undesignated Interest Rate Contracts [Member] |  |
Total net gains (losses) included in operating results: |  |
Total net gain (losses) included in operating results | $ (20) | $ 1

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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. + Details
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Period Type: | duration

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- Details
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Period Type: | duration