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Derivatives, Hedges, Financial Instruments and Carbon Credits - Net Gains (Losses) Included in Earnings and Income Statement Classifications (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gain (losses) included in earnings | $ (277) | $ (373) | $ (2,251)
Cost of sales [Member] | Commodities contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gain (losses) included in earnings | (244) | 14 | (523)
Cost of sales [Member] | Foreign exchange contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gain (losses) included in earnings |  | (19) | 46
Other income [Member] | Carbon credits [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gain (losses) included in earnings | 1,233 | 876 | 1,995
Other expense [Member] | Contractual obligations relating to carbon credits [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gain (losses) included in earnings | (1,233) | (721) | (1,844)
Interest expense [Member] | Interest rate contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gain (losses) included in earnings | $ (33) | $ (523) | $ (1,925)

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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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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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