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Derivatives, Hedges, Financial Instruments and Carbon Credits - Net Gains (Losses) Included in Earnings and the Income Statement Classifications (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total net gain (losses) included in earnings | $ (630) | $ (200) | $ (2,787) | $ 2,145
Cost of Sales [Member] | Commodities Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total net gain (losses) included in earnings | (1,526) | (214) | (3,574) | 1,897
Cost of Sales [Member] | Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total net gain (losses) included in earnings | 2 |  | (62) |
Other Income [Member] | Carbon Credits [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total net gain (losses) included in earnings | 904 |  | 2,645 | 1,925
Other Expense [Member] | Contractual Obligations Relating to Carbon Credits [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total net gain (losses) included in earnings |  |  | (1,741) | (1,634)
Interest Expense [Member] | Interest Rate Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total net gain (losses) included in earnings | $ (10) | $ 14 | $ (55) | $ (43)

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