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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 | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total net gain (losses) included in earnings | $ (55) | $ (142) | $ (2,157) | $ 2,345
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 | (70) | (105) | (2,048) | 2,111
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 | 29 |  | (64) |
Other Income [Member] | Carbon Credits [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total net gain (losses) included in earnings | 1,771 |  | 1,741 | 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 | (1,771) |  | (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 | $ (14) | $ (37) | $ (45) | $ (57)

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