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Derivatives, Hedges, Financial Instruments and Carbon Credits - Net Gains (Losses) Included in Operating Results and the Statement of Operations Classifications (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gain (losses) included in operating results | $ (4,028) | $ (1,028) | $ (277)
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 operating results | (4,293) | (1,198) | (244)
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 operating results | (72) | (49) |
Other Income [Member] | Carbon Credits [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gain (losses) included in operating results | 3,663 | 3,089 | 1,233
Other Expense [Member] | Contractual Obligations Relating to Carbon Credits [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gain (losses) included in operating results | (2,759) | (2,799) | (1,233)
Non-operating Other Expense [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Non-operating other expense - embedded derivative | (520) |  |
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 operating results | $ (47) | $ (71) | $ (33)

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- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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