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Derivatives Hedges and Financial Instruments- Net Gains (Losses) Included in Operating Results and Statement of Operations Classifications (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) included in operating results | $ 1,608 | $ 341 | $ (306)
Cost of Sales [Member] | Commodities Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) included in operating results |  |  | 140
Cost of Sales [Member] | Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) included in operating results |  |  | 5
Other Income, net [Member] | Other [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) included in operating results | 361 | 444 | 532
Non-operating Other Expense [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Non-operating other income (expense) - embedded derivative | $ 1,247 | $ (103) | $ (983)

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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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- 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -URI http://asc.fasb.org/subtopic&trid=2229187 + Details
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