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Derivatives, Hedges, Financial Instruments and Carbon Credits - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | $ (2,970) | $ (2,660)
Recurring [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 1,147 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | (2,970) | (2,660)
Total | (4,117) | $ (2,660)
Recurring [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 1,147 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | (1,147) |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 1,147 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | (2,970) |
Total | (4,117) |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 1,147 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | $ (1,147) |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Details
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