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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, 2016 | Dec. 31, 2015
--- | --- | ---
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | $ (2,605) | $ (3,308)
Foreign Exchange Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Foreign exchange contracts | 1 |
Foreign Exchange Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Foreign exchange contracts | 1 |
Recurring [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 3 | 1,349
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | (2,605) | (3,308)
Total | (2,607) | (4,796)
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 3 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | (2) |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | (2,605) |
Total | (2,605) |
Recurring [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Commodities contracts | 2 | 195
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | (2) | (202)
Recurring [Member] | Commodities Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Commodities contracts | 2 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | $ (2) |
Recurring [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits |  | 1,154
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits |  | (1,154)
Recurring [Member] | Foreign Exchange Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities |  | (6)
Recurring [Member] | Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities |  | $ (126)

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