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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 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | $ 3,308 |
Recurring [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 1,349 | $ 2,779
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | 3,308 |
Total | 4,796 | 5,663
Recurring [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Commodities contracts | 195 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 202 | 2,169
Recurring [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 1,154 | 2,779
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | 1,154 | 2,779
Recurring [Member] | Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 126 | 671
Recurring [Member] | Foreign Exchange Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 6 | $ 44
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 195 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | 3,308 |
Total | 3,642 |
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Commodities contracts | 195 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 202 |
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 126 |
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Foreign Exchange Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 6 |
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 1,154 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 1,154 |
Significant Unobservable Inputs (Level 3) [Member] | 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 |

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