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Derivatives, Hedges, Financial Instruments and Carbon Credits - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Recurring [Member] - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets - Supplies, prepaid items and other: |  |
Total | $ 190 | $ 2,779
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 1,380 | 5,934
Commodities Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 915 | 2,440
Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 187 | 2,779
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | 187 | 2,779
Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 278 | 671
Foreign Exchange Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Foreign exchange contracts | 3 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities |  | $ 44
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 3 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 1,193 |
Significant Other Observable Inputs (Level 2) [Member] | Commodities Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 915 |
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 278 |
Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Foreign exchange contracts | 3 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 187 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 187 |
Significant Unobservable Inputs (Level 3) [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 187 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | $ 187 |

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