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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 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets - Supplies, prepaid items and other: |  |
Total | $ 4,059 | $ 2,779
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 5,541 | 5,934
Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Commodities contracts | 10 | 0
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 1,070 | 2,440
Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 4,049 | 2,779
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | 4,049 | 2,779
Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 416 | 671
Foreign Exchange Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 6 | $ 44
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 0 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 290 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Commodities contracts | 0 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 290 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 0 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Exchange Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 0 |
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 10 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 1,202 |
Significant Other Observable Inputs (Level 2) [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Commodities contracts | 10 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 780 |
Significant Other Observable Inputs (Level 2) [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 0 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 416 |
Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 6 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 4,049 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 4,049 |
Significant Unobservable Inputs (Level 3) [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Commodities contracts | 0 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 4,049 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | 4,049 |
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Foreign Exchange Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | $ 0 |

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