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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, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Assets-Supplies, prepaid items and other: |  |
Total | $ 1,797 | $ 1,315
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Total | 2,649 | 2,524
Commodities contracts [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Derivative Assets | 124 | 31
Carbon credits [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Carbon credits | 1,673 | 1,284
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Contractual obligations-carbon credits | 1,673 | 1,284
Interest rate contracts [Member] |  |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 976 | 1,240
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Total |  |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Total |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commodities contracts [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Derivative Assets |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Carbon credits [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Carbon credits |  |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Contractual obligations-carbon credits |  |
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 |  |
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Total | 124 |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Total | 976 |
Significant Other Observable Inputs (Level 2) [Member] | Commodities contracts [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Derivative Assets | 124 |
Significant Other Observable Inputs (Level 2) [Member] | Carbon credits [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Carbon credits |  |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Contractual obligations-carbon credits |  |
Significant Other Observable Inputs (Level 2) [Member] | Interest rate contracts [Member] |  |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 976 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Total | 1,673 |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Total | 1,673 |
Significant Unobservable Inputs (Level 3) [Member] | Commodities contracts [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Derivative Assets |  |
Significant Unobservable Inputs (Level 3) [Member] | Carbon credits [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Carbon credits | 1,673 |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Contractual obligations-carbon credits | 1,673 |
Significant Unobservable Inputs (Level 3) [Member] | Interest rate contracts [Member] |  |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities |  |

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- Definition Fair value as of the balance sheet date of carbon credit assets, which do not meet the criteria of a derivative instrument. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of carbon credit liabilities, which do not meet the criteria of a derivative instrument. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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