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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 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Assets-Supplies, prepaid items and other: |  |
Total | $ 312 | $ 170
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Total | 2,101 | 1,965
Commodities contracts [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Derivative Assets |  | 79
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 83 |
Carbon credits [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Carbon credits | 312 | 91
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Contractual obligations-carbon credits | 312 | 91
Interest rate contracts [Member] |  |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 1,706 | 1,874
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 | 83 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commodities contracts [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Derivative Assets |  |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 83 |
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 |  |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Total | 1,706 |
Significant Other Observable Inputs (Level 2) [Member] | Commodities contracts [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Derivative Assets |  |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities |  |
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 | 1,706 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Total | 312 |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Total | 312 |
Significant Unobservable Inputs (Level 3) [Member] | Commodities contracts [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Derivative Assets |  |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities |  |
Significant Unobservable Inputs (Level 3) [Member] | Carbon credits [Member] |  |
Assets-Supplies, prepaid items and other: |  |
Carbon credits | 312 |
Liabilities-Current and noncurrent accrued and other liabilities: |  |
Contractual obligations-carbon credits | 312 |
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 liabilities, which do not meet the criteria of a derivative instrument. + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + 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=7578670&loc=d3e19207-110258 + Details
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- Definition Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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 6: 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=7491637&loc=d3e13495-108611 + Details
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- Definition Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 15 -Paragraph 83 -URI http://asc.fasb.org/extlink&oid=6913464&loc=d3e34841-113949 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 10 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + 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=7578670&loc=d3e19207-110258 + Details
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