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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | $ 90,446 |  | $ 132,934 |
Liabilities measured at fair value | 53,354 |  | 74,647 |
Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 27,950 |  | 27,947 |
Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 50,912 |  | 94,639 |
Liabilities measured at fair value | 53,354 |  | 72,252 |
Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 11,584 |  | 10,348 |
Interest rate swap |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Liabilities measured at fair value |  |  | 2,395 |
Fair Value Measurements Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 39,534 |  | 38,295 |
Liabilities measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 1 | Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 27,950 |  | 27,947 |
Fair Value Measurements Level 1 | Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Liabilities measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 1 | Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 11,584 |  | 10,348 |
Fair Value Measurements Level 1 | Interest rate swap |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Liabilities measured at fair value |  |  | 0 |
Fair Value Measurements Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 90,585 |  | 130,220 |
Liabilities measured at fair value | 92,816 |  | 109,716 |
Fair Value Measurements Level 2 | Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 2 | Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 90,585 |  | 130,220 |
Liabilities measured at fair value | 92,816 |  | 107,321 |
Fair Value Measurements Level 2 | Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 2 | Interest rate swap |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Liabilities measured at fair value |  |  | 2,395 |
Fair Value Measurements Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 122 |  | 183 |
Liabilities measured at fair value | 333 |  | 695 |
Fair Value Measurements Level 3 | Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 3 | Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 122 |  | 183 |
Liabilities measured at fair value | 333 |  | 695 |
Fair Value Measurements Level 3 | Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 3 | Interest rate swap |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Liabilities measured at fair value |  |  | 0 |
Netting |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | (39,795) | [1] | (35,764) | [1]
Liabilities measured at fair value | (39,795) | [1] | (35,764) | [1]
Netting | Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 0 | [1] | 0 | [1]
Netting | Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | (39,795) | [1] | (35,764) | [1]
Liabilities measured at fair value | (39,795) | [1] | (35,764) | [1]
Netting | Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets measured at fair value | 0 | [1] | 0 | [1]
Netting | Interest rate swap |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Liabilities measured at fair value |  |  | $ 0 | [1]
[1] | Represents the impact of netting assets and liabilities with counterparties with which the right of offset exists.

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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 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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