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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 | Sep. 30, 2013 | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | $ 65,875 |  | $ 132,934 |
Liabilities measured at fair value | 61,013 |  | 74,647 |
Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 27,952 |  | 27,947 |
Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 23,784 |  | 94,639 |
Liabilities measured at fair value | 61,013 |  | 72,252 |
Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 14,139 |  | 10,348 |
Interest rate swap |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Liabilities measured at fair value |  |  | 2,395 |
Fair Value Measurements Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 42,091 |  | 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 |  |  |  |
Assets measured at fair value | 27,952 |  | 27,947 |
Fair Value Measurements Level 1 | Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
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 |  |  |  |
Assets measured at fair value | 14,139 |  | 10,348 |
Fair Value Measurements Level 1 | Interest rate swap |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Liabilities measured at fair value |  |  | 0 |
Fair Value Measurements Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 58,086 |  | 130,220 |
Liabilities measured at fair value | 95,315 |  | 109,716 |
Fair Value Measurements Level 2 | Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 2 | Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 58,086 |  | 130,220 |
Liabilities measured at fair value | 95,315 |  | 107,321 |
Fair Value Measurements Level 2 | Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 2 | Interest rate swap |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Liabilities measured at fair value |  |  | 2,395 |
Fair Value Measurements Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 |  | 183 |
Liabilities measured at fair value | 0 |  | 695 |
Fair Value Measurements Level 3 | Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 3 | Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 |  | 183 |
Liabilities measured at fair value | 0 |  | 695 |
Fair Value Measurements Level 3 | Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 3 | Interest rate swap |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Liabilities measured at fair value |  |  | 0 |
Netting |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | (34,302) | [1] | (35,764) | [1]
Liabilities measured at fair value | (34,302) | [1] | (35,764) | [1]
Netting | Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 | [1] | 0 | [1]
Netting | Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | (34,302) | [1] | (35,764) | [1]
Liabilities measured at fair value | (34,302) | [1] | (35,764) | [1]
Netting | Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 | [1] | 0 | [1]
Netting | Interest rate swap |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
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 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 of financial and nonfinancial obligations. + 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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