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Summarized Financial Information Concerning Segments (Parenthetical) (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Segment Reporting Information |  |  |  |
Loss (gain) due to change in fair value of derivative contracts |  |  | $ 56,085,000 | $ (234,705,000)
Permian Properties |  |  |  |
Segment Reporting Information |  |  |  |
Gain (loss) on sale of oil and gas property |  |  | (398,900,000) |
Commodity Derivatives |  |  |  |
Segment Reporting Information |  |  |  |
Loss (gain) due to change in fair value of derivative contracts | 119,605,000 | 222,467,000 | 58,480,000 | (229,073,000)
Exploration and Production | Permian Properties |  |  |  |
Segment Reporting Information |  |  |  |
Gain (loss) on sale of oil and gas property |  |  | (398,900,000) |
Exploration and Production | Commodity Derivatives |  |  |  |
Segment Reporting Information |  |  |  |
Loss (gain) due to change in fair value of derivative contracts | $ 119,605,000 | $ 222,467,000 | $ 58,480,000 | $ (229,073,000)

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- Definition Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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