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Selected Quarterly Financial Data (Unaudited) - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
General and administrative | $ 60,207,000 | $ 44,919,000 | $ 101,987,000 | $ 84,058,000 | $ 46,582,000 | $ 44,497,000 | $ 44,005,000 | $ 38,729,000 | $ 291,171,000 | $ 173,813,000 | $ 151,191,000
Gain on the sale of assets | 3,162,000 | 6,008,000 | 83,287,000 | (166,000) | 61,836,000 | 949,000 | (3,227,000) | (10,426,000) | 92,291,000 | 49,132,000 | 2,259,000
State apportionment rate adjustments | 21,200,000 |  |  |  |  |  |  |  | 21,200,000 |  |
Drummond Legal Settlement |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
General and administrative |  |  | 52,500,000 | 35,000,000 |  |  |  |  |  |  |
Deleware and Permian Basin Properties |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on the sale of assets |  |  | $ 79,400,000 |  |  |  |  |  |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from state taxes. + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of oil and gas property or timber property. + 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 aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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