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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from state taxes.

+ References

No definition available.

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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

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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

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Selected Quarterly Financial Data (Unaudited) - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Quarterly Financial Information [Line Items]
Gain on the sale of assets	$ 3,760,000	$ 167,000	$ 282,064,000	$ (353,000)	$ 3,162,000	$ 6,008,000	$ 83,287,000	$ (166,000)	$ 285,638,000	$ 92,291,000	$ 49,132,000
General and administrative	52,363,000us-gaap_GeneralAndAdministrativeExpense	54,963,000us-gaap_GeneralAndAdministrativeExpense	56,888,000us-gaap_GeneralAndAdministrativeExpense	49,212,000us-gaap_GeneralAndAdministrativeExpense	60,207,000us-gaap_GeneralAndAdministrativeExpense	44,919,000us-gaap_GeneralAndAdministrativeExpense	101,987,000us-gaap_GeneralAndAdministrativeExpense	84,058,000us-gaap_GeneralAndAdministrativeExpense	213,426,000us-gaap_GeneralAndAdministrativeExpense	291,171,000us-gaap_GeneralAndAdministrativeExpense	173,813,000us-gaap_GeneralAndAdministrativeExpense
State apportionment rate adjustments					21,200,000us-gaap_DeferredTaxAssetsStateTaxes					21,200,000us-gaap_DeferredTaxAssetsStateTaxes
Conger Exchange Transaction
Selected Quarterly Financial Information [Line Items]
Gain on the sale of assets			280,100,000
Drummond Legal Settlement
Selected Quarterly Financial Information [Line Items]
General and administrative							52,500,000	35,000,000
Delaware and Permian Basin Properties
Selected Quarterly Financial Information [Line Items]
Gain on the sale of assets							$ 79,400,000