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Dispositions - Additional Information (Detail) (USD $)	6 Months Ended				3 Months Ended	6 Months Ended		3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Permian Basin Assets	Feb. 26, 2013 Permian Basin Assets	Jun. 30, 2013 Pennsylvania	Jun. 30, 2013 Pennsylvania	Jun. 30, 2012 Marcellus Shale	Mar. 31, 2012 East Texas
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Agreed upon sales price of Permian Basin properties				$ 275,000,000
Gain (Loss) on sale of oil and gas properties	83,121,000	(13,653,000)	83,500,000		4,000,000		(2,500,000)	(10,900,000)
Selling expenses for property sale			4,200,000
Proceeds from disposal of assets	$ 296,068,000	$ 15,620,000			$ 14,200,000	$ 10,000,000	$ 2,500,000	$ 8,600,000
Sale of oil and gas properties								75.00%
Overriding royalty in the prospect minimum								2.50%
Overriding royalty in the prospect maximum								5.00%

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Gain (loss) recorded from sale of oil and gas properties, includes the realized gains (losses) on the sale of proved and unproved oil and gas properties.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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