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Fair Value Measurements - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended			3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2012 Fair Value Measurements Level 3	Jun. 30, 2012 Fair Value Measurements Level 3	Jun. 30, 2013 Oil Basis Swaps Fair Value Measurements Level 3	Dec. 31, 2012 Oil Basis Swaps Fair Value Measurements Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis
Total net derivative contracts	$ 83,082		$ 19,992			$ 0	$ (512)
Unrealized losses (gains) on derivatives	$ (63,520)	$ (455,138)		$ (1,400)	$ 200

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-Section 50

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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 Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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