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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)

X

- 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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Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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