2012 Property Disposition - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011 Wyoming [Member] MBoe	Feb. 29, 2012 Wyoming [Member]	Jun. 30, 2012 Oklahoma [Member]
Property Dispositions (Line Items)
Acquisitions and disposals proceeds		$ 84.4	$ 15.9
Recognized pre-tax gain		$ 50.1	$ 15.9
Net proved reserves, in MMBoe	3,200
Percentage of net proved reserves	1.00%
Production of total crude oil and natural gas production, in MBoe	259
Percent of production of total crude oil and natural gas production	1.00%

Oil And Gas Production Associated With Disposed Oil And Gas Properties

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- Definition

Percent Of Oil And Gas Production Associated With Disposed Oil And Gas Properties

+ References

No definition available.

+ Details

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- Definition

Percent Of Proved Reserves Associated With Disposed Oil And Gas Properties

+ References

No definition available.

+ Details

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- Definition

Proved Reserves Related To Disposed Oil And Gas Properties

+ References

No definition available.

+ Details

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- Definition

The value of all consideration given or received by the Entity in the significant acquisition or disposal.

+ References

No definition available.

+ Details

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- Definition

The difference between the value of the consideration received by the Entity on the sale or disposal and net book value of assets sold or disposed, before any tax related impact.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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