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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Commitments And Contingencies Disclosure [Line Items]
Interest accrues on alleged damages	12.00%
Estimated damage claimed by plaintiff	$ 140
Revised Loss Contingency Damages Sought	160
Loss contingency accruaed	35.0
Transportation commitments future minimum transportation fees due first quarter change	63.0
Hydraulic fracturing commitment first quarter change	$ 24.0
Number of years transportation commitments future minimum transportation fees due first quarter change	10 years

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Hydraulic fracturing commitment first quarter change.

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Percentage Of Interest On Damages Awarded

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Revised loss contingency damages sought

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The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 value (monetary amount) of the award the plaintiff seeks in the legal matter.

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