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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Commitments And Contingencies Disclosure [Line Items]
Legal Settlement for Drummond Lawsuit	$ 87.5
Transportation commitments future minimum transportation fees due nine months change	$ 150.0
Number of years transportation commitments future minimum transportation fees due nine months change	10 years

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Number Of Years Transportation Commitments Future Minimum Transportation Fees Due During Period.

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Transportation Commitments Future Minimum Transportation Fees Due During Period.

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The amount of cash paid for the settlement of litigation or for other legal issues during 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 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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