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Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012
Disclosure - Basis of Presentation - Additional Information (Detail) [Line Items]
Retroactive Impact Fee			$ 24.7
Period related to annual impact fee per well drilled	15 years
Unrealized loss on commodity derivative contracts	$ 3.1	$ 25.5

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- Definition

Marcellus shale impact fee.

+ References

No definition available.

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- Definition

Period related to annual impact fee per well drilled.

+ References

No definition available.

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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 open derivatives, commodity, or energy 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

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