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Acquisitions and Divestitures - Additional Information (Detail) (Appalachian Region except Marcellus Shale [Member], USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Jul. 31, 2012	Sep. 30, 2012	Jun. 30, 2012
Appalachian Region except Marcellus Shale [Member]
Business Acquisition [Line Items]
Proceeds from sale of legacy natural gas assets in West Virginia, Kentucky and Virginia	$ 100
Impairment of Oil and Gas Properties			28.6
Gain (Loss) on Sale of Oil and Gas Property		$ 1.7

Gain (loss) recorded from sale of oil and gas properties, includes the realized gains (losses) on the sale of proved and unproved oil and gas properties.

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- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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- Definition

The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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