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Acquisitions and Divestitures - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Jul. 31, 2012	Jun. 30, 2012
Acquisitions and Divestitures [Abstract]
Proceeds from sale of legacy natural gas assets in West Virginia, Kentucky and Virginia	$ 100
Impairment of Oil and Gas Properties		$ 28.6

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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