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Allocation of Recorded Value of Net Assets Acquired in Transaction (Detail) (USD $) In Millions, unless otherwise specified	Jun. 18, 2012
Business Acquisition [Line Items]
Proved oil and gas properties.	$ 39.2
Unevaluated oil and gas properties.	1.6
Asset retirement obligations.	(14.4)
Total fair value of net assets.	$ 26.4

The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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