v2.4.0.6

Working Interest Acquisitions - Allocation of Total Purchase Price of Working Interest Acquisition (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 38% Working Interest Acquisition [Member]	Dec. 31, 2012 10% Working Interest Acquisition [Member]
Purchase price:
Acquisition price			$ 76,000	$ 21,500
Asset retirement obligations assumed			547	132
Post-closing purchase price adjustments			(5,720)	(453)
Total	70,827	21,179	70,827	21,179
Allocation:
Wells, equipment and related facilities			51,447	15,613
Mineral interests in oil and gas properties			19,380	5,566
Total			$ 70,827	$ 21,179

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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The amount of acquisition cost of a business combination allocated to assets acquired.

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The amount of acquisition cost of a business combination allocated to liabilities assumed.

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-Name Emerging Issues Task Force (EITF)

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The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

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Total remaining unamortized or unaccreted amounts of premiums, discounts, and intangible assets, in years subsequent to the year of acquisition, when the total amounts of remaining discounts, premiums, and intangible assets exceed 30 percent of stockholders' equity.

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Capitalized costs of proved properties that include fee ownership or a lease, concession, or other interest representing the right to extract oil or gas subject to such terms as may be imposed by the conveyance of that interest.

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