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Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Jun. 18, 2012
Business Acquisition [Line Items]
Fair value of Land and Building at the time of Acquisition	$ 8.5
Purchase Consideration	8.5
Cash consideration transferred		$ 26.4
Block Deep Water Pompano Field Mississippi Canyon
Business Acquisition [Line Items]
Percentage of working interest acquired		25.00%
Mississippi Canyon Block 29
Business Acquisition [Line Items]
Percentage of working interest acquired		14.00%
Mississippi Canyon Block 72
Business Acquisition [Line Items]
Percentage of working interest acquired		10.00%

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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