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Supplemental Oil and Gas Disclosures - Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development Activities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Proved oil and gas properties	$ 3,159	$ 3,356	$ 20,259
Unproved oil and gas properties	34,098	15,197	81,624
Exploration costs	3,250	1,685	297
Development costs	1,074,441	618,737	243,758
Asset retirement costs	9,359	5,055	968
Total costs incurred	$ 1,124,307	$ 644,030	$ 346,906

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Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties.

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