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Supplemental Oil and Gas Disclosures - Results of Operations for Oil and Natural Gas Producing Activities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues	$ 670,491	$ 330,422	$ 128,927
Production costs	127,146	67,937	28,350
Depreciation, depletion and amortization	202,398	74,101	37,583
Exploration costs	3,250	1,685	297
Impairment of oil and gas properties	3,581	3,610	11,967
Loss on sale of properties		207
Income tax expenses	116,941	64,009	17,756
Results of operations for oil and gas producing activities	$ 217,175	$ 118,873	$ 32,974

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Gain (loss) recognized on the sale of oil and gas property or timber property.

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Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense.

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