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Results of Operations From Oil Producing Activities (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Results Of Operations Income Before Income Taxes [Line Items]
Production revenues	$ 8,496,519	$ 6,285,411
Production costs	(3,102,321)	(3,440,228)
Depletion and depreciation	(1,541,069)	(1,128,712)
Income tax	(1,305,513)	(583,600)
Results of operations for producing activities	$ 2,547,616	$ 1,132,871

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Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities.

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Income tax expense for oil and gas producing activities.

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The results of operations for oil and gas producing activities, excluding corporate overhead and interest costs.

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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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Total revenues from oil and gas producing activities.

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