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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