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Supplementary Information on Oil And Gas Producing Activities (Unaudited) - Summary of Standardized Measure of Discontinued Future Net Cash Flows (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Extractive Industries [Abstract]    
Future Cash Inflows $ 186,892,866 $ 212,933,565
Future Production Costs (71,482,928) (80,504,937)
Future Development Costs   (18,845,514)
Future Income Tax Expense (23,081,988) (22,716,623)
Future Net Cash Flows 92,327,950 90,866,491
Discounted for Estimated Timing of Cash Flows (48,013,950) (56,571,491)
Standardized Measure of Discounted Future Net Cash Flows $ 44,314,000 $ 34,295,000