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Cost Incurred in Property Acquisition, Exploration and Development Activities (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Acquisition of properties	$ 0	$ 1,422,590
Exploration costs	0	0
Development costs	10,247,539	4,926,105
Net capitalized costs	$ 10,247,539	$ 6,348,695

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

Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.