Accounts Payable Due to Drilling Operator - Additional Information (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Accounts Payable And Accrued Liabilities Current [Line Items]
Drilling operator charges incurred, but not paid	$ 1,203,986	$ 5,777,983
ASD Credit Agreement [Member]
Accounts Payable And Accrued Liabilities Current [Line Items]
Credit related to refund of prior drilling costs previously invoiced	$ 0	$ 708,467