Notes Payable (Morgan Stanley Credit Agreement) - Additional Information (Detail) - Morgan Stanley [Member] - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	May 21, 2014
Debt Instrument [Line Items]
Credit Agreement fee	$ 6,242,874	$ 6,242,874
Remaining borrowing capacity	47,500,000	47,500,000
Interest expense related to amortization of loan costs	5,604,715	$ 10,975,296
Debt instrument, interest rate description		Interest at a per annum rate equal to 9% plus the greater of 1% or LIBOR, for a three month interest period.
Debt instrument, additional interest rate		1.00%
Debt instrument interest rate		9.00%
Accounting Standards Update 2015-03 [Member]
Debt Instrument [Line Items]
Reduction in balance of notes payable-current		$ 1,775,092	$ 3,550,184
Interest expense related to amortization of loan costs		4,467,782	$ 2,692,690
American Shale [Member]
Debt Instrument [Line Items]
Initial withdrawal amount				$ 102,500,000
Estimated repayment amount if defaulted	$ 135,000,000	$ 135,000,000
American Shale [Member] | Committed [Member]
Debt Instrument [Line Items]
Remaining borrowing capacity				47,500,000
American Shale [Member] | Uncommitted [Member]
Debt Instrument [Line Items]
Remaining borrowing capacity				50,000,000
American Shale [Member] | Payment in Kind (PIK) Note [Member]
Debt Instrument [Line Items]
Credit Agreement fee				593,750
American Shale [Member] | Maximum [Member]
Debt Instrument [Line Items]
Credit facility, face amount				$ 200,000,000