Derivative and Hedging Financial Instruments - Summary of Realized and Unrealized Gains and Losses Related to Derivative Instrument (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative [Line Items]
Total realized and unrealized gains recorded	$ 1,183,626	$ 7,375,180
Commodity Contract [Member]
Derivative [Line Items]
Realized gains on commodity derivatives	928,834	2,030,176
Change in fair value of commodity derivatives	$ 254,792	$ 5,345,004