Derivative and Hedging Financial Instruments - Summary of Fair Value of Derivatives (Detail) - USD ($)	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Commodity derivative, Current assets	$ 6,497,401	$ 5,420,309
Commodity derivative, Noncurrent assets	7,349,234	2,809,847
Derivative assets fair value	13,846,635	8,230,156
Commodity derivative, Current liabilities	255,500
Commodity derivative, Noncurrent liabilities	732,464	716,488
Derivative liabilities fair value	987,964	716,488
Commodity Contract [Member]
Derivative [Line Items]
Commodity derivative, Current assets	6,497,401	5,420,309
Commodity derivative, Noncurrent assets	7,349,234	2,809,847
Derivative assets fair value	13,846,635	8,230,156
Commodity derivative, Current liabilities	255,500
Commodity derivative, Noncurrent liabilities	732,464	716,488
Derivative liabilities fair value	$ 987,964	$ 716,488