Assets and Liabilities Held for Sale - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2016 USD ($) a Wells	Dec. 31, 2015 USD ($)
Summary Of Assets And Liabilities Held For Sale [Line Items]
Total assets held for sale		$ 13,460,614
Marcellus Shale Wells [Member]
Summary Of Assets And Liabilities Held For Sale [Line Items]
Acres of Land Sold | a	5,159
Number of wells | Wells	12
Wetzel County West Virginia [Member]
Summary Of Assets And Liabilities Held For Sale [Line Items]
Depletion	$ 4,372,965
Total assets held for sale	$ 0	$ 13,460,614