Assets and Liabilities Held for Sale - Additional Information (Detail)	Apr. 03, 2015 a Wells	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Summary Of Assets And Liabilities Held For Sale [Line Items]
Total assets held for sale		$ 13,475,975	$ 14,301,375
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]
Total assets held for sale		$ 13,475,975	$ 14,301,375