Derivative and Hedging Financial Instruments - Additional Information (Detail)	Dec. 23, 2014 MMBTU $ / MMBTU	Aug. 20, 2014 MMBTU $ / MMBTU	May 21, 2014 MMBTU $ / MMBTU	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Strike Price of fixed price hedges | $ / MMBTU		4.11
Morgan Stanley Fixed I [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed price covering percentage on its expected natural gas production			90.00%
Morgan Stanley Fixed I [Member] | July 2014 to November 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total MMBtu hedged over the period			13,932,171
Morgan Stanley Fixed I [Member] | Maximum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Strike Price of fixed price hedges | $ / MMBTU			4.38
Morgan Stanley Fixed I [Member] | Maximum [Member] | July 2014 to November 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Monthly volumes declining of MMBtu			444,534
Morgan Stanley Fixed I [Member] | Minimum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Strike Price of fixed price hedges | $ / MMBTU			4.06
Morgan Stanley Fixed I [Member] | Minimum [Member] | July 2014 to November 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Monthly volumes declining of MMBtu			171,940
Morgan Stanley Fixed II [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed price covering percentage on its expected natural gas production		90.00%
Strike Price of fixed price hedges | $ / MMBTU		3.92
Morgan Stanley Fixed II [Member] | January 2015 to November 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total MMBtu hedged over the period		10,499,038
Morgan Stanley Fixed II [Member] | Maximum [Member] | January 2015 to November 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Monthly volumes declining of MMBtu		326,700
Morgan Stanley Fixed II [Member] | Minimum [Member] | January 2015 to November 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Monthly volumes declining of MMBtu		45,854
Morgan Stanley Restrike [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Strike Price of fixed price hedges | $ / MMBTU		3.92
Current market price of fixed price hedges | $ / MMBTU		3.27
Morgan Stanley Fixed III [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed price covering percentage on its expected natural gas production	50.00%
Strike Price of fixed price hedges | $ / MMBTU	1.12
Total MMBtu hedged over the period	7,301,209
Morgan Stanley Fixed III [Member] | Maximum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Monthly volumes declining of MMBtu	266,891
Morgan Stanley Fixed III [Member] | Minimum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Monthly volumes declining of MMBtu	104,084
Price Risk Derivative [Member] | Morgan Stanley Restrike [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value of commodity contracts | $				$ 1,813,863	$ 5,841,395
Price Risk Derivative [Member] | Morgan Stanley Fixed III [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value of commodity contracts | $				$ 10,292	$ (1,727,720)