Derivative and Hedging Financial Instruments - Summary of Fair Value of Derivatives (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Commodity derivative, Current assets	$ 5,420,309us-gaap_DerivativeAssetsCurrent
Commodity derivative, Noncurrent assets	2,809,847us-gaap_DerivativeAssetsNoncurrent
Derivative assets fair value	8,230,156us-gaap_DerivativeAssets	125,773us-gaap_DerivativeAssets
Commodity derivative, Current liabilities		58,176us-gaap_DerivativeLiabilitiesCurrent
Commodity derivative, Noncurrent liabilities	716,488us-gaap_DerivativeLiabilitiesNoncurrent	67,597us-gaap_DerivativeLiabilitiesNoncurrent
Derivative liabilities fair value	716,488us-gaap_DerivativeLiabilities	125,773us-gaap_DerivativeLiabilities
Commodity Contract [Member]
Derivative [Line Items]
Commodity derivative, Current assets	5,420,309	58,176
Commodity derivative, Noncurrent assets	2,809,847	67,597
Derivative assets fair value	8,230,156
Commodity derivative, Current liabilities		58,176
Commodity derivative, Noncurrent liabilities	716,488	67,597
Derivative liabilities fair value	$ 716,488	$ 125,773

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details