Derivative and Hedging Financial Instruments - Summary of Fair Value of Derivatives (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative assets fair value	$ 780,148us-gaap_DerivativeAssetsCurrent
Commodity derivative, Current liabilities	217,451us-gaap_DerivativeLiabilitiesCurrent	58,176us-gaap_DerivativeLiabilitiesCurrent
Commodity derivative, Noncurrent liabilities	831,106us-gaap_DerivativeLiabilitiesNoncurrent	67,597us-gaap_DerivativeLiabilitiesNoncurrent
Derivative liabilities fair value	1,048,557us-gaap_DerivativeLiabilities	125,773us-gaap_DerivativeLiabilities
Derivative assets fair value
Current Liabilities [Member]
Derivative [Line Items]
Commodity derivative, Current liabilities	217,451	58,176
Noncurrent Liabilities [Member]
Derivative [Line Items]
Commodity derivative, Noncurrent liabilities	831,106	67,597
Current Assets [Member]
Derivative [Line Items]
Commodity derivative, Current assets	780,148
Noncurrent Assets [Member]
Derivative [Line Items]
Commodity derivative, Noncurrent assets

Carrying amount as of the balance sheet date of the asset arising from commodity contracts such as futures contracts tied to the movement of a particular commodity, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.

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Carrying amount as of the balance sheet date of the asset arising from commodity contracts such as futures contracts tied to the movement of a particular commodity, which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer.

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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. 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.

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