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Fair Value Measurements - Financial Assets and Liabilities Accounted at Fair Value (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity contracts	$ 8,230,156us-gaap_DerivativeAssets	$ 125,773us-gaap_DerivativeAssets
Commodity contracts	716,488us-gaap_DerivativeLiabilities	125,773us-gaap_DerivativeLiabilities
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity contracts	8,230,156
Commodity contracts	716,488	125,773
Fair Value Measurements Recurring [Member] \| Fair Value Measurements, Level 2 [Member] \| Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity contracts	8,230,156
Commodity contracts	$ 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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- 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