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Fair Value Measurements - Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
ASSETS:
Available-for-sale securities		$ 406,134us-gaap_AvailableForSaleSecurities
LIABILITIES:
Contingent consideration	747,000	685,000
Commodity swap contracts	3,023,271us-gaap_DerivativeAssetsCurrent
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
ASSETS:
Available-for-sale securities		406,134
LIABILITIES:
Contingent consideration	0	0
Commodity swap contracts	0
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
ASSETS:
Available-for-sale securities		0
LIABILITIES:
Contingent consideration	0	0
Commodity swap contracts	3,023,271
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
ASSETS:
Available-for-sale securities		0
LIABILITIES:
Contingent consideration	747,000	685,000
Commodity swap contracts	$ 0

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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