Fair Value Measurements - Additional Information (Detail) (John D. Oil and Gas Marketing [Member], USD $)	3 Months Ended
Mar. 31, 2014
John D. Oil and Gas Marketing [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Contingent earn out payment period	5 years
Targeted EBITDA amount for contingent earn out payments	$ 810,432
Earn out payment in case actual EBITDA remain less than target EBITDA	$ 0
Earn out payment in case actual EBITDA meets or exceeds target EBITDA	575000

For contingent consideration arrangements recognized in connection with a business combination, this element represents a description of the basis for determining the amount of the payment recorded.

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