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Investment in Quest Resource Management Group, LLC - Net Assets and Liabilities Acquired (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Quest Resource Management Group, LLC [Member]	Jul. 16, 2013 Quest Resource Management Group, LLC [Member]	Jun. 30, 2014 Quest Resource Management Group, LLC [Member] Customer relationships [Member]	Jun. 30, 2014 Quest Resource Management Group, LLC [Member] Trademarks [Member]
Business Acquisition [Line Items]
Net assets and liabilities			$ 1,214,804
Intangible assets other than goodwill					12,720,000	6,230,000
Goodwill	58,337,290	58,337,290	83,885,196
Assets and liabilities acquired including goodwill net	$ 104,050,000			$ 104,050,000