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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]
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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 |  |

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