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

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