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Business Combinations and Acquisitions- Summary of Purchase Price Allocation (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Jan. 01, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 1,799 |  | $ 1,676
GreenHaven Commodity Services, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Assets |  | $ 205 |
Goodwill |  | 1,799 |
Intangible asset |  | 9,953 |
Total assets acquired |  | 11,957 |
Less: Liabilities |  | (132) |
Total |  | $ 11,825 |

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