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Business Combinations and Acquisitions- Summary of Purchase Price Allocation (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Jan. 01, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 3,475   $ 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