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Related Party Transactions - Schedule of Accounts Receivable due from Related Parties (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]    
Due from related parties $ 1,321 $ 1,532
Center Oil [Member]    
Related Party Transaction [Line Items]    
Due from related parties 676 564
United Energy Trading [Member]    
Related Party Transaction [Line Items]    
Due from related parties $ 645 528
Gulf Coast Asphalt Company, L.L.C. [Member]    
Related Party Transaction [Line Items]    
Due from related parties [1]   $ 440
[1] GCAC is no longer considered a related party of the Partnership