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Related Party Transactions - Schedule of Accounts Receivable due from Related Parties (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]    
Due from related parties $ 480 $ 1,321
Center Oil [Member]    
Related Party Transaction [Line Items]    
Due from related parties $ 480 676
United Energy Trading, LLC [Member]    
Related Party Transaction [Line Items]    
Due from related parties [1]   $ 645
[1] GCAC and UET are no longer considered related parties of the Partnership