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Inventory Financing Agreements (Textual) (Detail)
barrel / d in Thousands
 3 Months Ended 9 Months Ended
Jun. 01, 2015
USD ($)
barrel / d
extension
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Feb. 29, 2016
USD ($)
installment
Dec. 31, 2015
USD ($)
Sep. 01, 2015
USD ($)
payment
Supply Commitment [Line Items]                
Supply and exchange agreement expenses   $ 11,232,000 $ 4,387,000 $ 21,951,000 $ 15,769,000      
Loss on termination of financing agreements   0 0 0 19,229,000      
Deferred finance costs, net   32,175,000   32,175,000     $ 4,907,000  
Supply and Offtake Agreements                
Supply Commitment [Line Items]                
Agreement term 3 years              
Number of commitment extensions | extension 2              
Commitment period 1 year              
Barrels of crude per day provided by J. Aron | barrel / d 94              
Handling fees   1,700,000 2,800,000 5,600,000 4,000,000      
Supply and exchange agreement expenses   900,000 600,000 2,200,000 900,000      
Amount of deferred payment arrangement $ 125,000,000 63,500,000   63,500,000        
Percentage of receivables and inventory for deferred payment arrangement 85.00%              
Deferral arrangement fee $ 1,300,000              
Description of Variable Rate Basis 90              
Outstanding amount of deferred payment arrangement   62,000,000   62,000,000        
Fee agreement receivable           $ 14,600,000.0   $ 18,000,000
Number of fee agreement payments           18   14
Fee agreement payable   $ (18,500,000)   $ (18,500,000)        
Supply and Exchange Agreements                
Supply Commitment [Line Items]                
Handling fees         6,900,000      
Supply and exchange agreement expenses     0   2,300,000      
Loss on termination of financing agreements         17,400,000      
Supply commitment, price variance loss         13,300,000      
Deferred finance costs, net     $ 5,600,000   5,600,000      
Supply commitment early contract termination fee         $ 1,500,000      
London Interbank Offered Rate (LIBOR) | Supply and Offtake Agreements                
Supply Commitment [Line Items]                
Margin on LIBOR rate 3.75%              
Deferred payment availability fee 0.75%