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Inventory Financing Agreements(Textual) (Detail)
barrel / d in Thousands
 12 Months Ended
May 08, 2017
Jun. 01, 2015
USD ($)
barrel / d
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
payment
May 31, 2021
USD ($)
Dec. 21, 2017
Feb. 29, 2016
USD ($)
installment
Supply and exchange agreement expenses     $ 31,632,000 $ 28,506,000 $ 20,156,000      
Supply and Offtake Agreements                
Commitment period 1 year              
Barrels of crude per day provided by J. Aron | barrel / d   94            
Debt instrument, interest rate 7.00%              
Handling fees     13,700,000 7,800,000 6,900,000      
Supply and exchange agreement expenses     2,300,000 $ 3,200,000 1,500,000      
Amount of deferred payment arrangement   $ 125,000,000            
Percentage of receivables and inventory for deferred payment   85.00%            
Deferral arrangement fee   $ 1,300,000            
Current borrowing capacity     83,100,000          
Outstanding amount of deferred payment arrangement     41,100,000          
Fee agreement receivable     $ 7,100,000   $ 18,000,000     $ 14,600,000
Number of fee agreement payments         14     18
Supply and Exchange Agreements                
Handling fees         $ 6,900,000      
Supply and exchange agreement expenses         2,300,000      
Loss on termination of financing agreements         17,400,000      
Price variance loss commitment         13,300,000      
Accelerated deferred financing costs         5,600,000      
Exit fee received         $ 1,500,000      
London Interbank Offered Rate (LIBOR) | Supply and Offtake Agreements                
Margin on LIBOR rate   3.75%            
Deferred payment availability fee   0.75%            
Scenario, Forecast | Supply and Offtake Agreements                
Fee agreement receivable           $ 2,200,000    
7.75% Senior Secured Note due 2025                
Debt instrument, interest rate     7.75%          
7.75% Senior Secured Note due 2025 | Senior Notes                
Debt instrument, interest rate     7.75%       7.75%