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Fair Value Measurements - Recurring Narrative (Detail) - USD ($)
 3 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Feb. 01, 2013
Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration, liability   $ 131,000,000 $ 130,000,000  
Galveston Bay Refinery and Related Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Maximum earnout payment, year four       $ 250,000,000
Maximum earnout payment, year five       250,000,000
Maximum earnout payment, year six       250,000,000
Total cumulative payment capped over six-year period       $ 700,000,000
Galveston Bay Refinery and Related Assets | Scenario, Forecast        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration payment $ 131,000,000      
Level 3 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration, liability [1]   131,000,000 130,000,000  
Level 1 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration, liability   0 $ 0  
Commodity derivatives | Level 3 | Ethanol prices | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Forward commodity price   0.24    
Commodity derivatives | Level 3 | Ethanol prices | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Forward commodity price   $ 1.16    
Embedded derivatives in commodity contracts        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Embedded derivative renewal term   5 years    
Embedded derivatives in commodity contracts | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Probability of renewal first term   50.00%    
Probability of renewal second term   75.00%    
[1] Includes $131 million and $130 million classified as current at March 31, 2017 and December 31, 2016, respectively.