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CREDIT AGREEMENT (Detail)
Jun. 14, 2018
USD ($)
Jul. 31, 2018
USD ($)
Nov. 22, 2017
USD ($)
Debt Instrument [Line Items]      
Revolving credit facility, maximum borrowing capacity $ 900,000,000.0    
Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving credit facility, permitted carry over of capital expenditure limitation   $ 20,000,000  
Revolving credit facility, annual capital expenditure limitations   125,000,000  
Line of credit      
Debt Instrument [Line Items]      
Increase in debt to total capitalization ratio (as percent) 5.00%    
Line of credit | 2018      
Debt Instrument [Line Items]      
Revolving credit facility, capital expenditure limitation $ 105,000,000.0    
Revolving credit facility, permitted carry over of capital expenditure limitation   20,000,000.0  
Line of credit | 2019      
Debt Instrument [Line Items]      
Revolving credit facility, capital expenditure limitation 110,000,000.0    
Line of credit | 2020      
Debt Instrument [Line Items]      
Revolving credit facility, capital expenditure limitation 115,000,000.0    
Line of credit | 2021      
Debt Instrument [Line Items]      
Revolving credit facility, capital expenditure limitation 120,000,000.0    
Line of credit | 2022      
Debt Instrument [Line Items]      
Revolving credit facility, capital expenditure limitation $ 125,000,000.0    
Line of credit | Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving credit facility, maximum debt to total capitalization ratio (as percent) 0.50    
Revolving credit facility, minimum net worth requirement   1,030,900,000  
Revolving credit facility, outstanding borrowings   0  
Revolving credit facility, remaining available balance   878,600,000  
Line of credit | Letter of Credit      
Debt Instrument [Line Items]      
Revolving credit facility, outstanding borrowings   $ 21,400,000  
Construction expenditure limitation | Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving credit facility, construction expenditure limitation     $ 135,000,000.0
Construction expenditure limitation | Revolving Credit Facility | Tyler, Texas      
Debt Instrument [Line Items]      
Revolving credit facility, construction expenditure limitation $ 250,000,000    
Construction expenditure limitation | Revolving Credit Facility | Unknown City and State      
Debt Instrument [Line Items]      
Revolving credit facility, construction expenditure limitation 210,000,000.0    
Construction expenditure limitation | Revolving Credit Facility | Floowood, Mississippi      
Debt Instrument [Line Items]      
Revolving credit facility, construction expenditure limitation 15,000,000.0    
Processing Complex | Revolving Credit Facility | Unknown City and State      
Debt Instrument [Line Items]      
Revolving credit facility, construction expenditure limitation 60,000,000.0    
Aircraft expenditure | Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving credit facility, capital expenditure limitation $ 70,000,000.0