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DEBT - Revolving Credit Facility (Detail)
9 Months Ended
Sep. 30, 2019
USD ($)
fiscal_quarter
equity_cure_right
Dec. 31, 2018
USD ($)
Jun. 29, 2018
USD ($)
Debt Instrument [Line Items]      
Revolving credit facility borrowings $ 200,000,000 $ 200,000,000  
Letters of credit utilized 533,900,000 397,200,000  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Unamortized debt issuance costs 2,000,000.0 2,700,000  
Letters of credit utilized 82,600,000 62,300,000  
Line of credit available 517,400,000 $ 537,700,000  
Revolving Credit Facility | Restated Revolving Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity on line of credit     $ 600,000,000.0
Revolving credit facility borrowings $ 40,000,000.0    
Maximum consecutive days for financial covenant 5 days    
Number of consecutive fiscal quarters in which equity cure right can be used twice (in fiscal quarter) | fiscal_quarter 4    
Maximum number of times equity cure right can be exercised | equity_cure_right 5