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Long-Term Debt - Long-term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 23, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Principal $ 500,000    
Debt issuance costs, net of amortization (35,802)    
Long-term debt 2,507,669   $ 2,500,132
Bank Credit Facility:      
Debt Instrument [Line Items]      
Principal 500,000    
7½% Senior Notes due 2025:      
Debt Instrument [Line Items]      
Principal 619,400    
Discount, net of amortization $ (151,483)    
Interest rate on debt instrument 7.50%    
9¾% Senior Notes due 2026:      
Debt Instrument [Line Items]      
Principal $ 1,650,000    
Discount, net of amortization $ (74,446)    
Interest rate on debt instrument 9.75% 9.75%