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Indebtedness - Debt Outstanding (Parenthetical) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Aug. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Jan. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]            
Current maturities of long-term debt [1] $ 45,334         $ 0
4.875% Senior Notes Due 2025            
Debt Instrument [Line Items]            
Interest rate on notes 4.875%         4.875%
5.00% Senior Notes Due 2023            
Debt Instrument [Line Items]            
Interest rate on notes 5.00%   5.00% 5.00%   5.00%
5.00% Senior Notes Due 2022            
Debt Instrument [Line Items]            
Interest rate on notes 5.00%   5.00% 5.00%   5.00%
5.75% Senior Notes Due 2021            
Debt Instrument [Line Items]            
Interest rate on notes 5.75% 5.75% 5.75%   5.75% 5.75%
5.875% Senior Notes Due 2022            
Debt Instrument [Line Items]            
Interest rate on notes 5.875%   5.875% 5.875% 5.875% 5.875%
9.25% Senior Notes Due 2026            
Debt Instrument [Line Items]            
Interest rate on notes 9.25%         9.25%
5.00% Senior Subordinated Notes Due 2023            
Debt Instrument [Line Items]            
Interest rate on notes 5.00%         5.00%
5.00% Senior Subordinated Notes Due 2022            
Debt Instrument [Line Items]            
Interest rate on notes 5.00%         5.00%
5.75% Senior Subordinated Notes Due 2021            
Debt Instrument [Line Items]            
Interest rate on notes 5.75%   5.75%     5.75%
5.75% senior notes and subordinated senior notes due 2021            
Debt Instrument [Line Items]            
Current maturities of long-term debt $ 45,400          
Notes Payable to Banks | 2.2% Bank Debt            
Debt Instrument [Line Items]            
Bank debt percentage 2.20%         2.20%
[1] As of September 30, 2020, current maturities includes $45.4 million principal amount of our 5.75% senior and senior subordinated notes due 2021