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Indebtedness - Debt Outstanding (Parenthetical) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Jan. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Current maturities of long-term debt [1] $ 45,377   $ 45,356
4.875% Senior Notes Due 2025      
Debt Instrument [Line Items]      
Interest rate on notes 4.875%   4.875%
5.00% Senior Notes Due 2022      
Debt Instrument [Line Items]      
Interest rate on notes 5.00%   5.00%
5.00% Senior Notes Due 2023      
Debt Instrument [Line Items]      
Interest rate on notes 5.00%   5.00%
5.75% Senior Notes Due 2021      
Debt Instrument [Line Items]      
Interest rate on notes 5.75%   5.75%
5.875% Senior Notes Due 2022      
Debt Instrument [Line Items]      
Interest rate on notes 5.875%   5.875%
8.25% Senior Notes Due 2029      
Debt Instrument [Line Items]      
Interest rate on notes 8.25% 8.25% 8.25%
9.25% Senior Notes Due 2026      
Debt Instrument [Line Items]      
Interest rate on notes 9.25%   9.25%
5.00% Senior Subordinated Notes Due 2022      
Debt Instrument [Line Items]      
Interest rate on notes 5.00%   5.00%
5.00% Senior Subordinated Notes Due 2023      
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% senior notes and subordinated senior notes due 2021      
Debt Instrument [Line Items]      
Current maturities of long-term debt $ 45,400    
Notes Payable to Banks | 2.3% Bank Debt      
Debt Instrument [Line Items]      
Bank debt percentage 2.30%   2.30%
[1] As of March 31, 2021, current maturities includes $45.4 million principal amount of our 5.75% senior and senior subordinated notes due 2021