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Indebtedness - Debt Outstanding (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Senior notes $ 2,376,438 $ 2,675,763
Senior subordinated notes 37,338 48,980
Total debt 3,115,776 3,201,743
Unamortized premium 456 3,013
Unamortized debt issuance costs (30,625) (31,819)
Total debt (net of debt issuance costs) 3,085,607 3,172,937
2.2% Bank Debt | Notes Payable to Banks    
Debt Instrument [Line Items]    
Bank debt (2.2%) 702,000 477,000
4.875% Senior Notes Due 2025    
Debt Instrument [Line Items]    
Senior notes 750,000 750,000
5.00% Senior Notes Due 2022    
Debt Instrument [Line Items]    
Senior notes 169,589 511,886
5.00% Senior Notes Due 2023    
Debt Instrument [Line Items]    
Senior notes 532,335 741,531
5.75% Senior Notes Due 2021    
Debt Instrument [Line Items]    
Senior notes 25,496 374,139
5.875% Senior Notes Due 2022    
Debt Instrument [Line Items]    
Senior notes 48,528 297,617
9.25% Senior Notes Due 2026    
Debt Instrument [Line Items]    
Senior notes 850,000 0
Other Senior Notes Due 2022    
Debt Instrument [Line Items]    
Senior notes 490 590
5.00% Senior Subordinated Notes Due 2022    
Debt Instrument [Line Items]    
Senior subordinated notes 9,730 19,054
5.00% Senior Subordinated Notes Due 2023    
Debt Instrument [Line Items]    
Senior subordinated notes 7,712 7,712
5.75% Senior Subordinated Notes Due 2021    
Debt Instrument [Line Items]    
Senior subordinated notes $ 19,896 $ 22,214