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Indebtedness - Debt Outstanding (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Senior notes $ 2,614,731 $ 2,675,763
Senior subordinated notes 48,980 48,980
Total debt 3,220,711 3,201,743
Unamortized premium 1,305 3,013
Unamortized debt issuance costs (34,987) (31,819)
Total debt net of debt issuance costs 3,187,029 3,172,937
3.0% Bank Debt | Notes Payable to Banks    
Debt Instrument [Line Items]    
Bank debt (3.0%) 557,000 477,000
4.875% Senior Notes Due 2025    
Debt Instrument [Line Items]    
Senior notes 750,000 750,000
5.00% Senior Notes Due 2023    
Debt Instrument [Line Items]    
Senior notes 684,886 741,531
5.00% Senior Notes Due 2022    
Debt Instrument [Line Items]    
Senior notes 463,431 511,886
5.75% Senior Notes Due 2021    
Debt Instrument [Line Items]    
Senior notes 50,059 374,139
5.875% Senior Notes Due 2022    
Debt Instrument [Line Items]    
Senior notes 115,865 297,617
9.25% Senior Notes Due 2026    
Debt Instrument [Line Items]    
Senior notes 550,000 0
Other Senior Notes Due 2022    
Debt Instrument [Line Items]    
Senior notes 490 590
5.00% Senior Subordinated Notes Due 2023    
Debt Instrument [Line Items]    
Senior subordinated notes 7,712 7,712
5.00% Senior Subordinated Notes Due 2022    
Debt Instrument [Line Items]    
Senior subordinated notes 19,054 19,054
5.75% Senior Subordinated Notes Due 2021    
Debt Instrument [Line Items]    
Senior subordinated notes $ 22,214 $ 22,214