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Indebtedness - Debt Outstanding (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Jan. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Senior notes $ 2,950,452   $ 2,376,438
Senior subordinated notes 0   37,338
Total debt 3,071,452   3,115,776
Unamortized premium 319   456
Unamortized debt issuance costs (35,114)   (30,625)
Total debt net of debt issuance costs 3,036,657   3,085,607
Less current maturities of long-term debt 0   (45,356)
Total long-term debt 3,036,657   3,040,251
2.2% Bank Debt | Notes Payable to Banks      
Debt Instrument [Line Items]      
Bank debt (2.2%) 121,000   702,000
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   169,589
5.00% Senior Notes Due 2023      
Debt Instrument [Line Items]      
Senior notes 532,335   532,335
5.75% Senior Notes Due 2021      
Debt Instrument [Line Items]      
Senior notes 0   25,496
5.875% Senior Notes Due 2022      
Debt Instrument [Line Items]      
Senior notes 48,528   48,528
8.25% Senior Notes Due 2029      
Debt Instrument [Line Items]      
Senior notes 600,000   0
Unamortized debt issuance costs   $ (9,200)  
Other Senior Notes Due 2022      
Debt Instrument [Line Items]      
Senior notes 0   490
9.25% Senior Notes Due 2026      
Debt Instrument [Line Items]      
Senior notes 850,000   850,000
5.00% Senior Subordinated Notes Due 2022      
Debt Instrument [Line Items]      
Senior subordinated notes 0   9,730
5.00% Senior Subordinated Notes Due 2023      
Debt Instrument [Line Items]      
Senior subordinated notes 0   7,712
5.75% Senior Subordinated Notes Due 2021      
Debt Instrument [Line Items]      
Senior subordinated notes $ 0   $ 19,896