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Indebtedness - Debt Outstanding (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Jan. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Senior notes $ 2,976,438   $ 2,376,438
Senior subordinated notes 37,338   37,338
Total debt 3,137,776   3,115,776
Unamortized premium 387   456
Unamortized debt issuance costs (37,569)   (30,625)
Total debt net of debt issuance costs 3,100,594   3,085,607
Less current maturities of long-term debt [1] (45,377)   (45,356)
Total long-term debt 3,055,217   3,040,251
2.3% Bank Debt | Notes Payable to Banks      
Debt Instrument [Line Items]      
Bank debt (2.3%) 124,000   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 25,496   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 490   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 9,730   9,730
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   $ 19,896
[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