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Indebtedness - Debt Outstanding (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Senior notes $ 2,783,733 $ 2,877,349
Senior subordinated notes 48,980 48,980
Total debt 3,160,713 3,869,329
Unamortized premium 3,580 4,741
Unamortized debt issuance costs (30,303) (37,209)
Total debt net of debt issuance costs 3,133,990 3,836,861
3.3% Bank Debt | Notes Payable to Banks    
Debt Instrument [Line Items]    
Bank debt (3.3%) 328,000 943,000
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 741,531 741,531
5.00% Senior Notes Due 2022    
Debt Instrument [Line Items]    
Senior notes 547,110 580,032
5.75% Senior Notes Due 2021    
Debt Instrument [Line Items]    
Senior notes 421,425 475,952
5.875% Senior Notes Due 2022    
Debt Instrument [Line Items]    
Senior notes 323,077 329,244
Other Senior Notes Due 2022    
Debt Instrument [Line Items]    
Senior notes 590 590
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