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Indebtedness - Debt Outstanding (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Senior notes $ 2,877,349 $ 2,877,349
Senior subordinated notes 48,980 48,980
Total debt 3,869,329 4,137,329
Unamortized premium 4,741 6,027
Unamortized debt issuance costs (37,209) (34,550)
Total debt (net of debt issuance costs) 3,836,861 4,108,806
4.1% Bank Debt | Notes Payable to Banks    
Debt Instrument [Line Items]    
Bank debt (4.1%) 943,000 1,211,000
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 580,032 580,032
5.75% Senior Notes Due 2021    
Debt Instrument [Line Items]    
Senior notes 475,952 475,952
5.875% Senior Notes Due 2022    
Debt Instrument [Line Items]    
Senior notes 329,244 329,244
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