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Indebtedness - Debt Outstanding (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
May 31, 2015
Debt Instrument [Line Items]        
Senior notes $ 2,877,349 $ 2,877,849    
Senior subordinated notes 48,980 48,980    
Total debt 4,012,329 3,808,829    
Unamortized premium 6,336 7,241    
Unamortized debt issuance costs (36,703) (42,553)    
Total debt net of debt issuance costs 3,981,962 3,773,517    
2.8% Bank Debt | Notes Payable to Banks        
Debt Instrument [Line Items]        
Bank debt 1,086,000 882,000    
4.875% Senior Notes Due 2025        
Debt Instrument [Line Items]        
Senior notes 750,000 750,000   $ 750,000
5.00% Senior Notes Due 2023        
Debt Instrument [Line Items]        
Senior notes 741,531 741,531 $ 741,531  
5.00% Senior Notes Due 2022        
Debt Instrument [Line Items]        
Senior notes 580,032 580,032 580,032  
5.75% Senior Notes Due 2021        
Debt Instrument [Line Items]        
Senior notes 475,952 475,952 $ 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 1,090    
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