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Indebtedness - Debt Outstanding (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
May 31, 2015
Debt Instrument [Line Items]      
Senior notes $ 2,877,332 $ 2,877,832  
Senior subordinated notes 48,980 48,980  
Total debt 3,880,312 3,808,812  
Unamortized premium 6,659 7,258  
Unamortized debt issuance costs (38,382) (42,553)  
Total debt net of debt issuance costs 3,848,589 3,773,517  
2.7% Bank Debt | Notes Payable to Banks      
Debt Instrument [Line Items]      
Bank debt 954,000 882,000  
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 741,514 741,514  
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 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