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Indebtedness - Debt Outstanding (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Bank debt   $ 86,427
Senior notes $ 738,616 738,101
Senior subordinated notes 1,828,345 1,826,775
Total debt 2,566,961 2,651,303
4.875% Senior Notes Due 2025    
Debt Instrument [Line Items]    
Senior notes 738,616 738,101
Notes Payable to Banks | 3.8% Bank Debt    
Debt Instrument [Line Items]    
Bank debt [1]   86,427
Senior Subordinated Notes | 5.75% Senior Subordinated Notes Due 2021    
Debt Instrument [Line Items]    
Senior subordinated notes 494,565 494,095
Senior Subordinated Notes | 5.00% Senior Subordinated Notes Due 2022    
Debt Instrument [Line Items]    
Senior subordinated notes 592,766 592,223
Senior Subordinated Notes | 5.00% Senior Subordinated Notes Due 2023    
Debt Instrument [Line Items]    
Senior subordinated notes $ 741,014 $ 740,457
[1] As of June 30, 2016, there were unamortized debt issuance costs of $4.1 million which exceeded our credit facility balance which were reclassified to other assets on our consolidated balance sheet.