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Indebtedness - Debt Outstanding (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
May. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Bank debt $ 364,000   $ 723,000
Senior subordinated notes 2,350,000   2,350,000
Total debt 3,464,000   3,073,000
Notes Payable to Banks | 1.5% Bank Debt      
Debt Instrument [Line Items]      
Bank debt 364,000   723,000
Senior Notes | 4.875% Senior Notes Due 2025      
Debt Instrument [Line Items]      
Senior notes 750,000 $ 750,000  
Senior Subordinated Notes | 6.75% Senior Subordinated Notes Due 2020      
Debt Instrument [Line Items]      
Senior subordinated notes 500,000   500,000
Senior Subordinated Notes | 5.75% Senior Subordinated Notes Due 2021      
Debt Instrument [Line Items]      
Senior subordinated notes 500,000   500,000
Senior Subordinated Notes | 5.00% Senior Subordinated Notes Due 2022      
Debt Instrument [Line Items]      
Senior subordinated notes 600,000   600,000
Senior Subordinated Notes | 5.00% Senior Subordinated Notes Due 2023      
Debt Instrument [Line Items]      
Senior subordinated notes $ 750,000   $ 750,000