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Indebtedness - Debt Outstanding (Parenthetical) (Detail)
Mar. 31, 2017
Dec. 31, 2016
May 31, 2015
4.875% Senior Notes Due 2025      
Debt Instrument [Line Items]      
Interest rate on notes 4.875% 4.875% 4.875%
5.00% Senior Notes Due 2023      
Debt Instrument [Line Items]      
Interest rate on notes 5.00% 5.00%  
5.00% Senior Notes Due 2022      
Debt Instrument [Line Items]      
Interest rate on notes 5.00% 5.00%  
5.75% Senior Notes Due 2021      
Debt Instrument [Line Items]      
Interest rate on notes 5.75% 5.75%  
5.875% Senior Notes Due 2022      
Debt Instrument [Line Items]      
Interest rate on notes 5.875% 5.875%  
5.00% Senior Subordinated Notes Due 2023      
Debt Instrument [Line Items]      
Interest rate on notes 5.00% 5.00%  
5.00% Senior Subordinated Notes Due 2022      
Debt Instrument [Line Items]      
Interest rate on notes 5.00% 5.00%  
5.75% Senior Subordinated Notes Due 2021      
Debt Instrument [Line Items]      
Interest rate on notes 5.75% 5.75%  
Notes Payable to Banks | 2.5% Bank Debt      
Debt Instrument [Line Items]      
Bank debt percentage 2.50% 2.50%