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Fair Value Measurements - Carrying Amounts and Fair Values of Financial Instruments (Parenthetical) (Detail)
Jun. 30, 2020
Mar. 31, 2020
Jan. 31, 2020
Dec. 31, 2019
5.75% Senior Notes Due 2021        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Interest rate on notes 5.75%   5.75% 5.75%
5.00% Senior Notes Due 2022        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Interest rate on notes 5.00% 5.00%   5.00%
5.875% Senior Notes Due 2022        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Interest rate on notes 5.875% 5.875% 5.875% 5.875%
5.00% Senior Notes Due 2023        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Interest rate on notes 5.00% 5.00%   5.00%
4.875% Senior Notes Due 2025        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Interest rate on notes 4.875%     4.875%
9.25% Senior Notes Due 2026        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Interest rate on notes 9.25%   9.25%  
5.75% Senior Subordinated Notes Due 2021        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Interest rate on notes 5.75%     5.75%
5.00% Senior Subordinated Notes Due 2022        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Interest rate on notes 5.00%     5.00%
5.00% Senior Subordinated Notes Due 2023        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Interest rate on notes 5.00%     5.00%