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Indebtedness - Early Extinguishment of Debt - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jan. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Aug. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]                    
Repayment of notes by early cash tender premium amount $ 5,300,000 $ 15,100,000 $ 5,300,000       $ 5,300,000      
Early cash tender offer period 10 days 10 days                
Gain (Loss) on early extinguishment of debt     (7,821,000)     $ 2,985,000 $ 14,093,000 $ 2,985,000    
5.75% Senior Notes Due 2021 and 5.0% senior notes due 2022 and 5.875% Senior Notes Due 2022 and 5.75% senior subordinated notes due 2021                    
Debt Instrument [Line Items]                    
Cash tender principal amount $ 500,000.0                  
Gain (Loss) on early extinguishment of debt     8,000,000.0              
5.75% Senior Subordinated Notes Due 2021                    
Debt Instrument [Line Items]                    
Extinguishment of debt, principal amount     $ 760,000,000,000 $ 349,000,000,000            
Interest rate on notes 5.75%   5.75% 5.75%     5.75%     5.75%
5.00% Senior Notes Due 2022                    
Debt Instrument [Line Items]                    
Extinguishment of debt, principal amount     $ 1,000,000.0              
Interest rate on notes 5.00%   5.00%       5.00%      
5.875% Senior Notes Due 2022                    
Debt Instrument [Line Items]                    
Extinguishment of debt, principal amount     $ 66,000 $ 2,200,000 $ 5,800,000          
Interest rate on notes 5.875% 5.875% 5.875% 5.875% 5.875%   5.875%     5.875%
5.00% Senior Subordinated Notes Due 2022                    
Debt Instrument [Line Items]                    
Extinguishment of debt, principal amount     $ 1,000,000.0              
Interest rate on notes 5.00%   5.00%       5.00%      
5.00% Senior Notes Due 2022, 5.875% Senior Notes Due 2022 and 5.00% Senior Notes Due 2023                    
Debt Instrument [Line Items]                    
Gain (Loss) on early extinguishment of debt     $ 200,000 $ 9,000,000.0 $ 30,400,000          
5.75% Senior Notes Due 2021 and 5.875% Senior Notes Due 2022                    
Debt Instrument [Line Items]                    
Cash tender principal amount   $ 500,000,000.0                
Gain (Loss) on early extinguishment of debt         (17,500,000)          
5.00% Senior Notes Due 2022                    
Debt Instrument [Line Items]                    
Extinguishment of debt, principal amount       $ 1,800,000 $ 48,500,000          
Interest rate on notes 5.00%   5.00% 5.00% 5.00%   5.00%     5.00%
5.00% Senior Notes Due 2023                    
Debt Instrument [Line Items]                    
Extinguishment of debt, principal amount       $ 30,200,000 $ 56,600,000          
Interest rate on notes 5.00%   5.00% 5.00% 5.00%   5.00%     5.00%
5.75% Senior Notes Due 2021                    
Debt Instrument [Line Items]                    
Extinguishment of debt, principal amount       $ 12,500,000            
Interest rate on notes 5.75% 5.75% 5.75% 5.75%     5.75%   5.75% 5.75%