Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail)

v3.20.4
Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail)
1 Months Ended 12 Months Ended
May 31, 2020
Aug. 31, 2018
Mar. 31, 2018
Dec. 31, 2020
2.625% Convertible Senior Notes Due 2024 [Member]        
Debt Instrument [Line Items]        
Debt instrument interest rate     2.625% 2.625%
Debt instrument maturity date     Mar. 15, 2024 Mar. 15, 2024
7.875% Senior Notes Due 2025 [Member]        
Debt Instrument [Line Items]        
Debt instrument interest rate 7.875%     7.875%
Debt instrument maturity date Sep. 01, 2025     Sep. 01, 2025
7.250% Senior Notes Due 2026 [Member]        
Debt Instrument [Line Items]        
Debt instrument interest rate   7.25%   7.25%
Debt instrument maturity date   Aug. 15, 2026   Aug. 15, 2026