Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail)
1 Months Ended 3 Months Ended
Aug. 31, 2018
Mar. 31, 2018
Mar. 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
7.250% 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