Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Schedule of Redemption Prices expressed as Percentages of Principal Amount (Detail)

v3.20.4
Long-Term Debt - Schedule of Redemption Prices expressed as Percentages of Principal Amount (Detail)
1 Months Ended 12 Months Ended
May 31, 2020
Aug. 31, 2018
Dec. 31, 2020
7.875% Senior Notes Due 2025 [Member]      
Debt Instrument Redemption [Line Items]      
Redemption prices, expressed as percentages of principal amount 100.00%    
7.875% Senior Notes Due 2025 [Member] | 2022 [Member]      
Debt Instrument Redemption [Line Items]      
Redemption prices, expressed as percentages of principal amount     103.938%
7.875% Senior Notes Due 2025 [Member] | 2023 [Member]      
Debt Instrument Redemption [Line Items]      
Redemption prices, expressed as percentages of principal amount     101.969%
7.875% Senior Notes Due 2025 [Member] | 2024 and Thereafter [Member]      
Debt Instrument Redemption [Line Items]      
Redemption prices, expressed as percentages of principal amount     100.00%
7.250% Senior Notes Due 2026 [Member]      
Debt Instrument Redemption [Line Items]      
Redemption prices, expressed as percentages of principal amount   100.00%  
7.250% Senior Notes Due 2026 [Member] | 2021 [Member]      
Debt Instrument Redemption [Line Items]      
Redemption prices, expressed as percentages of principal amount     103.625%
7.250% Senior Notes Due 2026 [Member] | 2022 [Member]      
Debt Instrument Redemption [Line Items]      
Redemption prices, expressed as percentages of principal amount     101.813%
7.250% Senior Notes Due 2026 [Member] | 2023 and Thereafter [Member]      
Debt Instrument Redemption [Line Items]      
Redemption prices, expressed as percentages of principal amount     100.00%