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Long-Term Debt and Other Liabilities - Summary of Redemption Prices Plus Accrued and Unpaid Interest (Detail) - 2024 Senior Secured Notes [Member]
9 Months Ended
Sep. 30, 2020
2021 [Member]  
Debt Instrument, Redemption [Line Items]  
Debt instrument redemption price, percentage 104.938%
2022 [Member]  
Debt Instrument, Redemption [Line Items]  
Debt instrument redemption price, percentage 102.469%
2023 and thereafter [Member]  
Debt Instrument, Redemption [Line Items]  
Debt instrument redemption price, percentage 100.00%