LONG-TERM DEBT - Outstanding Debt (Parenthetical) (Detail)	Sep. 30, 2021	May 11, 2021	Dec. 31, 2020
8.500% Senior Secured Notes due 2029
Debt Disclosure [Line Items]
Long-term debt, interest rate	8.50%	8.50%
9.875% notes, due 2024
Debt Disclosure [Line Items]
Long-term debt, interest rate	9.875%
11.500% notes, due 2024
Debt Disclosure [Line Items]
Long-term debt, interest rate	11.50%
Private Placement | 9.875% notes, due 2024
Debt Disclosure [Line Items]
Long-term debt, interest rate	9.875%		9.875%
Private Placement | 11.500% notes, due 2024
Debt Disclosure [Line Items]
Long-term debt, interest rate	11.50%		11.50%