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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Beginning and Ending Balances for Derivative Instrument Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of year $ (22,588) $ 4,351
Total unrealized loss included in earnings (113,018) (27,450)
Settlements, net 21,881 (33,143)
Transfers out of Level 3 (6,418) 0
Balance at end of period $ (120,143) $ (56,242)