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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Beginning and Ending Balances for Derivative Instrument Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 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 gain (loss) included in earnings (30,262) 11,454
Settlements, net 5,402 (22,585)
Transfers out of Level 3 (6,418) 0
Balance at end of period $ (53,866) $ (6,780)