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Summary of Significant Accounting Policies - Reconciliation of Beginning and Ending Balances for Derivative Instrument Assets (Liabilities) (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]  
Balance at beginning of year $ 4,351
Total loss included in earnings (27,450)
Settlements, net (33,143)
Balance at end of period $ (56,242)