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Summary of Calculation of Realized Gains and Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]        
Equity securities, Total net realized investment gains (losses) $ (174) $ (2,415) $ (1,088) $ (3,760)
Less: net gains (losses) recognized during the period on equity securities sold during the period 0 (498) 18 10,616
Unrealized gains (losses) recognized during the reporting period on equity securities $ (174) $ (1,917) $ (1,106) $ (14,376)