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Summary of Calculation of Realized Gains and Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]        
Equity securities, Total net realized investment gains (losses) $ (15) $ (60) $ (1,103) $ (3,820)
Less: net gains (losses) recognized during the period on equity securities sold during the period 15 0 32 10,616
Unrealized gains (losses) recognized during the reporting period on equity securities $ (30) $ (60) $ (1,135) $ (14,436)