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Summary of Calculation of Realized Gains and Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Equity securities, Total net realized investment gains (losses) $ 872 $ (914)
Less: net gains (losses) recognized during the period on equity securities sold during the period (11) 18
Unrealized gains (losses) recognized during the reporting period on equity securities still held $ 883 $ (932)