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Summary of Calculation of Realized Gains and Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]        
Net realized gains (losses) $ (3,967) $ 289 $ (3,683) $ 1,373
Less: net gains (losses) recognized during the period on equity securities sold during the period 0 (157) 0 (423)
Unrealized gains (losses) recognized during the reporting period on equity securities still held $ (3,967) $ 446 $ (3,683) $ 1,796