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Loss Reserves - Change in Allowance for Credit Losses on Amounts Recoverable from Reinsurers (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Insurance [Abstract]        
Balance, beginning of period $ 294 $ 309 $ 300 $ 360
Provision for credit loss expense (benefit) (4) 13 (10) (38)
Balance, end of period $ 290 $ 322 $ 290 $ 322