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Reinsurance - Change in Allowance for Credit Losses on Amounts Recoverable from Reinsurers (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Insurance [Abstract]    
Balance, beginning of period $ 360 $ 372
Provision for credit loss expense (benefit) (60) (12)
Balance, end of period $ 300 $ 360