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Loss Reserves - Change in Allowance for Credit Losses on Amounts Recoverable from Reinsurers (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Insurance [Abstract]    
Balance, beginning of period $ 440 $ 452
Provision for credit loss benefit (52) 0
Balance, end of period $ 388 $ 452