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Reinsurance - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Insurance [Abstract]      
Paid losses recoverable outstanding due date 90 days    
Received reinsurance recoveries $ 5.8 $ 4.4 $ 2.0
Unsecured reinsurance recoverable by reinsurer reporting threshold 1.50%