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Reinsurance - Prepaid Reinsurance Premiums (Payable) and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 282,427 $ 240,993    
Reinsurance recoverable on paid losses and LAE 10,170 69,729    
Reinsurance recoverable on unpaid losses and LAE 798,680 115,860 $ 119,522 $ 123,221
Reinsurance recoverable $ 808,850 $ 185,589