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Reinsurance - Prepaid Reinsurance Premiums (Payable) and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 124,308 $ 282,427    
Reinsurance recoverable on paid losses and LAE 8,148 10,170    
Reinsurance recoverable on unpaid losses and LAE 669,946 798,680 $ 65,403 $ 115,860
Reinsurance recoverable $ 678,094 $ 808,850