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Reinsurance - Prepaid Reinsurance Premiums (Payable) and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 88,499 $ 236,254    
Reinsurance recoverable on paid losses and LAE 23,610 35,667    
Reinsurance recoverable on unpaid losses and LAE 101,036 183,435 $ 669,946 $ 798,680
Reinsurance recoverable $ 124,646 $ 219,102