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Reinsurance - Prepaid Reinsurance Premiums (Payable) and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 236,254 $ 282,427    
Reinsurance recoverable on paid losses and LAE 35,667 10,170    
Reinsurance recoverable on unpaid losses and LAE 183,435 798,680 $ 115,860 $ 119,522
Reinsurance recoverable $ 219,102 $ 808,850