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Reinsurance - Prepaid Reinsurance Premiums (Payable) and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 240,993 $ 215,723    
Reinsurance recoverable on paid losses and LAE 69,729 40,895    
Reinsurance recoverable on unpaid losses and LAE 115,860 119,522 $ 123,221 $ 393,365
Reinsurance recoverable $ 185,589 $ 160,417