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Reinsurance - Prepaid Reinsurance Premiums (Payable) and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 109,401 $ 240,993    
Reinsurance recoverable on paid losses and LAE 39,257 69,729    
Reinsurance recoverable on unpaid losses and LAE 65,403 115,860 $ 118,671 $ 119,522
Reinsurance recoverable $ 104,660 $ 185,589