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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 100,221 $ 215,723    
Reinsurance recoverable on paid losses and LAE 98,954 40,895    
Reinsurance recoverable on unpaid losses and LAE 118,671 119,522 $ 66,158 $ 123,221
Reinsurance recoverable $ 217,625 $ 160,417