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Reinsurance - Prepaid Reinsurance Premiums (Payable) and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 215,723 $ 175,208    
Reinsurance recoverable on paid losses and LAE 40,895 70,015    
Reinsurance recoverable on unpaid losses and LAE 119,522 123,221 $ 393,365 $ 182,405
Reinsurance recoverable $ 160,417 $ 193,236