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Reinsurance - Prepaid Reinsurance Premiums (Payable) and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 175,208 $ 142,750    
Reinsurance recoverable on paid losses and LAE 70,015 25,238    
Reinsurance recoverable on unpaid losses and LAE 123,221 393,365 $ 182,405 $ 106
Reinsurance recoverable $ 193,236 $ 418,603