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Reinsurance - Prepaid Reinsurance Premiums (Payable) and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 142,750 $ 132,806    
Reinsurance recoverable on paid losses and LAE 25,238 0    
Reinsurance recoverable on unpaid losses and LAE 393,365 182,405 $ 106 $ 13,540
Reinsurance recoverable $ 418,603 $ 182,405