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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Reinsurance Disclosures [Abstract]    
Prepaid reinsurance premiums $ 310,618 $ 132,806
Reinsurance recoverable on paid losses and LAE 21,002  
Reinsurance recoverable on unpaid losses and LAE 96,849 182,405
Reinsurance receivable, net 1,402  
Reinsurance recoverable and receivable $ 119,253 $ 182,405