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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 57,100 $ 142,750    
Reinsurance recoverable on paid losses and LAE 54,223 25,238    
Reinsurance recoverable on unpaid losses and LAE 269,071 393,365 $ 70,351 $ 182,405
Reinsurance recoverable and receivable $ 323,294 $ 418,603