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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Reinsurance Disclosures [Abstract]            
Prepaid reinsurance premiums $ 280,297   $ 142,750      
Reinsurance recoverable on paid losses and LAE 106,988   25,238      
Reinsurance recoverable on unpaid losses and LAE 110,313 $ 197,117 393,365 $ 127,943 $ 96,733 $ 182,405
Reinsurance recoverable $ 217,301   $ 418,603