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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Reinsurance Disclosures [Abstract]            
Prepaid reinsurance premiums $ 381,982   $ 142,750      
Reinsurance recoverable on paid losses and LAE 134,450   25,238      
Reinsurance recoverable on unpaid losses and LAE 197,117 $ 269,071 393,365 $ 96,733 $ 70,351 $ 182,405
Reinsurance recoverable $ 331,567   $ 418,603