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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Reinsurance Disclosures [Abstract]            
Prepaid reinsurance premiums $ 453,018   $ 175,208      
Reinsurance recoverable on paid losses and LAE 20,753   70,015      
Reinsurance recoverable on unpaid losses and LAE 26,107 $ 66,158 123,221 $ 197,117 $ 269,071 $ 393,365
Reinsurance recoverable $ 46,860   $ 193,236