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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Reinsurance Disclosures [Abstract]            
Prepaid reinsurance premiums $ 333,062   $ 175,208      
Reinsurance recoverable on paid losses and LAE 35,749   70,015      
Reinsurance recoverable on unpaid losses and LAE 59,329 $ 26,107 123,221 $ 110,313 $ 197,117 $ 393,365
Reinsurance recoverable $ 95,078   $ 193,236