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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Reinsurance Disclosures [Abstract]            
Prepaid reinsurance premiums $ 386,466   $ 215,723      
Reinsurance recoverable on paid losses and LAE 52,215   40,895      
Reinsurance recoverable on unpaid losses and LAE 82,720 $ 113,157 119,522 $ 59,329 $ 26,107 $ 123,221
Reinsurance recoverable $ 134,935   $ 160,417