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Allowance for Credit Losses - Premiums Receivable and Reinsurance Receivables - Schedule of Allowance for Credit Losses Related to Premiums Receivable and Reinsurance Receivables (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Premiums Receivable    
Beginning balance $ 2,931 $ 2,754
Current period provision for expected credit losses 476 951
Write-offs (538) (836)
Ending balance 2,869 2,869
Reinsurance Receivables    
Beginning balance 8,992 8,992
Current period provision for expected credit losses 0 0
Write-offs 0 0
Ending balance $ 8,992 $ 8,992