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Premiums Receivable - Summary of Activity in Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Premiums Receivable, Allowance for Doubtful Accounts [Roll Forward]    
Balance, beginning of year $ 4,852 $ 4,386
Provision for credit loss expense 648 1,011
Write-offs (826) (545)
Balance, end of year $ 4,674 $ 4,852