Premiums Receivable - Summary of Activity in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Premiums Receivable, Allowance for Doubtful Accounts [Roll Forward]
Balance, beginning of year	$ 4,386	$ 4,791
Provision for credit loss expense	1,011	1,090
Write-offs	(545)	(1,495)
Balance, end of year	$ 4,852	$ 4,386