Other Assets - Summary of Other Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Benefits receivable related to retrospective reinsurance contracts	$ 14,781	$ 3,064
Reimbursement receivable under TPA service	801	3,525
Prepaid expenses	3,384	2,853
Deposits	3,592	406
Lease acquisition costs, net	665	505
Other	3,382	4,364
Total other assets	$ 26,605	$ 14,717