Other Assets - Summary of Other Assets (Detail) - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Benefits receivable related to retrospective reinsurance contracts		$ 58,275	$ 44,289
Reimbursement and fees receivable under TPA services		0	629
Prepaid expenses		4,296	2,882
Deposits		401	409
Lease acquisition costs, net		849	833
Other		1,663	1,323
Total other assets	[1]	$ 65,484	$ 50,365

[1] See Note 13 for details of balances associated with consolidated variable interest entity.