Income Taxes - Significant Components of Net Deferred Income Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Unearned premiums	$ 19,378	$ 12,588
Losses and loss adjustment expenses	3,331	3,013
Stock-based compensation	1,878	1,570
Unearned revenue	1,089	426
Net unrealized investment losses	732	428
Basis difference related to convertible senior notes	516	300
Accrued expenses	175	163
Credit losses	156	244
Organizational costs	116	128
Bad debt reserve	16	44
Net operating loss carryforwards	0	13,883
Other	17	85
Total deferred tax assets	27,404	32,872
Valuation allowance	0	(2,549)
Total deferred tax assets, net of valuation allowance	27,404	30,323
Deferred tax liabilities:
Gain on involuntary conversion	(11,460)	(12,500)
Deferred policy acquisition costs	(11,272)	(12,156)
Basis difference related to partnership investments	(2,249)	(2,942)
Prepaid expenses	(573)	(703)
Intangible assets	(541)	(1,878)
Property and equipment	(271)	(1,515)
Other	(526)	(333)
Total deferred tax liabilities	(26,892)	(32,027)
Net deferred tax liabilities	$ (512)	$ (1,704)