Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Unearned premiums	$ 18,507	$ 17,060
Unearned commission	7,964	10,053
Net operating loss	436	1,189
Tax-related discount on loss reserve	5,162	4,902
Stock-based compensation	331	297
Accrued expenses	1,677	1,016
Leases	940	885
Unrealized losses	11,655	16,987
Dual Consolidated loss limitation	0	9,740
Other	473	238
Total deferred tax asset	47,145	62,367
Valuation allowance	0	(6,376)
Adjusted deferred tax asset	47,145	55,991
Deferred tax liabilities:
Deferred acquisition costs	24,366	23,420
Prepaid expenses	189	180
Property and equipment	359	2,200
Note discount	152	290
Basis in purchased investments	8	28
Basis in purchased intangibles	9,327	11,178
Other	1,633	1,854
Total deferred tax liabilities	36,034	39,150
Net deferred tax assets	$ 11,111	$ 16,841