Segment Information - Summary of Segment Information Reconciled to Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue:
Gross premiums earned	$ 181,124	$ 139,440	$ 360,049	$ 270,382
Premiums ceded	(56,205)	(46,436)	(109,367)	(89,535)
Net premiums earned	124,919	93,004	250,682	180,847
Net income (loss) from investment portfolio	(556)	6,731	(1,578)	12,169
Policy fee income	1,052	992	2,109	1,962
Other	511	777	1,753	1,400
Total revenue	125,926	101,504	252,966	196,378
Expenses:
Losses and loss adjustment expenses	86,830	55,917	159,534	101,668
Amortization of deferred policy acquisition costs	23,071	26,093	51,595	43,477
Other policy acquisition expenses	3,814	(2,924)	4,760	2,757
Stock-based compensation expense	4,242	4,155	8,579	6,497
Interest expense	1,515	2,000	2,116	4,079
Depreciation and amortization	1,235	663	2,064	1,101
Personnel and other operating expenses	16,779	10,503	31,877	21,600
Total expenses	137,486	96,407	260,525	181,179
(Loss) income before income taxes	(11,560)	5,097	(7,559)	15,199
Gross premiums written	186,152	184,978	363,446	310,826
Operating Segments [Member] | HCPCI Insurance Operations [Member]
Revenue:
Gross premiums earned	115,636	102,850	234,941	207,371
Premiums ceded	(36,979)	(36,101)	(73,932)	(72,081)
Net premiums earned	78,657	66,749	161,009	135,290
Net income (loss) from investment portfolio	(1,446)	3,550	(2,903)	4,430
Policy fee income	628	701	1,282	1,413
Other	414	812	1,661	1,333
Total revenue	78,253	71,812	161,049	142,466
Expenses:
Losses and loss adjustment expenses	48,692	39,641	92,687	73,080
Amortization of deferred policy acquisition costs	15,904	20,540	35,006	33,287
Other policy acquisition expenses	679	(5,070)	1,342	(246)
Stock-based compensation expense	1,187	937	2,331	1,698
Interest expense
Depreciation and amortization	153	18	267	38
Personnel and other operating expenses	7,738	4,665	15,056	9,723
Total expenses	74,353	60,731	146,689	117,580
(Loss) income before income taxes	3,900	11,081	14,360	24,886
Total revenue from non-affiliates	76,276	70,914	158,009	141,114
Gross premiums written	113,139	124,222	204,280	205,210
Operating Segments [Member] | Real Estate Operations [Member]
Revenue:
Other	2,765	2,379	5,168	7,513
Total revenue	2,765	2,379	5,168	7,513
Expenses:
Interest expense	224	259	451	741
Depreciation and amortization	606	574	1,211	1,161
Personnel and other operating expenses	626	1,317	1,933	2,518
Total expenses	1,456	2,150	3,595	4,420
(Loss) income before income taxes	1,309	229	1,573	3,093
Total revenue from non-affiliates	2,427	2,041	4,491	6,836
Operating Segments [Member] | Corporate and Other [Member]
Revenue:
Net income (loss) from investment portfolio	(1,228)	2,392	(912)	3,887
Other	1,472	267	2,308	827
Total revenue	244	2,659	1,396	4,714
Expenses:
Stock-based compensation expense	2,158	1,618	4,466	2,832
Interest expense	1,291	1,766	1,665	3,518
Depreciation and amortization	302	364	474	540
Personnel and other operating expenses	1,913	641	3,647	2,335
Total expenses	5,664	4,389	10,252	9,225
(Loss) income before income taxes	(5,420)	(1,730)	(8,856)	(4,511)
Total revenue from non-affiliates	359	2,715	90	4,239
Operating Segments [Member] | TypTap [Member]
Revenue:
Gross premiums earned	67,443	39,000	128,065	67,811
Premiums ceded	(20,629)	(12,585)	(37,562)	(22,094)
Net premiums earned	46,814	26,415	90,503	45,717
Net income (loss) from investment portfolio	283	495	267	831
Policy fee income	424	291	827	549
Other	532	475	1,001	650
Total revenue	48,053	27,676	92,598	47,747
Expenses:
Losses and loss adjustment expenses	38,692	16,440	67,680	28,752
Amortization of deferred policy acquisition costs	7,167	5,553	16,589	10,190
Other policy acquisition expenses	3,135	2,021	3,418	3,062
Stock-based compensation expense	897	1,600	1,782	1,967
Interest expense	211		411	90
Depreciation and amortization	774	312	1,335	600
Personnel and other operating expenses	8,526	6,233	16,019	11,355
Total expenses	59,402	32,159	107,234	56,016
(Loss) income before income taxes	(11,349)	(4,483)	(14,636)	(8,269)
Total revenue from non-affiliates	49,009	27,813	93,832	48,192
Gross premiums written	73,013	60,725	159,166	105,615
Intersegment Eliminations [Member]
Revenue:
Gross premiums earned	(1,955)	(2,410)	(2,957)	(4,800)
Premiums ceded	1,403	2,250	2,127	4,640
Net premiums earned	(552)	(160)	(830)	(160)
Net income (loss) from investment portfolio	1,835	294	1,970	3,021
Other	(4,672)	(3,156)	(8,385)	(8,923)
Total revenue	(3,389)	(3,022)	(7,245)	(6,062)
Expenses:
Losses and loss adjustment expenses	(554)	(164)	(833)	(164)
Amortization of deferred policy acquisition costs
Other policy acquisition expenses		125		(59)
Stock-based compensation expense
Interest expense	(211)	(25)	(411)	(270)
Depreciation and amortization	(600)	(605)	(1,223)	(1,238)
Personnel and other operating expenses	(2,024)	(2,353)	(4,778)	(4,331)
Total expenses	$ (3,389)	$ (3,022)	$ (7,245)	$ (6,062)