Segment Information - Summary of Segment Information Reconciled to Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue:
Gross premiums earned	$ 178,925	$ 130,942
Premiums ceded	(53,162)	(43,099)
Net premiums earned	125,763	87,843
Net income (loss) from investment portfolio	(1,022)	5,438
Policy fee income	1,057	970
Other	1,242	623
Total revenue	127,040	94,874
Expenses:
Losses and loss adjustment expenses	72,704	45,751
Amortization of deferred policy acquisition costs	28,524	17,384
Other policy acquisition expenses	946	5,681
Stock-based compensation expense	4,337	2,342
Interest expense	601	2,079
Depreciation and amortization	829	438
Personnel and other operating expenses	15,098	11,097
Total expenses	123,039	84,772
Income before income taxes	4,001	10,102
Gross premiums written	177,294	125,848
Operating Segments [Member] | HCPCI Insurance Operations [Member]
Revenue:
Gross premiums earned	119,305	104,521
Premiums ceded	(36,953)	(35,980)
Net premiums earned	82,352	68,541
Net income (loss) from investment portfolio	(1,457)	880
Policy fee income	654	712
Other	1,247	521
Total revenue	82,796	70,654
Expenses:
Losses and loss adjustment expenses	43,995	33,439
Amortization of deferred policy acquisition costs	19,102	12,747
Other policy acquisition expenses	663	4,824
Stock-based compensation expense	1,144	761
Interest expense
Depreciation and amortization	114	20
Personnel and other operating expenses	7,318	5,058
Total expenses	72,336	56,849
Income before income taxes	10,460	13,805
Total revenue from non-affiliates	81,733	70,200
Gross premiums written	91,141	80,988
Operating Segments [Member] | Real Estate Operations [Member]
Revenue:
Other	2,403	5,134
Total revenue	2,403	5,134
Expenses:
Interest expense	227	482
Depreciation and amortization	605	587
Personnel and other operating expenses	1,307	1,201
Total expenses	2,139	2,270
Income before income taxes	264	2,864
Total revenue from non-affiliates	2,064	4,795
Operating Segments [Member] | Corporate and Other [Member]
Revenue:
Net income (loss) from investment portfolio	316	1,495
Other	836	560
Total revenue	1,152	2,055
Expenses:
Stock-based compensation expense	2,308	1,214
Interest expense	374	1,752
Depreciation and amortization	172	176
Personnel and other operating expenses	1,734	1,694
Total expenses	4,588	4,836
Income before income taxes	(3,436)	(2,781)
Total revenue from non-affiliates	449	1,524
Operating Segments [Member] | TypTap [Member]
Revenue:
Gross premiums earned	60,622	28,811
Premiums ceded	(16,933)	(9,509)
Net premiums earned	43,689	19,302
Net income (loss) from investment portfolio	(16)	336
Policy fee income	403	258
Other	469	175
Total revenue	44,545	20,071
Expenses:
Losses and loss adjustment expenses	28,988	12,312
Amortization of deferred policy acquisition costs	9,422	4,637
Other policy acquisition expenses	283	1,041
Stock-based compensation expense	885	367
Interest expense	200	90
Depreciation and amortization	561	288
Personnel and other operating expenses	7,493	5,122
Total expenses	47,832	23,857
Income before income taxes	(3,287)	(3,786)
Total revenue from non-affiliates	44,823	20,379
Gross premiums written	86,153	44,890
Intersegment Eliminations [Member]
Revenue:
Gross premiums earned	(1,002)	(2,390)
Premiums ceded	724	2,390
Net premiums earned	(278)
Net income (loss) from investment portfolio	135	2,727
Other	(3,713)	(5,767)
Total revenue	(3,856)	(3,040)
Expenses:
Losses and loss adjustment expenses	(279)
Other policy acquisition expenses		(184)
Interest expense	(200)	(245)
Depreciation and amortization	(623)	(633)
Personnel and other operating expenses	(2,754)	(1,978)
Total expenses	$ (3,856)	$ (3,040)