Earnings Per Share - Summary of Numerator and Denominator of Basic and Fully Diluted (Loss) Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended																								12 Months Ended
		Dec. 31, 2022		Sep. 30, 2022		Jun. 30, 2022		Mar. 31, 2022		Dec. 31, 2021		Sep. 30, 2021		Jun. 30, 2021		Mar. 31, 2021		Dec. 31, 2020		Sep. 30, 2020		Jun. 30, 2020		Mar. 31, 2020		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net (loss) income		$ 2,651		$ (51,503)		$ (8,542)		$ 2,791		$ 1,435		$ (4,868)		$ 3,830		$ 6,845		$ 2,707		$ 15,390		$ 8,936		$ 547		$ (54,603)		$ 7,242		$ 27,580
Less: Net income attributable to redeemable noncontrolling interest																										(9,106)		(7,399)		0
Less: TypTap Group's net loss attributable to non-HCI common stockholders and TypTap Group's participating securities																										5,198		2,013
Net (loss) income after noncontrolling interests																										(58,511)		1,856		27,580
Less: (Income) loss attributable to participating securities																										3,463		(24)		(1,462)
Basic Earnings Per Share:
Income (loss) allocated to common stockholders (Numerator)																										$ (55,048)		$ 1,832		$ 26,118
Weighted Average Number of Shares Outstanding, Basic																										8,817	[1]	8,092	[2]	7,351	[3]
Basic (loss) earnings per share		$ 0.18		$ (5.66)		$ (1.04)		$ 0.09		$ 0.01		$ (0.72)		$ 0.25		$ 0.82		$ 0.35		$ 1.97		$ 1.16		$ 0.07		$ (6.24)		$ 0.23		$ 3.55
Diluted Earnings Per Share:
Net Income (Loss) Available to Common Stockholders, Diluted																										$ (55,048)		$ 1,832		$ 33,823
Weighted Average Number of Shares Outstanding, Diluted																										8,817	[1]	8,580	[2]	9,694	[3]
Earnings Per Share, Diluted		$ 0.18	[4]	$ (5.66)	[4]	$ (1.04)	[4]	$ 0.09	[4]	$ 0.01	[5]	$ (0.72)	[5]	$ 0.24	[5]	$ 0.75	[5]	$ 0.35	[6]	$ 1.68	[6]	$ 1.08	[6]	$ 0.07	[6]	$ (6.24)		$ 0.21		$ 3.49
Warrant [Member]
Effect of Dilutive Securities:
Dilutive Securities, Shares (Denominator)	[2],[7]																											281
Convertible Senior Notes [Member]
Effect of Dilutive Securities:
Convertible senior notes (Denominator)	[3]																													2,320
Convertible senior notes (Numerator)																														$ 7,705
Stock Options [Member]
Effect of Dilutive Securities:
Dilutive Securities, Shares (Denominator)																												207	[2],[7]	23	[3]

[1] Shares in thousands.

[2] Shares in thousands.

[3] Shares in thousands.

[4] During the quarter ended March 31, 2022, the convertible senior notes were antidilutive. During the quarters ended June 30, 2022, September 30, 2022 and December 31, 2022, the convertible senior notes, stock options and warrants were antidilutive.

[5] During the quarters ended June 30, 2021 and December 31, 2021, the convertible senior notes were antidilutive. During the quarter ended September 30, 2021, the convertible senior notes, stock options and warrants were antidilutive.

[6] During the quarters ended March 31, 2020 and December 31, 2020, the convertible senior notes were antidilutive.

[7] * Convertible senior notes were excluded due to antidilutive effect.