Earnings Per Share - Summary of Numerator and Denominator of Basic and Fully Diluted (Loss) Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended																								12 Months Ended
		Dec. 31, 2023		Sep. 30, 2023		Jun. 30, 2023		Mar. 31, 2023		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, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net (loss) income		$ 40,913		$ 15,669		$ 14,882		$ 17,793		$ 2,651		$ (51,503)		$ (8,542)		$ 2,791		$ 1,435		$ (4,868)		$ 3,830		$ 6,845		$ 89,257	$ (54,603)	$ 7,242
Less: Net income attributable to redeemable noncontrolling interest																										(9,370)	(9,106)	(7,399)
Less: TypTap Group's net loss attributable to non-HCI common stockholders and TypTap Group's participating securities																										(853)	5,198	2,013
Net income attributable to HCI																										79,034	(58,511)	1,856
Net income (loss) after noncontrolling interests																										79,034	(58,511)	1,856
Less: (Income) loss attributable to participating securities																										(2,625)	3,463	(24)
Basic Earnings Per Share:
Income allocated to common stockholders																										$ 76,409	$ (55,048)	$ 1,832
Weighted Average Number of Shares Outstanding, Basic	[1]																									8,367,000	8,817,000	8,092,000
Basic earnings (loss) per share		$ 4.31		$ 1.53		$ 1.45		$ 1.78		$ 0.18		$ (5.66)		$ (1.04)		$ 0.09		$ 0.01		$ (0.72)		$ 0.25		$ 0.82		$ 9.13	$ (6.24)	$ 0.23
Diluted Earnings Per Share:
Net Income (Loss) Available to Common Stockholders, Diluted																										$ 84,141	$ (55,048)	$ 1,832
Weighted Average Number of Shares Outstanding, Diluted	[1]																									11,044,000	8,817,000	8,580,000
Earnings Per Share, Diluted		$ 3.4	[2]	$ 1.34	[2]	$ 1.28	[2]	$ 1.54	[2]	$ 0.18	[3]	$ (5.66)	[3]	$ (1.04)	[3]	$ 0.09	[3]	$ 0.01	[4]	$ (0.72)	[4]	$ 0.24	[4]	$ 0.75	[4]	$ 7.62	$ (6.24)	$ 0.21
Warrant [Member]
Effect of Dilutive Securities:
Dilutive Securities, Shares (Denominator)	[1]																									56,000		281,000
Convertible Senior Notes [Member]
Effect of Dilutive Securities:
Convertible senior notes (Denominator)	[1]																									2,538,000
Convertible senior notes (Numerator)																										$ 7,732
Stock Options [Member]
Effect of Dilutive Securities:
Dilutive Securities, Shares (Denominator)	[1]																									83,000		207,000

[1] Shares in thousands.

[2] During the quarter ended March 31, 2023, warrants were antidilutive.

[3] 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

[4] 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.