Earnings Per Share - Summary of Numerator and Denominator of Basic and Fully Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2022		Sep. 30, 2021		Sep. 30, 2022		Sep. 30, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net (loss) income	$ (51,503)		$ (4,868)		$ (57,254)		$ 5,807
Less: Net income attributable to redeemable noncontrolling interest	(2,285)		(2,202)		(6,801)		(5,175)
Less: TypTap Group's net loss attributable to non-HCI common stockholders and TypTap Group's participating securities	2,829		774		4,018		1,191
Net (loss) income attributable to HCI	(50,959)		(6,296)		(60,037)		1,823
Less: Loss (income) attributable to participating securities	3,289		537		3,855		(37)
Basic (Loss) Earnings Per Share:
(Loss) income allocated to common stockholders (Numerator)	$ (47,670)		$ (5,759)		$ (56,182)		$ 1,786
(Loss) Income allocated to common stockholders, Shares (Denominator)	8,427	[1]	8,023	[1]	8,972	[2]	7,676	[2]
(Loss) Income allocated to common stockholders, Per Share Amount	$ (5.66)		$ (0.72)		$ (6.26)		$ 0.23
Diluted Earnings Per Share:
(Loss) income available to common stockholders and assumed conversions, Income (Numerator)	$ (47,670)		$ (5,759)		$ (56,182)		$ 1,786
(Loss) income available to common stockholders and assumed conversions, Shares (Denominator)	8,427	[1]	8,023	[1]	8,972	[2]	8,092	[2]
(Loss) income available to common stockholders and assumed conversions, Per Share Amount	$ (5.66)		$ (0.72)		$ (6.26)		$ 0.22
Warrant [Member]
Diluted (Loss) Earnings Per Share:
Dilutive Securities, Shares (Denominator)	0	[1]	0	[1]	0	[2]	234	[2]
Stock Options [Member]
Diluted (Loss) Earnings Per Share:
Dilutive Securities, Shares (Denominator)	0	[1]	0	[1]	0	[2]	182	[2]

[1]   (a) Shares in thousands. * For the three months ended September 30, 2022 and 2021, respectively, convertible senior notes, stock options, and warrants were excluded due to anti-dilutive effect.  

[2] (a) Shares in thousands. * For the nine months ended September 30, 2022, convertible senior notes, stock options, and warrants were excluded due to anti-dilutive effect. For the nine months ended September 30, 2021, convertible senior notes were excluded due to anti-dilutive effect.