Earnings Per Share - Summary of Numerator and Denominator of Basic and Fully Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021		Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net (loss) income	$ (8,542)	$ 3,830		$ (5,751)	$ 10,675
Less: Net income attributable to redeemable noncontrolling interest	(2,268)	(2,179)		(4,516)	(2,973)
Less: TypTap Group's net loss attributable to non-HCI common stockholders and TypTap Group's participating securities	829	429		1,189	501
Net (loss) income attributable to HCI	(9,981)	2,080		(9,078)	8,203
Less: Loss (income) attributable to participating securities	635	(168)		590	(569)
Basic (Loss) Earnings Per Share:
(Loss) income allocated to common stockholders (Numerator)	$ (9,346)	$ 1,912		$ (8,488)	$ 7,634
(Loss) Income allocated to common stockholders, Shares (Denominator)	9,022	7,526		9,249	7,500
(Loss) Income allocated to common stockholders, Per Share Amount	$ (1.04)	$ 0.25		$ (0.92)	$ 1.02
Diluted Earnings Per Share:
(Loss) income available to common stockholders and assumed conversions, Income (Numerator)	$ (9,346)	$ 1,912		$ (8,488)	$ 7,634
(Loss) income available to common stockholders and assumed conversions, Shares (Denominator)	9,022	7,948		9,249	7,802
(Loss) income available to common stockholders and assumed conversions, Per Share Amount	$ (1.04)	$ 0.24		$ (0.92)	$ 0.98
Warrant [Member]
Diluted (Loss) Earnings Per Share:
Dilutive Securities, Shares (Denominator)		247	[1]		161	[2]
Stock Options [Member]
Diluted (Loss) Earnings Per Share:
Dilutive Securities, Shares (Denominator)		175	[1]		141	[2]

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

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