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, 2024	Jun. 30, 2023	Jun. 30, 2024		Jun. 30, 2023
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income		$ 57,099	$ 14,882	$ 114,055		$ 32,675
Less: Net income attributable to redeemable noncontrolling interest		0	(2,337)	(10,149)		(4,661)
Less: Net income attributable to noncontrolling interests		(3,023)	(102)	(2,219)		(233)
Net income attributable to HCI		54,076	12,443	101,687		27,781
Less: Income attributable to participating securities		(2,052)	(427)	(3,243)		(985)
Basic Earnings Per Share:
Income allocated to common stockholders (Numerator)		$ 52,024	$ 12,016	$ 98,444		$ 26,796
Income allocated to common stockholders, Shares (Denominator)	[1]	10,041	8,302	9,897		8,290
Basic earnings per share		$ 5.18	$ 1.45	$ 9.95		$ 3.23
Diluted Earnings Per Share:
(Loss) income available to common stockholders and assumed conversions, Income (Numerator)		$ 53,777	$ 13,940	$ 101,837		$ 30,640
Income available to common stockholders and assumed conversions (Denominator)	[1]	12,696	10,921	12,661		10,886
Diluted earnings per share		$ 4.24	$ 1.28	$ 8.04		$ 2.81
Warrant [Member]
Diluted Earnings Per Share:
Dilutive Securities, Shares (Denominator)	[1]	215	7	262
Convertible Senior Notes [Member]
Diluted Earnings Per Share:
Convertible senior notes (Numerator)		$ 1,753	$ 1,924	$ 3,393	[1]	$ 3,844	[1]
Dilutive Securities, Shares (Denominator)	[1]	2,142	2,538	2,212		2,538
Stock Options [Member]
Diluted Earnings Per Share:
Dilutive Securities, Shares (Denominator)	[1]	298	74	290		58

[1] For the six months ended June 30, 2023, warrants were excluded due to anti-dilutive effect.