Condensed Financial Information of HCI Group, Inc. - Balance Sheets (Detail) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020
Assets
Cash and cash equivalents	[1]	$ 536,478	$ 234,863
Fixed-maturity securities, Estimated Fair Value		383,238	483,901
Equity securities, at fair value		45,537	34,583
Limited partnership investments		23,583	25,702
Property and equipment, net		29,251	17,910
Intangible assets, net		7,659	10,578
Right-of-use assets - operating leases		1,407	777
Income taxes receivable		0	2,807
Other assets	[1]	50,365	31,671
Total assets		1,811,316	1,803,328
Liabilities and Stockholders’ Equity
Lease liabilities - operating leases		1,408	721
Income tax payable		7,702	0
Deferred income taxes, net		0	1,704
Long-term debt		208,495	211,687
Due to related parties		35,623	23,361
Total liabilities		1,387,991	1,548,521
Total stockholders’ equity		324,843	162,596	$ 201,136
Total liabilities and stockholders' equity		1,811,316	1,803,328
HCI Group [Member]
Assets
Cash and cash equivalents		175,762	102,755
Fixed-maturity securities, Estimated Fair Value		0	34
Equity securities, at fair value		9,445	8,662
Limited partnership investments		17,517	19,446
Note receivable - related party		83,146	58,102
Investment in subsidiaries		335,934	274,785
Property and equipment, net		836	805
Right-of-use assets - operating leases		7,116	7,631
Other assets		1,691	1,515
Total assets		631,447	473,735
Liabilities and Stockholders’ Equity
Accrued expenses and other liabilities		3,039	1,618
Lease liabilities - operating leases		7,351	7,607
Income tax payable		7,180	8,427
Deferred income taxes, net		651	2
Long-term debt		191,746	191,042
Due to related parties		111,183	102,443
Total liabilities		321,150	311,139
Total stockholders’ equity		310,297	162,596
Total liabilities and stockholders' equity		$ 631,447	$ 473,735

[1] See Note 16 for details of balances associated with variable interest entity.