Condensed Financial Information of HCI Group, Inc. - Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 239,458	$ 255,884
Fixed-maturity securities, available for sale, at fair value	182,723	237,484
Equity securities, at fair value	41,143	59,956
Short-term investments	66,479
Limited partnership investments, at equity	32,293	23,184
Property and equipment, net	13,338	12,465
Income tax receivable	971	16,192
Other assets	9,004	9,741
Total assets	832,863	842,264
Liabilities and Stockholders' Equity
Deferred income taxes, net	1,068	1,890
Total liabilities	651,422	648,289
Total stockholders' equity	181,441	193,975	$ 243,746	$ 237,722
Total liabilities and stockholders' equity	832,863	842,264
HCI Group [Member]
Assets
Cash and cash equivalents	42,292	53,755	$ 2,297	$ 2,282
Fixed-maturity securities, available for sale, at fair value	38,224	34,529
Equity securities, at fair value	7,299	11,283
Short-term investments	25,275
Limited partnership investments, at equity	21,711	15,232
Note receivable – related party	1,280	7,280
Investment in subsidiaries	290,469	310,779
Property and equipment, net	445	617
Income tax receivable	3,019	3,023
Other assets	1,136	1,019
Total assets	431,150	437,517
Liabilities and Stockholders' Equity
Accrued expenses and other liabilities	4,772	4,499
Deferred income taxes, net	3,594	2,511
Long-term debt	219,301	211,890
Due to related parties	22,042	24,642
Total liabilities	249,709	243,542
Total stockholders' equity	181,441	193,975
Total liabilities and stockholders' equity	$ 431,150	$ 437,517