| Document and Entity Information | Mar. 08, 2024 |
| Entity Information [Line Items] | |
| Document Type | POS AM |
| Amendment Flag | true |
| Amendment Description | This Post-Effective Amendment No. 1 relates to the Registration Statement on Form S-3 No. 333-274424 (the “Registration Statement”) of HCI Group, Inc., a Florida corporation (the “Registrant”), previously filed with the Securities and Exchange Commission on September 8, 2023 and declared effective on September 28, 2023, to register the offer and sale from time to time of up to a maximum aggregate offering price of $150,000,000 of the Registrant’s common stock, preferred stock, debt securities, warrants, stock purchase contracts, and stock purchase units (collectively, the “Registered Securities”). This Post-Effective Amendment No.1 is being filed to deregister any and all Registered Securities that remain unsold under the Registration Statement. |
| Entity Registrant Name | HCI Group, Inc. |
| Entity Central Index Key | 0001400810 |
| Entity Filer Category | Accelerated Filer |
| Entity Small Business | false |
| Entity Emerging Growth Company | false |
| Entity Incorporation, State or Country Code | FL |
| Entity Tax Identification Number | 20-5961396 |
| Entity Address, Address Line One | 3802 Coconut Palm Drive |
| Entity Address, City or Town | Tampa |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33619 |
| City Area Code | 813 |
| Local Phone Number | 849-9500 |
