Investments - Summary of Assets Held for Sale (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($)	Nov. 05, 2018 a
Assets Held-for-sale, Not Part of Disposal Group, Current [Abstract]
Decrease in depreciation expense \| $	$ 34
Area of Land \| a		10

Amount of increase (decrease) in depreciation expense of real estate investments.

No definition available.

Name:	hci_DepreciationExpenseRealEstateInvestmentIncreaseDecrease
Namespace Prefix:	hci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration