Commitments and Contingencies - Summary of Contractual Obligations (Parenthetical) (Detail)	9 Months Ended
Sep. 30, 2018 Contract
Purchase Obligation, Fiscal Year Maturity [Abstract]
Number of multi-year flood reinsurance contracts	1

Number of reinsurance contracts, premiums of which are determined on a quarterly basis based on the premiums associated with the applicable flood total insured value in force on the last day of the preceding quarter.

No definition available.

Name:	hci_NumberOfFloodReinsuranceContracts
Namespace Prefix:	hci_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration