Commitments and Contingencies - Summary of Contractual Obligations (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]
2018	$ 21,792
2019	2,392
2020	1,196
Total	$ 25,380

Amount of contractual obligation due in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	hci_ContractualObligationDueInNextRollingTwelveMonths
Namespace Prefix:	hci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant