<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>420</ContextCount>
  <ElementCount>531</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>96</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_StatementConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100030 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_StatementConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100050 - Statement - Consolidated Statements of Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/StatementConsolidatedStatementsOfIncomeUnaudited</Role>
      <ShortName>Consolidated Statements of Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100060 - Statement - Consolidated Statements of Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncomeUnaudited</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100080 - Statement - Consolidated Statements of Stockholders' Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_StatementConsolidatedStatementsOfStockholdersEquityUnaudited</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100090 - Statement - Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_StatementConsolidatedStatementsOfStockholdersEquityUnauditedParenthetical</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100100 - Statement - Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlowsUnaudited</Role>
      <ShortName>Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100110 - Disclosure - Nature of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureNatureOfOperations</Role>
      <ShortName>Nature of Operations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100120 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100140 - Disclosure - Cash, Cash Equivalents, and Restricted Cash</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureCashCashEquivalentsAndRestrictedCash</Role>
      <ShortName>Cash, Cash Equivalents, and Restricted Cash</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>100150 - Disclosure - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestments</Role>
      <ShortName>Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>100160 - Disclosure - Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureComprehensiveIncomeLoss</Role>
      <ShortName>Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>100170 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureFairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>100180 - Disclosure - Intangible Assets, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureIntangibleAssetsNet</Role>
      <ShortName>Intangible Assets, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>100190 - Disclosure - Other Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureOtherAssets</Role>
      <ShortName>Other Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>100200 - Disclosure - Revolving Credit Facility</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureRevolvingCreditFacility</Role>
      <ShortName>Revolving Credit Facility</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>100210 - Disclosure - Long-Term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLongTermDebt</Role>
      <ShortName>Long-Term Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>100220 - Disclosure - Reinsurance</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureReinsurance</Role>
      <ShortName>Reinsurance</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>100230 - Disclosure - Losses and Loss Adjustment Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLossesAndLossAdjustmentExpenses</Role>
      <ShortName>Losses and Loss Adjustment Expenses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>100240 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureSegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>100250 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLeases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>100260 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureIncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>100270 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureEarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>100280 - Disclosure - Redeemable Noncontrolling Interest</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureRedeemableNoncontrollingInterest</Role>
      <ShortName>Redeemable Noncontrolling Interest</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>100290 - Disclosure - Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureEquity</Role>
      <ShortName>Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>100300 - Disclosure - Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensation</Role>
      <ShortName>Stock-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>100310 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>100320 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureSubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>100330 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>100340 - Disclosure - Cash, Cash Equivalents, and Restricted Cash (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureCashCashEquivalentsAndRestrictedCashTables</Role>
      <ShortName>Cash, Cash Equivalents, and Restricted Cash (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureCashCashEquivalentsAndRestrictedCash</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>100350 - Disclosure - Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsTables</Role>
      <ShortName>Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestments</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>100360 - Disclosure - Comprehensive Income (Loss) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureComprehensiveIncomeLossTables</Role>
      <ShortName>Comprehensive Income (Loss) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureComprehensiveIncomeLoss</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>100370 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureFairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureFairValueMeasurements</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>100380 - Disclosure - Intangible Assets, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureIntangibleAssetsNetTables</Role>
      <ShortName>Intangible Assets, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureIntangibleAssetsNet</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>100390 - Disclosure - Other Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureOtherAssetsTables</Role>
      <ShortName>Other Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureOtherAssets</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>100400 - Disclosure - Long-Term Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLongTermDebtTables</Role>
      <ShortName>Long-Term Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLongTermDebt</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>100410 - Disclosure - Reinsurance (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureReinsuranceTables</Role>
      <ShortName>Reinsurance (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureReinsurance</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>100420 - Disclosure - Losses and Loss Adjustment Expenses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLossesAndLossAdjustmentExpensesTables</Role>
      <ShortName>Losses and Loss Adjustment Expenses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLossesAndLossAdjustmentExpenses</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>100430 - Disclosure - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationTables</Role>
      <ShortName>Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureSegmentInformation</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>100440 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLeases</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>100450 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureEarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureEarningsPerShare</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>100460 - Disclosure - Redeemable Noncontrolling Interest (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureRedeemableNoncontrollingInterestTables</Role>
      <ShortName>Redeemable Noncontrolling Interest (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureRedeemableNoncontrollingInterest</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>100470 - Disclosure - Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationTables</Role>
      <ShortName>Stock-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensation</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>100480 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingencies</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>100490 - Disclosure - Nature of Operations - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureNatureOfOperationsAdditionalInformationDetail</Role>
      <ShortName>Nature of Operations - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>100500 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail</Role>
      <ShortName>Summary of Significant Accounting Policies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>100520 - Disclosure - Cash, Cash Equivalents, and Restricted Cash - Summary of Cash, Cash Equivalents, and Restricted Cash (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureCashCashEquivalentsAndRestrictedCashSummaryOfCashCashEquivalentsAndRestrictedCashDetail</Role>
      <ShortName>Cash, Cash Equivalents, and Restricted Cash - Summary of Cash, Cash Equivalents, and Restricted Cash (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>100530 - Disclosure - Investments - Summary of Amortized Cost, Allowance for Credit Loss, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available-for-Sale Securities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsSummaryOfAmortizedCostAllowanceForCreditLossGrossUnrealizedGainsAndLossesAndEstimatedFairValueOfAvailableForSaleSecuritiesDetail</Role>
      <ShortName>Investments - Summary of Amortized Cost, Allowance for Credit Loss, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available-for-Sale Securities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>100540 - Disclosure - Investments - Scheduled Contractual Maturities of Fixed-Maturity Securities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsScheduledContractualMaturitiesOfFixedMaturitySecuritiesDetail</Role>
      <ShortName>Investments - Scheduled Contractual Maturities of Fixed-Maturity Securities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>100550 - Disclosure - Investments - Summary of Sales of Available-for-sale Fixed-Maturity Securities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsSummaryOfSalesOfAvailableForSaleFixedMaturitySecuritiesDetail</Role>
      <ShortName>Investments - Summary of Sales of Available-for-sale Fixed-Maturity Securities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>100560 - Disclosure - Investments - Summary of Securities with Gross Unrealized Loss Positions Aggregated by Investment Category (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsSummaryOfSecuritiesWithGrossUnrealizedLossPositionsAggregatedByInvestmentCategoryDetail</Role>
      <ShortName>Investments - Summary of Securities with Gross Unrealized Loss Positions Aggregated by Investment Category (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>100570 - Disclosure - Investments (Other-than-temporary Impairment) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsOtherThanTemporaryImpairmentAdditionalInformationDetail</Role>
      <ShortName>Investments (Other-than-temporary Impairment) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>100580 - Disclosure - Investments - Summary of Allowance for Credit Losses of Available-for-Sale Securities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsSummaryOfAllowanceForCreditLossesOfAvailableForSaleSecuritiesDetail</Role>
      <ShortName>Investments - Summary of Allowance for Credit Losses of Available-for-Sale Securities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>100590 - Disclosure - Investments - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Equity Securities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsSummaryOfAmortizedCostGrossUnrealizedGainsAndLossesAndEstimatedFairValueOfEquitySecuritiesDetail</Role>
      <ShortName>Investments - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Equity Securities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>100600 - Disclosure - Investments - Summary of Unrealized Gains and Losses in Consolidated Statements of Income (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsSummaryOfUnrealizedGainsAndLossesInConsolidatedStatementsOfIncomeDetail</Role>
      <ShortName>Investments - Summary of Unrealized Gains and Losses in Consolidated Statements of Income (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>100610 - Disclosure - Investments - Summary of Proceeds Received and The Gross Realized Gains and Losses From Sales of Equity Securities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsSummaryOfProceedsReceivedAndTheGrossRealizedGainsAndLossesFromSalesOfEquitySecuritiesDetail</Role>
      <ShortName>Investments - Summary of Proceeds Received and The Gross Realized Gains and Losses From Sales of Equity Securities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>100620 - Disclosure - Investments - Schedule of Company's Investments in Limited Partnerships (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsScheduleOfCompanySInvestmentsInLimitedPartnershipsDetail</Role>
      <ShortName>Investments - Schedule of Company's Investments in Limited Partnerships (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>100630 - Disclosure - Investments - Schedule of Company's Investments in Limited Partnerships (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsScheduleOfCompanySInvestmentsInLimitedPartnershipsParentheticalDetail</Role>
      <ShortName>Investments - Schedule of Company's Investments in Limited Partnerships (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>100640 - Disclosure - Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Limited Partnerships (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsSummaryOfUnauditedFinancialInformationAndUnauditedFinancialPositionOfLimitedPartnershipsDetail</Role>
      <ShortName>Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Limited Partnerships (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>100650 - Disclosure - Investments (Limited Partnership Investments) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsLimitedPartnershipInvestmentsAdditionalInformationDetail</Role>
      <ShortName>Investments (Limited Partnership Investments) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsTables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>100660 - Disclosure - Investments (Investment in Unconsolidated Joint Venture) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsInvestmentInUnconsolidatedJointVentureAdditionalInformationDetail</Role>
      <ShortName>Investments (Investment in Unconsolidated Joint Venture) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsTables</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>100670 - Disclosure - Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Joint Venture (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsSummaryOfUnauditedFinancialInformationAndUnauditedFinancialPositionOfJointVentureDetail</Role>
      <ShortName>Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Joint Venture (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>100680 - Disclosure - Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Joint Venture (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsSummaryOfUnauditedFinancialInformationAndUnauditedFinancialPositionOfJointVentureParentheticalDetail</Role>
      <ShortName>Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Joint Venture (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>100690 - Disclosure - Investments - Summary of Real Estate Investment (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsSummaryOfRealEstateInvestmentDetail</Role>
      <ShortName>Investments - Summary of Real Estate Investment (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>100700 - Disclosure - Investments (Real Estate Investments) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsRealEstateInvestmentsAdditionalInformationDetail</Role>
      <ShortName>Investments (Real Estate Investments) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsTables</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>100710 - Disclosure - Investments - Investment Income (Loss) Summarized (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/DisclosureInvestmentsInvestmentIncomeLossSummarizedDetail</Role>
      <ShortName>Investments - Investment Income (Loss) Summarized (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>100720 - Disclosure - Investments (Investment Income (Loss) Summarized) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/DisclosureInvestmentsInvestmentIncomeLossSummarizedAdditionalInformationDetail</Role>
      <ShortName>Investments (Investment Income (Loss) Summarized) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsTables</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>100730 - Disclosure - Investments (Other Investments) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsOtherInvestmentsAdditionalInformationDetail</Role>
      <ShortName>Investments (Other Investments) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureInvestmentsTables</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>100740 - Disclosure - Comprehensive Income (Loss) - Schedule of Components of Other Comprehensive Income or Loss and Related Tax Effects Allocated to Each Component (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureComprehensiveIncomeLossScheduleOfComponentsOfOtherComprehensiveIncomeOrLossAndRelatedTaxEffectsAllocatedToEachComponentDetail</Role>
      <ShortName>Comprehensive Income (Loss) - Schedule of Components of Other Comprehensive Income or Loss and Related Tax Effects Allocated to Each Component (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureComprehensiveIncomeLossTables</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>100750 - Disclosure - Fair Value Measurements - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureFairValueMeasurementsAdditionalInformationDetail</Role>
      <ShortName>Fair Value Measurements - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>100760 - Disclosure - Fair Value Measurements - Components of Long-Term Debt and Methods Used in Estimating Fair Values (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureFairValueMeasurementsComponentsOfLongTermDebtAndMethodsUsedInEstimatingFairValuesDetail</Role>
      <ShortName>Fair Value Measurements - Components of Long-Term Debt and Methods Used in Estimating Fair Values (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>100770 - Disclosure - Fair Value Measurements - Components of Long-Term Debt and Methods Used in Estimating Fair Values (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureFairValueMeasurementsComponentsOfLongTermDebtAndMethodsUsedInEstimatingFairValuesParentheticalDetail</Role>
      <ShortName>Fair Value Measurements - Components of Long-Term Debt and Methods Used in Estimating Fair Values (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>100780 - Disclosure - Fair Value Measurements - Available-for-Sale Securities Measured at Fair Value (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureFairValueMeasurementsAvailableForSaleSecuritiesMeasuredAtFairValueDetail</Role>
      <ShortName>Fair Value Measurements - Available-for-Sale Securities Measured at Fair Value (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>100790 - Disclosure - Fair Value Measurements - Schedule of Fair Value Information for Financial Assets and Liabilities Carried on Consolidated Balance Sheets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureFairValueMeasurementsScheduleOfFairValueInformationForFinancialAssetsAndLiabilitiesCarriedOnConsolidatedBalanceSheetsDetail</Role>
      <ShortName>Fair Value Measurements - Schedule of Fair Value Information for Financial Assets and Liabilities Carried on Consolidated Balance Sheets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>100800 - Disclosure - Fair Value Measurements - Schedule of Fair Value Information for Financial Assets and Liabilities Carried on Consolidated Balance Sheets (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureFairValueMeasurementsScheduleOfFairValueInformationForFinancialAssetsAndLiabilitiesCarriedOnConsolidatedBalanceSheetsParentheticalDetail</Role>
      <ShortName>Fair Value Measurements - Schedule of Fair Value Information for Financial Assets and Liabilities Carried on Consolidated Balance Sheets (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>100810 - Disclosure - Intangible Assets, Net - Details of Intangible Assets, Net (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureIntangibleAssetsNetDetailsOfIntangibleAssetsNetDetail</Role>
      <ShortName>Intangible Assets, Net - Details of Intangible Assets, Net (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>100820 - Disclosure - Intangible Assets, Net - Details of Intangible Assets, Net (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/DisclosureIntangibleAssetsNetDetailsOfIntangibleAssetsNetParentheticalDetail</Role>
      <ShortName>Intangible Assets, Net - Details of Intangible Assets, Net (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>100830 - Disclosure - Intangible Assets, Net - Schedule of Remaining Weighted-Average Amortization Period for Intangible Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureIntangibleAssetsNetScheduleOfRemainingWeightedAverageAmortizationPeriodForIntangibleAssetsDetail</Role>
      <ShortName>Intangible Assets, Net - Schedule of Remaining Weighted-Average Amortization Period for Intangible Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>100840 - Disclosure - Intangible Assets, Net - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureIntangibleAssetsNetAdditionalInformationDetail</Role>
      <ShortName>Intangible Assets, Net - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>100850 - Disclosure - Other Assets - Summary of Other Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureOtherAssetsSummaryOfOtherAssetsDetail</Role>
      <ShortName>Other Assets - Summary of Other Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>100870 - Disclosure - Revolving Credit Facility - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureRevolvingCreditFacilityAdditionalInformationDetail</Role>
      <ShortName>Revolving Credit Facility - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>100880 - Disclosure - Long-Term Debt - Summary of Long-Term Debt (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLongTermDebtSummaryOfLongTermDebtDetail</Role>
      <ShortName>Long-Term Debt - Summary of Long-Term Debt (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>100890 - Disclosure - Long-Term Debt - Summary of Long-Term Debt (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLongTermDebtSummaryOfLongTermDebtParentheticalDetail</Role>
      <ShortName>Long-Term Debt - Summary of Long-Term Debt (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>100900 - Disclosure - Long-Term Debt (Convertible Senior Notes) - Additional Information (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLongTermDebtConvertibleSeniorNotesAdditionalInformationDetail</Role>
      <ShortName>Long-Term Debt (Convertible Senior Notes) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLongTermDebtTables</ParentRole>
      <Position>85</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>100910 - Disclosure - Long-Term Debt - Summary of Future Maturities of Long-Term Debt (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLongTermDebtSummaryOfFutureMaturitiesOfLongTermDebtDetail</Role>
      <ShortName>Long-Term Debt - Summary of Future Maturities of Long-Term Debt (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>100920 - Disclosure - Long-Term Debt - Schedule of Interest Expense Related to Long-Term Debt (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLongTermDebtScheduleOfInterestExpenseRelatedToLongTermDebtDetail</Role>
      <ShortName>Long-Term Debt - Schedule of Interest Expense Related to Long-Term Debt (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>100930 - Disclosure - Reinsurance - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureReinsuranceAdditionalInformationDetail</Role>
      <ShortName>Reinsurance - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>100940 - Disclosure - Reinsurance - Impact of the Reinsurance Contracts on Premiums Written and Earned (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureReinsuranceImpactOfReinsuranceContractsOnPremiumsWrittenAndEarnedDetail</Role>
      <ShortName>Reinsurance - Impact of the Reinsurance Contracts on Premiums Written and Earned (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>100950 - Disclosure - Losses and Loss Adjustment Expenses - Losses and LAE (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLossesAndLossAdjustmentExpensesLossesAndLAEDetail</Role>
      <ShortName>Losses and Loss Adjustment Expenses - Losses and LAE (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>100960 - Disclosure - Losses and Loss Adjustment Expenses - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLossesAndLossAdjustmentExpensesAdditionalInformationDetail</Role>
      <ShortName>Losses and Loss Adjustment Expenses - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>100970 - Disclosure - Segment Information - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationAdditionalInformationDetail</Role>
      <ShortName>Segment Information - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>100980 - Disclosure - Segment Information - Summary of Segment Information Reconciled to Consolidated Statements of Income (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationSummaryOfSegmentInformationReconciledToConsolidatedStatementsOfIncomeDetail</Role>
      <ShortName>Segment Information - Summary of Segment Information Reconciled to Consolidated Statements of Income (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>100990 - Disclosure - Segment Information - Summary of Segment Information Reconciled to Consolidated Statements of Income (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationSummaryOfSegmentInformationReconciledToConsolidatedStatementsOfIncomeParentheticalDetail</Role>
      <ShortName>Segment Information - Summary of Segment Information Reconciled to Consolidated Statements of Income (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>101000 - Disclosure - Segment Information - Summary of Segment Assets Reconciled to Consolidated Balance Sheet (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationSummaryOfSegmentAssetsReconciledToConsolidatedBalanceSheetDetail</Role>
      <ShortName>Segment Information - Summary of Segment Assets Reconciled to Consolidated Balance Sheet (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>101010 - Disclosure - Leases - Summarizes of Right-of-use Assets and Liabilities for Operating and Finance Leases (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLeasesSummarizesOfRightOfUseAssetsAndLiabilitiesForOperatingAndFinanceLeasesDetail</Role>
      <ShortName>Leases - Summarizes of Right-of-use Assets and Liabilities for Operating and Finance Leases (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>101020 - Disclosure - Leases - Summarizes the Company's operating and finance leases in which the Company (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLeasesSummarizesCompanySOperatingAndFinanceLeasesInWhichCompanyDetail</Role>
      <ShortName>Leases - Summarizes the Company's operating and finance leases in which the Company (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>101030 - Disclosure - Leases - Maturities of lease liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLeasesMaturitiesOfLeaseLiabilitiesDetail</Role>
      <ShortName>Leases - Maturities of lease liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>101040 - Disclosure - Leases -The Company's operating and finance leases (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLeasesTheCompanySOperatingAndFinanceLeasesDetail</Role>
      <ShortName>Leases -The Company's operating and finance leases (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>101050 - Disclosure - Leases - Summarizes the Company's operating leases (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureLeasesSummarizesCompanySOperatingLeasesDetail</Role>
      <ShortName>Leases - Summarizes the Company's operating leases (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>101060 - Disclosure - Income Taxes - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetail</Role>
      <ShortName>Income Taxes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>101070 - Disclosure - Earnings Per Share - Summary of Numerator and Denominator of Basic and Fully Diluted Earnings Per Common Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureEarningsPerShareSummaryOfNumeratorAndDenominatorOfBasicAndFullyDilutedEarningsPerCommonShareDetail</Role>
      <ShortName>Earnings Per Share - Summary of Numerator and Denominator of Basic and Fully Diluted Earnings Per Common Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>101080 - Disclosure - Redeemable Noncontrolling Interest - Summary of Activity of Redeemable Noncontrolling Interest (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureRedeemableNoncontrollingInterestSummaryOfActivityOfRedeemableNoncontrollingInterestDetail</Role>
      <ShortName>Redeemable Noncontrolling Interest - Summary of Activity of Redeemable Noncontrolling Interest (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>101090 - Disclosure - Redeemable Noncontrolling Interest - Summary of Activity of Redeemable Noncontrolling Interest (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureRedeemableNoncontrollingInterestSummaryOfActivityOfRedeemableNoncontrollingInterestParentheticalDetail</Role>
      <ShortName>Redeemable Noncontrolling Interest - Summary of Activity of Redeemable Noncontrolling Interest (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>104</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>101100 - Disclosure - Redeemable Noncontrolling Interest - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureRedeemableNoncontrollingInterestAdditionalInformationDetail</Role>
      <ShortName>Redeemable Noncontrolling Interest - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>101110 - Disclosure - Equity (Common Stock) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureEquityCommonStockAdditionalInformationDetail</Role>
      <ShortName>Equity (Common Stock) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureEquity</ParentRole>
      <Position>106</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>101120 - Disclosure - Equity (Warrants) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureEquityWarrantsAdditionalInformationDetail</Role>
      <ShortName>Equity (Warrants) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureEquity</ParentRole>
      <Position>107</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>101130 - Disclosure - Equity (Noncontrolling Interest) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureEquityNoncontrollingInterestAdditionalInformationDetail</Role>
      <ShortName>Equity (Noncontrolling Interest) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureEquity</ParentRole>
      <Position>108</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>101140 - Disclosure - Stock-Based Compensation (2012 Omnibus Incentive Plan) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensation2012OmnibusIncentivePlanAdditionalInformationDetail</Role>
      <ShortName>Stock-Based Compensation (2012 Omnibus Incentive Plan) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationTables</ParentRole>
      <Position>109</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>101150 - Disclosure - Stock-Based Compensation (Stock Options) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationStockOptionsAdditionalInformationDetail</Role>
      <ShortName>Stock-Based Compensation (Stock Options) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationTables</ParentRole>
      <Position>110</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>101160 - Disclosure - Stock-Based Compensation - Summary of Company's Stock Option Plan Activity (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationSummaryOfCompanySStockOptionPlanActivityDetail</Role>
      <ShortName>Stock-Based Compensation - Summary of Company's Stock Option Plan Activity (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>111</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>101180 - Disclosure - Stock Based Compensation - Information with Respect to Unvested Restricted Stock Awards Stock Option and Incentive Plan (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationInformationWithRespectToUnvestedRestrictedStockAwardsStockOptionAndIncentivePlanDetail</Role>
      <ShortName>Stock Based Compensation - Information with Respect to Unvested Restricted Stock Awards Stock Option and Incentive Plan (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>112</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>101190 - Disclosure - Stock-Based Compensation (Restricted Stock Awards) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationRestrictedStockAwardsAdditionalInformationDetail</Role>
      <ShortName>Stock-Based Compensation (Restricted Stock Awards) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationTables</ParentRole>
      <Position>113</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>101200 - Disclosure - Stock-Based Compensation - Information about Deferred Tax Benefits Recognized Related to Restricted Stock Awards, Paid Dividends and the Fair Value of Vested Restricted Stock (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationInformationAboutDeferredTaxBenefitsRecognizedRelatedToRestrictedStockAwardsPaidDividendsAndFairValueOfVestedRestrictedStockDetail</Role>
      <ShortName>Stock-Based Compensation - Information about Deferred Tax Benefits Recognized Related to Restricted Stock Awards, Paid Dividends and the Fair Value of Vested Restricted Stock (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>101210 - Disclosure - Stock-Based Compensation (Subsidiary Equity Plan) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationSubsidiaryEquityPlanAdditionalInformationDetail</Role>
      <ShortName>Stock-Based Compensation (Subsidiary Equity Plan) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationTables</ParentRole>
      <Position>115</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>101220 - Disclosure - Commitments and Contingencies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetail</Role>
      <ShortName>Commitments and Contingencies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>116</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R117.htm</HtmlFileName>
      <LongName>101230 - Disclosure - Commitments and Contingencies - Schedule of Future Minimum Aggregate Premium Amounts Payable to Reinsurer (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesScheduleOfFutureMinimumAggregatePremiumAmountsPayableToReinsurerDetail</Role>
      <ShortName>Commitments and Contingencies - Schedule of Future Minimum Aggregate Premium Amounts Payable to Reinsurer (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>117</Position>
    </Report>
    <Report instance="hci-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R118.htm</HtmlFileName>
      <LongName>101240 - Disclosure - Subsequent Events - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hcigroup.com/20220630/taxonomy/role/Role_DisclosureSubsequentEventsAdditionalInformationDetail</Role>
      <ShortName>Subsequent Events - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>118</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" original="hci-20220630.htm">hci-20220630.htm</File>
    <File>hci-20220630.xsd</File>
    <File>hci-20220630_cal.xml</File>
    <File>hci-20220630_def.xml</File>
    <File>hci-20220630_lab.xml</File>
    <File>hci-20220630_pre.xml</File>
    <File>hci-ex10_129.htm</File>
    <File>hci-ex10_131.htm</File>
    <File>hci-ex10_132.htm</File>
    <File>hci-ex10_133.htm</File>
    <File>hci-ex10_134.htm</File>
    <File>hci-ex10_135.htm</File>
    <File>hci-ex10_136.htm</File>
    <File>hci-ex10_137.htm</File>
    <File>hci-ex10_138.htm</File>
    <File>hci-ex10_139.htm</File>
    <File>hci-ex10_140.htm</File>
    <File>hci-ex10_141.htm</File>
    <File>hci-ex10_142.htm</File>
    <File>hci-ex10_143.htm</File>
    <File>hci-ex10_144.htm</File>
    <File>hci-ex10_145.htm</File>
    <File>hci-ex10_146.htm</File>
    <File>hci-ex10_147.htm</File>
    <File>hci-ex31_1.htm</File>
    <File>hci-ex31_2.htm</File>
    <File>hci-ex32_1.htm</File>
    <File>hci-ex32_2.htm</File>
    <File>hci-ex4_3.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy items="1670">http://fasb.org/us-gaap/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy items="29">http://xbrl.sec.gov/dei/2021q4</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
