<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.21.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>283</ContextCount>
  <ElementCount>336</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>58</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000010 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>000020 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_StatementConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>000030 - Statement - Consolidated Balance Sheets - Parenthetical</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_StatementConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets - Parenthetical</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>000040 - Statement - Consolidated Income Statement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_StatementConsolidatedIncomeStatement</Role>
      <ShortName>Consolidated Income Statement</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>000050 - Statement - Condensed Consolidated Statement of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_StatementCondensedConsolidatedStatementOfComprehensiveIncome</Role>
      <ShortName>Condensed Consolidated Statement of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>000060 - Statement - Condensed Consolidated Statement of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_StatementCondensedConsolidatedStatementOfStockholdersEquity</Role>
      <ShortName>Condensed Consolidated Statement of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>000070 - Statement - Condensed Consolidated Statement of Stockholders' Equity - Parenthetical</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_StatementCondensedConsolidatedStatementOfStockholdersEquityParenthetical</Role>
      <ShortName>Condensed Consolidated Statement of Stockholders' Equity - Parenthetical</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>000080 - Statement - Consolidated Statement of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_StatementConsolidatedStatementOfCashFlows</Role>
      <ShortName>Consolidated Statement of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>000090 - Disclosure - Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureOrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock</Role>
      <ShortName>Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>000100 - Disclosure - Disposal Groups, Including Discontinued Operations, Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureDisposalGroupsIncludingDiscontinuedOperationsDisclosure</Role>
      <ShortName>Disposal Groups, Including Discontinued Operations, Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>000110 - Disclosure - Earnings Per Share [Text Block]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureEarningsPerShareTextBlock</Role>
      <ShortName>Earnings Per Share [Text Block]</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>000120 - Disclosure - Cash and Cash Equivalents Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureCashAndCashEquivalentsDisclosure</Role>
      <ShortName>Cash and Cash Equivalents Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>000130 - Disclosure - Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosure</Role>
      <ShortName>Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>000140 - Disclosure - Fair Value Disclosures [Text Block]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureFairValueDisclosuresTextBlock</Role>
      <ShortName>Fair Value Disclosures [Text Block]</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>000150 - Disclosure - Variable Interest Entity Disclosure [Text Block]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureVariableInterestEntityDisclosureTextBlock</Role>
      <ShortName>Variable Interest Entity Disclosure [Text Block]</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>000160 - Disclosure - Related Party Transactions Disclosure [Text Block]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureRelatedPartyTransactionsDisclosureTextBlock</Role>
      <ShortName>Related Party Transactions Disclosure [Text Block]</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>000170 - Disclosure - Business Combination Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureBusinessCombinationDisclosure</Role>
      <ShortName>Business Combination Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>000180 - Disclosure - Intangible Assets Disclosure [Text Block]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureIntangibleAssetsDisclosureTextBlock</Role>
      <ShortName>Intangible Assets Disclosure [Text Block]</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>000190 - Disclosure - Revenue from Contract with Customer</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureRevenueFromContractWithCustomer</Role>
      <ShortName>Revenue from Contract with Customer</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>000200 - Disclosure - Income Tax Disclosure [Text Block]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureIncomeTaxDisclosureTextBlock</Role>
      <ShortName>Income Tax Disclosure [Text Block]</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>000210 - Disclosure - Stockholders' Equity Note Disclosure [Text Block]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureStockholdersEquityNoteDisclosureTextBlock</Role>
      <ShortName>Stockholders' Equity Note Disclosure [Text Block]</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>000220 - Disclosure - Cash Flow, Supplemental Disclosures [Text Block]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureCashFlowSupplementalDisclosuresTextBlock</Role>
      <ShortName>Cash Flow, Supplemental Disclosures [Text Block]</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>000230 - Disclosure - Commitments and Contingencies Disclosure [Text Block]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureCommitmentsAndContingenciesDisclosureTextBlock</Role>
      <ShortName>Commitments and Contingencies Disclosure [Text Block]</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>000240 - Disclosure - Segment Reporting Disclosure [Text Block]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureSegmentReportingDisclosureTextBlock</Role>
      <ShortName>Segment Reporting Disclosure [Text Block]</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>000250 - Disclosure - Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]: Basis of Accounting, Policy [Policy Text Block] (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureOrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlockBasisOfAccountingPolicyPolicyTextBlockPolicies</Role>
      <ShortName>Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]: Basis of Accounting, Policy [Policy Text Block] (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureOrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>000260 - Disclosure - Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]: Reclassification, Policy [Policy Text Block] (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureOrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlockReclassificationPolicyPolicyTextBlockPolicies</Role>
      <ShortName>Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]: Reclassification, Policy [Policy Text Block] (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureOrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>000270 - Disclosure - Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]: New Accounting Pronouncements, Policy [Policy Text Block] (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureOrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlockNewAccountingPronouncementsPolicyPolicyTextBlockPolicies</Role>
      <ShortName>Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]: New Accounting Pronouncements, Policy [Policy Text Block] (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureOrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>000280 - Disclosure - Disposal Groups, Including Discontinued Operations, Disclosure: Disposal Groups, Including Discontinued Operations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureDisposalGroupsIncludingDiscontinuedOperationsDisclosureDisposalGroupsIncludingDiscontinuedOperationsTables</Role>
      <ShortName>Disposal Groups, Including Discontinued Operations, Disclosure: Disposal Groups, Including Discontinued Operations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>000290 - Disclosure - Earnings Per Share [Text Block]: Earnings Per Share, Schedule Of Net Income Attributable To Parent (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureEarningsPerShareTextBlockEarningsPerShareScheduleOfNetIncomeAttributableToParentTables</Role>
      <ShortName>Earnings Per Share [Text Block]: Earnings Per Share, Schedule Of Net Income Attributable To Parent (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>000300 - Disclosure - Cash and Cash Equivalents Disclosure: Schedule of Cash and Cash Equivalents (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureCashAndCashEquivalentsDisclosureScheduleOfCashAndCashEquivalentsTables</Role>
      <ShortName>Cash and Cash Equivalents Disclosure: Schedule of Cash and Cash Equivalents (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>000310 - Disclosure - Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Debt Securities, Available-for-sale [Table Text Block] (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureDebtSecuritiesAvailableForSaleTableTextBlockTables</Role>
      <ShortName>Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Debt Securities, Available-for-sale [Table Text Block] (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosure</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>000320 - Disclosure - Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Investments Classified by Contractual Maturity Date (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureInvestmentsClassifiedByContractualMaturityDateTables</Role>
      <ShortName>Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Investments Classified by Contractual Maturity Date (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosure</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>000330 - Disclosure - Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTables</Role>
      <ShortName>Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosure</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>000340 - Disclosure - Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Realized Gain (Loss) on Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureRealizedGainLossOnInvestmentsTables</Role>
      <ShortName>Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Realized Gain (Loss) on Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosure</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>000350 - Disclosure - Fair Value Disclosures [Text Block]: Fair Value, Assets Measured on Recurring Basis (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureFairValueDisclosuresTextBlockFairValueAssetsMeasuredOnRecurringBasisTables</Role>
      <ShortName>Fair Value Disclosures [Text Block]: Fair Value, Assets Measured on Recurring Basis (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>000360 - Disclosure - Fair Value Disclosures [Text Block]: Fair Value, by Balance Sheet Grouping (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureFairValueDisclosuresTextBlockFairValueByBalanceSheetGroupingTables</Role>
      <ShortName>Fair Value Disclosures [Text Block]: Fair Value, by Balance Sheet Grouping (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>000370 - Disclosure - Business Combination Disclosure: Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureBusinessCombinationDisclosureScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTables</Role>
      <ShortName>Business Combination Disclosure: Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>000380 - Disclosure - Intangible Assets Disclosure [Text Block]: Schedule of Finite-Lived Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureIntangibleAssetsDisclosureTextBlockScheduleOfFiniteLivedIntangibleAssetsTables</Role>
      <ShortName>Intangible Assets Disclosure [Text Block]: Schedule of Finite-Lived Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>000390 - Disclosure - Revenue from Contract with Customer: Disaggregation of Revenue (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureRevenueFromContractWithCustomerDisaggregationOfRevenueTables</Role>
      <ShortName>Revenue from Contract with Customer: Disaggregation of Revenue (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>000400 - Disclosure - Revenue from Contract with Customer: Contract with Customer, Contract Asset, Contract Liability, and Receivable (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureRevenueFromContractWithCustomerContractWithCustomerContractAssetContractLiabilityAndReceivableTables</Role>
      <ShortName>Revenue from Contract with Customer: Contract with Customer, Contract Asset, Contract Liability, and Receivable (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>000410 - Disclosure - Stockholders' Equity Note Disclosure [Text Block]: Schedule of Accumulated Other Comprehensive Income (Loss) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureStockholdersEquityNoteDisclosureTextBlockScheduleOfAccumulatedOtherComprehensiveIncomeLossTables</Role>
      <ShortName>Stockholders' Equity Note Disclosure [Text Block]: Schedule of Accumulated Other Comprehensive Income (Loss) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>000420 - Disclosure - Stockholders' Equity Note Disclosure [Text Block]: Reclassification out of Accumulated Other Comprehensive Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureStockholdersEquityNoteDisclosureTextBlockReclassificationOutOfAccumulatedOtherComprehensiveIncomeTables</Role>
      <ShortName>Stockholders' Equity Note Disclosure [Text Block]: Reclassification out of Accumulated Other Comprehensive Income (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>000430 - Disclosure - Segment Reporting Disclosure [Text Block]: Schedule of Segment Reporting Information, by Segment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureSegmentReportingDisclosureTextBlockScheduleOfSegmentReportingInformationBySegmentTables</Role>
      <ShortName>Segment Reporting Disclosure [Text Block]: Schedule of Segment Reporting Information, by Segment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>000440 - Disclosure - Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureOrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlockDetails</Role>
      <ShortName>Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureOrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlockBasisOfAccountingPolicyPolicyTextBlockPolicies</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>000450 - Disclosure - Disposal Groups, Including Discontinued Operations, Disclosure (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureDisposalGroupsIncludingDiscontinuedOperationsDisclosureDetails</Role>
      <ShortName>Disposal Groups, Including Discontinued Operations, Disclosure (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureDisposalGroupsIncludingDiscontinuedOperationsDisclosureDisposalGroupsIncludingDiscontinuedOperationsTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>000460 - Disclosure - Disposal Groups, Including Discontinued Operations, Disclosure: Disposal Groups, Including Discontinued Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureDisposalGroupsIncludingDiscontinuedOperationsDisclosureDisposalGroupsIncludingDiscontinuedOperationsDetails</Role>
      <ShortName>Disposal Groups, Including Discontinued Operations, Disclosure: Disposal Groups, Including Discontinued Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureDisposalGroupsIncludingDiscontinuedOperationsDisclosureDisposalGroupsIncludingDiscontinuedOperationsTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>000470 - Disclosure - Earnings Per Share [Text Block]: Earnings Per Share, Schedule Of Net Income Attributable To Parent (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureEarningsPerShareTextBlockEarningsPerShareScheduleOfNetIncomeAttributableToParentDetails</Role>
      <ShortName>Earnings Per Share [Text Block]: Earnings Per Share, Schedule Of Net Income Attributable To Parent (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureEarningsPerShareTextBlockEarningsPerShareScheduleOfNetIncomeAttributableToParentTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>000480 - Disclosure - Cash and Cash Equivalents Disclosure: Schedule of Cash and Cash Equivalents (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureCashAndCashEquivalentsDisclosureScheduleOfCashAndCashEquivalentsDetails</Role>
      <ShortName>Cash and Cash Equivalents Disclosure: Schedule of Cash and Cash Equivalents (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureCashAndCashEquivalentsDisclosureScheduleOfCashAndCashEquivalentsTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>000490 - Disclosure - Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Debt Securities, Available-for-sale [Table Text Block] (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureDebtSecuritiesAvailableForSaleTableTextBlockDetails</Role>
      <ShortName>Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Debt Securities, Available-for-sale [Table Text Block] (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureDebtSecuritiesAvailableForSaleTableTextBlockTables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>000500 - Disclosure - Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Investments Classified by Contractual Maturity Date (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureInvestmentsClassifiedByContractualMaturityDateDetails</Role>
      <ShortName>Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Investments Classified by Contractual Maturity Date (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureDebtSecuritiesAvailableForSaleTableTextBlockTables</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>000510 - Disclosure - Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueDetails</Role>
      <ShortName>Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureDebtSecuritiesAvailableForSaleTableTextBlockTables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>000520 - Disclosure - Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Realized Gain (Loss) on Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureRealizedGainLossOnInvestmentsDetails</Role>
      <ShortName>Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure: Realized Gain (Loss) on Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureDebtSecuritiesAvailableForSaleTableTextBlockTables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>000530 - Disclosure - Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureDetails</Role>
      <ShortName>Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureDebtSecuritiesAvailableForSaleTableTextBlockTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>000540 - Disclosure - Fair Value Disclosures [Text Block]: Fair Value, Assets Measured on Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureFairValueDisclosuresTextBlockFairValueAssetsMeasuredOnRecurringBasisDetails</Role>
      <ShortName>Fair Value Disclosures [Text Block]: Fair Value, Assets Measured on Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureFairValueDisclosuresTextBlockFairValueAssetsMeasuredOnRecurringBasisTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>000550 - Disclosure - Fair Value Disclosures [Text Block]: Fair Value, by Balance Sheet Grouping (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureFairValueDisclosuresTextBlockFairValueByBalanceSheetGroupingDetails</Role>
      <ShortName>Fair Value Disclosures [Text Block]: Fair Value, by Balance Sheet Grouping (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureFairValueDisclosuresTextBlockFairValueByBalanceSheetGroupingTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>000560 - Disclosure - Variable Interest Entity Disclosure [Text Block] (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureVariableInterestEntityDisclosureTextBlockDetails</Role>
      <ShortName>Variable Interest Entity Disclosure [Text Block] (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureVariableInterestEntityDisclosureTextBlock</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>000570 - Disclosure - Related Party Transactions Disclosure [Text Block] (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureRelatedPartyTransactionsDisclosureTextBlockDetails</Role>
      <ShortName>Related Party Transactions Disclosure [Text Block] (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureRelatedPartyTransactionsDisclosureTextBlock</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>000580 - Disclosure - Business Combination Disclosure (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureBusinessCombinationDisclosureDetails</Role>
      <ShortName>Business Combination Disclosure (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureBusinessCombinationDisclosureScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTables</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>000590 - Disclosure - Business Combination Disclosure: Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureBusinessCombinationDisclosureScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetails</Role>
      <ShortName>Business Combination Disclosure: Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureBusinessCombinationDisclosureScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>000600 - Disclosure - Intangible Assets Disclosure [Text Block] (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureIntangibleAssetsDisclosureTextBlockDetails</Role>
      <ShortName>Intangible Assets Disclosure [Text Block] (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureIntangibleAssetsDisclosureTextBlockScheduleOfFiniteLivedIntangibleAssetsTables</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>000610 - Disclosure - Intangible Assets Disclosure [Text Block]: Schedule of Finite-Lived Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureIntangibleAssetsDisclosureTextBlockScheduleOfFiniteLivedIntangibleAssetsDetails</Role>
      <ShortName>Intangible Assets Disclosure [Text Block]: Schedule of Finite-Lived Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureIntangibleAssetsDisclosureTextBlockScheduleOfFiniteLivedIntangibleAssetsTables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>000620 - Disclosure - Revenue from Contract with Customer: Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureRevenueFromContractWithCustomerDisaggregationOfRevenueDetails</Role>
      <ShortName>Revenue from Contract with Customer: Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureRevenueFromContractWithCustomerDisaggregationOfRevenueTables</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>000630 - Disclosure - Revenue from Contract with Customer (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureRevenueFromContractWithCustomerDetails</Role>
      <ShortName>Revenue from Contract with Customer (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureRevenueFromContractWithCustomerDisaggregationOfRevenueTables</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>000640 - Disclosure - Revenue from Contract with Customer: Contract with Customer, Contract Asset, Contract Liability, and Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureRevenueFromContractWithCustomerContractWithCustomerContractAssetContractLiabilityAndReceivableDetails</Role>
      <ShortName>Revenue from Contract with Customer: Contract with Customer, Contract Asset, Contract Liability, and Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureRevenueFromContractWithCustomerContractWithCustomerContractAssetContractLiabilityAndReceivableTables</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>000650 - Disclosure - Income Tax Disclosure [Text Block] (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureIncomeTaxDisclosureTextBlockDetails</Role>
      <ShortName>Income Tax Disclosure [Text Block] (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureIncomeTaxDisclosureTextBlock</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>000660 - Disclosure - Stockholders' Equity Note Disclosure [Text Block]: Schedule of Accumulated Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureStockholdersEquityNoteDisclosureTextBlockScheduleOfAccumulatedOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>Stockholders' Equity Note Disclosure [Text Block]: Schedule of Accumulated Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureStockholdersEquityNoteDisclosureTextBlockScheduleOfAccumulatedOtherComprehensiveIncomeLossTables</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>000670 - Disclosure - Stockholders' Equity Note Disclosure [Text Block]: Reclassification out of Accumulated Other Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureStockholdersEquityNoteDisclosureTextBlockReclassificationOutOfAccumulatedOtherComprehensiveIncomeDetails</Role>
      <ShortName>Stockholders' Equity Note Disclosure [Text Block]: Reclassification out of Accumulated Other Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureStockholdersEquityNoteDisclosureTextBlockReclassificationOutOfAccumulatedOtherComprehensiveIncomeTables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>000680 - Disclosure - Cash Flow, Supplemental Disclosures [Text Block] (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureCashFlowSupplementalDisclosuresTextBlockDetails</Role>
      <ShortName>Cash Flow, Supplemental Disclosures [Text Block] (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureCashFlowSupplementalDisclosuresTextBlock</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>000690 - Disclosure - Commitments and Contingencies Disclosure [Text Block] (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureCommitmentsAndContingenciesDisclosureTextBlockDetails</Role>
      <ShortName>Commitments and Contingencies Disclosure [Text Block] (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureCommitmentsAndContingenciesDisclosureTextBlock</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="ihc-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>000700 - Disclosure - Segment Reporting Disclosure [Text Block]: Schedule of Segment Reporting Information, by Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://Ihcgroup.com/20210930/role/idr_DisclosureSegmentReportingDisclosureTextBlockScheduleOfSegmentReportingInformationBySegmentDetails</Role>
      <ShortName>Segment Reporting Disclosure [Text Block]: Schedule of Segment Reporting Information, by Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://Ihcgroup.com/20210930/role/idr_DisclosureSegmentReportingDisclosureTextBlockScheduleOfSegmentReportingInformationBySegmentTables</ParentRole>
      <Position>70</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="ihc-20210930.htm">ihc-20210930.htm</File>
    <File>ihc-20210930.xsd</File>
    <File>ihc-20210930_cal.xml</File>
    <File>ihc-20210930_def.xml</File>
    <File>ihc-20210930_lab.xml</File>
    <File>ihc-20210930_pre.xml</File>
    <File>ihc3q2021_ex10z22.htm</File>
    <File>ihc3q2021_ex31z1.htm</File>
    <File>ihc3q2021_ex31z2.htm</File>
    <File>ihc3q2021_ex32z1.htm</File>
    <File>ihc3q2021_ex32z2.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2021</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/srt/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/us-gaap/2021-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
