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Fair Value Disclosures: Fair Value Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote5FairValueDisclosuresFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTables 66 false false R67.htm 000670 - Disclosure - Note 5. Fair Value Disclosures: Fair Value, by Balance Sheet Grouping (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote5FairValueDisclosuresFairValueByBalanceSheetGroupingDetails Note 5. Fair Value Disclosures: Fair Value, by Balance Sheet Grouping (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote5FairValueDisclosuresFairValueByBalanceSheetGroupingTables 67 false false R68.htm 000680 - Disclosure - Note 6. Variable Interest Entities (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote6VariableInterestEntitiesDetails Note 6. 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Goodwill and Other Intangible Assets: Schedule of Indefinite-Lived Intangible Assets (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote9GoodwillAndOtherIntangibleAssetsScheduleOfIndefiniteLivedIntangibleAssetsDetails Note 9. Goodwill and Other Intangible Assets: Schedule of Indefinite-Lived Intangible Assets (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote9GoodwillAndOtherIntangibleAssetsScheduleOfIndefiniteLivedIntangibleAssetsTables 73 false false R74.htm 000740 - Disclosure - Note 10. Income Taxes (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote10IncomeTaxesDetails Note 10. Income Taxes (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote10IncomeTaxes 74 false false R75.htm 000750 - Disclosure - Note 11. Reinsurance (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote11ReinsuranceDetails Note 11. 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Stockholders' Equity: Schedule of Accumulated Other Comprehensive Income (Loss) (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote13StockholdersEquityScheduleOfAccumulatedOtherComprehensiveIncomeLossDetails Note 13. Stockholders' Equity: Schedule of Accumulated Other Comprehensive Income (Loss) (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote13StockholdersEquityScheduleOfAccumulatedOtherComprehensiveIncomeLossTables 78 false false R79.htm 000790 - Disclosure - Note 13. Stockholders' Equity: Reclassification out of Accumulated Other Comprehensive Income (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote13StockholdersEquityReclassificationOutOfAccumulatedOtherComprehensiveIncomeDetails Note 13. Stockholders' Equity: Reclassification out of Accumulated Other Comprehensive Income (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote13StockholdersEquityReclassificationOutOfAccumulatedOtherComprehensiveIncomeTables 79 false false R80.htm 000800 - Disclosure - Note 14. Share-based Compensation: Share-based Compensation, Option and Incentive Plans Policy (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote14ShareBasedCompensationShareBasedCompensationOptionAndIncentivePlansPolicyDetails Note 14. Share-based Compensation: Share-based Compensation, Option and Incentive Plans Policy (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote14ShareBasedCompensationShareBasedCompensationOptionAndIncentivePlansPolicyPolicies 80 false false R81.htm 000810 - Disclosure - Note 14. Share-based Compensation (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote14ShareBasedCompensationDetails Note 14. Share-based Compensation (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote14ShareBasedCompensationScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTables 81 false false R82.htm 000820 - Disclosure - Note 14. Share-based Compensation: Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote14ShareBasedCompensationScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanDetails Note 14. Share-based Compensation: Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote14ShareBasedCompensationScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTables 82 false false R83.htm 000830 - Disclosure - Note 14. Share-based Compensation: Schedule of Share-based Compensation, Stock Options, Activity (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote14ShareBasedCompensationScheduleOfShareBasedCompensationStockOptionsActivityDetails Note 14. Share-based Compensation: Schedule of Share-based Compensation, Stock Options, Activity (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote14ShareBasedCompensationScheduleOfShareBasedCompensationStockOptionsActivityTables 83 false false R84.htm 000840 - Disclosure - Note 14. Share-based Compensation: Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote14ShareBasedCompensationScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingDetails Note 14. Share-based Compensation: Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote14ShareBasedCompensationScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingTables 84 false false R85.htm 000850 - Disclosure - Note 14. Share-based Compensation: Schedule of Share-based Compensation, Restricted Stock Units Award Activity (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote14ShareBasedCompensationScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityDetails Note 14. Share-based Compensation: Schedule of Share-based Compensation, Restricted Stock Units Award Activity (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote14ShareBasedCompensationScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTables 85 false false R86.htm 000860 - Disclosure - Note 15. Supplemental Disclosures of Cash Flow Information (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote15SupplementalDisclosuresOfCashFlowInformationDetails Note 15. Supplemental Disclosures of Cash Flow Information (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote15SupplementalDisclosuresOfCashFlowInformation 86 false false R87.htm 000870 - Disclosure - Note 16. Segment Reporting: Schedule of Segment Reporting Information, by Segment (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote16SegmentReportingScheduleOfSegmentReportingInformationBySegmentDetails Note 16. Segment Reporting: Schedule of Segment Reporting Information, by Segment (Details) Details http://www.ihcgroup.com/20160930/role/idr_DisclosureNote16SegmentReportingScheduleOfSegmentReportingInformationBySegmentTables 87 false false R88.htm 000880 - Disclosure - Note 16. Segment Reporting (Details) Sheet http://www.ihcgroup.com/20160930/role/idr_DisclosureNote16SegmentReportingDetails Note 16. 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