Adjustments to reconcile net income to net cash (used in) provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Statistical Measurement [Domain] Statistical Measurement [Domain] Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Other Other Claims Payable Other Claims Payable Cover [Abstract] Cover [Abstract] Net (decrease) increase in cash, cash equivalents, and restricted cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Issued and outstanding capital stock acquisition, percentage Business Acquisition, Percentage of Voting Interests Acquired Trading Symbol Trading Symbol Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] All Trading Arrangements All Trading Arrangements [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Non-NEOs Non-NEOs [Member] Schedule of Denominators for The Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Florida Agency for Healthcare Administration Florida Agency for Healthcare Administration [Member] Florida Agency for Healthcare Administration Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Risk adjustment receivable Affordable Care Act, Premium Stabilization Program, Risk Adjustment, Receivable Affordable Care Act, Premium Stabilization Program, Risk Adjustment, Receivable Amounts due government agencies Medical Premium Liability Due To Agency Medical Premium Liability Due to Agency Pay vs Performance Disclosure [Line Items] Medical claims and benefits payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Medical Claims And Benefits Payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Medical Claims And Benefits Payable Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Organization and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Goodwill, and intangible assets, net Intangible Assets, Net (Including Goodwill) Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Fair Value Measurements Fair Value Disclosures [Text Block] Award Timing Disclosures [Line Items] Other Performance Measure, Amount Other Performance Measure, Amount Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Proceeds from sales and maturities of investments Proceeds from Sale and Maturity of Marketable Securities Gross realized investment losses Debt Securities, Available-for-Sale, Realized Loss Deferred revenue Contract with Customer, Liability, Current Other assets Other Assets, Noncurrent Entity Tax Identification Number Entity Tax Identification Number Liability for Claims and Claims Adjustment Expense [Table] Liability for Claims and Claims Adjustment Expense [Table] Schedule of Long Term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Operating segments Operating Segments [Member] Receivable Type [Axis] Receivable Type [Axis] Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Operating Activities Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Other Other Cost and Expense, Operating Structured Securities Structured Securities [Member] Structured Securities [Member] Equity Components [Axis] Equity Components [Axis] Award Timing Method Award Timing Method [Text Block] Renewal term Health Plan, Extension Option, Period Health Plan, Extension Option, Period Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Trade name Trade Names [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Insider Trading Policies and Procedures [Line Items] Use of Estimates Use of Estimates, Policy [Policy Text Block] Total operating expenses Less: other operating expenses Costs and Expenses Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Receivable [Domain] Receivable [Domain] Adjustment to Compensation, Amount Adjustment to Compensation Amount Additional paid-in capital Additional Paid in Capital, Common Stock Compensation Amount Outstanding Recovery Compensation Amount Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Entity Small Business Entity Small Business Company Selected Measure Amount Company Selected Measure Amount Geographical [Axis] Geographical [Axis] Tabular List, Table Tabular List [Table Text Block] (Level 3) Fair Value, Inputs, Level 3 [Member] Receivables Total receivables Receivables, Net, Current Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Other long-term assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Potentially dilutive common shares (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Credit Facility [Domain] Credit Facility [Domain] Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period Cash, cash equivalents, and restricted cash and cash equivalents at end of period Total cash, cash equivalents, and restricted cash and cash equivalents presented in the consolidated statements of cash flows Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Medical claims and benefits payable Total Medical claims and benefits payable, beginning balance Medical claims and benefits payable, ending balance Liability for Claims and Claims Adjustment Expense Amounts Due To Government Agencies, Medicaid Program [Abstract] Amounts Due To Government Agencies, Medicaid Program [Abstract] Amounts Due To Government Agencies, Medicaid Program [Abstract] Schedule Of Premium Revenue By Health Plan Type [Table] Schedule of Premium Revenue by Health Plan Type [Table] Schedule of premium revenue by health plan type. Current assets: Assets, Current [Abstract] Goodwill Goodwill Consolidation Items [Axis] Consolidation Items [Axis] Consolidation and Interim Financial Information Consolidation And Interim Financial Information, Policy [Policy Text Block] Consolidation And Interim Financial Information, Policy [Policy Text Block] Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table] Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Number of states with programs Number Of States With Government-Sponsored Healthcare Programs Number Of States With Government-Sponsored Healthcare Programs Employee Stock Option Share-Based Payment Arrangement, Option [Member] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Prior period claims, favorable development Prior years Prior Year Claims and Claims Adjustment Expense Investments Marketable Securities, Current Other, net Proceeds from (Payments for) Other Financing Activities Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Security Exchange Name Security Exchange Name Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Schedule of Contractual Maturities of Investments Investments Classified by Contractual Maturity Date [Table Text Block] Unrealized investment gain (loss) OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Award Type Award Type [Axis] Corporate debt securities Corporate Debt Securities [Member] VIRGINIA VIRGINIA Nebraska Department of Health and Human Services Nebraska Department of Health and Human Services [Member] Nebraska Department of Health and Human Services Total liabilities Liabilities Number of members eligible for the health care programs, approximately Number Of Members Eligible For Government-Sponsored Healthcare Programs Number of members eligible for the health care programs. Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Weighted-average amortization period Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Credit Facility Revolving Credit Facility [Member] Average maturity period (less than) Investments, Average Maturity Period Investments, Average Maturity Period Expiration Date Trading Arrangement Expiration Date Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Percent due to medicare, medical loss ratio of marketplace Percent Due To Government Agencies, Medicare, Medical Loss Ratio Of Marketplace Percent Due To Government Agencies, Medicare, Medical Loss Ratio Of Marketplace WISCONSIN WISCONSIN Total Shareholder Return Amount Total Shareholder Return Amount Deferred debt issuance costs Debt Issuance Costs, Noncurrent, Net Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Income taxes Increase (Decrease) in Income Taxes Payable Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Number of service regions contract awarded Contract Award, Number Of Service Regions Contract Award, Number Of Service Regions Gross realized investment gains Debt Securities, Available-for-Sale, Realized Gain Contract term Health Plan, Contract Term Health Plan, Contract Term Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Percent due to medicare, medical loss ratio Percent Due To Government Agencies, Medicare, Medical Loss Ratio And Profit Sharing, Threshold Percent Due To Government Agencies, Marketplace, Medical Loss Ratio And Profit Sharing, Threshold Debt Instrument [Line Items] Debt Instrument [Line Items] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Medicare Medicare [Member] Medicare Common stock, shares authorized (in shares) Common Stock, Shares Authorized Government receivables Government Receivables [Member] Government Receivables [Member] Net cash paid in business combinations Cash Payments to Acquire Businesses, Net of Cash Acquired Denominator for diluted net income per share (in shares) Weighted Average Number of Shares Outstanding, Diluted Other comprehensive (loss) gain: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Numerator: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Total stockholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Interest expense Interest Expense, Nonoperating Health Plans Health Plans [Member] Health plans. Other comprehensive (loss) gain, net of tax Other comprehensive income (loss), net Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Fair value, recurring Fair Value, Recurring [Member] In a Continuous Loss Position for 12 Months or More, Estimated Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Schedule of Premium Revenue by Health Plan Type [Line Items] Schedule of Premium Revenue by Health Plan Type [Line Items] Schedule of premium revenue by health plan type. Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Document Fiscal Period Focus Document Fiscal Period Focus All Executive Categories All Executive Categories [Member] Stock-based compensation (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements 3.875% Notes due 2030 3.875% Senior Notes Due 2030 [Member] 3.875% Senior Notes Due 2030 4.375% Notes due 2028 4.375% Senior Notes Due 2028 [Member] 4.375% Senior Notes Due 2028 Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] ASSETS Assets [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Document Type Document Type Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Schedule of Operating Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Purchases of investments Payments to Acquire Marketable Securities Maximum Maximum [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Schedule of Liability for Unpaid Claims and Claims Adjustment Expense Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Accounting Policies [Abstract] Accounting Policies [Abstract] Revenue: Revenues [Abstract] Business Combinations Business Combination Disclosure [Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Statistical Measurement [Axis] Statistical Measurement [Axis] PEO Name PEO Name Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest All Award Types Award Type [Domain] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Name Outstanding Recovery, Individual Name Share-based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Fair value of net assets acquired Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Deferred income taxes, net Deferred Income Tax Assets, Net Non-PEO NEO Non-PEO NEO [Member] Intangible asset useful life Finite-Lived Intangible Asset, Useful Life Fair value of contingent consideration Contingent Consideration Classified as Equity, Fair Value Disclosure Additional Paid-in Capital Additional Paid-in Capital [Member] Finance lease liabilities Finance Lease, Liability, Noncurrent ConnectiCare ConnectiCare Holding Company [Member] ConnectiCare Holding Company Schedule of Receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Award Timing Predetermined Award Timing Predetermined [Flag] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Debt Long-Term Debt [Text Block] Net income per share - Diluted (in dollars per share) Earnings Per Share, Diluted Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Michigan Department of Health and Human Services Michigan Department of Health and Human Services [Member] Michigan Department of Health and Human Services Counterparty Name [Domain] Counterparty Name [Domain] Premium Revenue Recognition and Amounts Due Government Agencies and Risk Adjustment and Premium Deficiency Reserve on Loss Contracts Revenue from Contract with Customer [Policy Text Block] Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Claims incurred but not paid (“IBNP”) Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Paid (IBNP), Fee-for-service Claims, Amount Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Paid (IBNP), Fee-for-service Claims, Amount Deferred revenue Increase (Decrease) in Contract with Customer, Liability Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Sale of debt securities, available-for-sale Proceeds from Sale of Debt Securities, Available-for-Sale Wisconsin Department of Health Services Wisconsin Department of Health Services [Member] Wisconsin Department of Health Services Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Schedule of Fair Value Measurements of Senior Notes Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Asset-backed securities Asset-Backed Securities [Member] DOM Mississippi Division of Medicaid [Member] Mississippi Division of Medicaid Receivables Increase (Decrease) in Receivables Share-based compensation Share-Based Payment Arrangement, Noncash Expense Medical Claims and Benefits Payable Medical Claims And Benefits Payable [Text Block] Medical claims and benefits payable. Income tax expense Income Tax Expense (Benefit) Debt instrument, interest rate, stated percentage Percentage of contractual interest rate on notes Debt Instrument, Interest Rate, Stated Percentage Components of medical care costs related to: Components Of Medical Care Costs [Abstract] Components of medical care costs. Medical premiums liability, medical care costs threshold Medical Premiums Liability, Medical Care Costs Threshold Medical Premiums Liability, Medical Care Costs Threshold Provider network Provider Network [Member] Provider Network Less: interest expense Nonoperating Income (Expense) Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Other Other Receivables [Member] Other Receivables [Member] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Operating income Operating Income (Loss) Medicaid Medicaid [Member] Medicaid Number of reportable segments Number of Reportable Segments Total liabilities and stockholders’ equity Liabilities and Equity Other, net Other Operating Activities, Cash Flow Statement Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] All Adjustments to Compensation All Adjustments to Compensation [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Amortized cost, due one year through five years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Net income per share: Earnings Per Share, Basic and Diluted EPS [Abstract] Earnings Per Share, Basic and Diluted EPS Amortized cost, due in one year or less Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Underlying Security Market Price Change Underlying Security Market Price Change, Percent Individual: Individual [Axis] Common stock, $0.001 par value, 150 million shares authorized; outstanding: 59 million shares at June 30, 2024 and $58 million at December 31, 2023 Common Stock, Value, Outstanding Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Consideration transferred Contingent consideration Business Combination, Consideration Transferred, Liabilities Incurred Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity Address, State or Province Entity Address, State or Province Statement [Line Items] Statement [Line Items] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Restricted investments Restricted Investments, Noncurrent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Financial Instruments [Domain] Financial Instruments [Domain] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Purchase price Fair value of net assets acquired Business Combination, Consideration Transferred LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Minimum Minimum [Member] Restatement Determination Date Restatement Determination Date Fair Value Estimate of Fair Value Measurement [Member] Investment income Net Investment Income Adoption Date Trading Arrangement Adoption Date Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Schedule of Investments Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Due after five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 New Mexico Health Care Authority New Mexico Health Care Authority [Member] New Mexico Health Care Authority Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Segments [Axis] Segments [Axis] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Exercise Price Award Exercise Price Net Income Per Share Earnings Per Share [Text Block] Arrangement Duration Trading Arrangement Duration Subsequent Event Subsequent Event [Member] Operating expenses: Costs and Expenses [Abstract] Stockholders’ equity: Equity, Attributable to Parent [Abstract] In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Income Taxes Income Tax, Policy [Policy Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Segments [Domain] Segments [Domain] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Debt term Debt Instrument, Term All Individuals All Individuals [Member] PEO PEO [Member] Fair value of debt Debt Instrument, Fair Value Disclosure Name Trading Arrangement, Individual Name Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Maturity period (less than) Investments, Maturity Period Investments, Maturity Period Liability for Claims and Claims Adjustment Expense [Line Items] Liability for Claims and Claims Adjustment Expense [Line Items] Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Acquisition costs Business Acquisition, Transaction Costs Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Amortized cost, due after five years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 Payments for medical care costs related to: Payments For Medical Care Costs [Abstract] Payments for medical care costs. Amounts due government agencies Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Amounts Due Government Agencies Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Amounts Due Government Agencies Accounts payable, accrued liabilities and other Accounts Payable and Accrued Liabilities, Current Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Local Phone Number Local Phone Number Liabilities assumed: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Non-risk provider payables Non-Risk Provider Payable Non-Risk Provider Payable Capitation payable Capitation Claims Payable Capitation Claims Payable Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Shares outstanding at the beginning of the period (in shares) Shares, Outstanding, Excluding Restricted Stock Awards Shares, Outstanding, Excluding Restricted Stock Awards PEO Total Compensation Amount PEO Total Compensation Amount Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Debt securities, available-for-sale Estimated Fair Value Debt Securities, Available-for-Sale, Excluding Accrued Interest Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Sale and maturity of debt securities, available-for-sale Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Common Stock Common Stock [Member] Measure: Measure [Axis] Share-based compensation Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Non-current portion of long-term debt Long-Term Debt, Noncurrent, Net Of Unamortized Debt Discount Long-Term Debt, Noncurrent, Net Of Unamortized Debt Discount Bright Health Medicare Bright Health Medicare [Member] Bright Health Medicare DMAS Virginia Department of Medical Assistance Service [Member] Virginia Department of Medical Assistance Service Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Amounts due to government agencies, risk adjustment and part d risk sharing Amounts Due to Government Agencies, Risk Adjustment and Part D risk sharing Amounts Due to Government Agencies, Risk Adjustment and Part D risk sharing Line of Credit Line of Credit [Member] In a Continuous Loss Position for 12 Months or More, Total Number of Positions Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Entity Emerging Growth Company Entity Emerging Growth Company Segment Reporting [Abstract] Segment Reporting [Abstract] Entity Central Index Key Entity Central Index Key Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Total medical care costs Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Accounts payable, accrued liabilities and other Increase (Decrease) in Accounts Payable and Accrued Liabilities Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Equity Component [Domain] Equity Component [Domain] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Financial Instrument [Axis] Financial Instrument [Axis] Segments Segment Reporting Disclosure [Text Block] Medical claims and benefits payable Increase (Decrease) in Health Care Insurance Liabilities Other revenue Interest and Dividend Income, Operating Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Amounts due to medicare Amounts Due To Government Agencies, Medicare, Medical Loss Ratio And Profit Sharing, Threshold Amounts Due To Government Agencies, Medicare, Medical Loss Ratio And Profit Sharing, Threshold Entity Shell Company Entity Shell Company Change in non-risk and other payables Medical Claims And Benefits Payable, Adjustments, Change In Provider Medical Claims and Benefits Payable, Adjustments, Change in Provider Measurement Basis [Axis] Measurement Basis [Axis] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Title Trading Arrangement, Individual Title Statement [Table] Statement [Table] Measurement Frequency [Domain] Measurement Frequency [Domain] Counterparty Name [Axis] Counterparty Name [Axis] Significant Accounting Policies Significant Accounting Policies [Text Block] Consolidation Items [Domain] Consolidation Items [Domain] City Area Code City Area Code Current liabilities: Liabilities, Current [Abstract] 3.875% Notes due 2032 3.875% Senior Notes Due 2032 [Member] 3.875% Senior Notes Due 2032 Contingent consideration liabilities Business Combination, Contingent Consideration, Liability Amounts due government agencies Increase (Decrease) In Medical Premium Liability Due To Agency Increase (Decrease) in Medical Premium Liability Due to Agency Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination, Separately Recognized Transactions [Table] Business Combination, Separately Recognized Transactions [Table] (Level 1) Fair Value, Inputs, Level 1 [Member] Total current assets Assets, Current Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Senior Notes Senior Notes [Member] Pharmacy payable Pharmacy Claims Payable Pharmacy Claims Payable Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Schedule of Components of The Change in Medical Claims and Benefits Payable Components Of Change In Medical Claims And Benefits Payable [Table Text Block] Components Of Change In Medical Claims And Benefits Payable [Table Text Block] Long-term debt Total Long-Term Debt, Excluding Current Maturities Receivables Receivable [Policy Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Risk adjustment, net receivable Affordable Care Act, Premium Stabilization Program, Risk Adjustment, Net Receivable Affordable Care Act, Premium Stabilization Program, Risk Adjustment, Net Receivable Due after five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Subsequent Event Type [Axis] Subsequent Event Type [Axis] Total paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid FLORIDA FLORIDA Earnings Per Share [Abstract] Earnings Per Share [Abstract] Current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Estimated Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Retained earnings Retained Earnings (Accumulated Deficit) Premium tax revenue Health Care Organization, Premium Tax Revenue Health Care Organization, Premium Tax Revenue Contract rights - member list Contractual Rights [Member] General and administrative expenses General and Administrative Expense Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Premium tax expenses Premium Tax Expenses An assessment levied by a state government on the net premium income collected. Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Underlying Securities Award Underlying Securities Amount Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Stock-based compensation (in shares) Weighted Average Number of Shares, Share Based Compensation Weighted Average Number of Shares, Share Based Compensation Credit Facility [Axis] Credit Facility [Axis] Number of members added through acquisition Business Combination, Number Of Managed Long Term Services And Support Members Business Combination, Number Of Managed Long Term Services And Support Members Other Other Securities [Member] Other Securities Amendment Flag Amendment Flag Carrying Amount Reported Value Measurement [Member] Entity Registrant Name Entity Registrant Name Mortgage-backed securities Commercial Mortgage-Backed Securities [Member] Cash paid for acquisition Payments to Acquire Businesses, Gross Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] In a Continuous Loss Position for Less than 12 Months, Total Number of Positions Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions Depreciation and amortization Depreciation, Depletion and Amortization Total margin Gross Profit Schedule of Restricted Cash and Cash Equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] MICHIGAN MICHIGAN Fair Value as of Grant Date Award Grant Date Fair Value Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One (Level 2) Fair Value, Inputs, Level 2 [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Geographical [Domain] Geographical [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Face amount Debt Instrument, Face Amount Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Insurance Claims Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Accounts payable, accrued and other long-term liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accounts Payable, Accrued And Other Noncurrent Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accounts Payable, Accrued And Other Noncurrent Liabilities Other, net Payments for (Proceeds from) Other Investing Activities Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] U.S. Treasury notes US Treasury Notes Securities [Member] Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Business Acquisition, Contingent Consideration [Line Items] Business Acquisition, Contingent Consideration [Line Items] Preferred stock, $0.001 par value; 20 million shares authorized, no shares issued and outstanding Preferred Stock, Value, Issued Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Fair Value Measurement [Domain] Fair Value Measurement [Domain] Net income per share - Basic (in dollars per share) Earnings Per Share, Basic Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Property, equipment, and capitalized software, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Other Liabilities Disclosure [Abstract] Other Liabilities Disclosure [Abstract] Number of potential for renewals Health Plan, Number Of Extension Options Health Plan, Number Of Extension Options Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Schedule of Available-for-Sale Investments Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Total current liabilities Liabilities, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Total assets Assets Concentrations of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Risk adjustment payable Affordable Care Act, Premium Stabilization Program, Risk Adjustment, (Payable) Affordable Care Act, Premium Stabilization Program, Risk Adjustment, (Payable) Medical care costs Cost of Goods and Services Sold Amount outstanding under letter of credit Long-Term Line of Credit Schedule of Intangible Assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of Fair Value of Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Purchases of property, equipment and capitalized software Payments to Acquire Property, Plant, and Equipment Other long-term liabilities Other Liabilities, Noncurrent Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Other Other Program [Member] Other Program Termination Date Trading Arrangement Termination Date Bright Health Medicare Brand New Day and Central Health Plan of California [Member] Brand New Day and Central Health Plan of California Mortgage-backed securities Collateralized Mortgage-Backed Securities [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Total revenue Total revenue Revenues Assets acquired: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Entity Address, City or Town Entity Address, City or Town Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Schedule of The Provisional Fair Values Assigned To Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Net income Net income Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Business Acquisition [Axis] Business Acquisition [Axis] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Marketplace Marketplace [Member] Marketplace Third-party escrow Escrow Deposit Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Entity File Number Entity File Number Document Fiscal Year Focus Document Fiscal Year Focus Total Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Entity Address, Address Line Two Entity Address, Address Line Two Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Weighted-average number of shares issued: Weighted Average Number of Shares Outstanding, Basic [Abstract] Total assets Assets, Fair Value Disclosure Name Forgone Recovery, Individual Name Document Period End Date Document Period End Date Municipal securities Municipal Securities [Member] Municipal securities. Deferred income taxes Increase (Decrease) in Deferred Income Taxes Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Insider Trading Arrangements [Line Items] Other operating Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Pharmacy rebate receivables Pharmacy Rebate Receivables [Member] Pharmacy Rebate Receivables [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Schedule of Business Acquisitions, by Acquisition Schedule of Business Acquisitions, by Acquisition [Table Text Block] Adjustment to Compensation: Adjustment to Compensation [Axis] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Current year Current Year Claims and Claims Adjustment Expense Acquired receivable, fair value Business Combination, Acquired Receivable, Fair Value MISSISSIPPI MISSISSIPPI Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Current Reporting Status Entity Current Reporting Status Retained Earnings Retained Earnings [Member] Restricted cash and cash equivalents Restricted Cash and Cash Equivalents Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Denominator for basic net income per share (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Business Combination, Separately Recognized Transactions [Line Items] Business Combination, Separately Recognized Transactions [Line Items] Less: effect of income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Add: other operating revenues Other Operating Income Premium revenue Premiums Earned, Net In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Executive Category: Executive Category [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name Acquired balances, net of post-acquisition adjustments Liability for Unpaid Claims and Claims Adjustment Expense, Business Acquisitions, Net Of Post-Closing Adjustments Liability for Unpaid Claims and Claims Adjustment Expense, Business Acquisitions, Net Of Post-Closing Adjustments Common stock withheld to settle employee tax obligations Common Stock Withheld to Settle Employee Tax Obligations Common Stock Withheld to Settle Employee Tax Obligations In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Entity Filer Category Entity Filer Category NEW MEXICO NEW MEXICO Company Selected Measure Name Company Selected Measure Name