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Total liabilities Liabilities, Fair Value Disclosure Add: Other operating revenues Other Operating Income Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Income taxes, net Income Taxes Paid, Net Liabilities assumed: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] Schedule of Fair Value of Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table 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 Total liabilities and stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Other assets Other Assets, Noncurrent Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Risk-free interest rate, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Maximum expected volatility rate inputs for fair value measurement Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Arrangement Duration Trading Arrangement Duration Entity Address, City or Town Entity Address, City or Town Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Schedule of Operating Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Outstanding, Weighted Average Remaining Contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Pharmacy payable Pharmacy Claims Payable Pharmacy Claims Payable 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] Termination Date Trading Arrangement Termination Date Proceeds from sales and maturities of investments Proceeds from sales and maturities of investments Proceeds from Sale and Maturity of Marketable Securities Common stock, shares authorized (in shares) Common Stock, Shares Authorized Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Premium tax revenue Health Care Organization, Premium Tax Revenue Health Care Organization, Premium Tax Revenue Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Premium tax expenses Premium Tax Expenses An assessment levied by a state government on the net premium income collected. Award Timing Disclosures [Line Items] NEW YORK NEW YORK Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Fair value of restricted shares vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value 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 Income Taxes Income Tax, Policy [Policy Text Block] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Future amortization expense, 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Three Insider Trading Arrangements [Line Items] Related Party [Axis] Related Party, Type [Axis] Share-based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Registrant Name Entity Registrant Name Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Award Timing Method Award Timing Method [Text Block] Future amortization expense, 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Two Adjustment to Compensation, Amount Adjustment to Compensation Amount Auditor Name Auditor Name Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Total IBNP Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Schedule of Fair Value Measurements of Senior Notes Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Entity Central Index Key Entity Central Index Key Pretax Charges Share-Based Payment Arrangement, Expense Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Cost Finite-Lived Intangible Assets, Gross Income Tax Authority [Domain] Income Tax Authority [Domain] Name Trading Arrangement, Individual Name Other comprehensive income (loss), net of tax Other comprehensive income (loss), net Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag Operating leases, weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Fair value of assets measured on recurring basis Assets, Fair Value Disclosure [Abstract] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Business Combinations Business Combinations Policy [Policy Text Block] Long-term debt Total Long-term debt Long-Term Debt, Excluding Current Maturities Finance leases, weighted average remaining lease term Finance Lease, Weighted Average Remaining Lease Term Leasehold improvements Leasehold Improvements [Member] Diluted (in shares) Denominator for diluted net income per share (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Restricted investments Restricted Investments, Noncurrent Reinsurance Reinsurance Accounting Policy [Policy Text Block] Expenses: Operating Expenses [Abstract] Unrealized losses Deferred Tax Assets, Unrealized Currency Losses Gross realized investment loss Debt Securities, Available-for-Sale, Realized Loss Purchases of property, equipment and capitalized software Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Marketplace Marketplace [Member] Marketplace Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-Maturity [Table] Total assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Thereafter Finance Lease, Liability, to be Paid, after Year Five 2028 Long-Term Debt, Maturity, Year Five Other Operating Segment Reconciling Items [Member] Finance leases Finance Lease, Interest Payment on Liability Municipal securities Municipal Securities [Member] Municipal securities. Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Non-NEOs Non-NEOs [Member] Schedule of Balances of Restricted Investments Restrictions On Investments [Table Text Block] Restrictions On Investments [Table Text Block] Pharmacy rebate receivables Pharmacy Rebate Receivables [Member] Pharmacy Rebate Receivables [Member] Financing activities: Cash used in financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Non-PEO NEO Non-PEO NEO [Member] Adjustment to Compensation: Adjustment to Compensation [Axis] Net operating losses Deferred Tax Assets, Operating Loss Carryforwards Debt Instrument [Line Items] Debt Instrument [Line Items] Basic (in shares) Denominator for basic net income per share (in shares) Weighted Average Number of Shares Outstanding, Basic Revenue: Revenue: Revenues [Abstract] Other comprehensive income (loss): Statement of Other Comprehensive Income [Abstract] Product Information [Line Items] Product Information [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Statement [Line Items] Statement [Line Items] Condensed Financial Statements [Table] Schedule of Condensed Financial Statements [Table] Condensed Financial Statements [Table]