Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis Of Presentation [Table] Basis Of Presentation [Table] Basis Of Presentation [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Health Plans Health Plans [Member] Health plans. Basis Of Presentation [Line Items] Basis Of Presentation [Line Items] Basis Of Presentation [Line Items] Number of reportable segments Number of Reportable Segments Number of states in which entity operates Number of States in which Entity Operates Number of members eligible for the health care programs Number of Members Eligible for the Health Care programs Number of members eligible for the health care programs. Stockholders' Equity Note [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Accounting Policies [Abstract] Quality incentive premium revenue recognized Quality Incentive Premium Revenue Recognized [Table Text Block] Quality incentive premium revenue recognized. Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party Schedule of Related Party Transactions, by Related Party [Table] Property Subject to or Available for Operating Lease [Axis] Property Subject to or Available for Operating Lease [Axis] Property Subject to or Available for Operating Lease [Domain] Property Subject to or Available for Operating Lease [Domain] Property Subject to Operating Lease Property Subject to Operating Lease [Member] Name of Property [Axis] Name of Property [Axis] Name of Property [Domain] Name of Property [Domain] Building A Building A [Member] Building A [Member] Building B Building B [Member] Building B [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] 6th & Pine Development, LLC 6th & Pine Development, LLC [Member] 6th & Pine Development, LLC [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Number of office buildings leased Number of Property Leased Number of Property Leased Lease commencement date Lease Commencement Date Lease Commencement Date Lease expiration date Lease Expiration Date Number of extension option Number of Extension Option Number of Extension Option Lessee Leasing Arrangements, Operating Leases, Renewal Term Lessee Leasing Arrangements, Operating Leases, Renewal Term Initial annual rental expense Operating Leases, Rent Expense, Minimum Rentals Annual rental increase percentage Operating Leases, Rent Expense, Annual Increase Percentage Operating Leases, Rent Expense, Annual Increase Percentage Investments, Debt and Equity Securities [Abstract] Summary of restricted investments by health plan Schedule of Balances of Restricted Investments by Health Plan [Table Text Block] Schedule of balances of restricted investments by health plan. Contractual maturities of our held-to-maturity restricted investments Investments Classified by Contractual Maturity Date Held To Maturity Restricted Investments [Table Text Block] Investments classified by contractual maturities of our held-to-maturity restricted investments. Fair Value Disclosures [Abstract] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] General and administrative expenses General and Administrative Expense [Member] Other expenses, net Other Expense [Member] Eligible Item or Group for Fair Value Option [Axis] Eligible Item or Group for Fair Value Option [Axis] Fair Value, Option, Eligible Item or Group [Domain] Fair Value, Option, Eligible Item or Group [Domain] Auction rate securities Auction Rate Securities [Member] Derivatives, Net Derivative [Member] Contingent Consideration Liabilities Accrued Liabilities [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning Balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Total gains for the period recognized in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Total gains for the period recognized in other comprehensive income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Ending Balance Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning Balance Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value Total gains for the period recognized in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Total gains for the period recognized in other comprehensive income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Ending Balance Schedule of Restricted Cash and Cash Equivalents [Table] Schedule of Restricted Cash and Cash Equivalents [Table] Medicaid Solutions Segment Medicaid Solutions Segment [Member] Molina Medicaid solutions segment. Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] California CALIFORNIA Florida FLORIDA Illinois ILLINOIS Michigan MICHIGAN New Mexico NEW MEXICO Ohio OHIO South Carolina SOUTH CAROLINA Texas TEXAS Utah UTAH Washington WASHINGTON Direct delivery and other Other Health Plan [Member] Other health plan. Restricted Cash and Cash Equivalents Items [Line Items] Restricted Cash and Cash Equivalents Items [Line Items] Restricted investments by health plan Restricted Investments, Noncurrent Earnings Per Share [Abstract] Summary of denominators for the computation of basic and diluted net income (loss) per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Variable Interest Entities [Abstract] Variable Interest Entities [Abstract] Variable Interest Entity Variable Interest Entity Disclosure [Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Carrying Value Reported Value Measurement [Member] Total Fair Value Estimate of Fair Value Measurement [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 1.125% Notes Cash Convertible Senior Notes due 2020 [Member] Cash Convertible Senior Notes due 2020 [Member] 1.625% Notes Convertible Senior Notes Due 2044 [Member] Convertible Senior Notes Due 2044 [Member] 3.75% Notes Convertible Senior Notes due 2014 [Member] Convertible Senior Notes due 2014 [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Percentage of contractual interest rate on Notes Debt Instrument, Interest Rate, Stated Percentage Fair value of debt Debt Instrument, Fair Value Disclosure Other Liabilities Disclosure [Abstract] Medical Claims and Benefits Payable Medical Claims And Benefits Payable [Text Block] Medical claims and benefits payable. Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Debt Disclosure [Abstract] Interest cost recognized for the period relating to the: Interest Costs Incurred [Abstract] Contractual interest coupon rate Interest Expense, Debt, Excluding Amortization Amortization of the discount Amortization of Debt Discount (Premium) Total interest cost recognized Interest Expense, Debt Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] August 19, 2018 Debt Instrument, Redemption, Period One [Member] August 19, 2024 Debt Instrument, Redemption, Period Two [Member] August 19, 2029 Debt Instrument, Redemption, Period Three [Member] August 19, 2034 Debt Instrument, Redemption, Period Four [Member] August 19, 2039 Debt Instrument, Redemption, Period Five [Member] Debt Conversion Description [Axis] Debt Conversion Description [Axis] Debt Conversion, Name [Domain] Debt Conversion, Name [Domain] 3.75% Convertible Note Exchange 3.75% Convertible Note Exchange [Member] 3.75% Convertible Note Exchange [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Convertible Debt Convertible Debt [Member] Extinguishment of Debt [Axis] Extinguishment of Debt [Axis] Extinguishment of Debt, Type [Domain] Extinguishment of Debt, Type [Domain] Sale Leaseback Transaction, Description [Axis] Sale Leaseback Transaction, Description [Axis] Sale Leaseback Transaction, Name [Domain] Sale Leaseback Transaction, Name [Domain] June 2013 Transactions June 2013 Transactions [Member] June 2013 Transactions February 2013 Transactions February 2013 Transactions [Member] February 2013 Transactions Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Construction projects Construction in Progress [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Convertible Debt [Abstract] Convertible Debt [Abstract] Debt instrument issuance date Debt Instrument, Issuance Date Aggregate principal amount of convertible senior notes Long-term Debt, Excluding Current Maturities Frequency of periodic payment on Senior Notes Debt Instrument, Frequency of Periodic Payment Senior Notes maturity date Debt Instrument, Maturity Date Initial conversation rate on Notes Debt Instrument, Convertible, Conversion Ratio Conversion price per share of common stock Debt Instrument, Convertible, Conversion Price Debt discount amortization period Debt Instrument, Convertible, Discount Amortization Period Debt Instrument, Convertible, Discount Amortization Period Senior note effective interest rate (in percent) Debt Instrument, Interest Rate, Effective Percentage Senior notes amortization period Debt Instrument, Convertible, Remaining Discount Amortization Period Convertible debt, if-converted value in excess of principal Debt Instrument, Convertible, If-converted Value in Excess of Principal Extinguishment of Debt Disclosures [Abstract] Extinguishment of Debt Disclosures [Abstract] Amount of debt extinguished Extinguishment of Debt, Amount Aggregate principal amount of debt exchanged Proceeds from Issuance of Debt Shares issued from the exchange of Debt instruments (in shares) Debt Conversion, Converted Instrument, Shares Issued Face amount of debts Debt Instrument, Face Amount Proceeds from debt, net of issuance costs Proceeds from Debt, Net of Issuance Costs Premium amount on debt instruments Debt Instrument, Unamortized Premium Deferred issuance costs Deferred Finance Costs, Noncurrent, Gross Date of first required payment Debt Instrument, Date of First Required Payment Additional interest payable for any semiannual interest period with 1.625% Notes outstanding less than $100 million Debt Instrument, Interest Rate Increase, Contingent on Principal Amount Outstanding Additional interest rate per year to be payable for any semiannual interest period for which principal amount outstanding on Notes is less than the required amount Minimum 1.625% Notes outstanding balance threshold for additional interest payable Debt Instrument, Interest Rate Increase, Minimum Principal Amount Outstanding Threshold Debt Instrument, Interest Rate Increase, Minimum Principal Amount Outstanding Threshold Senior Notes [Abstract] Senior Notes [Abstract] Redemption period start date Debt Instrument, Redemption Period, Start Date Redemption period end date Debt Instrument, Redemption Period, End Date Redemption price of the principal amount (in percent) Debt Instrument, Redemption Price, Percentage Convertible debt carrying amount of equity component Debt Instrument, Convertible, Carrying Amount of Equity Component Repayment of debt Repayments of Debt Common stock issued to settle the conversion feature of Convertible Notes (shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Sale Leaseback Transaction, Net Book Value [Abstract] Sale Leaseback Transaction, Net Book Value [Abstract] Sale leaseback transaction term of lease Sale Leaseback Transaction, Term of Lease Sale Leaseback Transaction, Term of Lease Number of office buildings leased Property, equipment, and capitalized software, net Property, Plant and Equipment, Net Lease financing obligations Lease Financing Obligations Lease Financing Obligations Interest expense Interest Expense Rent expense Sale Leaseback Transaction, Rent Expense Schedule of Available-for-sale Securities Schedule of Available-for-sale Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Corporate debt securities Corporate Debt Securities [Member] Municipal securities Municipal Securities [Member] Municipal securities. GSEs US Government-sponsored Enterprises Debt Securities [Member] U.S. treasury notes US Treasury Notes Securities [Member] Certificates of deposit Certificates of Deposit [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value In a Continuous Loss Position for Less than 12 Months, Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss In a Continuous Loss Position for Less than 12 Months, Total Number of Securities Available For Sale Securities In Unrealized Loss Position Less Than Twelve Months Qualitative Disclosure Number Of Positions Available for sale securities in unrealized loss position less than twelve months qualitative disclosure number of positions. In a Continuous Loss Position for 12 Months or More, Estimated Fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value In a Continuous Loss Position for 12 Months or More, Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss In a Continuous Loss Position for 12 Months or More, Total Number of Securities Available For Sale Securities In Unrealized Loss Position Twelve Months Or More Qualitative Disclosure Number Of Positions Available for sale securities in unrealized loss position twelve months or more qualitative disclosure number of positions. Statement of Financial Position [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Investments Marketable Securities, Current Receivables Receivables, Net, Current Income taxes refundable Income Taxes Receivable, Current Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Prepaid expenses and other current assets Other Assets, Current Total current assets Assets, Current Deferred contract costs Costs in Excess of Billings, Noncurrent Intangible assets, net Finite-Lived Intangible Assets, Net Goodwill Goodwill Restricted investments Derivative asset Derivative Asset Other assets Other Assets, Noncurrent Total Assets Assets Current liabilities: Liabilities, Current [Abstract] Medical claims and benefits payable Liability for Claims and Claims Adjustment Expense Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Deferred revenue Deferred Revenue, Current Current maturities of long-term debt Long-term Debt, Current Maturities Total current liabilities Liabilities, Current Convertible senior notes Convertible Notes Payable, Noncurrent Lease financing obligations Lease Financing Obligations, Noncurrent Lease Financing Obligations, Noncurrent Lease financing obligations – related party Due to Related Parties, Noncurrent Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Derivative liability Derivative Liability Other long-term liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.001 par value; 150,000 shares authorized; outstanding: 48,279 shares at September 30, 2014 and 45,871 shares at December 31, 2013 Common Stock, Value, Outstanding Preferred stock, $0.001 par value; 20,000 shares authorized, no shares issued and outstanding Preferred Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Retained earnings Retained Earnings (Accumulated Deficit) Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Date [Axis] Award Date [Axis] Award Date [Domain] Award Date [Domain] March 2014 Grant March 2014 Grant [Member] March 2014 Grant [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Restricted Stock [Member] Employee Stock Option Employee Stock Option [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Shares awarded Deferred Compensation Arrangement with Individual, Shares Issued Unrecognized compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted average period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Fair value of restricted and performance stock awards granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Granted in Period Fair Value Share based compensation arrangement by share based payment award equity instruments other than options granted in period fair value. Total 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 Insurance Claims [Table] Insurance Claims [Table] Insurance Claims [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Medicaid Expansion Medicaid Expansion [Member] Medicaid Expansion [Member] Insurance Claims [Line Items] Insurance Claims [Line Items] Insurance Claims [Line Items] Percentage of liability for unpaid claims not paid out Claims Incurred But Not Paid (IBNP) Liability, Estimated Discount Percentage of Final Payment Claims Incurred But Not Paid (IBNP) Liability, Estimated Discount Percentage of Final Payment Policy holder benefits prior percentage Policy Holder Benefits Prior Percentage Policy holder benefits prior percentage. Favorable prior period claims development Prior Year Claims and Claims Adjustment Expense Number of members added Number of Members Added Number of Members Added Schedule of liability for unpaid claims and claims adjustment expense Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Components of 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] Segment Reporting [Abstract] Operating segment information Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of maturities of long-term debt Schedule of Maturities of Long-term Debt [Table Text Block] Long term debt Schedule of Long-term Debt Instruments [Table Text Block] Debt instruments interest cost recognized Schedule Of Debt Instruments Interest Cost Recognized [Table Text Block] Schedule of debt instruments interest cost recognized. Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Commitments and Contingencies Disclosure [Abstract] Other Commitments [Table] Other Commitments [Table] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Health Care Authority Health Care Authority [Member] Health Care Authority [Member] Other Commitments [Line Items] Other Commitments [Line Items] Amount paid to settle two overpayment claims Payment to Health Care Settlements Amount of cash outflow related to overpayment matters Proceeds from settlement of claims with HCA Proceeds from Health Care Settlements Amount of cash inflow related to health care settlement matters Reduction in premium revenue as a result of resolving all pending disputes Increase (Decrease) in Health Care Organization Premium Revenue Increase (Decrease) in Health Care Organization Premium Revenue Net assets of subsidiaries subject to restrictions Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries Restricted cash and investments Restricted Cash and Investments, Current Aggregate statutory capital and surplus Statutory Accounting Practices, Statutory Capital and Surplus, Balance Required minimum statutory capital surplus Statutory Accounting Practices, Statutory Capital and Surplus Required Schedule Of Premium Revenue By Health Plan Type Schedule of Premium Revenue by Health Plan Type [Table] Schedule of premium revenue by health plan type. California, Illinois, New Mexico, Ohio, Texas, Washington, and Wisconsin California, Illinois, New Mexico, Ohio, Texas, Washington, Wisconsin [Member] [Member] California, Illinois, New Mexico, Ohio, Texas, Washington, Wisconsin [Member] [Member] 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. Maximum available quality incentive premium - current period Maximum Available Quality Incentive Premium Current Year Maximum available quality incentive premium current year. Amount of quality incentive premium revenue recognized in current period: Earned current period Amount Of Current Year Quality Incentive Premium Revenue Recognized Amount of current year quality incentive premium revenue recognized. Amount of quality incentive premium revenue recognized in current period: Earned prior periods Amount Of Quality Incentive Premium Revenue Recognized From Prior Year Amount of quality incentive premium revenue recognized from prior year. Total amount of quality incentive premium revenue recognized in current period: Quality Incentive Premium Revenue Recognized Quality incentive premium revenue recognized. Total premium revenue recognized for state health plans with quality incentive premiums Health Care Organization, Premium Revenue Due in one year or less, Cost Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Due one year through five years, Cost Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Due after ten years, Cost Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Amortized Cost Available-for-sale Debt Securities, Amortized Cost Basis Due in one year or less, Estimated Fair Value Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Due one year through five years, Estimated Fair Value Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Due after ten years, Estimated Fair Value Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Total, Estimated Fair Value Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value Net Income per Share Earnings Per Share [Text Block] Insurance Claims [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Balances at beginning of period Components of medical care costs related to: Components Of Medical Care Costs [Abstract] Components of medical care costs. Current period Current Year Claims and Claims Adjustment Expense Prior period Total medical care costs Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Change in non-risk provider payables Medical Claims and Benefits Payable, Adjustments, Change in Provider Medical Claims and Benefits Payable, Adjustments, Change in Provider Payments for medical care costs related to: Payments For Medical Care Costs [Abstract] Payments for medical care costs. Current period Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Prior period Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Total paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Balances at end of period Benefit from prior period as a percentage of: Benefit From Prior Years As Percentage [Abstract] Benefit from prior years as percentage. Balance at beginning of period Premium revenue, trailing twelve months Policy Holder Premium Revenue Prior Year Percentage Policy holder premium revenue prior year percentage. Medical care costs, trailing twelve months Policy Holder Medical Care Cost Prior Year Percentage Policy holder medical care cost prior year percentage. Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares outstanding Common Stock, Shares, Outstanding Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Document and Entity Information [Abstract] -- None. No documentation exists for this element. -- Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Statement of Comprehensive Income [Abstract] Net income Net Income (Loss) Attributable to Parent Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Unrealized investment (loss) gain Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Effect of income taxes Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Statement of Cash Flows [Abstract] Statement Statement [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Gain on 1.125% Call Option Call Option, Derivative Asset [Member] Call Option, Derivative Asset [Member] Loss on 1.125% Notes Conversion Option Embedded Derivative Financial Instruments [Member] Loss on 1.125% Warrants Warrant [Member] Gain on interest rate swap Interest Rate Swap [Member] Statement [Line Items] Statement [Line Items] Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] 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] Depreciation and amortization Depreciation, Depletion and Amortization Deferred income taxes Increase (Decrease) in Deferred Income Taxes Stock–based compensation Share-based Compensation Amortization of convertible senior notes and lease financing obligations Amortization of Debt Discount (Premium) and Sale Leaseback Financing Obligation Amortization of Debt Discount (Premium) and Sale Leaseback Financing Obligation Other, net Other Operating Activities, Cash Flow Statement Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Receivables Increase (Decrease) in Receivables Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Medical claims and benefits payable Increase (Decrease) in Health Care Insurance Liabilities Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Deferred revenue Increase (Decrease) in Deferred Revenue Income taxes Increase (Decrease) in Income Taxes Payable Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of investments Payments to Acquire Marketable Securities Proceeds from sales and maturities of investments Proceeds from Sale and Maturity of Marketable Securities Purchases of equipment Payments to Acquire Machinery and Equipment Increase in restricted investments Increase (Decrease) of Restricted Investments Net cash paid in business combinations Payments to Acquire Businesses, Net of Cash Acquired Other, net Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from issuance of convertible senior notes, net of deferred financing costs Proceeds from Issuance of Long-term Debt Proceeds from sale-leaseback transactions Sale Leaseback Transaction, Gross Proceeds, Financing Activities Purchase of call option Payments for Derivative Instrument, Financing Activities Proceeds from issuance of warrants Proceeds from Issuance of Warrants Treasury stock purchases Payments for Repurchase of Common Stock Principal payments on term loan Repayments of Long-term Debt Repayment of amounts borrowed under credit facility Repayments of Long-term Lines of Credit Contingent consideration liabilities settled Payments to Acquire Business Two, Net of Cash Acquired Proceeds from employee stock plans Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Other, net Proceeds from (Payments for) Other Financing Activities Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Income taxes Income Taxes Paid, Net Interest Interest Paid Schedule of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] 3.75% Notes exchanged for 1.625% Notes Notes Issued Retirement of treasury stock Retirement Of Treasury Stock Retirement of treasury stock. Increase in non-cash lease financing obligation – related party Construction in Progress Expenditures Incurred but Not yet Paid Common stock used for stock-based compensation Stock Repurchased and Retired During Period, Value Details of change in fair value of derivatives, net: Details of change in fair value of derivatives [Abstract] Details of change in fair value of derivatives Change in fair value of derivatives, net Derivative, Gain (Loss) on Derivative, Net Business Combination, Description [Abstract] Business Combination, Description [Abstract] Fair value of assets acquired Fair Value of Assets Acquired Fair value of contingent consideration liabilities incurred Business Combination, Consideration Transferred Payable to seller Supplemental Deferred Purchase Price Escrow deposit Escrow Deposit Disbursements Related to Property Acquisition Net cash paid in business combinations California Department of Health Care Services California Department of Health Care Services [Member] California Department of Health Care Services [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities [Member] New Mexico,Texas, and Washington New Mexico, Texas, Washington [Member] New Mexico, Texas, Washington [Member] Medical premiums liability based on medical cost thresholds Medical Premiums Liability, Medical Care Costs Threshold Medical Premiums Liability, Medical Care Costs Threshold Premiums receivables Premiums and Other Receivables, Net Profit sharing liability Medical Premiums Liability, Profit Sharing Threshold Medical Premiums Liability, Profit Sharing Threshold Maximum period for member risk scores and member pharmacy cost experience after original year of service Maximum Period For Member Risk Scores And Member Pharmacy Cost Experience After Original Year Of Service Maximum period for member risk scores and member pharmacy cost experience after original year of service. Anticipated Medicare risk adjustment premiums Anticipated Medicare Risk Adjustment Premiums Anticipated Medicare risk adjustment premiums. Percentage of incremental revenue earned maximum Percentage Of Incremental Revenue Earned Maximum Percentage of incremental revenue earned maximum. Maximum alternative minimum payment upon expiration of the settlement agreement Health Care Organization, Alternative Minimum Payment Maximum Amount Health Care Organization, Alternative Minimum Payment Maximum Amount Plan rate settlement deficit, net of valuation discount Health Care Organization, Plan Rate Settlement Deficit (Surplus), Net Health Care Organization, Plan Rate Settlement Deficit (Surplus), Net Plan rate settlement deficit, valuation discount Health Care Organization, Plan Rate Settlement Deficit (Surplus), Valuation Discount Health Care Organization, Plan Rate Settlement Deficit (Surplus), Valuation Discount Benefit recognized during period Benefit Recognized During Period Benefit Recognized During Period Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Tax benefit related to deductibility of compensation for prior periods Other Tax Expense (Benefit) Impact of other tax benefit on earnings per diluted share Impact of Other Tax Expense (Benefit) on Earnings Per Share, Diluted Impact of Other Tax Expense (Benefit) on Earnings Per Share, Diluted Total unrecognized tax benefits Unrecognized Tax Benefits Unrecognized tax benefits decrease resulting from settlement agreement with a state Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Possible decrease in unrecognized tax benefit liabilities during the next 12 months Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Tax benefit from discontinued operations Discontinued Operation, Tax Effect of Discontinued Operation Estimated excise tax liability Health Insurers ACA Fees Liability, Estimated Annual Liability in Current Year Health Insurers ACA Fees Liability, Estimated Annual Liability in Current Year Income Statement [Abstract] Revenue: Revenues [Abstract] Premium revenue Service revenue Technology Services Revenue Premium tax revenue Health Care Organization, Premium Tax Revenue Health Care Organization, Premium Tax Revenue Health insurer fee revenue Health Care Organization, Insurer Fee Revenue Health Care Organization, Insurer Fee Revenue Investment income Interest and Dividend Income, Operating Other revenue Health Care Organization, Other Revenue Total revenue Revenues Operating expenses: Costs and Expenses [Abstract] Medical care costs Policyholder Benefits and Claims Incurred, Net, Health Cost of service revenue Technology Services Costs General and administrative expenses General and Administrative Expense Premium tax expenses Premium Tax Expenses An assessment levied by a state government on the net premium income collected. Health insurer fee expenses Health Care Organization, Insurer Fee Expense Health Care Organization, Insurer Fee Expense Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Total operating expenses Costs and Expenses Operating income Operating Income (Loss) Other expenses, net: Other Expenses [Abstract] Other expense (income), net Other Nonoperating Income (Expense) Total other expenses, net Nonoperating Income (Expense) Income from continuing operations before income tax expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Income from continuing operations Income (Loss) from Continuing Operations Attributable to Parent Income (loss) from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net income Basic net income (loss) per share: Earnings Per Share, Basic [Abstract] Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Basic net income per share (in dollars per share) Earnings Per Share, Basic Diluted net income (loss) per share: Earnings Per Share, Diluted [Abstract] Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Diluted net income per share (in dollars per share) Earnings Per Share, Diluted Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Investments Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Contractual maturities of investments Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of available for sale securities continuous unrealized loss position Schedule Of Available For Sale Securities Continuous Unrealized Loss Position [Table Text Block] Schedule of available for sale securities continuous unrealized loss position. Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition Schedule of Business Acquisitions, by Acquisition [Table] Contingent Consideration by Type [Axis] Contingent Consideration by Type [Axis] Contingent Consideration Type [Domain] Contingent Consideration Type [Domain] Number of Member Conversion Number of Member Conversion [Member] Number of Member Conversion [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Community Healthy Solutions of America, Inc. Community Healthy Solutions of America, Inc. [Member] Community Healthy Solutions of America, Inc. [Member] Lovelace Community Health Plan Lovelace Community Health Plan [Member] Lovelace Community Health Plan Healthy Palm Beaches, Inc Healthy Palm Beaches, Inc [Member] Healthy Palm Beaches, Inc [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Initial contingent consideration liability recorded Business Combination, Contingent Consideration Transferred Business Combination, Contingent Consideration Transferred Indemnification withhold funds transfer to restricted investment Restricted Investments Contingent consideration liability Business Combination, Contingent Consideration, Liability Change in fair value of contingent consideration liabilities Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability The final purchase price of the acquisition Business Combinations Business Combination Disclosure [Text Block] Restricted Investments Restricted Investments Disclosure [Text Block] Restricted investments. Subtotal - current investments Short-term Investments [Member] Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Estimated Fair Value Available-for-sale Securities Fair Value Measurements Fair Value Disclosures [Text Block] Derivative Derivative [Table] Non-current asset Non-current assets [Member] Non-current assets Non-current liabilities Non-current liabilities [Member] Non-current liabilities [Member] 1.125% Call Option 1.125% Notes Conversion Option derivative liability Derivative [Line Items] Derivative [Line Items] Derivative assets Derivative Asset, Fair Value, Gross Asset Derivative liabilities Derivative Liability, Fair Value, Gross Liability Percentage of contractual interest rate on Call Option Derivative, Fixed Interest Rate Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Total carrying amount of assets Variable Interest Entity, Consolidated, Carrying Amount, Assets Total amount of liabilities Variable Interest Entity, Consolidated, Carrying Amount, Liabilities Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Maturity period of securities Maturity Period Of Securities Maturity period of securities. Auction rate securities at par value Auction rate securities at par value, settled Available-for-sale Securities, Sold at Par Pretax unrealized gains Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table] Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table] Performance Units Restricted Stock Units With Performance Conditions [Member] Restricted stock units with performance conditions. Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Beginning Balance, Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted, Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested, Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited, Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Ending Balance, Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Begining Balance, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Ending Balance, Weighted Average Grant Date Fair Value Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table] Molina Medicaid Solutions Molina Medicaid Solutions [Member] Molina Medicaid Solutions. Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Health Plans: Health Plans [Abstract] Health plans. Molina Medicaid Solutions: Molina Medicaid Solutions [Abstract] Molina Medicaid solutions. Income from continuing operations before income tax: Operating Income (Loss) [Abstract] Health Plans Other expenses, net Long-Term Debt Long-term Debt [Text Block] Schedule Of Maturities Of Long Term Debt Schedule Of Maturities Of Long Term Debt [Table] Schedule of maturities of long term debt. Schedule of Maturities of Long-term Debt [Line Items] Schedule of Maturities of Long-term Debt [Line Items] [Line Items] for Schedule of Maturities of Long-term Debt [Table] Total Long-term Debt 2014 Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 2015 Long-term Debt, Maturities, Repayments of Principal in Year Two 2016 Long-term Debt, Maturities, Repayments of Principal in Year Three 2017 Long-term Debt, Maturities, Repayments of Principal in Year Four 2018 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Significant Accounting Policies Significant Accounting Policies [Text Block] Related Party Transactions Related Party Transactions Disclosure [Text Block] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Line Items] Class of Stock [Line Items] Increase in stockholders' equity Stockholders' Equity, Period Increase (Decrease) Stockholders' equity increased due to the exchange of debts Stock Issued During Period, Value, Conversion of Convertible Securities Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Employee stock transactions Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Trading days measurement period Class of Warrant or Right, Trading Days Measurement Period Class of Warrant or Right, Trading Days Measurement Period Warrants issued Debt Conversion, Converted Instrument, Warrants or Options Issued Warrant, strike price per share Class of Warrant or Right, Exercise Price of Warrants or Rights Authorized repurchase amount Stock Repurchase Program, Authorized Amount Remaining authorized balance available to repurchase stock Stock Repurchase Program, Remaining Authorized Repurchase Amount Number of common stock issued Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Receivables [Abstract] Receivables Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Consolidation and Interim Financial Information Consolidation And Interim Financial Information, Policy [Policy Text Block] Consolidation And Interim Financial Information, Policy [Policy Text Block] Premium Revenue – Health Plans Segment Premium Revenue [Policy Text Block] Premium revenue. Service Revenue and Cost of Service Revenue — Molina Medicaid Solutions Segment Revenue Recognition, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Details of the liability component: Long-term Debt, by Type Alternative [Abstract] Principal Balance Unamortized Discount Debt Instrument, Unamortized Discount (Premium), Net Net Carrying Amount Long-term Debt, Gross Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] 1.125% Warrants Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Shares outstanding at the beginning of the period Shares, Outstanding Weighted-average number of shares: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Repurchased Weighted Average Number of Shares, Common Stock Repurchased Weighted Average Number of Shares, Common Stock Repurchased Issued, 3.75% Exchange Weighted Average Number of Shares Issued, Exchange of Debt Instruments Weighted Average Number of Shares Issued, Exchange of Debt Instruments Issued, stock-based compensation and other Weighted Average Number of Shares Issued Weighted Average Number of Shares Issued Denominator for basic net income per share Weighted Average Number of Shares Outstanding, Basic Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Stock-based compensation Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 3.75% Notes and 3.75% Exchange Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Denominator for diluted net income per share Weighted Average Number of Shares Outstanding, Diluted Potentially dilutive common shares excluded from calculations Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Summary of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] 1.125% Call Option derivative Derivative Financial Instruments, Assets [Member] Contingent consideration liabilities Contingent Consideration Liabilities [Member] Contingent Consideration Liabilities [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 assets measured at fair value on a recurring basis Assets, Fair Value Disclosure 1.125 % Notes Conversion Option derivative liability Contingent consideration liabilities Business Combination, Contingent Consideration, Liability, Fair Value Disclosure Business Combination, Contingent Consideration, Liability, Fair Value Disclosure Total liability measured at fair value on a recurring basis Financial and Nonfinancial Liabilities, Fair Value Disclosure Participants in valuation data pool Fair Value Measurement, Valuation Data Pool of Participants Fair Value Measurement, Valuation Data Pool of Participants Employee stock purchase plan and stock options Total share-based compensation expense Allocated Share-based Compensation Expense Amortized Cost, Due in one year or less Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount Amortized Cost, Due one year through five years Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount Amortized Cost, Total Held-to-maturity Securities Estimated Fair Value, Due in one year or less Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value Estimated Fair Value, Due one year through five years Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value Estimated Fair Value, Total Held-to-maturity Securities, Fair Value Stock based compensation expense Schedule of Share-based Compensation, Activity [Table Text Block] Restricted share activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Fee-for-service claims incurred but not paid (IBNP) Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount Pharmacy payable Pharmacy Claims Payable Pharmacy Claims Payable Capitation payable Capitation Claims Payable Capitation Claims Payable Other Claims Payable Other Claims Payable Other Claims Payable Medical claims and benefits payable Non-risk provider payables Other Claims Payable, Non-Risk Provider Other Claims Payable, Non-Risk Provider Fair value of assets measured on recurring basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Fair value of assets measured on recurring basis using unobservable inputs Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule of fair value, asset and liabilities measured on recurring basis - disclosure only Schedule of Fair Value, Asset and Liabilities Measured on Recurring Basis - Disclosure Only [Table Text Block] Schedule of Fair Value, Asset and Liabilities Measured on Recurring Basis - Disclosure Only [Table Text Block] Segment Information Segment Reporting Disclosure [Text Block] Schedule of Financing Receivables Past Due Schedule of Financing Receivables Past Due [Table] Wisconsin WISCONSIN Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Total receivables