Text Block [Abstract] Statement [Table] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Statement [Line Items] Statement [Line Items] Long-Term Debt Long-term Debt [Text Block] Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Disclosure Related Party Transactions Additional Information [Abstract] Disclosure Related Party Transactions Additional Information [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Building A Existing Building [Member] Existing Building [Member] Building B New Building [Member] New Building [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Area of Real Estate Property Area of Real Estate Property Lease Commencement Date Lease Commencement Date Lease Commencement Date Lease Expiration Date Lease Expiration Date Operating Leases, Rent Expense, Minimum Rentals Operating Leases, Rent Expense, Minimum Rentals Straight Line Rent Adjustments Straight Line Rent Adjustments Payments for medical services fees to related party Payments For Medical Services Fees To Related Party Payments for medical services fees to related party. Disclosure Significant Accounting Policies Additional Information [Abstract] Disclosure - Significant Accounting Policies - Additional Information [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. Schedule Of Premium Revenue By Health Plan Type [Axis] Schedule of Premium Revenue by Health Plan Type [Axis] Schedule of premium revenue by health plan type. Schedule Of Premium Revenue By Health Plan Type [Domain] Schedule Of Premium Revenue By Health Plan Type [Domain] Schedule of premium revenue by health plan type. California Health Plan California Health Plan [Member] California Health Plan [Member] Texas Health Plan Texas Health Plan [Member] Texas Health Plan [Member] Washington Health Plan Washington Health Plan [Member] Washington Health Plan [Member] New Mexico Health Plan New Mexico Health Plan [Member] New Mexico Health Plan [Member] Ohio Heath Plan Ohio Heath Plan [Member] Ohio Heath Plan [Member] Wisconsin Health Plan Wisconsin Health Plan [Member] Wisconsin Health Plan [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. Number of categories for component of premium revenue Number Of Categories For Component Of Premium Revenue Number of categories for component of premium revenue. Liability recorded related to profit sharing agreement Liability Recorded Related To Profit Sharing Agreement Liability recorded related to profit sharing agreement. Liability State Required Minimum, Medical Costs Liability State Required Minimum, Medical Costs Liability State Required Minimum, Medical Costs 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. Percentage of additional incremental revenue earned Percentage Of Additional Incremental Revenue Earned Percentage of additional incremental revenue earned. Unrecognized Tax Benefits Unrecognized Tax Benefits Unrecognized Tax Benefits State Refund Claims Unrecognized Tax Benefits State Refund Claims Unrecognized tax benefits state refund claims. Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate 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. 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. Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Cash Convertible Senior Notes due 2020 Cash Convertible Senior Notes due 2020 [Member] Cash Convertible Senior Notes due 2020 [Member] Convertible Senior Notes due 2014 Convertible Senior Notes due 2014 [Member] Convertible Senior Notes due 2014 [Member] Debt [Line Items] Debt [Line Items] Debt [Line Items] Details of the liability component: Long-term Debt, by Type Alternative [Abstract] Principal Balance Debt Instrument, Face Amount Unamortized Discount Debt Instrument, Unamortized Discount (Premium), Net Net Carrying Amount Long-term Debt, Gross Variable Interest Entities [Abstract] Variable Interest Entities [Abstract] Schedule of Variable Interest Entities [Table] 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 [Member] Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Variable Interest Entity, Consolidated, Carrying Amount, Assets Variable Interest Entity, Consolidated, Carrying Amount, Assets Variable Interest Entity, Consolidated, Carrying Amount, Liabilities Variable Interest Entity, Consolidated, Carrying Amount, Liabilities Variable Interest Entity, Financial or Other Support, Amount Variable Interest Entity, Financial or Other Support, Amount Disclosure Share Based Compensation Stock Option Activity [Abstract] Disclosure - Share-Based Compensation - Stock Option Activity [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] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Outstanding beginning balance, Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted, Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Exercised, Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited, Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Outstanding ending balance, Options Stock options exercisable and expected to vest ending balance, Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Exercisable ending balance, Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Outstanding beginning balance, Weighted average exercise price Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Fair Value Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Fair Value Weighted average grant date fair value, Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Exercised, Weighted average exercise price Share Based Compensation Arrangement By Share Based Payment Award Options Exercised In Period Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award options exercised in period weighted average grant date fair value. Forfeited, Weighted average exercise price Share Based Compensation Arrangement By Share Based Payment Award Options Forfeited In Period Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award options forfeited in period weighted average grant date fair value. Outstanding ending balance, Weighted average exercise price Stock options exercisable and expected to vest ending balance, Weighted average exercise price Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award options vested and expected to vest exercisable weighted average grant date fair value. Exercisable ending balance, Weighted average exercise price Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable In Period Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award options forfeited in period weighted average grant date fair value. Outstanding beginning balance, Average intrinsic value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Intrinsic Value Granted, Average intrinsic value Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Intrinsic Value Exercised, Average intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value Forfeited, Average intrinsic value Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Intrinsic Value Aggregate intrinsic value, Outstanding ending balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Stock options exercisable and expected to vest ending balance, Average intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Exercisable ending balance, Average intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Outstanding ending balance, Weighted average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Stock options exercisable and expected to vest ending balance, Weighted average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Exercisable ending balance, Weighted average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Disclosure Investments Additional Information [Abstract] Disclosure Investments Additional Information [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Realized investment gains (losses) Realized Investment Gains (Losses) Maturity period of securities Maturity Period Of Securities Maturity period of securities. Auction rate securities at par value Available-for-sale Securities Auction rate securities at par value, settled Available-for-sale Securities, Sold at Par Pretax unrealized gains Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Disclosure Investments Availablefor Sale Investments [Abstract] Disclosure - Investments - Available-for-Sale Investments [Abstract] 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] GSEs US Government-sponsored Enterprises Debt Securities [Member] Municipal securities Municipal Securities [Member] Municipal securities. Auction rate securities Auction Rate Securities [Member] U.S. treasury notes US Treasury Notes Securities [Member] 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, Aggregate Losses 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, Aggregate Losses 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. Derivative Financial Instruments Fair Value [Abstract] Derivative Financial Instruments Fair Value [Abstract] 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] Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block] Disclosure Stockholders Equity Additional Information [Abstract] Disclosure Stockholders Equity Additional Information [Abstract] Payments for Repurchase of Common Stock Payments for Repurchase of Common Stock Stock Repurchased During Period, Shares Stock Repurchased During Period, Shares Stock Repurchase Program Average Price Per Share Stock Repurchase Program Average Price Per Share Stock repurchase program average price per share. Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Accounting Policies [Abstract] Consolidation And Interim Financial Information Policy [Text Block] Consolidation And Interim Financial Information Policy [Text Block] Consolidation and interim financial information. Premium Revenue Premium Revenue [Policy Text Block] Premium revenue. Revenue Recognition, Policy Revenue Recognition, Policy [Policy Text Block] Income Tax, Policy Income Tax, Policy [Policy Text Block] Reclassifications Out of Accumulated Other Comprehensive Income Reclassifications Out of Accumulated Other Comprehensive Income [Policy Text Block] Reclassifications Out of Accumulated Other Comprehensive Income [Policy Text Block] Derivatives, Offsetting Fair Value Amounts, Policy Derivatives, Offsetting Fair Value Amounts, Policy [Policy Text Block] Premium Based Assessment Policy Premium Based Assessment Policy [Policy Text Block] Premium based assessment. Income Tax Disclosure [Abstract] Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Disclosure Restricted Investments Summary Of Restricted Investments By Health Plan [Abstract] Disclosure - Restricted Investments - Summary of Restricted Investments by Health Plan [Abstract] Schedule of Held-to-maturity Securities [Table] Schedule of Held-to-maturity Securities [Table] Schedule Of Restricted Investment By Health Plan Type [Axis] Schedule of Restricted Investment by Health Plan Type [Axis] Schedule of restricted investment by health plan type. Schedule Of Restricted Investment By Health Plan Type [Domain] Schedule Of Restricted Investment By Health Plan Type [Domain] Schedule of restricted investment by health plan type. Total Health Plans segment Long Term Restricted Investments [Member] Long Term Restricted Investments Florida Health Plan Florida Health Plan [Member] Florida Health Plan [Member] Michigan Health Plan Michigan Health Plan [Member] Michigan Health Plan [Member] Utah Health Plan Utah Health Plan [Member] Utah Health Plan [Member] Other Health Plan Other Health Plan [Member] Other health plan. Molina Medicaid Solutions [Member] Molina Medicaid Solutions [Member] Molina Medicaid Solutions. Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Restricted investments by health plan Restricted Investments, Noncurrent Disclosure Long Term Debt Additional Information [Abstract] Disclosure Long Term Debt Additional Information [Abstract] Derivative Instrument Risk [Axis] Derivative Instrument Risk [Axis] Derivative Contract Type [Domain] Derivative Contract Type [Domain] Embedded cash conversion option Embedded Derivative Financial Instruments [Member] Term loan Term Loan [Member] Term loan. Semi-annual Interest, First Payment Semi-annual Interest, First Payment [Member] Semi-annual Interest, First Payment [Member] Semi-annual Interest, Second Payment Semi-annual Interest, Second Payment [Member] Semi-annual Interest, Second Payment Debt Instrument [Line Items] Debt Instrument [Line Items] Debt Instrument, Issuance Date Debt Instrument, Issuance Date Proceeds from Issuance of Long-term Debt Proceeds from Issuance of Long-term Debt Overallotment Option, Amount Overallotment Option, Amount Overallotment Option, Amount Overallotment, Exercise Date Overallotment, Exercise Date Overallotment, Exercise Date Proceeds from Notes Payable Proceeds from Notes Payable Repayments of Long-term Debt Repayments of Notes Payable Debt Instrument, Frequency of Periodic Payment Debt Instrument, Frequency of Periodic Payment Percentage of contractual interest rate Debt Instrument, Interest Rate, Stated Percentage Interest Periodic Payment Commencement Date Interest Periodic Payment Commencement Date Interest Periodic Payment Commencement Date Debt Instrument, Call Date, Latest Debt Instrument, Call Date, Latest Debt Instrument, Call Date, Earliest Debt Instrument, Call Date, Earliest Debt Instrument, Convertible, Threshold Trading Days Debt Instrument, Convertible, Threshold Trading Days Debt Instrument, Convertible, Threshold Trading Days Debt Instrument, Convertible, Threshold Consecutive Trading Days Debt Instrument, Convertible, Threshold Consecutive Trading Days Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion. Percentage of last reported sale of common stock Percentage of last reported sale of common stock Percentage of last reported sale of common stock Senior notes conversion ratio Debt Instrument Convertible Number Of Equity Instruments Per One Thousand Principal Amount Of Debt Debt instrument convertible number of equity instruments per one thousand principal amount of debt. Debt Instrument, Convertible, Conversion Price Debt Instrument, Convertible, Conversion Price Repurchase Price, Maximum Percentage Repurchase Price, Maximum Percentage Maximum percentage of principal required for repurchase of Notes Embedded Derivative, Fair Value of Embedded Derivative Liability Embedded Derivative, Fair Value of Embedded Derivative Liability Senior note effective interest rate Debt Instrument, Interest Rate, Effective Percentage Term Loan Agreement Debt Instrument, Maturity Date Senior notes amortization period Debt Instrument, Convertible, Remaining Discount Amortization Period Payments of debt issuance costs Payments of Debt Issuance Costs Deferred Finance Costs, Gross Deferred Finance Costs, Gross Debt Finance Costs, Expensed Debt Finance Costs, Expensed Debt IFinance Costs, Expensed and not Capitalized Payments for Derivative Instrument, Financing Activities Payments for Derivative Instrument, Financing Activities Proceeds from Issuance of Warrants Proceeds from Issuance of Warrants Call Spread, Cash Paid Call Spread, Cash Paid Call Spread, Cash Paid Class of Warrant or Right, 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 Long-term debt Long-term Debt, Excluding Current Maturities Maturity period based on US government securities Maturity Period Based On Us Government Securities Maturity period based on US government securities. Senior notes debt maturity date Available-for-sale Securities, Debt Maturities, Date Debt Instrument, Convertible, Carrying Amount of Equity Component Debt Instrument, Convertible, Carrying Amount of Equity Component Principal amount Debt instrument increase in interest rate in case of default Debt Instrument, Increase in Interest Rate in Case of Default Debt instrument increase in interest rate in case of default. Debt instrument amortization period Debt Instrument Amortization Period Debt instrument amortization period. Repayments of Lines of Credit Repayments of Lines of Credit Maximum borrowing capacity under the revolving credit facility Line of Credit Facility, Maximum Borrowing Capacity Line of credit principal outstanding Line of Credit Facility, Amount Outstanding Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Net Income (Loss) per Share Earnings Per Share [Text Block] New Mexico Data Center [Member] New Mexico Data Center [Member] New Mexico data center. Tax Credit Claimed As Percentage Of Original Investment Amount Tax Credit Claimed As Percentage Of Original Investment Amount Tax credit claimed as percentage of original investment amount. Tax Credit Claimed As Percentage Of Original Investment Amount, Term Tax Credit Claimed As Percentage Of Original Investment Amount, Term Tax Credit Claimed As Percentage Of Original Investment Amount, Term Tax Credit Claimed As Percentage Of Original Investment Amount, Annual Credit Percentage, One to Three Years Tax Credit Claimed As Percentage Of Original Investment Amount, Annual Credit Percentage, One to Three Years Tax Credit Claimed As Percentage Of Original Investment Amount, Annual Credit Percentage, One to Three Years Tax Credit Claimed As Percentage Of Original Investment Amount, Annual Credit Percentage, Years Four to Seven Tax Credit Claimed As Percentage Of Original Investment Amount, Annual Credit Percentage, Years Four to Seven Tax Credit Claimed As Percentage Of Original Investment Amount, Annual Credit Percentage, Years Four to Seven Principal Amount Of Loan By Party Principal Amount Of Loan By Party Principal amount of loan by party. Proceeds Loaned to Related Party Proceeds Loaned to Related Party Proceeds Loaned to Related Party Capital Contribution by Related Party Capital Contribution by Related Party Capital contribution by related party. Proceeds from Other Debt Proceeds from Other Debt Fair Value Disclosures [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value, Disclosure Item Amounts [Domain] Fair Value, Disclosure Item Amounts [Domain] Carrying (Reported) Amount, Fair Value Disclosure Carrying (Reported) Amount, Fair Value Disclosure [Member] Estimate of Fair Value, Fair Value Disclosure Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, 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] Financing obligation Lease Note [Member] Lease Note [Member] Credit facility Credit Facility [Member] Credit facility. Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Debt Instrument, Fair Value Disclosure Debt Instrument, Fair Value Disclosure Derivative Financial Instruments [Abstract] Derivative Financial Instruments [Abstract] Derivative [Table] Derivative [Table] Interest rate swap derivative Interest Rate Swap [Member] Derivative [Line Items] Derivative [Line Items] Notional Amount of Interest Rate Derivative Instruments Not Designated as Hedging Instruments Notional Amount of Interest Rate Derivative Instruments Not Designated as Hedging Instruments Derivative, Inception Date Derivative, Inception Date Debt Instrument, Maturity Date Derivative, Basis Spread on Variable Rate Derivative, Basis Spread on Variable Rate Derivative, Fixed Interest Rate Derivative, Fixed Interest Rate 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. Disclosure Long Term Debt Debt Instrument Interest Cost Recognized [Abstract] Disclosure - Long-Term Debt - Debt Instrument Interest Cost Recognized [Abstract] Debt [Table] Debt [Table] Debt [Table] 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 on the liability component Amortization of Debt Discount (Premium) Total interest cost recognized Interest Expense, Debt Operating segment information Schedule of Segment Reporting Information, by Segment [Table Text Block] 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] Stock option activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Investments Marketable Securities [Table Text Block] Medical Claims and Benefits Payable Medical Claims And Benefits Payable [Text Block] Medical claims and benefits payable. Segment Reporting Segment Reporting Disclosure [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] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] 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] Fair value of investments Par value of auction rate securities sold Par Value Of Auction Rate Securities Sold Par value of auction rate securities sold. Derivative, warrants liability, percentage rate Income Statement [Abstract] Premium revenue Health Care Organization, Premium Revenue Service revenue Technology Services Revenue Investment income Interest and Dividend Income, Operating Rental and other income Operating Leases, Income Statement, Lease Revenue Total revenue Revenues Expenses: Costs and Expenses [Abstract] Medical care costs Policyholder Benefits and Claims Incurred, Health Care 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. Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Total expenses Costs and Expenses Operating income Operating Income (Loss) Interest expense Interest Expense Other income Other Income Total other expenses Other Nonoperating Income (Expense) Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net income Net Income (Loss) Attributable to Parent Net income per share: Earnings Per Share [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Derivative Derivative [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] Beginning Balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Total gains (unrealized only): Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issues, Settlements [Abstract] Net unrealized gains included in other comprehensive income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Net unrealized gains included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Purchases and issuances of assets (liabilities) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issues, Settlements Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Ending Balance The amount of total unrealized gains for the period included in other comprehensive income attributable to the change in accumulated other comprehensive losses relating to assets still held at the end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Disclosure Segment Reporting Schedule Of Operating Segment Information [Abstract] Disclosure - Segment Reporting - Schedule of Operating Segment Information [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Business Segments [Axis] Business Segments [Axis] Segment [Domain] Segment [Domain] Health Plans [Member] Health Plans [Member] Health plans. Operating Statistics [Line Items] Operating Statistics [Line Items] Operating Statistics [Line Items ] Health Plans: Health Plans [Abstract] Health plans. Molina Medicaid Solutions: Molina Medicaid Solutions [Abstract] Molina Medicaid solutions. Total revenue Depreciation and amortization: Depreciation, Depletion and Amortization [Abstract] Health Plans Depreciation, Depletion and Amortization Operating Income (Loss): Operating Income (Loss) [Abstract] Health Plans Interest expense Other Income Income (loss) before income taxes Goodwill and intangible assets, net: Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and intangible assets, net Goodwill And Intangible Assets Net Goodwill and intangible assets net. Total assets: Assets [Abstract] Total assets Assets 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 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 Property, equipment, and capitalized software, net Property, Plant and Equipment, Net Deferred contract costs Costs in Excess of Billings on Uncompleted Contracts or Programs Expected to be Collected after One Year Intangible assets, net Finite-Lived Intangible Assets, Net Goodwill and indefinite-lived intangible assets Goodwill Auction rate securities Auction Rate Securities, Noncurrent Restricted investments Derivative asset Derivative Assets Other assets Other Assets, Noncurrent Total 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 Income taxes payable Accrued Income Taxes, Current Current maturities of long-term debt Long-term Debt, Current Maturities Total current liabilities Liabilities, Current Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Derivative liabilities Derivative Liabilities Other long-term liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.001 par value; 80,000 shares authorized; outstanding: 45,415 shares at March 31, 2013 and 46,762 shares at December 31, 2012 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 Treasury stock, at cost; 111 shares at December 31, 2012 Treasury Stock, Value Retained earnings Retained Earnings (Accumulated Deficit) Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Information [Table] Document Information [Table] Entity Information [Line Items] Entity Information [Line Items] 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 Partners' Capital [Abstract] Net income Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Unrealized gain on investments Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Summary of denominators for the computation of basic and diluted net income (loss) per share Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] Disclosure Share Based Compensation Stock Based Compensation Expense [Abstract] Disclosure - Share-Based Compensation - Stock-Based Compensation Expense [Abstract] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Restricted Stock [Member] Restricted Stock [Member] Stock Options [Member] Stock Options [Member] Total share-based compensation expense Allocated Share-based Compensation Expense 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] Receivables Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Derivative Instruments Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Text Block] Related Party Transactions Related Party Transactions Disclosure [Text Block] Disclosure Segment Reporting Additional Information [Abstract] Disclosure Segment Reporting Additional Information [Abstract] Segment Information [Table] Segment Information [Table] Segment Information [Table] Segment Information [Line Items] Segment Information [Line Items] Segment Information [Line Items] Number of reportable segments Number of Reportable Segments Disclosure Medical Claims And Benefits Payable Additional Information [Abstract] Disclosure - Medical Claims And Benefits Payable - Additional Information [Abstract] Insurance Claims [Table] Insurance Claims [Table] Insurance Claims [Table] Insurance Claims [Line Items] Insurance Claims [Line Items] Insurance Claims [Line Items] Policy Holder Benefits Prior Percentage Policy Holder Benefits Prior Percentage Policy holder benefits prior percentage. Benefit from prior period claims development Benefit From Prior Period Claims Development Benefit from prior period claims development Prior Year Components Of Incurred Medical Care Costs Prior Year Components Of Incurred Medical Care Costs Prior year components of incurred medical care costs. Increase in number of health plan members per month Increase In Number Of Health Plan Members Per Month Increase in number of health plan members per month. Disclosure Basis Of Presentation Additional Information [Abstract] Disclosure Basis Of Presentation Additional Information [Abstract] Basis Of Presentation [Table] Basis Of Presentation [Table] Basis Of Presentation [Table] Major Customers [Axis] Major Customers [Axis] Name of Major Customer [Domain] Name of Major Customer [Domain] Louisianna Medicaid Management Information Systems [Member] Louisianna Medicaid Management Information Systems [Member] Louisianna Medicaid Management Information Systems [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Health Care Organization, Premium Revenue [Member] Health Care Organization, Premium Revenue [Member] Health Care Organization, Premium Revenue [Member] Basis Of Presentation [Line Items] Basis Of Presentation [Line Items] Basis Of Presentation [Line Items] Number of reportable segments Number Of Operating Reportable Segments Number Of Operating Reportable Segments 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. Minimum Medicaid contract term Minimum Contract Term Minimum contract term. Maximum Medicaid contract term Maximum Contract Term Maximum contract term. Concentration Risk, Percentage Concentration Risk, Percentage Estimated Annual Health Care Organization, Premium Revenue, Amount Estimated Annual Health Care Organization, Premium Revenue, Amount Estimated Annual Health Care Organization, Premium Revenue, Amount Disclosure Investments Contractual Maturities Of Investments [Abstract] Disclosure - Investments - Contractual Maturities of Investments [Abstract] 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 Total, Amortized Cost Available-for-sale Securities, Debt Maturities, 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 Significant Accounting Policies Significant Accounting Policies [Text Block] Statement of Cash Flows [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income 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 Deferred income taxes Increase (Decrease) in Deferred Income Taxes Stock-based compensation Share-based Compensation Gain on sale of subsidiary Gain (Loss) on Sale of Stock in Subsidiary Non-cash interest on convertible senior notes Change in fair value of derivatives Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Amortization of premium/discount on investments Investment Income, Net, Amortization of Discount and Premium Amortization of deferred financing costs Amortization of Financing Costs Tax deficiency from employee stock compensation Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Operating Activities Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Receivables Increase (Decrease) in Receivables Prepaid expenses and other current 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 equipment Payments to Acquire Machinery and Equipment Purchases of investments Payments to Acquire Marketable Securities Sales and maturities of investments Proceeds from Sale and Maturity of Marketable Securities Proceeds from sale of subsidiary, net of cash surrendered Proceeds from Divestiture of Businesses and Interests in Affiliates Increase in deferred contract costs Payments to Acquire Projects Increase in restricted investments Increase (Decrease) of Restricted Investments Change in other non-current assets and liabilities Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net 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 1.125% Notes, net of deferred issuance costs Purchase of call option relating to 1.125% Notes Proceeds from issuance of warrants Treasury stock purchases Repayment of amounts borrowed under credit facility Repayments of Long-term Lines of Credit Amount borrowed under credit facility Proceeds from Long-term Lines of Credit Principal payments on term loan Repayments of Long-term Debt Proceeds from employee stock plans Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Excess tax benefits from employee stock compensation Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, 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 Interest Interest Paid Schedule of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Retirement Of Treasury Stock Retirement Of Treasury Stock Retirement of treasury stock. Common stock used for stock-based compensation Stock Repurchased and Retired During Period, Value Details of sale of subsidiary: Details of Business Combinations Abstract Details of business combinations: Decrease in carrying value of assets Fair Value of Assets Acquired Decrease in carrying value of liabilities Liabilities Assumed Gain on sale Supplemental Deferred Purchase Price Proceeds from sale of subsidiary, net of cash surrendered Quality incentive premium revenue recognized Quality Incentive Premium Revenue Recognized [Table Text Block] Quality incentive premium revenue recognized. 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 Treasury Stock, Shares Treasury Stock, Shares Disclosure Earnings Per Share Summary Of Denominators For Computation Of Basic And Diluted Earnings Per Share [Abstract] Disclosure - Earnings Per Share - Summary of Denominators for Computation of Basic and Diluted Earnings Per Share [Abstract] 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 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 repurchased Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation Weighted-average number of shares issued Weighted Average Number of Shares Issued, Basic Denominator for basic income (loss) per share Denominator For Basic Earnings Per Share Denominator for basic earnings per share. Dilutive effect of employee stock options and stock grants (1) Incremental Common Shares Attributable to Share-based Payment Arrangements Incremental Common Shares Attributable to Conversion of Debt Securities Incremental Common Shares Attributable to Conversion of Debt Securities Denominator for diluted income (loss) per share (2) Denominator For Diluted Earnings Per Share Denominator for diluted earnings per share. Antidilutive weighted restricted shares Weighted Average Number of Shares, Restricted Stock Antidilutive Securities Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Disclosure Significant Accounting Policies Quality Incentive Premium Revenue Recognized [Abstract] Disclosure - Significant Accounting Policies - Quality Incentive Premium Revenue Recognized [Abstract] New Mexico Ohio Texas Wisconsin Health Plan [Member] New Mexico Ohio Texas Wisconsin Health Plan [Member] Mexico Ohio Texas Wisconsin health plan. Maximum Available Quality Incentive Premium - Current Year Maximum Available Quality Incentive Premium Current Year Maximum available quality incentive premium current year. Amount of Current Year Quality Incentive Premium Revenue Recognized 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 from Prior Year Amount Of Quality Incentive Premium Revenue Recognized From Prior Year Amount of quality incentive premium revenue recognized from prior year. Total Quality Incentive Premium Revenue Recognized Quality Incentive Premium Revenue Recognized Quality incentive premium revenue recognized. Total Revenue Recognized Restricted Investments Restricted Investments Disclosure [Text Block] Restricted investments. Disclosure Receivables Summary Of Accounts Receivable [Abstract] Disclosure - Receivables - Summary of Accounts Receivable [Abstract] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Receivables By Health Plan [Axis] Receivables By Health Plan [Axis] Receivables by health plan. Receivables By Health Plan [Domain] Receivables By Health Plan [Domain] Receivables by health plan. Molina Medicaid Solutions Segment Medicaid Solutions Segment [Member] Molina Medicaid solutions segment. Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Health Plans segment: Health Plans Segment Receivables Health plans segment receivables. Total receivables Summary of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Disclosure Share Based Compensation Additional Information [Abstract] Disclosure Share Based Compensation Additional Information [Abstract] Performance Units [Member] Restricted Stock Units With Performance Conditions [Member] Restricted stock units with performance conditions. Title of Individual [Axis] Title of Individual [Axis] Title of Individual with Relationship to Entity [Domain] Title of Individual with Relationship to Entity [Domain] Chief Executive Officer [Member] Chief Executive Officer [Member] Chief Financial Officer [Member] Chief Financial Officer [Member] Chief Operating Officer [Member] Chief Operating Officer [Member] Chief Accounting Officer [Member] Chief Accounting Officer [Member] Chief Accounting Officer [Member] Officer [Member] Officer [Member] New Board Members [Member] New Board Members [Member] New Board Members [Member] Shares awarded Deferred Compensation Arrangement with Individual, Shares Issued Minimum operating revenue for vesting of awards Minimum Operating Revenue For Vesting Of Awards Minimum operating revenue for vesting of awards. Minimum EBITDA percentage for vesting of awards Minimum EBITDA percentage for vesting of awards Minimum EBITDA percentage for vesting of awards Unrecognized compensation expense Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Weighted average period Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Unvested Share Based Compensation, Recognition Period Unvested Share Based Compensation, Recognition Period Unvested Share Based Compensation, Recognition Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Granted in Period Pair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Granted in Period Pair 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, Total Fair Value Stock options granted Fair Value Assumptions, Risk Free Interest Rate Fair Value Assumptions, Risk Free Interest Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Disclosure Restricted Investments Contractual Maturities Of Our Heldto Maturity Restricted Investments [Abstract] Disclosure - Restricted Investments - Contractual Maturities of Our Held-to-Maturity Restricted Investments [Abstract] 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, Debt Maturities, Net Carrying Amount 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, Debt Maturities, Fair Value Variable Interest Entities Variable Interest Entities [Text Block] Variable Interest Entities [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Disclosure Medical Claims And Benefits Payable Components Of Change In Medical Claims And Benefits Payable [Abstract] Disclosure - Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable [Abstract] Balances at beginning of period Liability For Claims And Claims Adjustment Expense Health Liability for claims and claims adjustment expense health. Components of medical care costs related to: Components Of Medical Care Costs [Abstract] Components of medical care costs. Current period Current Year Components Of Incurred Medical Care Costs Current year components of incurred medical care costs. Prior periods Total medical care costs Payments for medical care costs related to: Payments For Medical Care Costs [Abstract] Payments for medical care costs. Current period Current Year Payments For Medical Care Costs Current year payments for medical care costs. Prior periods Prior Year Payments For Medical Care Costs Prior year payments for medical care costs. Total paid Payments For Medical Care Costs Payments for medical care costs. 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 Policy Holder Premium Revenue Prior Year Percentage Policy holder premium revenue prior year percentage. Total medical care costs Policy Holder Medical Care Cost Prior Year Percentage Policy holder medical care cost prior year percentage. Schedule Of Maturities Of Long Term Debt [Table] Schedule Of Maturities Of Long Term Debt [Table] Schedule of maturities of long term debt. Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] 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] Carrying Value Long-term Debt 2013 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2014 Long-term Debt, Maturities, Repayments of Principal in Year Two 2015 Long-term Debt, Maturities, Repayments of Principal in Year Three 2016 Long-term Debt, Maturities, Repayments of Principal in Year Four 2017 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Disclosure Commitments And Contingencies Additional Information [Abstract] Disclosure Commitments And Contingencies Additional Information [Abstract] Payments for Construction in Process Payments for Construction in Process Net assets of subsidiaries subject to restrictions Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries Restricted Cash and Investments, Current 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 Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Non-current asset [Member] Non-current assets [Member] Non-current assets Non-current liabilities [Member] Non-current liabilities [Member] Non-current liabilities [Member] 1.125% Call Option Call Option, Derivative Asset [Member] Call Option, Derivative Asset [Member] 1.125% Warrants Warrant [Member] Interest rate swap Derivative assets Derivative Asset, Fair Value, Gross Asset Derivative liabilities Derivative Liability, Fair Value, Gross Liability Derivative liabilities, total Derivative Liability, Fair Value, Amount Not Offset Against Collateral Disclosure Investments Summary Of Investments [Abstract] Disclosure - Investments - Summary of Investments [Abstract] Schedule of Restricted Investment by Health Plan Type [Axis] Subtotal - current investments Short-term Investments [Member] Government-sponsored enterprise securities (GSEs) Certificates of deposit Certificates of Deposit [Member] Amortized Cost Available-for-sale Debt Securities, Amortized Cost Basis Gross Unrealized Gains Available-for-sale Securities, Gross Unrealized Gains Gross Unrealized Losses Available-for-sale Securities, Gross Unrealized Losses Estimated Fair Value Available-for-sale Securities, Fair Value Disclosure Disclosure Share Based Compensation Restricted Share Activity [Abstract] Disclosure - Share-Based Compensation - Restricted Share Activity [Abstract] Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table] Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table] Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] 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 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 Derivative Instruments, Gain (Loss) by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) by Income Statement Location, by Derivative Instrument Risk Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other Income [Member] Other Income [Member] Derivative Instruments, Gain (Loss) by Income Statement Location, by Derivative Instrument Risk [Line Items] Derivative Instruments, Gain (Loss) by by Income Statement Location, by Derivative Instrument Risk [Line Items] [Line Items] for Derivative Instruments, Gain (Loss) by by Income Statement Location, by Derivative Instrument Risk Derivative, Gain on Derivative Derivative, Gain on Derivative Derivative, Loss on Derivative Derivative, Loss on Derivative Derivative, Loss on Derivative, Net Derivative, Gain (Loss) on Derivative, Net 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] Total Fair Value 1.125% Call Option derivative Derivative Financial Instruments, Assets [Member] Embedded conversion option derivative 1.125% Warrants derivative Derivative Financial Instruments, 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 Total liabilities measured at fair value on a recurring basis Liabilities, Fair Value Disclosure