2401401 - Disclosure - Basis of Presentation (Details)
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2101100 - Disclosure - Basis of Presentation (Notes)
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2404402 - Disclosure - Business Combinations (Details)
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2404403 - Disclosure - Business Combinations Finite-Lived Intangible Assets Acquired (Details)
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2104100 - Disclosure - Business Combinations (Notes)
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2304301 - Disclosure - Business Combinations (Tables)
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2416403 - Disclosure - Commitments and Contingencies (Details)
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2116100 - Disclosure - Commitments and Contingencies (Notes)
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2416402 - Disclosure - Commitments and Contingencies Sale Leaseback Transaction (Details)
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2316301 - Disclosure - Commitments and Contingencies (Tables)
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1001000 - Statement - CONSOLIDATED BALANCE SHEETS (Unaudited)
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1001501 - Statement - CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical)
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1004000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)
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1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)
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1002001 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (Parenthetical)
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1002000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited)
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2413404 - Disclosure - Derivative Financial Instruments (Details)
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2413402 - Disclosure - Derivative Financial Instruments Fair Value on Consolidated Balance Sheets (Details)
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2413403 - Disclosure - Derivative Financial Instruments Gain (Loss) on Statement of Operations (Details)
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2113100 - Disclosure - Derivative Financial Instruments (Notes)
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2313301 - Disclosure - Derivative Financial Instruments (Tables)
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0001000 - Document - Document and Entity Information
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2407402 - Disclosure - Fair Value Measurements (Details)
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2407405 - Disclosure - Fair Value Measurements Details of Long-Term Debt (Details)
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2407404 - Disclosure - Fair Value Measurements Fair Value of Assets Measured on Recurring Basis Using Unobservable Inputs (Detail)
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2407403 - Disclosure - Fair Value Measurements Fair Value of Financial Instruments on Recurring Basis (Details)
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2107100 - Disclosure - Fair Value Measurements (Notes)
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2307301 - Disclosure - Fair Value Measurements (Tables)
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2408405 - Disclosure - Investments Available-for-Sale Investments (Details)
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2408404 - Disclosure - Investments Contractual Maturities of Investments (Details)
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2408402 - Disclosure - Investments (Details)
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2108100 - Disclosure - Investments (Notes)
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2408403 - Disclosure - Investments Summary of Investments (Details)
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2308301 - Disclosure - Investments (Tables)
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2412404 - Disclosure - Long-Term Debt Debt Instrument Interest Cost Recognized (Details)
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2412405 - Disclosure - Long-Term Debt (Details)
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2412402 - Disclosure - Long-Term Debt Maturities of Long-Term Debt (Details)
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2112100 - Disclosure - Long-Term Debt (Notes)
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2412403 - Disclosure - Long-Term Debt Schedule of Long-Term Debt (Details)
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2312301 - Disclosure - Long-Term Debt (Tables)
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2411402 - Disclosure - Medical Claims and Benefits Payable Components of Change in Medical Claims and Benefits Payable (Details)
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2411403 - Disclosure - Medical Claims and Benefits Payable (Details)
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2111100 - Disclosure - Medical Claims and Benefits Payable (Notes)
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2103100 - Disclosure - Net Income Per Share (Notes)
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2403402 - Disclosure - Net Income Per Share Summary of Denominators for Computation of Basic and Diluted Earnings Per Share (Detail)
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2303301 - Disclosure - Net Income Per Share (Table)
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2109100 - Disclosure - Receivables (Notes)
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2409402 - Disclosure - Receivables Summary of Accounts Receivable (Details)
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2309301 - Disclosure - Receivables (Tables)
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2417401 - Disclosure - Related Party Transactions (Details)
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2117100 - Disclosure - Related Party Transactions (Notes)
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2410403 - Disclosure - Restricted Investments Contractual Maturities of Our Held-to-Maturity Restricted Investments (Details)
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2110100 - Disclosure - Restricted Investments (Notes)
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2410402 - Disclosure - Restricted Investments Summary of Restricted Investments by Health Plan (Details)
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2310301 - Disclosure - Restricted Investments (Tables)
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2415402 - Disclosure - Segment Reporting (Details)
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2115100 - Disclosure - Segment Reporting (Notes)
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2415403 - Disclosure - Segment Reporting Schedule of Operating Segment Information (Details)
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2315301 - Disclosure - Segment Reporting (Tables)
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2406402 - Disclosure - Share-Based Compensation (Details)
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2106100 - Disclosure - Share-Based Compensation (Notes)
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2406404 - Disclosure - Share-Based Compensation Restricted Share Activity (Details)
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2406403 - Disclosure - Share-Based Compensation Stock-Based Compensation Expense (Details)
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2406405 - Disclosure - Share-Based Compensation Stock Option Activity (Details)
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2306301 - Disclosure - Share-Based Compensation (Tables)
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2402403 - Disclosure - Significant Accounting Policies (Details)
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2402405 - Disclosure - Significant Accounting Policies Income Taxes (Details)
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2102100 - Disclosure - Significant Accounting Policies (Notes)
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2202201 - Disclosure - Significant Accounting Policies (Policies)
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2402404 - Disclosure - Significant Accounting Policies Quality Incentive Premium Revenue Recognized (Details)
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2302302 - Disclosure - Significant Accounting Policies (Tables)
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2414401 - Disclosure - Stockholders' Equity (Details)
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2114100 - Disclosure - Stockholders' Equity (Notes)
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2419401 - Disclosure - Subsequent Events (Details)
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2119100 - Disclosure - Subsequent Events (Notes)
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2418401 - Disclosure - Variable Interest Entities (Details)
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2418402 - Disclosure - Variable Interest Entities New Markets Tax Credit (Details)
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2118100 - Disclosure - Variable Interest Entities (Notes)
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