2101100 - Disclosure - Basis of Presentation
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2401401 - Disclosure - Basis of Presentation - Additional Information (Details)
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2115100 - Disclosure - Commitments and Contingencies
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2415403 - Disclosure - Commitments and Contingencies - Additional Information (Detail)
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2415402 - Disclosure - Commitments and Contingencies Commitments and Contingencies - Sale Leaseback Transaction (Details)
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2315301 - Disclosure - Commitments and Contingencies 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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2412404 - Disclosure - Derivative Financial Instruments - Additional Information (Details)
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2112100 - Disclosure - Derivative Financial Instruments Derivative Financial Instruments
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2412402 - Disclosure - Derivative Financial Instruments - Derivative Instruments in The Consolidated Balance Sheets (Details)
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2312301 - Disclosure - Derivative Financial Instruments (Tables)
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2412403 - Disclosure - Derivative Financial Insturments - Derivative Instruments Gain (Loss) by Statement of Financial Performance (Details)
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0001000 - Document - Document and Entity Information
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2106100 - Disclosure - Fair Value Measurements
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2406402 - Disclosure - Fair Value Measurements - Additional Information (Details)
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2406405 - Disclosure - Fair Value Measurements - Details of Long-Term Debt (Details)
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2406404 - Disclosure - Fair Value Measurements - Fair Value of Assets Measured on Recurring Basis Using Unobservable Inputs (Detail)
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2406403 - Disclosure - Fair Value Measurements - Fair Value of Financial Instruments on Recurring Basis (Details)
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2306301 - Disclosure - Fair Value Measurements (Tables)
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2107100 - Disclosure - Investments
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2407405 - Disclosure - Investments - Additional Information (Detail)
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2407404 - Disclosure - Investments - Available-for-Sale Investments (Detail)
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2407403 - Disclosure - Investments - Contractual Maturities of Investments (Detail)
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2407402 - Disclosure - Investments - Summary of Investments (Detail)
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2307301 - Disclosure - Investments (Tables)
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2111100 - Disclosure - Long-Term Debt
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2411405 - Disclosure - Long-Term Debt - Additional Information (Details)
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2411404 - Disclosure - Long-Term Debt - Debt Instrument Interest Cost Recognized (Detail)
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2411402 - Disclosure - Long-Term Debt Long-Term Debt (Details)
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2411403 - Disclosure - Long-Term Debt - Schedule of Long-Term Debt (Detail)
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2311301 - Disclosure - Long-Term Debt (Tables)
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2110100 - Disclosure - Medical Claims and Benefits Payable
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2410403 - Disclosure - Medical Claims And Benefits Payable - Additional Information (Detail)
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2410402 - Disclosure - Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Detail)
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2310301 - Disclosure - Medical Claims and Benefits Payable (Tables)
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2103100 - Disclosure - Net Income Per Share
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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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2108100 - Disclosure - Receivables
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2408402 - Disclosure - Receivables - Summary of Accounts Receivable (Detail)
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2308301 - Disclosure - Receivables (Tables)
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2116100 - Disclosure - Related Party Transactions
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2416401 - Disclosure - Related Party Transactions - Additional Information (Detail)
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2109100 - Disclosure - Restricted Investments
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2409403 - Disclosure - Restricted Investments - Contractual Maturities of Our Held-to-Maturity Restricted Investments (Detail)
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2409402 - Disclosure - Restricted Investments - Summary of Restricted Investments by Health Plan (Detail)
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2309301 - Disclosure - Restricted Investments (Tables)
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2114100 - Disclosure - Segment Reporting
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2414402 - Disclosure - Segment Reporting - Additional Information (Detail)
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2414403 - Disclosure - Segment Reporting - Schedule of Operating Segment Information (Detail)
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2314301 - Disclosure - Segment Reporting (Tables)
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2102100 - Disclosure - Significant Accounting Policies
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2402403 - Disclosure - Significant Accounting Policies - Additional Information (Detail)
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2402405 - Disclosure - Significant Accounting Policies - Income Taxes (Details)
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2402404 - Disclosure - Significant Accounting Policies - Quality Incentive Premium Revenue Recognized (Details)
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2202201 - Disclosure - Significant Accounting Policies Significant Accounting Policies (Policies)
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2302302 - Disclosure - Significant Accounting Policies (Tables)
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2105100 - Disclosure - Stock-Based Compensation
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2405402 - Disclosure - Stock-Based Compensation - Additional Information (Detail)
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2405404 - Disclosure - Stock-Based Compensation - Restricted Share Activity (Detail)
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2405403 - Disclosure - Stock-Based Compensation - Stock-Based Compensation Expense (Detail)
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2405405 - Disclosure - Stock-Based Compensation - Stock Option Activity (Detail)
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2305301 - Disclosure - Stock-Based Compensation (Tables)
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2113100 - Disclosure - Stockholders' Equity
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2413401 - Disclosure - Stockholders' Equity - Additional Information (Detail)
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2117100 - Disclosure - Variable Interest Entities
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2417402 - Disclosure - Variable Interest Entities - Additional Information (Details)
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2417401 - Disclosure - Variable Interest Entities (Details)
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