0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - Condensed Consolidated Statements Of Income link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - Condensed Consolidated Statements Of Comprehensive Income link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - Consolidated Statement of Stockholders' Equity Statement link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - Condensed Consolidated Statements Of Cash Flows link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Investments link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Fair Value Measurement link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Debt link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Equity link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Stock-Based Compensation Plans link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Net Income per Common and Common Equivalent Share link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Segment Reporting link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Fair Value Measurement (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Stock-Based Compensation Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Net Income per Common and Common Equivalent Share (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Segment Reporting (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Accounting Policies - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Investments - Available-for-sale and Held-to-maturity Investments (Detail) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Investments - Maturities of Available-for-sale and Held-to-maturity Securities (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Fair Value Measurement - Fair Value of Financial Assets and Financial Liabilities Measured on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Debt (Carrying Value of Company's Long-term Debt) (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Debt (Repayment of Debt) (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Debt (Estimated Fair Value of Company's Long-term Debt) (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Equity - Additional Information - Dividends (Detail) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Equity (Stock Repurchased During Period) (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Equity - Additional Information - Stock Repurchase Programs (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Stock-Based Compensation Plans - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Stock-Based Compensation Plans - Summary of RSU Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Stock-Based Compensation Plans - Summary of Stock-Based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Net Income per Common and Common Equivalent Share - Schedule of Earnings per Share Effect on Net Income and Weighted Average Number of Dilutive Potential Common Stock (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Commitments and Contingencies Commitments and Contingencies - Additional Information (Detail) (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Segment Reporting - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Segment Reporting Information by Segment (Detail) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Segment Reporting Information by Segment (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Segment Reporting Asset Information by Segment (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Segment Reporting Segment Reporting Information by Item Category (Details) link:presentationLink link:calculationLink link:definitionLink