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Disclosure - Business Combinations (Details) link:presentationLink link:calculationLink link:definitionLink 40701 - Disclosure - Capitalized Internal-Use Software (Details) link:presentationLink link:calculationLink link:definitionLink 40801 - Disclosure - Property and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 40804 - Disclosure - Leases - Future maturities (Details) calc2 link:presentationLink link:calculationLink link:definitionLink 40901 - Disclosure - Goodwill and Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 41001 - Disclosure - Accrued Expenses (Details) link:presentationLink link:calculationLink link:definitionLink 41201 - Disclosure - Leases - Operating lease components (Details) link:presentationLink link:calculationLink link:definitionLink 41204 - Disclosure - Leases - Leases - Future maturities and leases that had not yet commenced (Details) link:presentationLink link:calculationLink link:definitionLink 41205 - Disclosure - Leases - Future minimum lease payments and rent expense under Topic 840 (Details) link:presentationLink link:calculationLink link:definitionLink 41301 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 41701 - Disclosure - Net Income Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 00090 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 00105 - Statement - Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 00300 - Statement - Consolidated Statements of Changes in Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 10101 - Disclosure - Organization and Description of Business link:presentationLink link:calculationLink link:definitionLink 10201 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 10401 - Disclosure - Corporate Investments and Funds Held for Clients link:presentationLink link:calculationLink link:definitionLink 10501 - Disclosure - Fair Value Measurement link:presentationLink link:calculationLink link:definitionLink 10601 - Disclosure - Business Combinations link:presentationLink link:calculationLink link:definitionLink 10701 - Disclosure - Capitalized Internal-Use Software link:presentationLink link:calculationLink link:definitionLink 10801 - Disclosure - Property and Equipment link:presentationLink link:calculationLink link:definitionLink 10901 - Disclosure - Goodwill and Intangible Assets link:presentationLink link:calculationLink link:definitionLink 11001 - Disclosure - Accrued Expenses link:presentationLink link:calculationLink link:definitionLink 11301 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 11401 - Disclosure - Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 11501 - Disclosure - Benefit Plans link:presentationLink link:calculationLink link:definitionLink 11601 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 11701 - Disclosure - Net Income Per Share link:presentationLink link:calculationLink link:definitionLink 11801 - Disclosure - Selected Quarterly Financial Data (unaudited) link:presentationLink link:calculationLink link:definitionLink 20202 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 30203 - Disclosure - Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 30403 - Disclosure - Corporate Investments and Funds Held For Clients (Tables) link:presentationLink link:calculationLink link:definitionLink 30503 - Disclosure - Fair Value Measurement (Tables) link:presentationLink link:calculationLink link:definitionLink 30603 - Disclosure - Business Combinations (Tables) link:presentationLink link:calculationLink link:definitionLink 30703 - Disclosure - Capitalized Internal-Use Software (Tables) link:presentationLink link:calculationLink link:definitionLink 30803 - Disclosure - Property and Equipment (Tables) link:presentationLink link:calculationLink link:definitionLink 30903 - Disclosure - Goodwill and Intangible Assets (Tables) link:presentationLink link:calculationLink link:definitionLink 31003 - Disclosure - Accrued Expenses (Tables) link:presentationLink link:calculationLink link:definitionLink 31203 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 31303 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 31503 - Disclosure - Benefit Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 31703 - Disclosure - Net Income Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 31803 - Disclosure - Selected Quarterly Financial Data (unaudited) (Tables) link:presentationLink link:calculationLink link:definitionLink 40201 - Disclosure - Summary of Significant Accounting Policies - Current Presentation, Concentration of Risk, Accounts Receivable (Details) link:presentationLink link:calculationLink link:definitionLink 40202 - Disclosure - Summary of Significant Accounting Policies - Capitalized Internal-Use Software (Details) link:presentationLink link:calculationLink link:definitionLink 40203 - Disclosure - Summary of Significant Accounting Policies - PP&E (Details) link:presentationLink link:calculationLink link:definitionLink 40204 - Disclosure - Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 40205 - Disclosure - Summary of Significant Accounting Policies - Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 40207 - Disclosure - Summary of Significant Accounting Policies - Cumulative effect of balance sheet changes (Details) link:presentationLink link:calculationLink link:definitionLink 40208 - Disclosure - Summary of Significant Accounting Policies - Impact on Balance Sheet (Details) link:presentationLink link:calculationLink link:definitionLink 40209 - Disclosure - Summary of Significant Accounting Policies - Impact on Statement of Operations and Other Comprehensive Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 40210 - Disclosure - Summary of Significant Accounting Policies - Impact on Cash Flow Statement (Details) link:presentationLink link:calculationLink link:definitionLink 40211 - Disclosure - Summary of Significant Accounting Policies - Adjustments for Adoption (Details) link:presentationLink link:calculationLink link:definitionLink 40301 - Disclosure - Revenue - Disaggregation (Details) link:presentationLink link:calculationLink link:definitionLink 40302 - Disclosure - Revenue - Deferred Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 40303 - Disclosure - Revenue - Deferred contract costs (Details) link:presentationLink link:calculationLink link:definitionLink 40304 - Disclosure - Revenue - Performance Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 40304 - Disclosure - Revenue - Performance Obligations Default (Details) link:presentationLink link:calculationLink link:definitionLink 40501 - Disclosure - Fair Value Measurement (Details) link:presentationLink link:calculationLink link:definitionLink 41101 - Disclosure - Debt (Details) link:presentationLink link:calculationLink link:definitionLink 41302 - Disclosure - Income Taxes - Carryforwards (Details) link:presentationLink link:calculationLink link:definitionLink 41401 - Disclosure - Stockholders' Equity (Details) link:presentationLink link:calculationLink link:definitionLink 41501 - Disclosure - Benefit Plans - General Information (Details) link:presentationLink link:calculationLink link:definitionLink 41502 - Disclosure - Benefit Plans - Incentive Plans Activity (Details) link:presentationLink link:calculationLink link:definitionLink 41503 - Disclosure - Benefit Plans - Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 41504 - Disclosure - Benefit Plans - Stock Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 41505 - Disclosure - Benefit Plans - RSU activity (Details) link:presentationLink link:calculationLink link:definitionLink 41506 - Disclosure - Benefit Plans - ESPP Information (Details) link:presentationLink link:calculationLink link:definitionLink 41507 - Disclosure - Benefit Plans - 401(k) Plan (Details) link:presentationLink link:calculationLink link:definitionLink 41801 - Disclosure - Selected Quarterly Financial Data (unaudited) (Details) link:presentationLink link:calculationLink link:definitionLink 10301 - Disclosure - Revenue link:presentationLink link:calculationLink link:definitionLink 11101 - Disclosure - Debt link:presentationLink link:calculationLink link:definitionLink 11201 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 30303 - Disclosure - Revenue (Tables) link:presentationLink link:calculationLink link:definitionLink 40206 - Disclosure - Summary of Significant Accounting Policies - Advertising, Segment Information (Details) link:presentationLink link:calculationLink link:definitionLink 41202 - Disclosure - Leases - Operating lease ROU assets, operating lease liabilities and other supplemental information (Details) link:presentationLink link:calculationLink link:definitionLink 41203 - Disclosure - Leases - Supplemental cash flow information (Details) link:presentationLink link:calculationLink link:definitionLink