Vesting of restricted stock units, net of shares withheld for taxes (in shares) Restricted Stock Units, Shares Issued Net Of Shares For Tax Withholdings Restricted Stock Units, Shares Issued Net Of Shares For Tax Withholdings 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] Statistical Measurement [Domain] Statistical Measurement [Domain] Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Cover [Abstract] Cover [Abstract] Net increase in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Deferred costs, current Capitalized Contract Cost, Net, Current Allowance for credit losses, available-for sale investments Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Other current liabilities Total other current liabilities Other Liabilities, Current Trading Symbol Trading Symbol All Trading Arrangements All Trading Arrangements [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Non-NEOs Non-NEOs [Member] Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Weighted average common shares outstanding (in shares) Weighted Average Number of Shares Issued, Basic Class A common stock Common Class A [Member] Pay vs Performance Disclosure [Line Items] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Accounts receivable Increase (Decrease) in Accounts Receivable Net Income per Common Share Earnings Per Share, Policy [Policy Text Block] Operating lease liabilities Increase (Decrease) in Operating Lease Liability Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Deposits held with a third party related to insurance services collateral Property, Liability And Casualty Insurance, Deposits Held With Third Party As Collateral For Services Property, Liability And Casualty Insurance, Deposits Held With Third Party As Collateral For Services Proceeds from stock option exercises Proceeds from Stock Options Exercised Changes in unrealized losses on investment securities, net of tax Other comprehensive loss OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Award Timing Disclosures [Line Items] Investment, Name [Domain] Investment, Name [Domain] Other Performance Measure, Amount Other Performance Measure, Amount Schedule of Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Operating lease liabilities Operating Lease, Liability, Noncurrent Segment Information Segment Reporting, Policy [Policy Text Block] Gross Realized Losses Debt Securities, Available-for-Sale, Realized Loss Revenue from Contract with Customer [Abstract] Other long-term assets Other Assets, Noncurrent Entity Tax Identification Number Entity Tax Identification Number Stock repurchased (in shares) Treasury Stock, Shares, Acquired Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Money market funds Money Market Funds [Member] Deferred costs, noncurrent Capitalized Contract Cost, Net, Noncurrent Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Treasury Stock Treasury Stock, Common [Member] U.S. government and agency securities US Treasury Securities [Member] Equity Components [Axis] Equity Components [Axis] Award Timing Method Award Timing Method [Text Block] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Share Repurchase Program [Table] Share Repurchase Program [Table] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Number of directors Number Of Directors Number Of Directors Insider Trading Policies and Procedures [Line Items] Use of Estimates Use of Estimates, Policy [Policy Text Block] Total costs and operating expenses Costs and Expenses Adjustment to Compensation, Amount Adjustment to Compensation Amount Compensation Amount Outstanding Recovery Compensation Amount Diluted net income per share: Earnings Per Share, Diluted [Abstract] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Entity Small Business Entity Small Business Company Selected Measure Amount Company Selected Measure Amount Proceeds from maturities of available-for-sale investments Gross Proceeds from Maturities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Tabular List, Table Tabular List [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Repurchase on common stock Stock Repurchased During Period, Value Sales and marketing Selling and Marketing Expense [Member] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Accrued expenses Accrued Liabilities, Current Second Nature Holdings, L.P Second Nature Holdings, L.P [Member] Second Nature Holdings, L.P Total potentially dilutive securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Accrued bonuses Accrued Bonuses, Current Beginning of period End of period Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Liability for reported claims and claims incurred but not reported Liability for Claims and Claims Adjustment Expense Current assets Assets, Current [Abstract] Goodwill Goodwill Tax withholding for net share settlement Payment, Tax Withholding, Share-Based Payment Arrangement Share repurchase program, authorized amount Share Repurchase Program, Authorized, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Product and Service [Domain] Product and Service [Domain] Schedule of Available-for-sale Securities [Table] Debt Securities, Available-for-Sale [Table] Options Stock Options Share-Based Payment Arrangement, Option [Member] Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Security Exchange Name Security Exchange Name Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Schedule of Available-for-sale Investments, by Remaining Contract Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Award Type [Axis] Award Type [Axis] Basic net income per share: Earnings Per Share, Basic [Abstract] Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Property and equipment, net Property, Plant and Equipment, Net Total liabilities Liabilities Value Added Services Value Added Services [Member] Value Plus Services [Member] Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Research and product development Research and Development Expense Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Accrued Employee Expenses Compensation Related Costs, General [Text Block] Expiration Date Trading Arrangement Expiration Date Cash from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Operating lease liabilities-current Operating Lease, Liability, Current Total Shareholder Return Amount Total Shareholder Return Amount Quota share of tenant liability insurance (as a percent) Reinsurance, Reinsured Risk, Percentage Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Gross Realized Gains Debt Securities, Available-for-Sale, Realized Gain Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Exercise of stock options (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Research and product development Research and Development Expense [Member] Cash paid in business acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Basis of Presentation and Significant Accounting Policies Basis of Accounting, Policy [Policy Text Block] Diluted (in shares) Weighted average common shares outstanding; diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Other comprehensive loss: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Numerator Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Total stockholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Treasury stock Treasury Stock, Value Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] Fair value, recurring measurements Fair Value, Recurring [Member] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Cost of revenue (exclusive of depreciation and amortization) Cost of Sales [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Accrued expenses and other liabilities Increase (Decrease) in Other Operating Liabilities Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Document Fiscal Period Focus Document Fiscal Period Focus All Executive Categories All Executive Categories [Member] Add: Weighted average diluted share-based payments outstanding (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Assets Assets [Abstract] Unvested performance stock units (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Document Type Document Type Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Average purchase price (in dollars per share) Shares Acquired, Average Cost Per Share Less: Weighted average unvested restricted shares subject to repurchase (in shares) Weighted Average Number of Shares, Restricted Stock Schedule of Sales, Calls, and Maturities Schedule of Realized Gain (Loss) [Table Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Maximum Maximum [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Accounts payable Accounts Payable, Current Accounting Policies [Abstract] Accounting Policies [Abstract] Current Fiscal Year End Date Current Fiscal Year End Date Statistical Measurement [Axis] Statistical Measurement [Axis] PEO Name PEO Name Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Matt Mazza [Member] Matt Mazza Income before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Award Type [Domain] Award Type [Domain] Name Outstanding Recovery, Individual Name Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Deferred income taxes Deferred Income Tax Assets, Net Non-PEO NEO Non-PEO NEO [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Award Timing Predetermined Award Timing Predetermined [Flag] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Investment, Name [Axis] Investment, Name [Axis] Diluted (in dollars per share) Net income per common share, diluted (in dollars per share) Earnings Per Share, Diluted Class of Stock [Axis] Class of Stock [Axis] Estimated Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Schedule of Weighted Average Number of Shares Schedule of Weighted Average Number of Shares [Table Text Block] Deferred Costs Revenue from Contract with Customer [Policy Text Block] Amortization of operating lease right-of-use assets Operating Lease, Right-of-Use Asset, Periodic Reduction Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Proceeds from sales of available-for-sale investments Gross Proceeds from Sales Proceeds from Sale of Debt Securities, Available-for-Sale Number of operating segments Number of Operating Segments Less: undistributed earnings to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Stock-based compensation, including as amortized Share-Based Payment Arrangement, Noncash Expense Sales and marketing Selling and Marketing Expense Provision (benefit from) for income taxes Income tax expenses (benefit) Income Tax Expense (Benefit) Supplemental disclosure of cash flow information Supplemental Cash Flow Information [Abstract] Stock-based compensation expense, weighted average recognition period (in years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Net income attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Diluted Revenue Total revenue Revenue from Contract with Customer, Excluding Assessed Tax Compensation Related Costs [Abstract] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Income from operations Operating Income (Loss) Business Acquisition [Line Items] Business Acquisition [Line Items] Number of reportable segments Number of Reportable Segments Total liabilities and stockholders’ equity Liabilities and Equity Subsequent Event Subsequent Events [Text Block] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] All Adjustments to Compensation All Adjustments to Compensation [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Accrued employee expenses Total accrued employee expenses Employee-related Liabilities, Current Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Additional paid-in capital Additional Paid in Capital Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Interest income, net Interest Income (Expense), Nonoperating Underlying Security Market Price Change Underlying Security Market Price Change, Percent Individual: Individual [Axis] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Product and Service [Axis] Product and Service [Axis] Entity Address, State or Province Entity Address, State or Province Statement [Line Items] Statement [Line Items] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Financial Instruments [Domain] Financial Instruments [Domain] Unvested, beginning balance (in dollars per share) Unvested, ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Minimum Minimum [Member] Share Repurchase Program [Line Items] Share Repurchase Program [Line Items] Restatement Determination Date Restatement Determination Date Adoption Date Trading Arrangement Adoption Date Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Schedule of Available-for-sale Securities Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Janet Kerr [Member] Janet Kerr Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Exercise Price Award Exercise Price Arrangement Duration Trading Arrangement Duration Subsequent Event Subsequent Event [Member] Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Costs and operating expenses: Costs and Expenses [Abstract] Stockholders’ equity: Equity, Attributable to Parent [Abstract] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] All Individuals All Individuals [Member] Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] PEO PEO [Member] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] RSUs and PSUs Restricted Stock Units And Performance Stock Units [Member] Restricted Stock Units And Performance Stock Units [Member] Name Trading Arrangement, Individual Name Other income (loss), net Other Nonoperating Income (Expense) Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Remaining stock-based compensation expense for unvested shares, not yet recognized Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Capitalization of software development costs Payments to Develop Software Other Other Services [Member] Other Services [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Money market funds Cash and Cash Equivalents, Fair Value Disclosure Capitalized contract cost, impairment loss Capitalized Contract Cost, Impairment Loss Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Depreciation and amortization Cost, Depreciation and Amortization Schedule of Accrued Employee Expenses Schedule of Accrued Employee Expenses [Table Text Block] Schedule of Accrued Employee Expenses Local Phone Number Local Phone Number Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Payment to purchase minority, non-controlling equity interest Payments to Acquire Interest in Subsidiaries and Affiliates Repurchase on common stock (in shares) Stock Repurchased During Period, Shares Conversion of Class B common stock to Class A common stock (in shares) Conversion of Stock, Shares Converted Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] PEO Total Compensation Amount PEO Total Compensation Amount Estimated Fair Value Estimated Fair Value Available-for-sale investment securities: Debt Securities, Available-for-Sale, Excluding Accrued Interest Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Common Stock Common Stock [Member] Measure: Measure [Axis] Unearned premium liabilities Unearned Premiums Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Entity Emerging Growth Company Entity Emerging Growth Company Other Other Sundry Liabilities, Current Entity Central Index Key Entity Central Index Key General and administrative General and Administrative Expense [Member] Restricted Stock Units With Service Conditions Restricted Stock Units With Service Conditions [Member] Restricted Stock Units With Service Conditions Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Equity Component [Domain] Equity Component [Domain] Financial Instrument [Axis] Financial Instrument [Axis] Cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Unvested restricted stock awards Restricted Stock [Member] Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Deferred costs Capitalized Contract Cost, Net Class B common stock Common Class B [Member] Title Trading Arrangement, Individual Title Core solutions Core Solutions [Member] Core Solutions [Member] Statement [Table] Statement [Table] Measurement Frequency [Domain] Measurement Frequency [Domain] Numerator Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] City Area Code City Area Code Current liabilities Liabilities, Current [Abstract] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Total current assets Assets, Current Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Available-for-sale Securities, Debt Maturities [Abstract] Available-for-Sale Securities, Debt Maturities [Abstract] Purchase of common stock Payments for Repurchase of Common Stock Document Information [Line Items] Document Information [Line Items] Weighted Average Grant Date Fair Value per Share Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Income Taxes Income Tax Disclosure [Text Block] Net income per common share: Earnings Per Share [Abstract] Retained earnings Retained Earnings (Accumulated Deficit) Class of Stock [Domain] Class of Stock [Domain] General and administrative General and Administrative Expense Deferred income taxes Deferred Income Taxes and Tax Credits Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Underlying Securities Award Underlying Securities Amount Investment Securities and Fair Value Measurements Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Amendment Flag Amendment Flag Vesting of restricted stock units, net of shares withheld for taxes Restricted Stock Units, Value, Shares Issued Net Of Tax Withholdings Restricted Stock Units, Value, Shares Issued Net Of Tax Withholdings Entity Registrant Name Entity Registrant Name Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Depreciation and amortization Depreciation, Depletion and Amortization Fair Value as of Grant Date Award Grant Date Fair Value Subsequent Events [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Amortization of costs capitalized to obtain revenue contracts Capitalized Contract Cost, Amortization Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Schedule of Product Information by Revenue Categories Disaggregation of Revenue [Table Text Block] Investment securities—current Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Common stock Common Stock, Value, Issued Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Other current liabilities Other Current Liabilities [Member] Cash from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Percent of targeted performance metric Share-based Compensation Arrangements By Share-Based Payment Award, Percent Of Award Target Performance Metric Share-based Compensation Arrangements By Share-Based Payment Award, Percent Of Award Target Performance Metric Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Restricted Stock Units with Service and Performance Conditions Restricted Stock Units with Service and Performance Conditions [Member] Restricted Stock Units with Service and Performance Conditions Basic (in dollars per share) Net income per common share, basic (in dollars per share) Earnings Per Share, Basic Accounts payable Increase (Decrease) in Accounts Payable Cash paid for amounts included in the measurement of lease liabilities included in operating cash flows Operating Lease, Payments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Other Liabilities Disclosure [Abstract] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Net income attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Total current liabilities Liabilities, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Denominator Weighted Average Number of Shares Outstanding, Diluted [Abstract] Other Current Liabilities Other Liabilities Disclosure [Text Block] Total assets Assets Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period U.S. government and agency securities US Treasury and Government [Member] Schedule of Fair Value, Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Other liabilities Other Liabilities, Noncurrent Share Repurchase Program Treasury Stock [Text Block] Cost of revenue (exclusive of depreciation and amortization) Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Commitments and contingencies (Note 6) Commitments and Contingencies Termination Date Trading Arrangement Termination Date Nature of Business Nature of Operations [Text Block] 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] Stock-Based Compensation Share-Based Payment Arrangement [Text Block] PSUs Performance Stock Units [Member] Performance Stock Units [Member] Entity Address, City or Town Entity Address, City or Town Total stock-based compensation expense Stock-based compensation expense Share-Based Payment Arrangement, Expense Net income Net income Net income Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Non-marketable debt securities Other Investment Not Readily Marketable, Fair Value Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Loss Contingencies [Table] Loss Contingencies [Table] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Entity File Number Entity File Number Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Revenue and Other Information Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Stock repurchased Treasury Stock, Value, Acquired, Cost Method Weighted average common shares outstanding: Denominator Weighted Average Number of Shares Outstanding, Basic [Abstract] Total Assets, Fair Value Disclosure Name Forgone Recovery, Individual Name Document Period End Date Document Period End Date Other Other Noncash Income (Expense) Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Unvested, beginning balance (in shares) Unvested, ending balance (in shares) Unvested restricted stock units (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Accrued payroll and other Accrued Payroll, Severance and Related Employee Costs, Current Accrued Payroll, Severance and Related Employee Costs, Current Insider Trading Arrangements [Line Items] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Other current assets Other Current Assets [Member] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Adjustment to Compensation: Adjustment to Compensation [Axis] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Accumulated other comprehensive (loss) Income Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Current Reporting Status Entity Current Reporting Status Retained Earnings Retained Earnings [Member] Restricted cash included in prepaid expenses and other current assets Restricted Cash and Cash Equivalents Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Basic (in shares) Weighted average common shares outstanding; basic (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Insurance reserves Self Insurance Reserve, Current Capitalized software development costs, net Capitalized Computer Software, Net Document Information [Table] Document Information [Table] Restricted stock units RSUs Restricted Stock Units (RSUs) [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Executive Category: Executive Category [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name Entity Filer Category Entity Filer Category Schedule of Other Current Liabilities Other Current Liabilities [Table Text Block] Purchases of available-for-sale investments Payments to Acquire Debt Securities, Available-for-Sale Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Share Repurchase Program [Abstract] Company Selected Measure Name Company Selected Measure Name