Arlington Office Tower Arlington Office Tower [Member] Arlington Office Tower Operating lease obligations Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] 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] Payments of long-term debt assumed in acquisition Repayments of Long-Term Debt Expected federal income tax provision at statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Cover [Abstract] Cover [Abstract] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Net (decrease) increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Schedule of Lessee, Operating Lease, Liability, Maturity Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Foreign Plan Foreign Plan [Member] Acquired Technology Acquired Technology [Member] Acquired Technology [Member] Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Trading Symbol Trading Symbol Discounted rate par value (as a percent) Debt Instrument, Par Value, Discounted Rate Debt Instrument, Par Value, Discounted Rate Non-NEOs Non-NEOs [Member] Tax benefit from stock-based compensation Share-Based Payment Arrangement, Expense, Tax Benefit $27.36 - $37.02 Exercise Range 2 [Member] The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. New deferrals, net of amounts recognized in the current period Contract with Customer, Liability, New Deferrals, Net of Amounts Recognized in Current Period Contract with Customer, Liability, New Deferrals, Net of Amounts Recognized in Current Period Less: Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Rentable square feet Net Rentable Area 2026 Lessor, Operating Lease, Payment to be Received, Year Two Cash Equivalents Cash Equivalents [Member] 2029 Lessor, Operating Lease, Payment to be Received, Year Five Accounts receivable Increase (Decrease) in Accounts Receivable Net Income Per Share Earnings Per Share, Policy [Policy Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] INVESTMENTS AND FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Land Land [Member] Award Timing Disclosures [Line Items] Schedule of Financing Receivable, Allowance for Credit Loss Financing Receivable, Allowance for Credit Loss [Table Text Block] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Research and development credits Deferred Tax Assets, Tax Credit Carryforwards Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Plan Name [Domain] Plan Name [Domain] Sale of stock, price per share (in dollars per share) Sale of Stock, Price Per Share Deferred commission costs, net Deferred Tax Liabilities, Accrued Commissions Deferred Tax Liabilities, Accrued Commissions Measurement Period Adjustments Revision of Prior Period, Reclassification, Adjustment [Member] Accrued expenses and other current liabilities Accrued Liabilities And Other Liabilities, Current Accrued Liabilities And Other Liabilities, Current Leases [Abstract] Leases [Abstract] Finite-lived intangible assets, gross Finite-Lived Intangible Assets, Gross Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Effective tax rate reconciliation [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Deferred commission costs, net Capitalized Contract Cost, Net, Noncurrent Operating Segments Operating Segments [Member] Non-current portion Deferred Income, Noncurrent Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Property and equipment, net Property, Plant and Equipment, Additions Schedule of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Award Timing Method Award Timing Method [Text Block] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Weighted-average remaining lease term in years Finance Lease, Weighted Average Remaining Lease Term Insider Trading Policies and Procedures [Line Items] Use of Estimates Use of Estimates, Policy [Policy Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Compensation Amount Outstanding Recovery Compensation Amount 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] Small Business Entity Entity Small Business Company Selected Measure Amount Company Selected Measure Amount Payments of debt issuance costs Payments of Debt Issuance Costs 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] Intangible assets, net Estimated Fair Value Finite-Lived Intangible Assets Acquired Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Term of subscription-based license agreements (in years) Subscription-Based Licensing Agreement Minimum Term Years Subscription-Based Licensing Agreement Minimum Term Years Less: imputed interest Finance Lease, Liability, Undiscounted Excess Amount Schedule of Operating Lease Income Operating Lease, Lease Income [Table Text Block] Intangible assets, net Deferred Tax Liabilities, Goodwill and Intangible Assets Asset Acquisition [Axis] Asset Acquisition [Axis] Credit Facility [Domain] Credit Facility [Domain] Goodwill Goodwill Goodwill, beginning balance Goodwill, ending balance Total goodwill Goodwill Repurchase of restricted stock to satisfy tax withholding obligations Payment, Tax Withholding, Share-Based Payment Arrangement Other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Share repurchase program authorized Share Repurchase Program, Authorized, Amount Total leverage ratio Line Of Credit Facility, Covenant Compliance, Total Leverage Ratio Line Of Credit Facility, Covenant Compliance, Total Leverage Ratio Acquired Customer Base Acquired customer base Customer Contracts [Member] Stock Options Share-Based Payment Arrangement, Option [Member] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Increase in shares of common stock issued pursuant to stock plan (in shares) Increase In Shares Of Common Stock Issued Pursuant To Stock Plan The increase in the number of shares of common stock for issuance under the company stock plan. Depreciation expense for property and equipment Depreciation 2025 Lessee, Operating Lease, Liability, to be Paid, Year One Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Pension Plan Pension Plan [Member] Income taxes payable Accrued Income Taxes, Current Thereafter Long-Term Debt, Maturity, Interest Payments, After Year Five Long-Term Debt, Maturity, Interest Payments, After Year Five Weighted-average discount rate Finance Lease, Weighted Average Discount Rate, Percent 2025 Finance Lease, Liability, to be Paid, Year One Award Type [Axis] Award Type [Axis] Performance-based restricted stock awards Performance Based Restricted Stock [Member] Performance Based Restricted Stock [Member] Net deferred tax liabilities Deferred Tax Liabilities, Net Schedule of Summarized Information Regarding Options Outstanding Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block] Effect of foreign currency translation Goodwill, Foreign Currency Translation Gain (Loss) ROU assets obtained in exchange for new lease obligations: Right Of Use Assets Obtained In Exchange For Lease Obligations [Abstract] Right Of Use Assets Obtained In Exchange For Lease Obligations [Abstract] Non-cash lease expense Non Cash Lease Expense Non Cash Lease Expense Amortization of deferred commissions costs Amortization of deferred commissions costs Amortization of Deferred Sales Commissions Property and equipment, net Total property and equipment, net Property, Plant and Equipment, Net ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Total liabilities Total liabilities Liabilities Canceled or expired (dollars per share) Sharebased Compensation Shares Canceled or Expired Under Stock Option Plans Exercise Price Range The range of exercise prices for purposes of disclosing stock option canceled or expired and other required information pertaining to stock option plans in the customized range. Exercisable at end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Common stock, par or stated value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Weighted- Average Amortization Period (in years) Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Foreign Currency Translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Expiration Date Trading Arrangement Expiration Date Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Less: current portion of lease liabilities Operating Lease, Liability, Current Revenue recognized from contract assets Contract with Customer, Asset, Reclassified to Receivable Total Shareholder Return Amount Total Shareholder Return Amount Purchases of property, equipment, and other assets Payments to Acquire Property and Equipment and Other Assets Payments to Acquire Property and Equipment and Other Assets Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Net operating losses Deferred Tax Assets, Operating Loss Carryforwards OnTheMarket OnTheMarket [Member] OnTheMarket Commitment fees and other Line of Credit Facility, Commitment Fee Amount Subsequent Event [Line Items] Subsequent Event [Line Items] Property and equipment, gross Property, Plant and Equipment, Gross Exercise of stock options (in shares) Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Residential Residential [Member] Residential Debt Instrument [Line Items] Debt Instrument [Line Items] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Long-Lived Assets, Intangible Assets and Goodwill Goodwill and Intangible Assets, Policy [Policy Text Block] Expiration of the statute of limitation for assessment of taxes Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Weighted average outstanding shares — diluted (in shares) Denominator for diluted net income per share — weighted-average outstanding shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Outstanding (in dollars per share) Outstanding (in dollars per share) Share-Based Compensation Shares Outstanding Under Stock Option Plans Exercise Price Range The minimum and maximum exercise price range as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Total stockholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Total deferred tax assets, prior to valuation allowance Deferred Tax Assets, Gross  Options Exercisable Options Exercisable [Abstract] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Concentration Risk Type [Domain] Concentration Risk Type [Domain] New Accounting Pronouncements or Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Company match to employee contributions Defined Contribution Plan, Cost Proceeds from sale of property and equipment and other assets Proceeds From Sale Of Property And Equipment And Other Assets Proceeds From Sale Of Property And Equipment And Other Assets Cost of revenues Cost of revenues Cost of Sales [Member] Alternate Base Rate Alternate Base Rate [Member] Alternate Base Rate Shares of common stock authorized for issuance under the plan (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Sale of Stock [Domain] Sale of Stock [Domain] Document Fiscal Period Focus Document Fiscal Period Focus 2028 Long-Term Debt, Maturity, Year Four All Executive Categories All Executive Categories [Member] Stock options, restricted stock awards and restricted stock units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Statement of Financial Position Location, Balance [Domain] Statement of Financial Position Location, Balance [Domain] Share price of acquisition (in pound per share) Business Acquisition, Share Price Amortization expense for 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Two Depreciation and amortization expense Depreciation, Lessor Asset under Operating Lease Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Weighted average remaining contract life, outstanding (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Goodwill, expected tax deductible amount Business Acquisition, Goodwill, Expected Tax Deductible Amount ASSETS Assets [Abstract] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Write-offs charged against the allowance, net of recoveries and other Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) Dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Document Type Document Type Maximum annual employee contribution (as a percent) Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Schedule of Summarized EBITDA Information by Operating Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Lease right-of-use assets Deferred Tax Liabilities, Lease Right of Use Assets Deferred Tax Liabilities, Lease Right of Use Assets Weighted average remaining contract life, outstanding, exercisable (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Schedule of Contract with Customer, Asset and Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Subsequent Event [Table] Subsequent Event [Table] Maximum Maximum [Member] Number of shares (in shares) Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding Total finance lease costs Finance Lease, Expense Finance Lease, Expense Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Finite-lived intangible assets, net Finite-Lived Intangible Assets, Net Furniture, office equipment, and vehicles Furniture and Fixtures [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] Accounts payable Accounts Payable, Current Consideration owed for acquisitions Other Significant Noncash Transaction, Amounts Owed for Acquisitions Other Significant Noncash Transaction, Amounts Owed for Acquisitions Property operating expenses Direct Costs of Leased and Rented Property or Equipment Schedule of Fair Value Assumption for Options Granted Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Total lease costs Lease, Cost Merger exchange ratio, cash per share (in dollars per share) Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Cash Paid Per Acquiree Share Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Cash Paid Per Acquiree Share  Options Outstanding Share-Based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income before 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 Total deferred Deferred Other Tax Expense (Benefit) Property and equipment, net Deferred Tax Liabilities, Property, Plant and Equipment Name Outstanding Recovery, Individual Name Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Goodwill, impairment Goodwill, Impairment Loss Schedule of Anti-Dilutive Securities Excluded From Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Shares available, employee stock purchase plan (in shares) Shares Available, Employee Stock Purchase Plan Number of shares available as a result of an employee stock purchase plan. Term of credit facility (in years) Line of Credit Facility, Expiration Period Award Timing Predetermined Award Timing Predetermined [Flag] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Redemption price rate (as a percent) Debt Instrument, Redemption Price, Percentage Customer base Customer Relationships [Member] $20.49 - $27.35 Exercise Range 1 [Member] The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. Forecast Forecast [Member] LONG-TERM DEBT Long-Term Debt [Text Block] Net income per share — diluted (in dollars per share) Earnings Per Share, Diluted Counterparty Name [Domain] Counterparty Name [Domain] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Income from U.S. sources Income (Loss) from Continuing Operations before Income Taxes, Domestic State and Local Jurisdiction State and Local Jurisdiction [Member] Deferred revenue Increase (Decrease) in Contract with Customer, Liability Total current Current Income Tax Expense (Benefit) Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Share-based compensation arrangement, award vesting rights (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] 2027 Lessor, Operating Lease, Payment to be Received, Year Three Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Performance-Based RSAs - with Market Condition Performance-Based RSAs - with Market Condition [Member] Shares or units awarded to employees for meeting certain performance and market targets. Research credits Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Selling and marketing (excluding customer base amortization) Selling and Marketing Expense Income tax expense Total provision for income taxes Income Tax Expense (Benefit) Canceled or expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period Cash tax benefits resulting in net operating loss carryforward Realized Tax Benefits Related To Operating Loss Carryforward Amount of cash benefit realized from tax operating losses. An unrecognized tax benefit is presented in the financial statements as a reduction to a deferred tax asset. except as follows. To the extent a operating loss carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position, the unrecognized tax benefit is be presented in the financial statements as a liability and is not be combined with deferred tax assets. Weighted-average-period expected to recognize the unrecognized compensation cost (in years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Revenues Revenue from Contract with Customer, Excluding Assessed Tax Depreciation and amortization expense Depreciation And Amortization, Lessor Asset Under Operating Lease Depreciation And Amortization, Lessor Asset Under Operating Lease Product Information [Line Items] Product Information [Line Items] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Net cash (used in) investing activities Net Cash Provided by (Used in) Investing Activities Schedule of Supplemental Balance Sheet Information Related to Leases Supplemental Balance Sheet Information Related to Leases [Table Text Block] Supplemental Balance Sheet Information Related to Leases [Table Text Block] Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Business Acquisition [Line Items] Business Acquisition [Line Items] Other operating activities, net Other Operating Activities, Cash Flow Statement All Adjustments to Compensation All Adjustments to Compensation [Member] Accrued wages and commissions Employee-related Liabilities, Current Prepaid expenses and other current 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 Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Scenario [Domain] Scenario [Domain] Lease income Operating Lease, Lease Income Total undiscounted cash flows Lessor, Operating Lease, Payment to be Received Revenue, remaining performance obligation, expected timing of satisfaction, period (in years) Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Restricted cash Restricted Cash Entity Address, State or Province Entity Address, State or Province Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Financial Instruments [Domain] Financial Instruments [Domain] Unvested restricted stock at beginning of period (in dollars per share) Unvested restricted stock at end of period (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] Stock based compensation included in the personnel costs Employee Benefits and Share-Based Compensation Number of trade receivables in information services portfolio Number of Trade Receivables in Information Services Portfolio Number of Trade Receivables in Information Services Portfolio Restatement Determination Date Restatement Determination Date Allowance for credit losses Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Accounts Receivable, Allowance for Credit Loss Multifamily Multifamily [Member] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Outstanding at beginning of period (in dollars per share) Outstanding at end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Lease right-of-use assets ROU Assets Operating Lease, Right-of-Use Asset Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Outstanding at beginning of period (in shares) Outstanding at end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Exercise Price Range [Domain] Exercise Price Range [Domain] Visual Lease Visual Lease [Member] Visual Lease Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] NET INCOME PER SHARE Earnings Per Share [Text Block] Employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Subsequent Event Subsequent Event [Member] Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Commissions capitalized in the current period Commissions Capitalized in the Current Period Commissions Capitalized in the Current Period Weighted-average grant date fair value (in dollars per share) 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 Income Taxes Income Tax, Policy [Policy Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Segments [Domain] Segments [Domain] Weighted-average exercise price (in dollars per share) Share-Based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price Unrecognized Tax Benefits [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Long-term debt principal payments Maturities of Long-Term Debt [Abstract] Depreciation and other amortization Other Depreciation and Amortization PEO PEO [Member] Name Trading Arrangement, Individual Name Building Tenant Building Tenant [Member] Building Tenant Granted (in dollars per share) Share-Based Compensation Shares Granted Under Stock Option Plans Exercise Price Range The range of exercise prices for purposes of disclosing stock option granted and other required information pertaining to stock option plans in the customized range. Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Public Float Entity Public Float 2028 Lessor, Operating Lease, Payment to be Received, Year Four Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Commissions incurred Commissions Incurred Commissions Incurred 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] 2026 Long-Term Debt, Maturity, Interest Payments, Year Two Long-Term Debt, Maturity, Interest Payments, Year Two Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Local Phone Number Local Phone Number Valuation allowance Deferred Tax Assets, Valuation Allowance Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Total operating expenses Operating Expenses Asset Acquisition [Line Items] Asset Acquisition [Line Items] Current-period provision (release) for expected credit losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Weighted- Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Changes in operating assets and liabilities, net of acquisitions: Increase (Decrease) in Operating Capital [Abstract] ALLOWANCE FOR CREDIT LOSSES Credit Loss, Financial Instrument [Text Block] Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Property occupied (as a percent) Percentage Of Property Occupied Percentage Of Property Occupied PEO Total Compensation Amount PEO Total Compensation Amount Equity interest issued for acquisition (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Investments And Fair Value Disclosures [Abstract] Investments And Fair Value Disclosures Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Common Stock Common Stock [Member] Conversion ratio Stockholders' Equity Note, Stock Split, Conversion Ratio 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] Schedule of Deferred Lease Income Deferred Income [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Management stock purchase plan (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Entity Central Index Key Entity Central Index Key Scenario [Axis] Scenario [Axis] General and administrative General and administrative General and Administrative Expense [Member] Interest and penalties accrued on income taxes Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] CoStar Group, Inc. 2016 Stock Incentive Plan CoStar Group, Inc. 2016 Stock Incentive Plan [Member] CoStar Group, Inc. 2016 Stock Incentive Plan [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount STOCKHOLDERS' EQUITY Equity [Text Block] Accounts payable and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Financial Instrument [Axis] Financial Instrument [Axis] SEGMENT REPORTING Segment Reporting Disclosure [Text Block] North America North America Segment [Member] North America Segment Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Restricted Stock Restricted Stock [Member] Intangible Assets, Net (Excluding Goodwill) [Abstract] Intangible Assets, Net (Excluding Goodwill) [Abstract] Title Trading Arrangement, Individual Title Unrecognized tax benefits beginning balance Unrecognized tax benefits ending balance Unrecognized Tax Benefits City Area Code City Area Code Current liabilities: Liabilities, Current [Abstract] Auditor Location Auditor Location Consideration payable Business Combination, Contingent Consideration, Liability Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Schedule of Interest Expense Schedule of Interest Expense [Table Text Block] Schedule of Interest Expense Long-term debt, net Long-term debt, net Long-Term Debt, Excluding Current Maturities Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Lease liabilities Operating and Finance Lease, Liability, Current Operating and Finance Lease, Liability, Current Earnings Per Share [Abstract] Earnings Per Share [Abstract] Retained earnings Retained Earnings (Accumulated Deficit) Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Canceled or expired (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] General and administrative General and Administrative Expense 2026 Long-Term Debt, Maturity, Year Two Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Present value of lease liabilities Operating Lease, Liability Underlying Securities Award Underlying Securities Amount Performance Shares Performance Shares [Member] 2029 Finance Lease, Liability, to be Paid, Year Five Amendment Flag Amendment Flag Foreign currency translation loss Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Range of Exercise Price Share Based Compensation Exercisable Range [Abstract] Share Based Compensation Exercisable Range [Abstract] Amortization of acquired intangible assets in cost of revenues Amortization Of Intangible Assets, Cost of Revenue Amortization Of Intangible Assets, Cost of Revenue Accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Number of trade receivables in other marketplaces portfolio segment Number of Trade Receivables in Other Marketplaces Portfolio Segment Number of Trade Receivables in Other Marketplaces Portfolio Segment Amortization of ROU assets Finance Lease, Right-of-Use Asset, Amortization Subsequent Events [Abstract] Subsequent Events [Abstract] Number of shares issued in transaction (in shares) Sale of Stock, Number of Shares Issued in Transaction Debt issuance costs, net Debt Issuance Costs, Net Vehicles Vehicles [Member] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Number of trade receivables in multifamily portfolio Number of Trade Receivables in Multifamily Portfolio Number of Trade Receivables in Multifamily Portfolio Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Total face amount of long-term debt Aggregate principal amount Debt Instrument, Face Amount Accrued wages and commissions Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Wages And Commissions Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Wages And Commissions Technology Technology-Based Intangible Assets [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Advertising costs Advertising Expense Public Offering Public Offering [Member] Public Offering Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Computer hardware and software Computer Hardware And Software [Member] Computer Hardware And Software Deferred stock unit, granted (as a percent) Deferred Stock Unit, Granted Percentage Deferred Stock Unit, Granted Percentage 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] Land and building improvements Land, Buildings and Improvements [Member] Auditor Name Auditor Name Canceled (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 Current: Current Income Tax Expense (Benefit), Continuing Operations [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] Proceeds from sale and settlement of investments Proceeds from Sale, Maturity and Collection of Investments Useful life (in years) Property, Plant and Equipment, Useful Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Exercisable at end of period (in dollars per share) Share-Based Compensation Exercisable Under Stock Option Plans Exercise Price Range The range of exercise prices for purposes of disclosing stock option exercisable at the end of the period and other required information pertaining to stock option plans in the customized range. Deposits and other assets Deposits Assets, Noncurrent Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Accrued expenses Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Expense Excluding Wages And Commissions Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Expense Excluding Wages And Commissions Property and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Foreign currency transaction gain (loss), realized Realized Gain (Loss), Foreign Currency Transaction, before Tax Principal repayments of finance lease obligations Financing cash flows used in finance leases Finance Lease, Principal Payments Amortization of intangible assets Amortization Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] 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] Total assets Total assets Assets Cost of revenues Cost of Goods and Services Sold Advertising Costs Advertising Cost [Policy Text Block] Purchases of property, equipment, and other assets for new campuses Payments to acquire land and building Payments to Acquire Property, Plant, and Equipment Database technology Database Rights [Member] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Stock-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Termination Date Trading Arrangement Termination Date ORGANIZATION Nature of Operations [Text Block] Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] 2026 Lessee, Operating Lease, Liability, to be Paid, Year Two Other assets and liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets And Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets And Liabilities 2025 Long-Term Debt, Maturity, Year One Deferred tax assets: Deferred Tax Assets, Gross [Abstract] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Net income Net income Net income Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Entity File Number Entity File Number Amortization of acquired intangible assets in operating expenses Amortization Of Intangible Assets, Net Of Adjustments Amortization Of Intangible Assets, Net Of Adjustments Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Federal Current Federal Tax Expense (Benefit) Effect of foreign currency exchange rates on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Term of contract (in years) Lessee, 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Erroneous Compensation Amount PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Adjustment to Compensation: Adjustment to Compensation [Axis] Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] 2027 Long-Term Debt, Maturity, Interest Payments, Year Three Long-Term Debt, Maturity, Interest Payments, Year Three Accumulated other comprehensive loss Total accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Deferred commissions Increase (Decrease) Deferred Commissions Increase (Decrease) Deferred Commissions Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Schedule of Property, Plant, and Equipment, Lessor Asset under Operating Lease Property, Plant, and Equipment, Lessor Asset under Operating Lease [Table Text Block] 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Reporting Information [Line Items] All Trading Arrangements All Trading Arrangements [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Schedule of Calculation of Basic and Diluted Net Income Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Vesting period of options and restricted stock grants (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Income tax credit carryforward Tax Credit Carryforward, Amount 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] Operating lease buildings and improvements accumulated depreciation Property, Plant, and Equipment, Lessor Asset under Operating Lease, Accumulated Depreciation Current portion Deferred Income, Current Pay vs Performance Disclosure [Line Items] Peer Group Total Shareholder Return Amount Peer 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Outstanding Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Total operating lease costs Operating Lease, Cost Shares available for future grant under the plan (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Long-term lease liabilities Operating Lease, Liability, Noncurrent Interest on lease liabilities Finance Lease, Interest Expense Deferred revenue Current portion Contract with Customer, Liability, Current Other expense from leasing operations Lessor, Operating Lease, Income (Expense), Net Lessor, Operating Lease, Income (Expense), Net Entity Tax Identification Number Entity Tax Identification Number Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Schedule of Long-term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Increase for prior year tax positions Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Retirement Plan Type [Axis] Retirement Plan Type [Axis] Foreign Deferred Foreign Income Tax Expense (Benefit) Consideration received on transaction Sale of Stock, Consideration Received on Transaction Numerator: Earnings Per Share Reconciliation [Abstract] Plan Name [Axis] Plan Name [Axis] Thereafter Finance Lease, Liability, to be Paid, after Year Five Equity Components [Axis] Equity Components [Axis] Finance lease liabilities Finance Lease, Liability, to be Paid Weighted- average exercise price (in dollars per share) Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price Trade Names Trade name Acquired trade names and other Trade Names [Member] Net income Business Acquisition, Pro Forma Net Income (Loss) Acquisitions, including measurement period adjustments Goodwill, Acquisitions and Adjustments Goodwill, Acquisitions and Adjustments Capitalized contract costs, amortization period (in years) Capitalized Contract Cost, Amortization Period Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Aggregate intrinsic value of options outstanding at end of period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Supplemental non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Software technology Acquired database technology Developed Technology Rights [Member] Geographical [Axis] Geographical [Axis] Credit Loss [Abstract] Net deferred tax assets Deferred Tax Assets, Net 2029 Lessee, Operating Lease, Liability, to be Paid, Year Five Increase in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Selling and marketing (excluding customer base amortization) Selling and marketing (excluding customer base amortization) 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] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Employee stock purchase plan (in shares) Shares of company's common stock purchased during the period (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Income taxes payable Accrued Income Taxes, Noncurrent Multifamily Multifamily Product And Service [Member] Multifamily Online Marketplace [Member] MSPP RSUs MSPP RSUs [Member] MSPP RSUs [Member] Cost of Revenues Cost of Goods and Service [Policy Text Block] Cash and cash equivalents Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Restricted stock grants surrendered Adjustments to Additional Paid in Capital, Restricted Stock Surrendered Adjustments to Additional Paid in Capital, Restricted Stock Surrendered Compensation cost expected to be recognized in future years Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Foreign Current Foreign Tax Expense (Benefit) Current assets: Assets, Current [Abstract] Consolidation Items [Axis] Consolidation Items [Axis] 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] 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 Goodwill [Roll Forward] Goodwill [Roll Forward] Tax reserves Effective Income Tax Rate Reconciliation, Change In Tax Reserves, Amount Effective Income Tax Rate Reconciliation, Change In Tax Reserves, Amount Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Revolving Loans and Letters of Credit Revolving Loans and Letters of Credit [Member] Revolving Loans and Letters of Credit Security Exchange Name Security Exchange Name Basis spread (as a percent) Debt Instrument, Basis Spread on Variable Rate Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Number of Shares Weighted-Average Grant Date Fair Value per Share Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] State Current State and Local Tax Expense (Benefit) Personnel Labor and Related Expense LoopNet LoopNet [Member] LoopNet Operating lease buildings and improvements Property, Plant, and Equipment, Lessor Asset under Operating Lease, before Accumulated Depreciation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Accrued reserve and other Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves Finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Operating lease costs: Operating Lease Cost [Abstract] Operating Lease Cost Common stock, shares issued, (in shares) Common Stock, Shares, Issued Other Assets Other Assets [Member] Income taxes payable, net Increase (Decrease) in Income Taxes Payable Letter of credit sublimit Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Percentage of total revenue (as a percent) Concentration Risk, Percentage DSU DSU [Member] DSU Computer hardware and software Computer Equipment [Member] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Common stock, shares authorized (in shares) Common stock authorized for issuance (in shares) Common Stock, Shares Authorized Cash paid for acquisitions, net of cash acquired Cash paid for acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired $72.05 - $91.98 Exercise Range 5 [Member] The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. Entity Voluntary Filers Entity Voluntary Filers Percentage of purchase price of company's common stock to the market price (as a percent) Percentage of purchase price of company's common stock to the market price The percentage of market price that eligible employees under the plan can purchase company stock. 2024 Credit Agreement, due May 24, 2029 Credit Agreement 2024 [Member] Credit Agreement 2024 Total interest expense Interest Expense, Nonoperating Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Axis] Deferred income taxes, net Deferred Income Tax Expense (Benefit) PROPERTY AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Schedule of Unaudited Pro Forma Financial Information Business Acquisition, Pro Forma Information [Table Text Block] Total other comprehensive (loss) income, net of tax Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Long-term debt principal payments, total Long-Term Debt Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Thereafter Long-Term Debt, Maturity, after Year Five Maximum percentage of employee total compensation matched by employer (as a percent) Defined Contribution Plan, Employer Matching Contribution, Percent of Match Accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current Restricted stock issued Stock Issued During Period, Value, Restricted Stock Award, Gross Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Restricted stock issued (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Document Annual Report Document Annual Report 2027 Finance Lease, Liability, to be Paid, Year Three Range of exercise price, minimum, (in dollars per share) Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Customer base amortization Amortization of Intangible Assets Total deferred revenue Beginning balance Ending balance Contract with Customer, Liability International Non-US [Member] Number of portfolio segments Number of Portfolio Segments Number of Portfolio Segments Accounting Policies [Abstract] Accounting Policies [Abstract] CoStar CoStar [Member] CoStar Suite [Member] Leasehold improvements Leasehold Improvements [Member] ACQUISITIONS Business Combination Disclosure [Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount PEO Name PEO Name Award Type [Domain] Award Type [Domain] 2025 Lessor, Operating Lease, Payment to be Received, Year One Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Stock compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] $53.25 - $72.04 Exercise Range 4 [Member] The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. Revision of Prior Period [Axis] Revision of Prior Period [Axis] Deferred income taxes, net Deferred Income Tax Assets, Net Non-PEO NEO Non-PEO NEO [Member] Useful life (in years) Estimated Useful Life Finite-Lived Intangible Asset, Useful Life Additional Paid-in Capital Additional Paid-in Capital [Member] Long-term lease liabilities Finance Lease, Liability, Noncurrent GOODWILL Goodwill Disclosure [Text Block] Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Abstract] Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Abstract] New deferrals recognized in connection with business acquisitions made Deferred income taxes, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Other adjustments Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] 2028 Finance Lease, Liability, to be Paid, Year Four Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Lease liabilities Increase (Decrease) In Lease Liability Increase (Decrease) In Lease Liability Number of business segments Number of operating segments Number of Operating Segments Income taxes paid Income Taxes Paid New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Accrued capital expenditures and non-cash landlord incentives Capital Expenditures Incurred but Not yet Paid and Noncash Landlord Incentives Capital Expenditures Incurred but Not yet Paid and Noncash Landlord Incentives Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Indefinite-lived intangible assets, written off Indefinite-lived Intangible Assets, Written off Indefinite-lived Intangible Assets, Written off Total deferred tax assets, net of valuation allowance Deferred Tax Assets, Net of Valuation Allowance Stated interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Supplemental cash flow disclosures: Supplemental Cash Flow Information [Abstract] Leasing Operations and Other Income, Expense Lessor, Leases [Policy Text Block] Capitalized research and development costs Deferred Tax Asset, In-Process Research and Development Compensation Related Costs [Abstract] Compensation Related Costs [Abstract] Number of trade receivables in loopnet portfolio Number of Trade Receivables in Loop Net Portfolio Number of Trade Receivables in Loop Net Portfolio Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Auditor Firm ID Auditor Firm ID Long-term deferred tax assets Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Income from operations Operating Income (Loss) Variable Rate [Domain] Variable Rate [Domain] Increase (decrease) in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Number of reportable segments Number of Reportable Segments Total liabilities and stockholders’ equity Liabilities and Equity SUBSEQUENT EVENTS Subsequent Events [Text Block] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Impairment loss Operating Lease, Impairment Loss 2026 Finance Lease, Liability, to be Paid, Year Two Proceeds from exercise of stock options and employee stock purchase plan Proceeds From Exercise Of Stock Options and ESPP The cash inflow associated with the amount received from holders exercising their stock options and participants of employee stock purchase plans. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Exercised (in dollars per share) Share-Based Compensation Shares Exercised Under Stock Option Plans Exercise Price Range The range of exercise prices for purposes of disclosing stock option exercised and other required information pertaining to stock option plans in the customized range. Schedule of Commissions Expense Capitalized Contract Cost [Table Text Block] Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Underlying Security Market Price Change Underlying Security Market Price Change, Percent Number of classes of trade receivables based on location Number of Classes of Trade Receivables Based on Location Number of Classes of Trade Receivables Based on Location Individual: Individual [Axis] Building and Improvements Building and Building Improvements [Member] Management stock purchase plan Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Liabilities incurred Business Combination, Consideration Transferred, Liabilities Incurred Expected life (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Product and Service [Axis] Product and Service [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Statement [Line Items] Statement [Line Items] Schedule of Reconciliation of Net Income to EBITDA Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Operating expenses: Operating Expenses [Abstract] Fair value of identifiable net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Schedule of Property and Equipment Property, Plant and Equipment [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Aggregate purchase price Business Combination, Consideration Transferred 2029 Long-Term Debt, Maturity, Interest Payments, Year Five Long-Term Debt, Maturity, Interest Payments, Year Five Software development Software development Software Development [Member] Allowance for Credit Losses Credit Loss, Financial Instrument [Policy Text Block] Senior Notes unamortized discount and issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Non-current portion Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Minimum Minimum [Member] Adoption Date Trading Arrangement Adoption Date Non-current portion Contract with Customer, Liability, Noncurrent Credit loss expense Accounts Receivable, Credit Loss Expense (Reversal) Segments [Axis] Segments [Axis] 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] Revenue Business Acquisition, Pro Forma Revenue Total commissions expense Capitalized Contract Costs Capitalized Contract Costs Lease and other long-term liabilities Lease and Other Liabilities, Noncurrent Lease and Other Liabilities, Noncurrent Exercise Price Award Exercise Price Potential merger termination fee Business Combination, Fee Upon Merger Termination Business Combination, Fee Upon Merger Termination Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Asset Acquisition [Table] Asset Acquisition [Table] Arrangement Duration Trading Arrangement Duration Net operating loss carryforward Operating Loss Carryforwards LEASES Lessee, Finance Leases [Text Block] Domestic Country Domestic Tax Jurisdiction [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Amortization expense for 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Four Present value of lease liabilities Finance Lease, Liability All Individuals All Individuals [Member] 2020 Credit Agreement, due July 1, 2025 2020 Credit Agreement [Member] 2020 Credit Agreement CoStar Group, Inc. 2007 Stock Incentive Plan CoStar Group, Inc. 2007 Stock Incentive Plan [Member] Employee stock incentive plan name. Buildings Buildings Building [Member] Change in Contract with Customer, Liability [Roll Forward] Change in Contract with Customer, Liability [Roll Forward] Change in Contract with Customer, Liability [Roll Forward] 2025 Long-Term Debt, Maturity, Interest Payments, Year One Long-Term Debt, Maturity, Interest Payments, Year One Variable Rate [Axis] Variable Rate [Axis] International International Segment [Member] International Segment Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Debt outstanding, fair value Debt Instrument, Fair Value Disclosure Other (expense) income, net Other Nonoperating Income (Expense) Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Intangible assets, net Intangible Assets, Net (Excluding Goodwill) $37.03 - $53.24 Exercise Range 3 [Member] The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. Nondeductible compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Compensation, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Compensation, Amount Less: Expenses [Abstract] Expenses Subscription-Based Contracts Subscription-Based Contracts [Member] Subscription-Based Contracts Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract] Other Marketplaces Other Marketplaces [Member] Other Marketplaces Transaction costs Business Acquisition, Transaction Costs Furniture and office equipment Furniture And Office Equipment [Member] Furniture And Office Equipment Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Net income per share - diluted (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Matterport Matterport [Member] Matterport Deferred sales commissions of impaired Capitalized Contract 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