Less: Accumulated amortization on amortizable intangibles Finite-Lived Intangible Assets, Accumulated Amortization Award Timing Predetermined Award Timing Predetermined [Flag] Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets [Axis] Entity File Number Entity File Number Additional Paid-In Capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Purchase of short-term investments Payments to Acquire Short-Term Investments 2023 Grants 2023 Grants [Member] 2023 Grants Real estate agent commissions expense Commissions, Policy [Policy Text Block] Maximum exposure on guarantees Guarantor Obligations, Maximum Exposure, Undiscounted Property management revenue Property Management Income [Member] Property Management Income [Member] Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Stock dividend (in percent) Dividends, Common Stock, Stock, Percentage Dividends, Common Stock, Stock, Percentage RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] Interest rate Measurement Input, Inception Discount Rate [Member] Total Gains (Losses) Fair Value, Option, Changes in Fair Value, Gain (Loss) Intangible Asset, Indefinite-Lived [Table] Intangible Asset, Indefinite-Lived [Table] Distributions and dividends on common stock (in shares) Common Stock Dividends And Distributions, Shares Common Stock Dividends And Distributions, Shares Current Total Current Income Tax Expense (Benefit) Adjustment to Compensation, Amount Adjustment to Compensation Amount Basis of Presentation Consolidation, Policy [Policy Text Block] Non-cash stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Other income Investment Income, Other Investment Income, Other Employee Stock Option Share-Based Payment Arrangement, Option [Member] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Revenue recognition Deferred Tax Liabilities, Financing Arrangements Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] Impairment of fixed assets Asset Impairment Charges Total Douglas Elliman Inc. stockholders' equity Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] Insider Trading Policies and Procedures [Line Items] Schedule of Property and Equipment, net Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Recurring Fair Value, Recurring [Member] Significant Concentrations of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] LIABILITIES AND STOCKHOLDERS' EQUITY: Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Assumed annual stock dividend Measurement Input Stock Dividend [Member] Measurement Input Stock Dividend Maximum Maximum [Member] Useful Lives in Years Finite-Lived Intangible Asset, Useful Life Net loss attributed to non-controlling interest Net Income (Loss) Attributable to Noncontrolling Interest Intangibles with a finite life, net Beginning balance Ending balance Other intangibles, net Finite-Lived Intangible Assets, Net Restricted Stock Restricted Stock [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Real estate broker agent receivables Real Estate Broker Agent Receivables [Member] Real Estate Broker Agent Receivables [Member] Income (loss) before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Southeast US Southeast Region [Member] Schedule of Fair Value of Notes Payable Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Commercial leasing contracts extended payment term (in months) Commercial Leasing Contracts, Extended Payment Term Commercial Leasing Contracts, Extended Payment Term Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Schedule of Income Taxes Paid, Net of Refunds, by Jurisdiction Schedule of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Other intangible assets, net Other Intangible Assets, Net Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Severance liability beginning balance Severance liability ending balance Restructuring Reserve Lease termination term (in years) Lessee, Lease, Termination Period Lessee, Lease, Termination Period Schedule of Debt Interest Expense Schedule of Interest Expense [Table Text Block] Schedule of Interest Expense Current operating lease liabilities Operating Lease, Liability, Current Nontaxable or Nondeductible Items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent [Abstract] Real estate agent commissions Real Estate Agent Commissions [Member] Real Estate Agent Commissions Document Fiscal Period Focus Document Fiscal Period Focus Receivables Receivable [Policy Text Block] Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Contingent payments Litigation Settlement, Amount Contingently Awarded to Other Party Litigation Settlement, Amount Contingently Awarded to Other Party Award Type [Axis] Award Type [Axis] Contract liabilities Contract liabilities, which are in other liabilities Contract with Customer, Liability, Noncurrent Investment, Name [Domain] Investment, Name [Domain] Stock Awards Share-Based Payment Arrangement [Policy Text Block] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Changes in Valuation Allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Schedule of Goodwill and Other Intangible Assets Schedule of Intangible Assets and Goodwill [Table Text Block] Entity Address, City or Town Entity Address, City or Town Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Net deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Purchase price Business Combination, Consideration Transferred Entity Emerging Growth Company Entity Emerging Growth Company 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] Total revenues Revenue from Contract with Customer, Including Assessed Tax Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Trademark - Douglas Elliman Indefinite-Lived Intangible Assets (Excluding Goodwill) Weighted average remaining lease term in years: Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term [Abstract] Common stock, shares outstanding (in shares) Beginning Balance (in shares) Ending Balance (in shares) Common Stock, Shares, Outstanding Current Period Provision Accounts Receivable, Credit Loss Expense (Reversal) Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Legal Fees Legal Fees Weighted average discount rate: Weighted Average Discount Rate [Abstract] Weighted Average Discount Rate [Abstract] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] 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Recurring Basis, Asset Value Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Property and equipment, gross Property, Plant and Equipment, Gross Purchase of long-term investments Payments to Acquire Long-Term Investments Distributions and Dividends on Common Stock Stockholders' Equity, Policy [Policy Text Block] Non-cash lease expense Operating Lease, Right-of-Use Asset, Periodic Reduction Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] U.S. Federal Income Tax Paid, Federal, after Refund Received All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total 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[Member] Less: Sublease income Sublease Income Loans and Leases Receivable Disclosure [Table] Loans and Leases Receivable Disclosure [Table] Restricted stock grants Stock Issued During Period, Value, Restricted Stock Award, Gross Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Expenses: Operating expenses: Operating Costs and Expenses [Abstract] Number of reportable segments Number of Reportable Segments Deferred tax assets: Components of Deferred Tax Assets [Abstract] Other restructuring expense Other Restructuring Costs Entity Address, State or Province Entity Address, State or Province Compensation related items Effective Income Tax Rate Reconciliation, Nondeductible Officers' Compensation, Percent Effective Income Tax Rate Reconciliation, Nondeductible Officers' Compensation, Percent Fair value of the derivative embedded within convertible debt Embedded Derivative, Fair Value of Embedded Derivative Debt Embedded Derivative, Fair Value of Embedded Derivative Debt Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Total current liabilities Liabilities, Current Restricted stock grant (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Individual: Individual [Axis] 401 (k) plan cost recognized Defined Contribution Plan, Cost Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Dividends on common stock Payments of Ordinary Dividends, Common Stock Document Annual Report Document Annual Report Number of plans Defined Contribution Plan, Number Defined Contribution Plan, Number Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Non-controlling interest (in percent) Subsidiary, Ownership Percentage, Noncontrolling Owner Entity Interactive Data Current Entity Interactive Data Current Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Schedule of Restricted Stock Award Transactions Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Various U.S. federal and state tax loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards CURRENT EXPECTED CREDIT LOSSES Allowance for Credit Losses [Text Block] Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Ownership [Domain] Ownership [Domain] Balance at Beginning of Period Balance at End of Period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Other assets Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name 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] Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Beginning balance of derivative liability fair value Ending balance of derivative liability fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Contract liabilities Contract with Customer, Liability, Current Nontaxable or Nondeductible Items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount [Abstract] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Total compensation cost not yet recognized Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Lease renewal term (in years) Lessee, Lease, Renewal Term Lessee, Lease, Renewal Term U.S. Federal Statutory Tax Rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Base purchase price Disposal Group, Including Discontinued Operation, Consideration Notes payable and other obligations less current portion Long-Term Debt, Excluding Current Maturities Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Axis] Other intangibles Finite-Lived Intangible Assets, Gross 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] Entity Address, Address Line One Entity Address, Address Line One Difference between net carrying amount and fair value Gain (Loss) on Extinguishment of Debt, before Debt Issuance Cost Writeoff Withholding of shares as payment of tax liabilities in connection with restricted stock vesting (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Ownership [Axis] Ownership [Axis] Fair Value as of Grant Date Award Grant Date Fair Value NOL carryforwards Operating Loss Carryforwards Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Related Party Transaction [Line Items] Related Party Transaction [Line Items] Deferred income taxes Deferred Income Taxes and Tax Credits Schedule of Unobservable Inputs Related to the Valuations of the Level 3 Liabilities Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] Total investments Investments Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Contract liabilities increase Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress Non-PEO NEO Non-PEO NEO [Member] Outstanding letters of credit Letters of Credit Outstanding, Amount Operating lease right-of-use assets Deferred Tax Liabilities, Leasing Arrangements Interest income Interest Income, Other Douglas Elliman Douglas Elliman Inc. [Member] Douglas Elliman Inc. Other intangibles Other Intangible Assets [Member] Award Type [Domain] Award Type [Domain] Payment for debt extinguishment costs Payment for Debt Extinguishment or Debt Prepayment Cost Fair value of the derivative embedded within convertible debt Fair value of the derivative embedded within convertible debt Embedded Derivative, Fair Value of Embedded Derivative Liability 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Commission and other brokerage income - existing home sales Commission and Other Brokerage Income, Existing Home Sales [Member] Commission and Other Brokerage Income, Existing Home Sales Non-controlling interest Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Leasehold improvements Leasehold Improvements [Member] Advertising costs Advertising Expense Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Litigation settlement expense Litigation Settlement, Fee Expense Certificates of deposit Certificates of Deposit [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Revenue recognized on contract liabilities Contract with Customer, Liability, Revenue Recognized Accrued salary and benefits Increase (Decrease) in Employee Related Liabilities Additions Charged to Costs and Expenses SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Schedule of Investments [Line Items] Schedule of Investments [Line Items] Schedule of Rollforward of Allowance for Credit Losses Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Remaining lease terms (in years) Lease, Remaining Lease Term Lease, Remaining Lease Term Revenues: Revenues [Abstract] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Sales and marketing Selling and Marketing Expense Financial Instruments [Domain] Financial Instruments [Domain] Net deferred tax liabilities Deferred Tax Liabilities, Gross Award Date [Domain] Award Date [Domain] Schedule of Intangible Asset and Contract Liabilities Assumed Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Performance Shares Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Income attributable to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted Company Selected Measure Name Company Selected Measure Name Gibson And Umpa Gibson And Umpa [Member] Gibson And Umpa Contract liability advance payments received from customer Contract with Customer, Liability, Advance Payments, Net Contract with Customer, Liability, Advance Payments, Net Fair Value Measurement [Domain] Fair Value Measurement [Domain] NOTES PAYABLE AND OTHER OBLIGATIONS Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Operating cash flows from operating leases Operating Lease, Payments Douglas Elliman Texas Douglas Elliman Texas [Member] Douglas Elliman Texas Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Net income (loss) available to common stockholders attributed to Douglas Elliman Inc. Net Income (Loss) Available to Common Stockholders, Diluted Goodwill Goodwill [Roll Forward] Restructuring Plan [Domain] Restructuring Plan [Domain] Operating lease liabilities Deferred Tax Assets, Operating Lease Liability Deferred Tax Assets, Operating Lease Liability Weighted-average shares for diluted EPS (in shares) Weighted Average Number of Shares Outstanding, Diluted Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Entity Small Business Entity Small Business Voting interest acquired (in percent) Business Combination, Voting Equity Interest Acquired, Percentage Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] State and local Current State and Local Tax Expense (Benefit) Document Transition Report Document Transition Report Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Subsequent Events Subsequent Events, Policy [Policy Text Block] INCOME TAXES Income Tax Disclosure [Text Block] Allowance for bad debt Estimated credit losses Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Schedule of Investments [Table] Schedule of Investments [Table] Short-term lease cost Short-Term Lease, Cost Operating right-of-use assets and operating lease liabilities, net Increase (Decrease) in Operating Lease Liability Total stockholders' equity Beginning Balance Ending Balance Equity, Including Portion Attributable to Noncontrolling Interest Antitrust litigation settlement Estimated Litigation Liability, Noncurrent Document Type Document Type Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] EARNINGS (LOSS) PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Additional paid-in capital Additional Paid in Capital Product and Service [Axis] Product and Service [Axis] Number of shared board members Related Party, Number Of Shared Board Members Related Party, Number Of Shared Board Members Antitrust litigation settlement expense Litigation Settlement, Loss Variable lease cost Variable Lease, Cost Total revenues Revenue from Contract with Customer, Excluding Assessed Tax Litigation Status [Domain] Litigation Status [Domain] Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Development marketing project period (in years) Development Marketing Project, Term Development Marketing Project, Term Net income (loss) available to common stockholders attributed to Douglas Elliman Inc. Net Income (Loss) Available to Common Stockholders, Basic Net unrealized (losses) gains on long-term investments at fair value Net unrealized (losses) gains on long-term investments at fair value Alternative Investments, Gain (Loss) Alternative Investments, Gain (Loss) Operations and support expenses Operations and Support Expenses [Policy Text Block] Operations and Support Expenses Current liabilities: Liabilities, Current [Abstract] Gain on disposal of business Gain (Loss) on Disposition of Assets Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Related Party Transaction [Table] Related Party Transaction [Table] Net loss applicable to common shares attributed to Douglas Elliman Inc.(in dollars per share) Earnings Per Share, Diluted Receivables Accounts Receivable, after Allowance for Credit Loss, Current Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] U.S. State and local Income Tax Paid, State and Local, after Refund Received Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Auditor Location Auditor Location EQUITY-METHOD INVESTMENTS Equity Method Investments and Joint Ventures Disclosure [Text Block] Cash paid for amounts included in measurement of lease liabilities: Cash Flow, Lessee [Abstract] Cash Flow, Lessee [Abstract] Other Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Other Stockholders' Equity, Other Douglas Elliman Property Management Douglas Elliman Property Management [Member] Douglas Elliman Property Management Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Number of defendants Loss Contingency, Number of Defendants Income taxes, net Income taxes, net Income Taxes Paid, Net Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Beneficial owner (more than) Investor [Member] Convertible Notes, net of unamortized discount of $0 and $17,330 Long-Term Debt, Gross Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Accrued salaries and benefits Employee-related Liabilities, Current PROPERTY AND EQUIPMENT, NET Property, Plant and Equipment Disclosure [Text Block] Total lease payments Lessee, Operating Lease, Liability, to be Paid Subsidiaries Subsidiaries [Member] Non-cash interest expense Noncash Interest Expense Noncash Interest Expense Expiration Date Trading Arrangement Expiration Date Antitrust litigation settlement expense Litigation Settlement, Loss [Member] Litigation Settlement, Loss Net income attributable NCI in DE Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Related party transaction, amounts of transaction Related Party Transaction, Amounts of Transaction Stockholders' equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Schedule of Equity Method Investments Equity Method Investments [Table Text Block] Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Restructuring Severance expense Restructuring Charges Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Restructuring Cost [Table] Restructuring Cost [Table] Entity Current Reporting Status Entity Current Reporting Status Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Consolidated Entities [Domain] Consolidated Entities [Domain] U.S. Federal Statutory Tax Rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Binomial Lattice Model Valuation Technique Binomial Lattice Model [Member] Valuation Technique Binomial Lattice Model Implied credit spread Measurement Input, Entity Credit Risk [Member] Loss on sale of assets Gain (Loss) on Disposition of Property Plant Equipment Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Net gains on long-term investment securities without a readily determinable fair value that does not qualify for the NAV practical expedient Gain (Loss) On Equity Securities Without Readily Determinable Fair Value Gain (Loss) On Equity Securities Without Readily Determinable Fair Value Repayments of debt Repayments of Debt SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] State and local income taxes, net of federal income tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Basis differences on acquisition Deferred Tax Liabilities, Unrealized Gains on Trading Securities Proceeds from debt issuance Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Shares available for issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Effect of stock dividend (in shares) Common Stock Dividends, Shares Weighted-average number of shares issuable upon conversion of debt (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Less PropTech current convertible trading debt securities Debt Securities, Current LEASES Lessee, Operating Leases [Text Block] Net cash (used in) provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Number of offices Number of Office Locations Number of Office Locations Provision for credit losses Financing Receivable, Credit Loss, Expense (Reversal) Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Costs related to sales Expenses from transactions with related party Cost of Product and Service Sold Disposal Group Classification [Domain] Disposal Group Classification [Domain] Change in contract assets Contract with Customer, Asset, Reclassified to Receivable Other ancillary services Other Ancillary Services [Member] Other Ancillary Services Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Operations and support Operations And Support [Member] Operations And Support Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Discounted cash flow Valuation Technique, Discounted Cash Flow [Member] Schedule of Basic and diluted EPS calculation shares Schedule of Weighted Average Number of Shares [Table Text Block] Common stock, shares issued (in shares) Common Stock, Shares, Issued Operating leases Operating Lease, Weighted Average Remaining Lease Term 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Party Restructuring Costs Associated with Exit or Disposal Activity or Restructuring [Policy Text Block] Northeast US Northeast Region [Member] Disposal group, including discontinued operation, finite-lived agreements, period (in years) Disposal Group, Including Discontinued Operation, Finite-Lived Agreements, Period Disposal Group, Including Discontinued Operation, Finite-Lived Agreements, Period Schedule of Company's Recurring Financial Assets and Liabilities Subject to Fair Value Measurements Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Insider Trading Arrangements [Line Items] Other restructuring payments Other Restructuring Payments Other Restructuring Payments Total liabilities Liabilities Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Investment and other gains Investment and other gains Investment Income, Net Pension Adjustments Prior Service Cost Pension 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