Unobservable input - revenue retention volatility - maximum Unobservable input - revenue retention volatility - maximum Unobservable input - revenue retention volatility - maximum Variable Interest Entities Consolidated Entities [Axis] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest Statistical Measurement [Domain] Statistical Measurement [Domain] Debt Securities, Trading, Gain (Loss) [Abstract] Debt Securities, Trading, Gain (Loss) [Abstract] Change in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Salient MLP Total Return TE Fund, L.P. Salient MLP Total Return TE Fund, L.P. [Domain] Salient MLP Total Return TE Fund, L.P. Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Equity Award Award Type [Domain] Nonvested restricted shares Non-vested, beginning balance, shares Non-vested, ending balance, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Impairment of Intangible Assets (Excluding Goodwill) Impairment of Intangible Assets (Excluding Goodwill) Members' Equity Attributable to Noncontrolling Interest Members' Equity Attributable to Noncontrolling Interest Estimated Fair Value Total assets measured at fair value Debt Securities, Trading, and Equity Securities, FV-NI Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Investment Balances Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Performance Shares [Member] Performance Shares [Member] Segment Reporting [Abstract] Segment Reporting [Abstract] Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Income taxes payable Increase (Decrease) in Accrued Taxes Payable Payments to Acquire Investments Payments to Acquire Investments Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Other Revenue, Net Other Revenue, Net Other Revenue, Net Unobservable input - growth discount rate - maximum Unobservable input - growth discount rate - maximum Unobservable input - growth discount rate - maximum Commitments and contingencies Commitments and Contingencies Business Combination, Step Acquisition, Equity Interest in Acquiree, Description Business Combination, Step Acquisition, Equity Interest in Acquiree, Description Target [Domain] Target [Domain] [Domain] for Target [Axis] Accrued stock repurchases Accrued Stock Repurchases Accrued Stock Repurchases Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] STOCKHOLDERS' EQUITY Equity [Text Block] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document and entity information. Geographical [Axis] Geographical [Axis] Service period of mutual fund share incentive award Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period Variable Interest Entities Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] (Deprecated 2020) Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Issuance of restricted stock, net of forfeitures, shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Revenue [Policy Text Block] Revenue [Policy Text Block] Geographic Distribution [Domain] Geographic Distribution [Domain] Current liabilities: Liabilities, Current [Abstract] Eliminations Intersegment Eliminations [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Unobservable input - growth volatility - weighted average Unobservable input - growth volatility - weighted average Unobservable input - growth volatility - weighted average Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Diluted (dollars per share) Earnings Per Share, Diluted Schedule of Investments [Table] Schedule of Investments [Table] Net change in unrealized appreciation (depreciation) on private investments Unrealized Gain (Loss) on Investments Treasury stock, at cost - 2,715,977 shares at September 30, 2023; 2,645,713 shares at December 31, 2022 Treasury Stock, Value Treasury Stock, Value Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current SUPPLEMENTAL CASH FLOW INFORMATION: Supplemental Cash Flow Elements [Abstract] Restricted Stock Award, Forfeitures Restricted Stock Award, Forfeitures Business combination, consideration transferred for Broadmark Business combination, consideration transferred for Broadmark Business combination, consideration transferred for Broadmark Level 3 Fair Value, Inputs, Level 3 [Member] Information technology Communications and Information Technology stock repurchase authorization - subsequent event stock repurchase authorization - subsequent event stock repurchase authorization - authorization subsequent to financial statement date Trust Trust for Benefit of Employees [Member] Trading Symbol Trading Symbol Cost Debt Securities, Trading, Amortized Cost Total Total [Member] Total Net Income (Loss) Attributable to Parent Net Income (Loss) Total current liabilities Liabilities, Current Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] LEASES Lessee, Operating Leases [Text Block] Net intersegment revenues Net Intersegment Revenues Net intersegment revenues. Subsequent Event, Description Subsequent Event, Description LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Stock Repurchased During Period, Value Stock Repurchased During Period, Value INVESTMENTS Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Stockholders' Equity: Equity, Attributable to Parent [Abstract] Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Proceeds from Sale of Productive Assets Proceeds from Sale of Productive Assets Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Restricted shares subject only to a service condition: Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Unobservable input -book value multiple - weighted average Unobservable input -book value multiple - weighted average Unobservable input -book value multiple - weighted average Significant Accounting Policies Significant Accounting Policies [Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Amount at Risk Risk Of Loss The risk of loss on Investment in VIE. Earnings per share: Earnings Per Share, Basic and Diluted [Abstract] (Deprecated 2022) Goodwill Goodwill Equity Components Equity Components [Axis] Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized Investments carried at fair value, unrealized loss Investments carried at fair value, unrealized loss Investments carried at fair value, unrealized loss Shares remain available for issuance Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Investment Type [Axis] Investment Type [Axis] Disaggregation of Revenue [Abstract] Disaggregation of Revenue [Abstract] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Entity Small Business Entity Small Business Investments [Domain] Investments [Domain] Private equity Private Equity Investments [Member] Private Equity Investments [Member] Local Phone Number Local Phone Number Accounts receivable Increase (Decrease) in Accounts Receivable Tax Adjustments, Settlements, and Unusual Provisions Tax Adjustments, Settlements, and Unusual Provisions Accounts Receivable Accounts Receivable [Member] Dividends declared per share (dollars per share) Common Stock, Dividends, Per Share, Declared Westwood Hospitality Fund I LLC [Member] Westwood Hospitality Fund I LLC [Member] Westwood Hospitality Fund I LLC [Member] Operating Lease, Liability, Noncurrent Operating Lease, Liability, Noncurrent Status and Changes in Restricted Stock Grants that Subject to Service Condition Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Depreciation Depreciation Variable Interest Entity, Consolidated, Assets, Noncurrent Variable Interest Entity, Consolidated, Assets, Noncurrent (Deprecated 2020) Amount of consolidated variable interest entity's (VIE) assets classified as noncurrent. Income Statement Location Income Statement Location [Axis] Unobservable input - growth discount rate - minimum Unobservable input - growth discount rate - minimum Unobservable input - growth discount rate - minimum Europe [Member] Europe [Member] Foreign Currency Translation Adjustment, Description Foreign Currency Translation Adjustment, Description Consolidation, Variable Interest Entity, Policy [Policy Text Block] Consolidation, Variable Interest Entity, Policy [Policy Text Block] Total revenues Revenues Income taxes payable Accrued Income Taxes, Current Product and Service [Domain] Product and Service [Domain] Mutual Fund Advisory [Member] Mutual Fund Advisory [Member] [Member] Mutual Fund Advisory [Member] [Member] Shares Issued, Shares, Share-based Payment Arrangement, Forfeited Shares Issued, Shares, Share-Based Payment Arrangement, Forfeited Anti-dilutive restricted shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Award Type Award Type [Axis] Due from related party Due from Related Parties (Deprecated 2023) Granted (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Plan Name [Domain] Plan Name [Domain] Document Quarterly Report Document Quarterly Report Income Taxes Receivable, Current Income Taxes Receivable, Current Remaining unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Accrued purchase of property and equipment Capital Expenditures Incurred but Not yet Paid Dividends declared Dividends, Common Stock Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Total number of shares that may be issued under the stock based compensation Plan (including predecessor plans to the Plan) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Adjustments to Additional Paid in Capital, Other Adjustments to Additional Paid in Capital, Other RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Entity File Number Entity File Number Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Proceeds from Sale of Debt and Equity Securities, FV-NI, Held-for-investment Proceeds from Sale, Debt Security, Trading, and Equity Security, FV-NI, Held-for-Investment Operating Lease, Liability, Current Operating Lease, Liability, Current Long-term Investments Carried at Fair Value Long-term Investments Carried at Fair Value Long-term Investments Carried at Fair Value Amortization of intangible assets Amortization of Intangible Assets Entity Shell Company Entity Shell Company Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Long-term Investments Long-Term Investments Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Intangible assets, net Finite-Lived Intangible Assets, Net Treasury Stock Acquired, Average Cost Per Share Shares Acquired, Average Cost Per Share Fee revenues from Westwood VIEs Variable Interest Entity, Measure of Activity, Revenues Counterparty Name [Domain] Counterparty Name [Domain] Other liabilities Increase (Decrease) in Other Operating Liabilities Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Asset Class [Axis] Asset Class [Axis] Institutional Institutional [Member] Institutional. Restricted Stock, Value, Shares Issued Net of Tax Withholdings Restricted Stock, Value, Shares Issued Net of Tax Withholdings Weighted average shares outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Common stock, shares issued Common Stock, Shares, Issued Vested (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Business Combination, Consideration Transferred Business Combination, Consideration Transferred Severance Costs Severance Costs Treasury Stock, Common, Value Treasury Stock, Common, Value Security Exchange Name Security Exchange Name Long-term Investments Carried at Fair Value using NAV Long-term Investments Carried at Fair Value using NAV Long-term Investments Carried at Fair Value using NAV Remaining unrecognized compensation cost recognized over a remaining weighted average period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Total expenses Costs and Expenses Asset Acquisition [Table] Asset Acquisition [Table] Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent UCITS Fund Undertaking For Collective Investment In Transferable Securities [Member] Undertaking for collective investment in transferable securities. Net (purchases) sales of trading securities Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI Document Type Document Type Goodwill, Acquired During Period Goodwill, Acquired During Period Entity Address, Address Line One Entity Address, Address Line One Treasury Stock, Value, Acquired, Cost Method Treasury Stock, Value, Acquired, Cost Method Share Based Compensation Arrangement By Share Based Payment Award Available For Grant, Original Share Based Compensation Arrangement By Share Based Payment Award Available For Grant, Original Share Based Compensation Arrangement By Share Based Payment Award Available For Grant, Original Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Subsequent Event [Table] Subsequent Event [Table] Employee Benefit and Share-based Payment Arrangement, Noncash Expense [Abstract] Employee Benefit and Share-Based Payment Arrangement, Noncash Expense [Abstract] Noncontrolling Interest, Ownership Percentage by Parent Subsidiary, Ownership Percentage, Parent Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Equity Securities, FV-NI, Gain (Loss) [Abstract] Equity Securities, FV-NI, Gain (Loss) [Abstract] Equity Securities, FV-NI, Unrealized Loss Equity Securities, FV-NI, Unrealized Loss Subsequent Event [Member] Subsequent Event [Member] Broadmark Asset Management LLC Broadmark Asset Management LLC [Domain] Broadmark Asset Management LLC Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Income Statement [Abstract] Income Statement [Abstract] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Revenue from Contract with Customer, Including Assessed Tax Revenue from Contract with Customer, Including Assessed Tax EXPENSES: Costs and Expenses [Abstract] Title of 12(b) Security Title of 12(b) Security Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Asset Acquisition [Line Items] Asset Acquisition [Line Items] Sublease Income Sublease Income Related Party Related Party, Type [Domain] Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition, Pro Forma Net Income (Loss) Operating Segments Operating Segments [Member] Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable Non-vested, beginning balance, (dollars per share) Non-vested, ending balance, (dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Dividends payable Dividends Payable, Current Other current assets Other Assets, Current Investments carried at fair value, unrealized gain Investments carried at fair value, unrealized gain Investments carried at fair value, unrealized gain Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] VIE Variable Interest Entity [Member] Variable interest entity. Share repurchase - open market total amount Share repurchase - open market total amount Share repurchase - open market total amount Entity Tax Identification Number Entity Tax Identification Number Equity Method Investments Equity Method Investments Trust performance-based Trust performance-based [Member] Trust performance-based Statistical Measurement [Axis] Statistical Measurement [Axis] Other current assets Increase (Decrease) in Other Current Assets Entity Interactive Data Current Entity Interactive Data Current Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Fair Value Inputs [Abstract] (Deprecated 2018-01-31) Fair Value Inputs [Abstract] (Deprecated 2018-01-31) Purchases of treasury stock Amount of shares purchased in the open market Payments for Repurchase of Common Stock Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Other Assets Other Assets [Member] Segment [Domain] Segments [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Consolidation Items [Domain] Consolidation Items [Domain] Retained earnings (accumulated deficit) Retained Earnings (Accumulated Deficit) Performance-based fees [Member] performance fee [Member] performance fee [Member] Asset Acquisition, Contingent Consideration, Liability Asset Acquisition, Contingent Consideration, Liability Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Current Assets: Assets, Current [Abstract] Leases [Abstract] Leases [Abstract] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) Entity Address, State or Province Entity Address, State or Province Counterparty Name [Axis] Counterparty Name [Axis] Net fee revenues from external sources Revenue From External Sources Revenue From External Sources Cost Method Investments Cost Method Investments (Deprecated 2023) Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Schedule Of Related Party Transactions By Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Mutual Fund Share Incentive Awards Mutual Fund Share Incentive Awards [Member] Mutual Fund Share Incentive Awards Common stock, shares outstanding BALANCE, shares BALANCE, shares Common Stock, Shares, Outstanding Operating Lease, Impairment Loss Operating Lease, Impairment Loss Unobservable input - revenue retention discount rate - weighted average Unobservable input - revenue retention discount rate - weighted average Unobservable input - revenue retention discount rate - weighted average Treasury Stock, Value, Acquired, Par Value Method Treasury Stock, Value, Acquired, Par Value Method Asset Class [Domain] Asset Class [Domain] Scenario [Axis] Target [Axis] Target [Axis] Schedule Of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Common stock, par value (dollars per share) Common Stock, Par or Stated Value Per Share Investments in securities: Investments, Fair Value Disclosure [Abstract] Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Investing Activities Estimated Fair Value Private Equity Securities, FV-NI, Current Dilutive potential shares from unvested restricted shares (shares) Incremental Common Shares Attributable To Nonvested Restricted Shares Incremental common shares attributable to nonvested restricted shares. Professional services Professional Fees Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Goodwill, Period Increase (Decrease) Goodwill, Period Increase (Decrease) Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Investment Owned, at Fair Value Investment Owned, Fair Value Total liabilities Liabilities Related Party Transaction, Expenses from Transactions with Related Party Related Party Transaction, Expenses from Transactions with Related Party (Deprecated 2023) Vesting [Domain] Vesting [Domain] AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage Cash Acquired in Excess of Payments to Acquire Business Cash Acquired in Excess of Payments to Acquire Business Unobservable input - growth discount rate - weighted average Unobservable input - growth discount rate - weighted average Unobservable input - growth discount rate - weighted average Debt Securities, Trading, Unrealized Loss Debt Securities, Trading, Unrealized Loss Plan Name [Axis] Plan Name [Axis] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Canada CANADA Number of operating segments Number of Reportable Segments Other Revenue Misc Services [Member] Other Revenue Misc Services [Member] Other Revenue Misc Services [Member] Earnings (loss) per share: Earnings Per Share [Abstract] Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Subsequent Event [Line Items] Subsequent Event [Line Items] Sales and marketing Selling and Marketing Expense Common stock, $0.01 par value, authorized 25,000,000 shares, issued 11,896,172 and outstanding 9,180,195 shares at September 30, 2023; issued 11,527,544 and outstanding 8,881,831 shares at December 31, 2022 Common Stock, Value, Issued General and administrative General and Administrative Expense Investments Measured at NAV Fair Value Measured at Net Asset Value Per Share [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Fees earned from related party Revenue from Related Parties (Deprecated 2023) Unobservable input -book value multiple - minimum Unobservable input -book value multiple - minimum Unobservable input -book value multiple - minimum Total current assets Assets, Current Net interest and dividend revenue Investment Income, Net Investments in trading securities Debt Securities, Trading Equity Securities Equity Securities [Member] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Equity funds Equity Funds [Member] Entity Filer Category Entity Filer Category Statement [Table] Statement [Table] Current Fiscal Year End Date Current Fiscal Year End Date Purchases of common stock with respect to awards granted Share Based Compensation Arrangement By Share Based Payment Award Available For Grant Share based awards available for future grants. Earnings Per Share, Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Stock Repurchased During Period, Shares Stock Repurchased During Period, Shares Salient MLP Total Return Fund, L.P. [Domain] Salient MLP Total Return Fund, L.P. [Domain] Salient MLP Total Return Fund, L.P. [Domain] Proceeds from Insurance Settlement, Investing Activities Proceeds from Insurance Settlement, Investing Activities Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Granted (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 U.S. Government and Government agency obligations US Treasury and Government [Member] Non-cash lease expense Non-cash lease expense Non-cash lease expense Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Zarvona Energy Fund GP , L.P . Zarvona Energy Fund GP , L.P . [Domain] Zarvona Energy Fund GP , L.P . Other Liabilities, Fair Value Disclosure Other Liabilities, Fair Value Disclosure Unrealized gains (losses) on private investments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Other Income Other Income Westwood Holdings Corporate, Non-Segment [Member] DESCRIPTION OF THE BUSINESS Nature of Operations [Text Block] Wealth Management Private Wealth [Member] Private wealth. Gross Unrealized Gains Debt Securities, Trading, Unrealized Gain Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Lease Contractual Term [Domain] Lease Contractual Term [Domain] Compensation and benefits payable Increase (Decrease) in Employee Related Liabilities Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Business Combination and Asset Acquisition [Abstract] Total Westwood Holdings Group, Inc. stockholders’ equity BALANCE BALANCE Equity, Attributable to Parent Consolidation Items [Axis] Consolidation Items [Axis] Business Acquisition, Pro Forma Revenue Business Acquisition, Pro Forma Revenue Goodwill, Impairment Loss Goodwill, Impairment Loss Westwood Funds® Westwood Funds [Member] Westwood funds. Restricted Stock Restricted Shares Subject Only to a Service Condition Restricted Stock [Member] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Treasury Stock [Text Block] Treasury Stock [Text Block] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Trust Trust [Member] Trust. Subsequent Events [Abstract] Subsequent Events [Abstract] Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest VARIABLE INTEREST ENTITIES Variable Interest Entity Disclosure [Text Block] Unobservable input - growth volatility - minimum Unobservable input - growth volatility - minimum Unobservable input - growth volatility - minimum Restricted Shares Subject to Service and Performance Conditions Restricted Shares Subject To Service And Performance Conditions [Member] Restricted shares subject to service and performance conditions. Payments to Acquire Intangible Assets Payments to Acquire Intangible Assets Mutual Fund [Member] Mutual Fund [Member] Geographic Distribution [Axis] Geographic Distribution [Axis] Computation of Basic and Diluted Shares Earnings Per Share Reconciliation [Abstract] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Asset Acquisition, Consideration Transferred, Contingent Consideration Asset Acquisition, Consideration Transferred, Contingent Consideration Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Level 2 Fair Value, Inputs, Level 2 [Member] CanadianEmployeeServiceAward [Member] CanadianEmployeeServiceAward [Member] CanadianEmployeeServiceAward [Member] Entity Emerging Growth Company Entity Emerging Growth Company Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Fund purchases of common stock Fund Purchases Of Common Stock Fund purchases of common stock. Trust Fees [Member] Trust Fee [Member] Trust Fee [Member] Purchase of treasury stock under employee stock plans (in shares) Treasury Stock, Shares, Acquired, Employee Stock Plan Treasury Stock, Shares, Acquired, Employee Stock Plan Variable Interest Entities [Abstract] Variable Interest Entities [Abstract] Variable interest entities. Unobservable input - revenue retention volatility - weighted average Unobservable input - revenue retention volatility - weighted average Unobservable input - revenue retention volatility - weighted average Document Fiscal Period Focus Document Fiscal Period Focus Discrete tax expense from stock-based compensation Discrete tax expense from stock-based compensation Discrete tax expense from stock-based compensation Antidilutive Securities Antidilutive Securities [Axis] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Common Stock [Member] Common Stock [Member] Fees unpaid from related party Accounts Receivable, Related Parties, Current (Deprecated 2023) Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code EARNINGS PER SHARE Earnings Per Share [Text Block] Product and Service [Axis] Product and Service [Axis] Income Statement Location Income Statement Location [Domain] Unobservable input - growth volatility - maximum Unobservable input - growth volatility - maximum Unobservable input - growth volatility - maximum Equity Method Investment, Ownership Percentage Equity Method Investment, Ownership Percentage Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax Document Fiscal Year Focus Document Fiscal Year Focus Geographical [Domain] Geographical [Domain] Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Equity, Including Portion Attributable to Noncontrolling Interest Accrued dividends DividendsAccrued DividendsAccrued Property and equipment, net of accumulated depreciation of $9,903 and $9,277 Property, Plant and Equipment, Net Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] ASSETS Assets [Abstract] Restricted Stock Subject To Service And Performance Conditions Policy [Text Block] Restricted Stock Subject To Service And Performance Conditions Policy [Text Block] Restricted stock subject to service and performance conditions. Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] DomesticServiceAndPerformanceAward [Member] DomesticServiceAndPerformanceAward [Member] DomesticServiceAndPerformanceAward [Member] Foreign Currency Transaction Gain (Loss), before Tax Gain (Loss), Foreign Currency Transaction, before Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax Restricted stock returned for payment of taxes Payment, Tax Withholding, Share-Based Payment Arrangement CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Other Current Assets Other Current Assets [Member] Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Cash paid during the period for income taxes Income Taxes Paid, Net Net Cash Provided by (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Deferred income taxes Deferred Income Tax Assets, Net Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Retained Earnings [Member] Retained Earnings [Member] Total Expense Recorded for Stock Based Compensation Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Property, Plant and Equipment Property, Plant and Equipment [Member] Total liabilities and stockholders' equity Liabilities and Equity Other long-term assets Other Assets, Noncurrent Basic (dollars per share) Earnings Per Share, Basic Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Accounting Policies [Abstract] Accounting Policies [Abstract] Gain (Loss) on Disposition of Assets Gain (Loss) on Disposition of Assets Restricted Stock Subject Only To A Service Condition Policy [Text Block] Restricted Stock Subject Only To A Service Condition Policy [Text Block] Restricted stock subject only to a service condition. Equity Interest Issued or Issuable, Type [Domain] Equity Interest Issued or Issuable, Type [Domain] Investment Income, Investment Expense Investment Income, Investment Expense Stockholders' Equity, Total Members' Equity Entity Address, City or Town Entity Address, City or Town Private investment fund Private Equity Funds [Member] Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Asset Acquisition, Consideration Transferred, Contingent Consideration Business Combination, Contingent Consideration, Liability, Fair Value by Fair Value Hierarchy Level [Extensible Enumeration] Westwood International Advisors Inc Westwood International Advisors Inc [Member] Westwood International Advisors Inc. Liabilities, Noncurrent Liabilities, Noncurrent CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Document Transition Report Document Transition Report Goodwill, Purchase Accounting Adjustments Goodwill, Purchase Accounting Adjustments Restricted Stock Subject Only to a Service Condition Restricted Stock Subject Only To Service Condition [Member] Restricted stock subject only to service condition. Unobservable input - revenue retention discount rate - maximum Unobservable input - revenue retention discount rate - maximum Unobservable input - revenue retention discount rate - maximum Unrealized Gain on Securities Unrealized Gain on Securities (Deprecated 2023) Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Net change in unrealized (appreciation) depreciation on investments Trading Securities, Change in Unrealized Holding Gain (Loss) (Deprecated 2023) Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Common stock, shares authorized Common Stock, Shares Authorized Common Trust Funds Common Trust Funds [Member] Common trust funds. Gross Unrealized Gains Equity Securities, FV-NI, Unrealized Gain 0 Accrued Purchases Of Treasury Stock Accrued Purchases Of Treasury Stock treasury stock, value, acquired Treasury Stock, Value, Acquired, Cost Method, Employee Stock Plan Treasury Stock, Value, Acquired, Cost Method, Employee Stock Plan Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Unobservable input - revenue retention discount rate - minimum Unobservable input - revenue retention discount rate - minimum Unobservable input - revenue retention discount rate - minimum Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Gain on sale of operations Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Costs Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Costs Zarvona Energy Fund II-A, L.P . Zarvona Energy Fund II-A, L.P . [Domain] Zarvona Energy Fund II-A, L.P . Gain (Loss) on Investments Gain (Loss) on Investments us-gaap_EquitySecuritiesMember [Member] us-gaap_EquitySecuritiesMember [Member] Exchange-traded bond funds Investment Performance [Member] Investment Performance [Member] Forfeited (dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Deferred income taxes Deferred Income Tax Expense (Benefit) Subsequent Event Type [Axis] Subsequent Event Type [Axis] Forfeited (shares) Forfeited (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Canadian Plan Canadian Plan [Member] Canadian Plan. Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] RouAssetsAndLeaseLiabilityRemeasurementAdjustment RouAssetsAndLeaseLiabilityRemeasurementAdjustment RouAssetsAndLeaseLiabilityRemeasurementAdjustment Westwood mutual funds Mutual Fund Administration And Distribution Expenses related to the administration, distribution and marketing of mutual funds. Share price Share Price Treasury stock, shares Treasury Stock, Shares (Deprecated 2023) Related Party Related Party, Type [Axis] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Total long-term assets Total long-term assets Total long-term assets Entity Registrant Name Entity Registrant Name Share repurchase - openb market Share repurchase - open market Share repurchase - open market Other, net Other revenue Other revenue Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Lease Contractual Term [Axis] Lease Contractual Term [Axis] Document Period End Date Document Period End Date Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Property and equipment, accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Dividends payable, date of record Dividends Payable, Date of Record Unobservable input - revenue retention volatility - minimum Unobservable input - revenue retention volatility - minimum Unobservable input - revenue retention volatility - minimum Entity Central Index Key Entity Central Index Key Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Dividends payable, date to be paid Dividends Payable, Date to be Paid Trust performance-based fees [Member] Trust performance-based fees [Member] Trust performance-based fees DomesticEmployeeServiceAward [Member] DomesticEmployeeServiceAward [Member] DomesticEmployeeServiceAward [Member] Expense related to mutual fund share incentive awards Share-based Payment Arrangement, Expense Share-Based Payment Arrangement, Expense Income tax provision Income Tax Expense (Benefit) Compensation and benefits payable Employee-related Liabilities, Current Vesting [Axis] Vesting [Axis] FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Restricted Stock Award, Forfeitures, Dividends Restricted Stock Award, Forfeitures, Dividends Accrued liability Mutual Fund Incentive Award Liability Mutual fund incentive award liability. Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Common Stock, Special Dividends, Per Share, Declared Common Stock, Special Dividends, Per Share, Declared Common Stock, Special Dividends, Per Share, Declared Accrued dividends Dividends Payable Non Current Dividends payable non current. Equity [Abstract] Equity [Abstract] Schedule Of Available For Sale Securities [Line Items] Debt Securities, Available-for-Sale [Line Items] Fiduciary and Trust [Member] Fiduciary and Trust [Member] Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax Entity Entity [Domain] Amendment Flag Amendment Flag Schedule Of Available For Sale Securities [Table] Schedule of Available-for-Sale Securities [Table] (Deprecated 2023) Business Combination, Acquisition of Less than 100 Percent of Broadmark, Noncontontrolling Interest Business Combination, Acquisition of Less than 100 Percent of Broadmark, Noncontontrolling Interest Business Combination, Acquisition of Less than 100 Percent of Broadmark, Noncontontrolling Interest Legal Entity Legal Entity [Axis] Money market funds Money Market Funds [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Private Wealth Advisory [Member] Private Wealth Advisory [Member] Private Wealth [Member] Advisory Advisory [Member] Advisory. Stock Repurchased and Retired During Period, Shares Stock Repurchased and Retired During Period, Shares Purchases of treasury stock, shares Purchases of treasury stock, shares Treasury Stock, Shares, Acquired Equity Interest Type [Axis] Equity Interest Type [Axis] Proceeds from Insurance Settlement, Operating Activities Proceeds from Insurance Settlement, Operating Activities Diluted (shares) Weighted average shares outstanding - diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Unobservable Measurement Input, Uncertainty, Description Unobservable Measurement Input, Uncertainty, Description Return of capital Return of capital Return of capital - Amount of distribution in excess of tax-basis earnings and profits. Gross Unrealized Gains Debt Securities, Trading, and Equity Securities, Unrealized Gain Debt Securities, Trading, and Equity Securities, Unrealized Gain Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer [Text Block] Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Additional paid-in capital Additional Paid in Capital, Common Stock Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Restricted stock returned for payment of taxes, shares Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Total assets Segment Assets Assets SUBSEQUENT EVENTS Subsequent Events [Text Block] APIC, Share-based Payment Arrangement, Increase for Cost Recognition APIC, Share-Based Payment Arrangement, Increase for Cost Recognition United States [Member] UNITED STATES Fair Value, Recurring Fair Value, Recurring [Member] Employee compensation and benefits Labor and Related Expense Unrealized Gains (Losses) on Private Investments Unrealized Gains (Losses) on Private Investments Unrealized Gains (Losses) on Private Investments Loss on Contract Termination Loss on Contract Termination Cash dividends paid Payments of Dividends Vested (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 Investments, at fair value Short-Term Investments LONG-TERM INCENTIVE COMPENSATION Compensation and Employee Benefit Plans [Text Block] Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Effect of currency rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents (Deprecated 2022) SEGMENT REPORTING Segment Reporting Disclosure [Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Revenue Disaggregation by Geographic Location [Table Text Block] Revenue Disaggregation by Geographic Location [Table Text Block] [Table Text Block] for Revenue Disaggregation by Geographic Location [Table] stock repurchase program stock repurchase program stock repurchase program - authorization increase subsequent to financial statement date NET CHANGE IN CASH AND CASH EQUIVALENTS Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Asset Management [Member] Asset Management [Member] Equity Component Equity Component [Domain] Cost Equity Securities, FV-NI, Cost Basic (shares) Weighted average shares outstanding - basic (shares) Weighted Average Number of Shares Outstanding, Basic Scenario [Axis] Scenario [Axis] Payment for Repurchases of Stock for Benefit Plan Payment for Repurchases of Stock for Benefit Plan Payment for Repurchases of Stock for Benefit Plan Entity Current Reporting Status Entity Current Reporting Status Noncontrolling Interest, Increase from Business Combination Noncontrolling Interest, Increase from Business Combination Operating Income (Loss) Operating Income (Loss) Realized Investment Gains (Losses) Realized Investment Gains (Losses) Investment Advisory Services [Member] Investment Advisory Services [Member] Investment Advisory Services [Member] REVENUES: Revenues [Abstract] Variable Interest Entity, Classification Consolidated Entities [Domain] Share repurchase - open market average price Share repurchase - open market average price Share repurchase - open market average price Assets Under Management Assets under Management, Carrying Amount Debt Securities, Trading, and Equity Securities, Unrealized Loss Debt Securities, Trading, and Equity Securities, Unrealized Loss Debt Securities, Trading, and Equity Securities, Unrealized Loss Segments [Axis] Segments [Axis] Unobservable input -book value multiple - maximum Unobservable input -book value multiple - maximum Unobservable input -book value multiple - maximum CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Statement [Line Items] Statement [Line Items] Cost Debt Securities, Trading, and Equity Securities, FV-NI, Cost Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Treasury Stock [Member] Treasury Stock [Member] (Deprecated 2023) Scenario [Domain] Scenario [Domain] Payments to acquire Broadmark, gross Payments to acquire Broadmark, gross Payments to acquire Broadmark, gross Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Noncontrolling Interest Noncontrolling Interest [Member] Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]