Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Unobservable input - revenue retention volatility - maximum Unobservable input - revenue retention volatility - maximum Unobservable input - revenue retention volatility - maximum Earnings Per Share, Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Asset Management [Member] Asset Management [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net income Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Parent Variable Interest Entities Consolidated Entities [Axis] Entity Emerging Growth Company Entity Emerging Growth Company Operating lease right-of-use assets Operating Lease, Right-of-Use Asset 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. Compensation and benefits payable Employee-related Liabilities, Current Income Statement Location Income Statement Location [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Entity Address, Address Line One Entity Address, Address Line One Estimated Fair Value Private Equity Securities, FV-NI, Current Cost Debt Securities, Trading, Amortized Cost 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 Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Additional paid-in capital Additional Paid in Capital, Common Stock Entity Filer Category Entity Filer Category Impairment of Intangible Assets (Excluding Goodwill) Impairment of Intangible Assets (Excluding Goodwill) Computation of Basic and Diluted Shares Earnings Per Share Reconciliation [Abstract] Employee Benefit and Share-based Payment Arrangement, Noncash Expense [Abstract] Employee Benefit and Share-based Payment Arrangement, Noncash Expense [Abstract] Other long-term assets Other Assets, Noncurrent 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 Target [Domain] Target [Domain] [Domain] for Target [Axis] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Segments [Axis] Segments [Axis] Accrued stock repurchases Accrued Stock Repurchases Accrued Stock Repurchases Shares remain available for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant NET CHANGE IN CASH AND CASH EQUIVALENTS Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Unobservable Measurement Input, Uncertainty, Description Unobservable Measurement Input, Uncertainty, Description APIC, Share-based Payment Arrangement, Increase for Cost Recognition APIC, Share-based Payment Arrangement, Increase for Cost Recognition Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document and entity information. Related Party Transaction, Expenses from Transactions with Related Party Related Party Transaction, Expenses from Transactions with Related Party 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 Gain (Loss) on Disposition of Assets Gain (Loss) on Disposition of Assets Document Fiscal Year Focus Document Fiscal Year Focus Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Amortization of intangible assets Amortization of Intangible Assets Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Other Current Assets Other Current Assets [Member] Anti-dilutive restricted shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Unobservable input - growth volatility - weighted average Unobservable input - growth volatility - weighted average Unobservable input - growth volatility - weighted average Subsequent Events [Abstract] Subsequent Events [Abstract] Dividends payable Dividends Payable, Current 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 Business Combination and Asset Acquisition [Abstract] 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 Business combination, consideration transferred for Broadmark Business combination, consideration transferred for Broadmark Business combination, consideration transferred for Broadmark stock repurchase authorization - subsequent event stock repurchase authorization - subsequent event stock repurchase authorization - authorization subsequent to financial statement date Equity Award Award Type [Domain] ASSETS Assets [Abstract] Total Total [Member] Total Related Party Transactions [Abstract] Related Party Transactions [Abstract] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Net intersegment revenues Net Intersegment Revenues Net intersegment revenues. Granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Entity Address, City or Town Entity Address, City or Town Retained Earnings [Member] Retained Earnings [Member] Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized Noncontrolling Interest, Ownership Percentage by Parent Noncontrolling Interest, Ownership Percentage by Parent Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Related Party Related Party [Axis] Unobservable input -book value multiple - weighted average Unobservable input -book value multiple - weighted average Unobservable input -book value multiple - weighted average Amount at Risk Risk Of Loss The risk of loss on Investment in VIE. Accounts receivable Increase (Decrease) in Accounts Receivable Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Accrued purchase of property and equipment Capital Expenditures Incurred but Not yet Paid Dividends payable, date of record Dividends Payable, Date of Record Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Investments carried at fair value, unrealized loss Investments carried at fair value, unrealized loss Investments carried at fair value, unrealized loss Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Other current assets Increase (Decrease) in Other Current Assets Entity Interactive Data Current Entity Interactive Data Current Private equity Private Equity Investments [Member] Private Equity Investments [Member] Basic (dollars per share) Earnings Per Share, Basic U.S. Government and Government agency obligations US Treasury and Government [Member] Westwood Hospitality Fund I LLC [Member] Westwood Hospitality Fund I LLC [Member] Westwood Hospitality Fund I LLC [Member] Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer [Text Block] Sublease Income Sublease Income 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 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Document Type Document Type Canada CANADA Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Due from related party Due from Related Parties 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] Entity Current Reporting Status Entity Current Reporting Status Schedule of Investments [Table] Schedule of Investments [Table] 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 Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage Unobservable input - growth discount rate - minimum Unobservable input - growth discount rate - minimum Unobservable input - growth discount rate - minimum Business Combination, Consideration Transferred Business Combination, Consideration Transferred Estimated Fair Value Total assets measured at fair value Debt Securities, Trading, and Equity Securities, FV-NI Mutual Fund Advisory [Member] Mutual Fund Advisory [Member] [Member] Mutual Fund Advisory [Member] [Member] Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Plan Name [Axis] Plan Name [Axis] Level 1 Fair Value, Inputs, Level 1 [Member] Goodwill, Impairment Loss Goodwill, Impairment Loss Document Transition Report Document Transition Report Treasury Stock [Text Block] Treasury Stock [Text Block] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Total liabilities and stockholders' equity Liabilities and Equity Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Goodwill, Period Increase (Decrease) Goodwill, Period Increase (Decrease) Scenario [Axis] Scenario [Axis] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] SUPPLEMENTAL CASH FLOW INFORMATION: Supplemental Cash Flow Elements [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Long-term Investments Carried at Fair Value Long-term Investments Carried at Fair Value Long-term Investments Carried at Fair Value 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) CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Operating Lease, Impairment Loss Operating Lease, Impairment Loss EARNINGS PER SHARE Earnings Per Share [Text Block] Treasury Stock, Value, Acquired, Cost Method Treasury Stock, Value, Acquired, Cost Method Treasury Stock Acquired, Average Cost Per Share Treasury Stock Acquired, Average Cost Per Share Equity Method Investment, Ownership Percentage Equity Method Investment, Ownership Percentage Income Taxes Receivable, Current Income Taxes Receivable, Current Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Institutional Institutional [Member] Institutional. Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Proceeds from Sale of Productive Assets Proceeds from Sale of Productive Assets 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 Equity Securities, FV-NI, Gain (Loss) [Abstract] Equity Securities, FV-NI, Gain (Loss) [Abstract] Trading Symbol Trading Symbol Deferred income taxes Deferred Income Tax Assets, Net Current liabilities: Liabilities, Current [Abstract] UCITS Fund Undertaking For Collective Investment In Transferable Securities [Member] Undertaking for collective investment in transferable securities. Revenue [Policy Text Block] Revenue [Policy Text Block] General and administrative General and Administrative Expense Cost Debt Securities, Trading, and Equity Securities, FV-NI, Cost Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Level 3 Fair Value, Inputs, Level 3 [Member] 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 Trust Trust for Benefit of Employees [Member] Equity Securities Equity Securities [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Number of operating segments Number of Reportable Segments Tax Adjustments, Settlements, and Unusual Provisions Tax Adjustments, Settlements, and Unusual Provisions Foreign Currency Transaction Gain (Loss), before Tax Foreign Currency Transaction Gain (Loss), before Tax Common stock, $0.01 par value, authorized 25,000,000 shares, issued 11,925,846 and outstanding 9,212,390 shares at March 31, 2023; issued 11,527,544 and outstanding 8,881,811 shares at December 31, 2022 Common Stock, Value, Issued Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Equity Interest Issued or Issuable, Type [Domain] Equity Interest Issued or Issuable, Type [Domain] Remaining unrecognized compensation cost recognized over a remaining weighted average period Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 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 Goodwill, Acquired During Period Goodwill, Acquired During Period Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Performance Shares [Member] Performance Shares [Member] Equity funds Equity Funds [Member] Loss on Contract Termination Loss on Contract Termination Commitments and contingencies Commitments and Contingencies Treasury Stock, Value, Acquired, Par Value Method Treasury Stock, Value, Acquired, Par Value Method Broadmark Asset Management LLC Broadmark Asset Management LLC [Domain] Broadmark Asset Management LLC Subsequent Event [Table] Subsequent Event [Table] LEASES Lessee, Operating Leases [Text Block] Investment Owned, at Fair Value Investment Owned, at Fair Value Restricted Stock Restricted Shares Subject Only to a Service Condition Restricted Stock [Member] LONG-TERM INCENTIVE COMPENSATION Compensation and Employee Benefit Plans [Text Block] Unrealized Gain on Securities Unrealized Gain on Securities Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Document Period End Date Document Period End Date INVESTMENTS Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Gross Unrealized Gains Equity Securities, FV-NI, Unrealized Gain Investments carried at fair value, unrealized gain Investments carried at fair value, unrealized gain Investments carried at fair value, unrealized gain Total expenses Costs and Expenses VIE Variable Interest Entity [Member] Variable interest entity. Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition, Pro Forma Net Income (Loss) Entity Registrant Name Entity Registrant Name Treasury stock, shares Treasury Stock, Shares Trust performance-based Trust performance-based [Member] Trust performance-based Fees unpaid from related party Accounts Receivable, Related Parties, Current 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] Fees earned from related party Revenue from Related Parties Dividends declared per share (dollars per share) Common Stock, Dividends, Per Share, Declared Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax Fair Value Inputs [Abstract] (Deprecated 2018-01-31) Fair Value Inputs [Abstract] (Deprecated 2018-01-31) Schedule Of Available For Sale Securities [Table] Schedule of Available-for-sale Securities [Table] Cash dividends paid Payments of Dividends Consolidation Items [Domain] Consolidation Items [Domain] Equity [Abstract] Equity [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Effect of currency rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents Performance-based fees [Member] performance fee [Member] performance fee [Member] Common Stock [Member] Common Stock [Member] SEGMENT REPORTING Segment Reporting Disclosure [Text Block] Operating Income (Loss) Operating Income (Loss) Professional services Professional Fees Schedule Of Available For Sale Securities [Line Items] Debt Securities, Available-for-sale [Line Items] Operating Lease, Liability, Current Operating Lease, Liability, Current Net fee revenues from external sources Revenue From External Sources Revenue From External Sources Shares Issued, Shares, Share-based Payment Arrangement, Forfeited Shares Issued, Shares, Share-based Payment Arrangement, Forfeited Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Depreciation Depreciation Mutual Fund Share Incentive Awards Mutual Fund Share Incentive Awards [Member] Mutual Fund Share Incentive Awards Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Treasury Stock [Member] Treasury Stock [Member] Unobservable input - revenue retention discount rate - weighted average Unobservable input - revenue retention discount rate - weighted average Unobservable input - revenue retention discount rate - weighted average Business Combination, Step Acquisition, Equity Interest in Acquiree, Description Business Combination, Step Acquisition, Equity Interest in Acquiree, Description Other Assets Other Assets [Member] Scenario [Axis] Target [Axis] Target [Axis] Other liabilities Increase (Decrease) in Other Operating Liabilities Stock Repurchased and Retired During Period, Shares Stock Repurchased and Retired During Period, Shares Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Property, Plant and Equipment Property, Plant and Equipment [Member] Dilutive potential shares from unvested restricted shares (shares) Incremental Common Shares Attributable To Nonvested Restricted Shares Incremental common shares attributable to nonvested restricted shares. Equity Securities, FV-NI, Unrealized Loss Equity Securities, FV-NI, Unrealized Loss Total liabilities Liabilities Legal Entity Legal Entity [Axis] Investments in securities: Investments, Fair Value Disclosure [Abstract] Award Type Award Type [Axis] Variable Interest Entities Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] (Deprecated 2020-01-31) Consolidation Items [Axis] Consolidation Items [Axis] Total Westwood Holdings Group, Inc. stockholders’ equity BALANCE BALANCE Stockholders' Equity Attributable to Parent Common stock, shares issued Common Stock, Shares, Issued Investment Balances Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Unobservable input - growth discount rate - weighted average Unobservable input - growth discount rate - weighted average Unobservable input - growth discount rate - weighted average Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Other Revenue Misc Services [Member] Other Revenue Misc Services [Member] Other Revenue Misc Services [Member] Consolidation, Variable Interest Entity, Policy [Policy Text Block] Consolidation, Variable Interest Entity, Policy [Policy Text Block] Purchases of treasury stock Amount of shares purchased in the open market Payments for Repurchase of Common Stock Stockholders' Equity: Stockholders' Equity Attributable to Parent [Abstract] Gain on sale of operations Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Net interest and dividend revenue Investment Income, Net Operating Lease, Liability, Noncurrent Operating Lease, Liability, Noncurrent Assets Under Management Assets under Management, Carrying Amount Unobservable input -book value multiple - minimum Unobservable input -book value multiple - minimum Unobservable input -book value multiple - minimum Compensation and benefits payable Increase (Decrease) in Employee Related Liabilities City Area Code City Area Code Share price Share Price Retained earnings (accumulated deficit) Retained Earnings (Accumulated Deficit) Operating Segments Operating Segments [Member] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] 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. Gain (Loss) on Investments Gain (Loss) on Investments Income Statement [Abstract] Income Statement [Abstract] Equity Method Investments Equity Method Investments Amendment Flag Amendment Flag Salient MLP Total Return Fund, L.P. [Domain] Salient MLP Total Return Fund, L.P. [Domain] Salient MLP Total Return Fund, L.P. [Domain] Asset Class [Domain] Asset Class [Domain] Investments, at fair value Short-term Investments Fiduciary and Trust [Member] Fiduciary and Trust [Member] Cash Acquired in Excess of Payments to Acquire Business Cash Acquired in Excess of Payments to Acquire Business Non-cash lease expense Non-cash lease expense Non-cash lease expense Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Income tax provision Income Tax Expense (Benefit) Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Zarvona Energy Fund GP , L.P . Zarvona Energy Fund GP , L.P . [Domain] Zarvona Energy Fund GP , L.P . Equity Components Equity Components [Axis] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Investment Type [Axis] Investment Type [Axis] Antidilutive Securities Antidilutive Securities [Axis] Total current assets Assets, Current Accounts Receivable Accounts Receivable [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Forfeited (shares) Forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Net change in unrealized (appreciation) depreciation on investments Trading Securities, Change in Unrealized Holding Gain (Loss) Weighted average shares outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Asset Acquisition [Table] Asset Acquisition [Table] Wealth Management Private Wealth [Member] Private wealth. Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Information technology Communications and Information Technology Entity File Number Entity File Number Stock Repurchased During Period, Value Stock Repurchased During Period, Value Schedule Of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] 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] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Noncontrolling Interest, Increase from Business Combination Noncontrolling Interest, Increase from Business Combination Product and Service [Axis] Product and Service [Axis] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Westwood Funds® Westwood Funds [Member] Westwood funds. Entity Small Business Entity Small Business Asset Acquisition, Consideration Transferred, Contingent Consideration Business Combination, Contingent Consideration, Liability, Fair Value by Fair Value Hierarchy Level [Extensible Enumeration] Remaining unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Trust Trust [Member] Trust. Equity Component Equity Component [Domain] 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. Sales and marketing Selling and Marketing Expense Stock Repurchased During Period, Shares Stock Repurchased During Period, Shares Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 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 Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Income taxes payable Increase (Decrease) in Accrued Taxes Payable Statement [Line Items] Statement [Line Items] CanadianEmployeeServiceAward [Member] CanadianEmployeeServiceAward [Member] CanadianEmployeeServiceAward [Member] Other Income Other Income Payments to Acquire Investments Payments to Acquire Investments Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures 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 Counterparty Name [Domain] Counterparty Name [Domain] 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 Discrete tax expense from stock-based compensation Discrete tax expense from stock-based compensation Discrete tax expense from stock-based compensation Entity Address, State or Province Entity Address, State or Province Variable Interest Entity, Consolidated, Assets, Noncurrent Variable Interest Entity, Consolidated, Assets, Noncurrent (Deprecated 2020-01-31) Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Level 2 Fair Value, Inputs, Level 2 [Member] Geographic Distribution [Domain] Geographic Distribution [Domain] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Net sales of trading securities Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI Westwood Holdings Corporate, Non-Segment [Member] Entity Entity [Domain] Segment Reporting [Abstract] Segment Reporting [Abstract] Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Entity Shell Company Entity Shell Company Unobservable input - growth volatility - maximum Unobservable input - growth volatility - maximum Unobservable input - growth volatility - maximum Asset Class [Axis] Asset Class [Axis] Local Phone Number Local Phone Number Total Expense Recorded for Stock Based Compensation Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Vesting [Axis] Vesting [Axis] Accrued dividends DividendsAccrued DividendsAccrued Total assets Segment Assets Assets Realized Investment Gains (Losses) Realized Investment Gains (Losses) Plan Name [Domain] Plan Name [Domain] Common stock, shares authorized Common Stock, Shares Authorized Dividends payable, date to be paid Dividends Payable, Date to be Paid Geographical [Domain] Geographical [Domain] Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable Members' Equity Attributable to Noncontrolling Interest Members' Equity Attributable to Noncontrolling Interest Product and Service [Domain] Product and Service [Domain] 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. DomesticServiceAndPerformanceAward [Member] DomesticServiceAndPerformanceAward [Member] DomesticServiceAndPerformanceAward [Member] Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest Liabilities, Noncurrent Liabilities, Noncurrent Cost Equity Securities, FV-NI, Cost Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Significant Accounting Policies Significant Accounting Policies [Text Block] Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Entity Tax Identification Number Entity Tax Identification Number Subsequent Event [Line Items] Subsequent Event [Line Items] Lease Contractual Term [Domain] Lease Contractual Term [Domain] Geographical [Axis] Geographical [Axis] Basic (shares) Weighted average shares outstanding - basic (shares) Weighted Average Number of Shares Outstanding, Basic Diluted (dollars per share) Earnings Per Share, Diluted Segment [Domain] Segments [Domain] Vesting [Domain] Vesting [Domain] 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. Cash paid during the period for income taxes Income Taxes Paid, Net SUBSEQUENT EVENTS Subsequent Events [Text Block] Restricted Stock Award, Forfeitures Restricted Stock Award, Forfeitures Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Net change in unrealized appreciation (depreciation) on private investments Unrealized Gain (Loss) on Investments Net Cash Provided by (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Treasury stock, at cost - 2,713,456 shares at March 31, 2023; 2,645,713 shares at December 31, 2022 Treasury Stock, Value Treasury Stock, Value Westwood International Advisors Inc Westwood International Advisors Inc [Member] Westwood International Advisors Inc. Related Party Transaction [Line Items] Related Party Transaction [Line Items] Restricted Stock Award, Forfeitures, Dividends Restricted Stock Award, Forfeitures, Dividends 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 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] Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Stock Issued During Period, Value, Restricted Stock Award, Forfeitures FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Common Trust Funds Common Trust Funds [Member] Common trust funds. 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 Dividends declared Dividends, Common Stock Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Unobservable input - revenue retention discount rate - minimum Unobservable input - revenue retention discount rate - minimum Unobservable input - revenue retention discount rate - minimum AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] Common stock, shares outstanding BALANCE, shares BALANCE, shares Common Stock, Shares, Outstanding Long-term Investments Long-term Investments Stockholders' Equity, Total Members' Equity REVENUES: Revenues [Abstract] Issuance of restricted stock, net of forfeitures, shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Zarvona Energy Fund II-A, L.P . Zarvona Energy Fund II-A, L.P . [Domain] Zarvona Energy Fund II-A, L.P . Payments to Acquire Intangible Assets Payments to Acquire Intangible Assets Lease Contractual Term [Axis] Lease Contractual Term [Axis] 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 Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Variable Interest Entity, Classification Consolidated Entities [Domain] Gross Unrealized Gains Debt Securities, Trading, Unrealized Gain Proceeds from Sale of Debt and Equity Securities, FV-NI, Held-for-investment Proceeds from Sale of Debt and Equity Securities, FV-NI, Held-for-investment us-gaap_EquitySecuritiesMember [Member] us-gaap_EquitySecuritiesMember [Member] Exchange-traded bond funds CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Income Statement Location Income Statement Location [Domain] Investments in trading securities Debt Securities, Trading Property and equipment, net of accumulated depreciation of $9,578 and $9,277 Property, Plant and Equipment, Net Canadian Plan Canadian Plan [Member] Canadian Plan. Westwood mutual funds Mutual Fund Administration And Distribution Expenses related to the administration, distribution and marketing of mutual funds. Purchases of treasury stock, shares Purchases of treasury stock, shares Treasury Stock, Shares, Acquired Unrealized gains (losses) on private investments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Earnings per share: Earnings Per Share [Abstract] Business Acquisition, Pro Forma Revenue Business Acquisition, Pro Forma Revenue Total long-term assets Total long-term assets Total long-term assets Share repurchase - openb market Share repurchase - open market Share repurchase - open market Document Quarterly Report Document Quarterly Report Other, net Other revenue Other revenue Total revenues Revenues Cost Method Investments Cost Method Investments Severance Costs Severance Costs Restricted Stock, Value, Shares Issued Net of Tax Withholdings Restricted Stock, Value, Shares Issued Net of Tax Withholdings Other Liabilities, Fair Value Disclosure Other Liabilities, Fair Value Disclosure Treasury Stock, Common, Value Treasury Stock, Common, Value Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding EXPENSES: Costs and Expenses [Abstract] Unobservable input - revenue retention volatility - minimum Unobservable input - revenue retention volatility - minimum Unobservable input - revenue retention volatility - minimum Asset Acquisition, Contingent Consideration, Liability Asset Acquisition, Contingent Consideration, Liability Trust performance-based fees [Member] Trust performance-based fees [Member] Trust performance-based fees Schedule Of Related Party Transactions By Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Foreign Currency Translation Adjustment, Description Foreign Currency Translation Adjustment, Description DomesticEmployeeServiceAward [Member] DomesticEmployeeServiceAward [Member] DomesticEmployeeServiceAward [Member] Expense related to mutual fund share incentive awards Share-based Payment Arrangement, Expense Share-based Payment Arrangement, Expense Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Costs Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Costs Europe [Member] Europe [Member] Earnings per share: Earnings Per Share, Basic and Diluted [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Asset Acquisition [Line Items] Asset Acquisition [Line Items] Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Employee compensation and benefits Labor and Related Expense Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Investments [Domain] Investments [Domain] Accrued liability Mutual Fund Incentive Award Liability Mutual fund incentive award liability. Common Stock, Special Dividends, Per Share, Declared Common Stock, Special Dividends, Per Share, Declared Common Stock, Special Dividends, Per Share, Declared Counterparty Name [Axis] Counterparty Name [Axis] Accrued dividends Dividends Payable Non Current Dividends payable non current. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents United States [Member] UNITED STATES Common stock, par value (dollars per share) Common Stock, Par or Stated Value Per Share VARIABLE INTEREST ENTITIES Variable Interest Entity Disclosure [Text Block] 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 Current Assets: Assets, Current [Abstract] Debt Securities, Trading, Unrealized Loss Debt Securities, Trading, Unrealized Loss Leases [Abstract] Leases [Abstract] Entity Central Index Key Entity Central Index Key Security Exchange Name Security Exchange Name Private Wealth Advisory [Member] Private Wealth Advisory [Member] Private Wealth [Member] Restricted stock returned for payment of taxes, shares Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Equity Interest Type [Axis] Equity Interest Type [Axis] Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Advisory Advisory [Member] Advisory. Diluted (shares) Weighted average shares outstanding - diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax Fair Value, Recurring Fair Value, Recurring [Member] Service period of mutual fund share incentive award Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Related Party Related Party [Domain] Debt Securities, Trading, Gain (Loss) [Abstract] Debt Securities, Trading, Gain (Loss) [Abstract] Current Fiscal Year End Date Current Fiscal Year End Date STOCKHOLDERS' EQUITY Stockholders' Equity Note Disclosure [Text Block] Private investment fund Private Equity Funds [Member] 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 Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Investment Income, Investment Expense Investment Income, Investment Expense Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Investing Activities Disaggregation of Revenue [Abstract] Disaggregation of Revenue [Abstract] Change in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Property and equipment, accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 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 Total current liabilities Liabilities, Current Restricted stock returned for payment of taxes Payment, Tax Withholding, Share-based Payment Arrangement Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Eliminations Intersegment Eliminations [Member] 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 Unrealized Gains (Losses) on Private Investments Unrealized Gains (Losses) on Private Investments Unrealized Gains (Losses) on Private Investments Money market funds Money Market Funds [Member] Revenue from Contract with Customer, Including Assessed Tax Revenue from Contract with Customer, Including Assessed Tax Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Investment Performance [Member] Investment Performance [Member] 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 Fee revenues from Westwood VIEs Variable Interest Entity, Measure of Activity, Revenues Title of 12(b) Security Title of 12(b) Security Mutual Fund [Member] Mutual Fund [Member] Statement [Table] Statement [Table] Other current assets Other Assets, Current Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Statistical Measurement [Axis] Statistical Measurement [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 Adjustments to Additional Paid in Capital, Other Adjustments to Additional Paid in Capital, Other Subsequent Event [Member] Subsequent Event [Member] Investment Advisory Services [Member] Investment Advisory Services [Member] Investment Advisory Services [Member] Intangible assets, net Finite-Lived Intangible Assets, Net Goodwill Goodwill 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] Subsequent Event, Description Subsequent Event, Description Share repurchase - open market average price Share repurchase - open market average price Share repurchase - open market average price Debt Securities, Trading, and Equity Securities, Unrealized Loss Debt Securities, Trading, and Equity Securities, Unrealized Loss Debt Securities, Trading, and Equity Securities, Unrealized Loss Income taxes payable Accrued Income Taxes, Current Investments Measured at NAV Fair Value Measured at Net Asset Value Per Share [Member] DESCRIPTION OF THE BUSINESS Nature of Operations [Text Block] Adjustments to reconcile net income to net cash (used in) provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Scenario [Domain] Scenario [Domain] Unobservable input -book value multiple - maximum Unobservable input -book value multiple - maximum Unobservable input -book value multiple - maximum Subsequent Event Type [Axis] Subsequent Event Type [Axis] Geographic Distribution [Axis] Geographic Distribution [Axis] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Payments to acquire Broadmark, gross Payments to acquire Broadmark, gross Payments to acquire Broadmark, gross Deferred income taxes Deferred Income Tax Expense (Benefit) Fair Value, Inputs, Level 1, 2 and 3 [Member]