Variable Interest Entities [Abstract] Variable interest entities. VARIABLE INTEREST ENTITIES Variable Interest Entity Disclosure [Text Block] Employee Benefits and Share-based Compensation, Noncash [Abstract] LONG-TERM INCENTIVE COMPENSATION Compensation and Employee Benefit Plans [Text Block] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type Award Type [Axis] Equity Award Equity Award [Domain] Restricted Shares Subject Only to a Service Condition Restricted Stock [Member] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 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] Non-vested, beginning balance, shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Non-vested, ending balance, shares Non-vested, beginning 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 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 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 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 Non-vested, ending balance, (dollars per share) Earnings Per Share [Abstract] Computation of Basic and Diluted Shares Earnings Per Share Reconciliation [Abstract] Net income Net Income (Loss) Attributable to Parent Weighted average shares outstanding - basic (shares) Weighted Average Number of Shares Outstanding, Basic Dilutive potential shares from unvested restricted shares (shares) Incremental Common Shares Attributable To Nonvested Restricted Shares Incremental common shares attributable to nonvested restricted shares. Weighted average shares outstanding - diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Earnings per share: Earnings Per Share, Basic and Diluted [Abstract] Basic (dollars per share) Earnings Per Share, Basic Diluted (dollars per share) Earnings Per Share, Diluted Accounting Changes and Error Corrections [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Domain] Adjustments for Change in Accounting Principle [Domain] Restatement [Axis] Restatement [Axis] Restatement [Domain] Restatement [Domain] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Disposal Groups, Including Discontinued Operations [Table Text Block] Disposal Groups, Including Discontinued Operations [Table Text Block] Leases [Abstract] Statement [Table] Statement [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Statement [Line Items] Statement [Line Items] Corporate offices remaining lease terms Corporate offices remaining lease terms Corporate offices remaining lease terms Sublease Term Sublease Term Sublease Term Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, Payments, Due Year Five Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Operating Lease, Expense Operating Lease, Expense Sublease Income Sublease Income Operating Lease, Payments Operating Lease, Payments Operating Lease, Liability, Current Operating Lease, Liability, Current Operating Lease, Liability, Noncurrent Operating Lease, Liability, Noncurrent Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Lessee, Operating Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, Payments, Due after Year Five Total Lease Payment Total Lease Payment Total Lease Payment Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Operating Lease, Liability Operating Lease, Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Office equipment lease term Office equipment lease term Office equipment lease term Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Significant Accounting Policies [Text Block] Lessee, Operating Leases [Text Block] Lessee, Operating Leases [Text Block] Related Party Transactions [Abstract] Schedule Of Related Party Transactions By Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party Related Party [Axis] Related Party Related Party [Domain] Trust Trust for Benefit of Employees [Member] Variable Interest Entities Variable Interest Entities [Axis] Variable Interest Entity, Classification Variable Interest Entity, Classification [Domain] UCITS Fund Undertaking For Collective Investment In Transferable Securities [Member] Undertaking for collective investment in transferable securities. Private Equity Investments [Member] Private Equity Investments [Member] Private Equity Investments [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Due from related party Due from Related Parties Fees earned from related party Revenue from Related Parties Fees unpaid from related party Accounts Receivable, Related Parties, Current Related Party Transaction, Purchases from Related Party Related Party Transaction, Purchases from Related Party Investments, Debt and Equity Securities [Abstract] Schedule of Investments [Table] Schedule of Investments [Table] Investment Type [Axis] Investment Type [Axis] Investments Investments [Domain] Equity funds Equity Funds [Member] Money market funds Money Market Funds [Member] Private Equity Funds [Member] Private Equity Funds [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] U.S. Government and Government agency obligations US Treasury and Government [Member] VIE Variable Interest Entity [Member] Variable interest entity. Schedule of Investments [Line Items] Schedule of Investments [Line Items] Long-term Investments Long-term Investments Cost Trading Securities, Cost Trading Securities, Unrealized Holding Gain Trading Securities, Unrealized Holding Gain Trading Securities, Unrealized Holding Loss Trading Securities, Unrealized Holding Loss Investments, at fair value Short-term Investments Estimated Market Value Debt Securities, Trading, and Equity Securities, FV-NI Debt Securities, Trading, and Equity Securities, FV-NI, Cost Investments carried at fair value, cost Investments carried at fair value, cost Investments carried at fair value, unrealized gain Investments carried at fair value, unrealized gain Investments carried at fair value, unrealized gain Investments carried at fair value, unrealized loss Investments carried at fair value, unrealized loss Investments carried at fair value, unrealized loss Equity Securities, FV-NI, Cost Equity Securities, FV-NI, Cost Unrealized Gain on Securities Equity Securities, FV-NI, Unrealized Gain Equity Securities, FV-NI, Unrealized Loss Equity Securities, FV-NI, Unrealized Loss Investment in private fund Investment in private fund Investment in private fund Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation Depreciation Amortization of intangible assets Amortization of Intangible Assets Unrealized (gains) losses on trading investments Trading Securities, Change in Unrealized Holding Gain (Loss) Stock based compensation expense Share-based Compensation Deferred income taxes Deferred Income Tax Expense (Benefit) Non-cash lease expense Non-cash lease expense Non-cash lease expense Gain on sale of operations Gain on sale of operations Gain on sale of operations Change in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Net sales (purchases) of investments - trading securities Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI Accounts receivable Increase (Decrease) in Accounts Receivable Other current assets Increase (Decrease) in Other Current Assets Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Compensation and benefits payable Increase (Decrease) in Employee Related Liabilities Income taxes payable Increase (Decrease) in Accrued Taxes Payable Other liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from sale of operations Proceeds from Divestiture of Businesses Payments to Acquire Investments Payments to Acquire Investments Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Purchases of treasury stock Payments for Repurchase of Common Stock Payment for Repurchases of Stock for Benefit Plan Payment for Repurchases of Stock for Benefit Plan Payment for Repurchases of Stock for Benefit Plan Restricted stock returned for payment of taxes Payments Related to Tax Withholding for Share-based Compensation Cash dividends paid Payments of Dividends Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Effect of currency rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents Net Change in Cash and Cash Equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period Supplemental cash flow information: Supplemental Cash Flow Elements [Abstract] Cash paid during the period for income taxes Income Taxes Paid, Net DividendsAccrued DividendsAccrued DividendsAccrued Capital Expenditures Incurred but Not yet Paid Capital Expenditures Incurred but Not yet Paid Goodwill and Intangible Assets Disclosure [Abstract] Goodwill, Impairment Loss Goodwill, Impairment Loss Impairment of Intangible Assets (Excluding Goodwill) Impairment of Intangible Assets (Excluding Goodwill) Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities Antidilutive Securities [Axis] Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Restricted Stock Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Anti-dilutive restricted shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount INVESTMENTS Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Statement of Financial Position [Abstract] Property and equipment, accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Common stock, par value (dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Treasury stock, shares Treasury Stock, Shares Long-term Investments Carried at Fair Value Long-term Investments Carried at Fair Value Long-term Investments Carried at Fair Value Earnings Per Share, Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Lease Maturity Analysis [Table Text Block] Lease Maturity Analysis [Table Text Block] [Table Text Block] for Lease Maturity Analysis [Table] Lease, Cost [Table Text Block] Lease, Cost [Table Text Block] Lessee, Operating Lease, Disclosure [Table Text Block] Lessee, Operating Lease, Disclosure [Table Text Block] Schedule Of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Westwood Funds® Westwood Funds [Member] Westwood funds. Common Trust Funds Common Trust Funds [Member] Common trust funds. Westwood Hospitality Fund I LLC [Member] Westwood Hospitality Fund I LLC [Member] Westwood Hospitality Fund I LLC [Member] Wealth Management Private Wealth [Member] Private wealth. Institutional Institutional [Member] Institutional. Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Variable Interest Entities Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] Assets Under Management Assets under Management, Carrying Amount Amount at Risk Risk Of Loss The risk of loss on Investment in VIE. Income Statement [Abstract] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Asset Management [Member] Asset Management [Member] Investment Performance [Member] Investment Performance [Member] Fiduciary and Trust [Member] Fiduciary and Trust [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Revenue from Contract with Customer, Including Assessed Tax Revenue from Contract with Customer, Including Assessed Tax REVENUES: Revenues [Abstract] Other Revenue, Net Other Revenue, Net Other Revenue, Net Total revenues Revenues EXPENSES: Costs and Expenses [Abstract] Employee compensation and benefits Labor and Related Expense Sales and marketing Selling and Marketing Expense Westwood mutual funds Mutual Fund Administration And Distribution Expenses related to the administration, distribution and marketing of mutual funds. Information technology Communications and Information Technology Professional services Professional Fees General and administrative General and Administrative Expense Foreign Currency Transaction Gain (Loss), before Tax Foreign Currency Transaction Gain (Loss), before Tax Total expenses Costs and Expenses Operating Income (Loss) Operating Income (Loss) Gain on sale of operations Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Other Income Other Income Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) Net income Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Earnings per share: Weighted average shares outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Basic (shares) Diluted (shares) Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Statement of Stockholders' Equity [Abstract] Equity Components Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock, Par Common Stock [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Treasury Stock Treasury Stock [Member] Accumulated Other Comprehensive Gain (Loss) AOCI Attributable to Parent [Member] Retained Earnings Retained Earnings [Member] Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared BALANCE Stockholders' Equity Attributable to Parent BALANCE, shares New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification Other comprehensive gain Other Comprehensive Income (Loss), Net of Tax Issuance of restricted stock, net of forfeitures Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Issuance of restricted stock, net of forfeitures, shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Dividends declared ($1.44 per share) Dividends, Common Stock Stock based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Reclassification of compensation liability to be paid in shares Adjustments to Additional Paid in Capital, Other Purchases of treasury stock Treasury Stock, Value, Acquired, Cost Method Treasury Shares Value Acquired for Benefit Plan Treasury Shares Value Acquired for Benefit Plan Treasury Shares Value Acquired for Benefit Plan Treasury Shares Acquired for Benefit Plan Treasury Shares Acquired for Benefit Plan Treasury Shares Acquired for Benefit Plan Purchases of treasury stock, shares Treasury Stock, Shares, Acquired Restricted stock returned for payment of taxes Restricted Stock, Value, Shares Issued Net of Tax Withholdings Restricted stock returned for payment of taxes, shares Restricted Stock, Shares Issued Net of Shares for Tax Withholdings BALANCE BALANCE, shares Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Stock Issued During Period, Value, New Issues Stock Issued During Period, Value, New Issues Revenue from Contract with Customer [Abstract] Revenue Recognition, Policy [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] 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] Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Income Tax Disclosure [Abstract] Discrete tax expense from stock-based compensation Discrete tax expense from stock-based compensation Discrete tax expense from stock-based compensation Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent 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. Forfeited (shares) GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Subsegments [Axis] Subsegments [Axis] Subsegments [Domain] Subsegments [Domain] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Domain] Subsegments Consolidation Items [Domain] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] ReconciliationFromNetIncomeToNonGaapMeasure [Table Text Block] ReconciliationFromNetIncomeToNonGaapMeasure [Table Text Block] ReconciliationFromNetIncomeToNonGaapMeasure [Table Text Block] DESCRIPTION OF THE BUSINESS Nature of Operations [Text Block] Date of incorporation Entity Incorporation, Date of Incorporation RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] ASSETS Assets [Abstract] Current Assets: Assets, Current [Abstract] Cash and cash equivalents Accounts receivable Accounts Receivable, Net, Current Income Taxes Receivable, Current Income Taxes Receivable, Current Other current assets Other Assets, Current Total current assets Assets, Current Goodwill Goodwill Deferred income taxes Deferred Tax Assets, Net, Noncurrent Intangible assets, net Finite-Lived Intangible Assets, Net Property and equipment, net of accumulated depreciation of $6,916 and $6,462 Property, Plant and Equipment, Net Total assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Dividends payable Dividends Payable, Current Compensation and benefits payable Employee-related Liabilities, Current Income taxes payable Accrued Income Taxes, Current Total current liabilities Liabilities, Current Accrued dividends Dividends Payable Non Current Dividends payable non current. Accrued Income Taxes, Noncurrent Accrued Income Taxes, Noncurrent Deferred rent Deferred Rent Credit, Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Stockholders' Equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.01 par value, authorized 25,000,000 shares, issued 10,336,363 and outstanding 8,944,733 shares at June 30, 2019; issued 10,182,583 and outstanding 8,904,902 shares at December 31, 2018 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Treasury stock, at cost - 1,391,630 shares at June 30, 2019; 1,277,681 shares at December 31, 2018 Treasury Stock, Value Foreign currency translation adjustment Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Retained earnings Retained Earnings (Accumulated Deficit) Total stockholders' equity Total liabilities and stockholders' equity Liabilities and Equity FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Consolidation, Variable Interest Entity, Policy [Policy Text Block] Consolidation, Variable Interest Entity, Policy [Policy Text Block] Components of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] EARNINGS PER SHARE Earnings Per Share [Text Block] Investment Balances Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Document And Entity Information [Abstract] Document and entity information. Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Current Reporting Status Entity Current Reporting Status Entity Shell Company Entity Shell Company Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Operating Segments Operating Segments [Member] Westwood Holdings Corporate, Non-Segment [Member] Eliminations Intersegment Eliminations [Member] Advisory Advisory [Member] Advisory. Trust Trust [Member] Trust. Revenue From External Sources Revenue From External Sources Revenue From External Sources Net intersegment revenues Net Intersegment Revenues Net intersegment revenues. Net interest and dividend revenue Investment Income, Net Other revenue Other revenue Other revenue Economic Earnings Economic Earnings Losses Economic Earnings is a non-U.S. generally accepted accounting principles (“non-GAAP”) performance measure of segment profit or loss. We provide this measure in addition to, but not as a substitute for, net income, which is reported on a U.S. GAAP basis. Both our management and Board of Directors review Economic Earnings to evaluate our ongoing performance, allocate resources and review dividend policy. We believe that this non-GAAP performance measure of segment profit or loss, while not a substitute for GAAP net income, is useful for management and investors when evaluating our underlying operating and financial performance and our available resources. We do not advocate that investors consider this non-GAAP measure of segment profit or loss without considering financial information prepared in accordance with GAAP. Allocated Share-based Compensation Expense Allocated Share-based Compensation Expense Intangible amortization Deferred taxes on goodwill Deferred Other Tax Expense (Benefit) Segment assets Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Investment Advisory Services [Member] Investment Advisory Services [Member] Investment Advisory Services [Member] Mutual Fund Advisory [Member] Mutual Fund Advisory [Member] [Member] Mutual Fund Advisory [Member] [Member] Private Wealth Advisory [Member] Private Wealth Advisory [Member] Private Wealth [Member] Performance-based fees [Member] performance fee [Member] performance fee [Member] Trust Fees [Member] Trust Fee [Member] Trust Fee [Member] Other Revenue Misc Services [Member] Other Revenue Misc Services [Member] Other Revenue Misc Services [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Asia [Member] Asia [Member] Australia AUSTRALIA Canada CANADA Europe [Member] Europe [Member] United States [Member] UNITED STATES Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax Previously Reported [Member] Previously Reported [Member] Restatement Adjustment [Member] Restatement Adjustment [Member] Accounting Standards Update 2016-02 [Member] Accounting Standards Update 2016-02 [Member] Disaggregation of Revenue [Abstract] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] 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] Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Dividends declared per share (dollars per share) Dividends payable, date to be paid Dividends Payable, Date to be Paid Dividends payable, date of record Dividends Payable, Date of Record Components of accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax SEGMENT REPORTING Segment Reporting Disclosure [Text Block] Number of operating segments Number of Reportable Segments Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Scenario [Axis] Target [Axis] Target [Axis] Target [Domain] Target [Domain] [Domain] for Target [Axis] Canadian Plan Canadian Plan [Member] Canadian Plan. Legal Entity Legal Entity [Axis] Entity Entity [Domain] Westwood International Advisors Inc Westwood International Advisors Inc [Member] Westwood International Advisors Inc. Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Mutual Fund [Member] Mutual Fund [Member] 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 Shares remain available for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 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 Fund purchases of common stock Fund Purchases Of Common Stock Fund purchases of common stock. 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. Share price Share Price Amount of shares purchased in the open market Purchases of treasury stock, shares Remaining unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Remaining unrecognized compensation cost recognized over a remaining weighted average period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Nonvested restricted shares Service period of mutual fund share incentive award Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Expense related to mutual fund share incentive awards Accrued liability Mutual Fund Incentive Award Liability Mutual fund incentive award liability. DomesticEmployeeServiceAward [Member] DomesticEmployeeServiceAward [Member] DomesticEmployeeServiceAward [Member] Performance Shares [Member] Performance Shares [Member] DomesticServiceAndPerformanceAward [Member] DomesticServiceAndPerformanceAward [Member] DomesticServiceAndPerformanceAward [Member] CanadianEmployeeServiceAward [Member] CanadianEmployeeServiceAward [Member] CanadianEmployeeServiceAward [Member] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Schedule Of Available For Sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule Of Available For Sale Securities [Line Items] Debt Securities, Available-for-sale [Line Items] Gross Unrealized Gains Gross Unrealized Losses BALANCE SHEET COMPONENTS Stockholders' Equity Note Disclosure [Text Block] SUBSEQUENT EVENTS Subsequent Events [Text Block] Divestiture of Omaha Operations [Table] Cash Proceeds From Divestiture [Table] Cash Proceeds From Divestiture [Table] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Purchase Price Allocation [Axis] Purchase Price Allocation [Axis] Purchase Price Allocation [Axis] Purchase Price Allocation [Domain] Purchase Price Allocation [Domain] [Domain] for Purchase Price Allocation [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Cash Proceeds From Divestiture [Line Items] Cash Proceeds From Divestiture [Line Items] [Line Items] for Cash Proceeds From Divestiture [Table] Accounts payable and accrued liabilities Other liabilities Other Liabilities, Noncurrent Restricted Stock Subject Only to a Service Condition Restricted Stock Subject Only To Service Condition [Member] Restricted stock subject only to service condition. 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. Total Expense Recorded for Stock Based Compensation Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Status and Changes in Restricted Stock Grants that Subject to Service Condition Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] 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. Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value Hierarchy Including NAV [Axis] Fair Value Hierarchy Including NAV [Axis] Fair Value Hierarchy Including NAV [Axis] Fair Value Hierarchy Including NAV [Domain] Fair Value Hierarchy Including NAV [Domain] [Domain] for Fair Value Hierarchy Including NAV [Axis] Inputs, Net Asset Value [Member] Inputs, Net Asset Value [Member] Inputs, Net Asset Value [Member] Investments in securities: Investments, Fair Value Disclosure [Abstract] Investments in trading securities Alternative Investment Alternative Investment Fair Value, Net Asset (Liability) Fair Value, Net Asset (Liability) Fee revenues from Westwood VIEs Variable Interest Entity, Measure of Activity, Revenues