Goodwill and Intangible Assets Disclosure [Abstract] Estimated amortization expense for intangible assets for the next five years Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2019 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Five Risks and Uncertainties [Abstract] Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Benchmark Concentration Risk Benchmark [Axis] Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Sales Revenue, Net Sales Revenue, Net [Member] Concentration Risk Type Concentration Risk Type [Axis] Concentration Risk Type Concentration Risk Type [Domain] Customer Concentration Risk Customer Concentration Risk [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Number of largest clients Number Of Major Customers Revenue accounted by major clients Concentration Risk, Percentage Variable Interest Entities [Abstract] Variable interest entities. VARIABLE INTEREST ENTITIES Variable Interest Entity Disclosure [Text Block] Banking and Thrift [Abstract] REGULATORY CAPITAL REQUIREMENTS Regulatory Capital Requirements under Banking Regulations [Text Block] Revenue from Contract with Customer [Abstract] Revenue Recognition, Policy [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] EMPLOYEE BENEFITS Compensation and Employee Benefit Plans [Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Business Acquisition Common Stock Issuance [Axis] Business Acquisition Common Stock Issuance [Axis] Business Acquisition Common Stock Issuance [Axis] Business Acquisition Common Stock Issuance [Domain] Business Acquisition Common Stock Issuance [Domain] [Domain] for Business Acquisition Common Stock Issuance [Axis] Woodway Financial Advisors Woodway Financial Advisors [Member] Woodway financial advisors. Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Westwood Holdings Group, Inc. Common Stock, Par Common Stock [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Treasury Stock Treasury Stock [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Retained Earnings Retained Earnings [Member] Statement [Line Items] Statement [Line Items] New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification BALANCE Stockholders' Equity Attributable to Parent BALANCE, shares Common Stock, Shares, Outstanding Net income Net Income (Loss) Attributable to Parent Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Stock Issued During Period, Value, New Issues Stock Issued During Period, Value, New Issues Issuance of common stock for acquisition, shares Stock Issued During Period, Shares, Acquisitions Issuance of common stock for acquisition Stock Issued During Period, Value, Acquisitions 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 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 Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation Dividends declared ($2.07 in 2015, $1.82 per share in 2014, $1.64 per share in 2013) Dividends, Common Stock Purchases of treasury stock Treasury Stock, Value, Acquired, Cost Method Purchases of treasury stock, shares Treasury Stock, Shares, Acquired Issuance of treasury stock under employee stock plans, shares Stock Issued During Period, Shares, Share-based Compensation, Gross Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Issuance of treasury stock under employee stock plans Stock Issued During Period, Value, Share-based Compensation, Gross 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 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 [Axis] Award Type [Axis] Equity Award [Domain] 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, January 1, 2015 (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Non-vested, December 31, 2015 (in shares) Non-vested, January 1, 2015 (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Non-vested, December 31, 2015 (in dollars per share) 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 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] Adoption of ASU 2016-09 [Member] Adoption of ASU 2016-09 [Member] Adoption of ASU 2016-09 [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Estimated lease asset and net lease liability for ASU 2016-02 Estimated lease asset and net lease liability for ASU 2016-02 Estimated lease asset and net lease liability for ASU 2016-02 Provision for income taxes Income Tax Expense (Benefit) Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Tax rate excluding ASU 2016-09 adoption Tax rate excluding ASU 2016-09 adoption Tax rate excluding ASU 2016-09 adoption Finite-Lived Intangible Assets Disposed [Abstract] Finite-Lived Intangible Assets Disposed [Abstract] Finite-Lived Intangible Assets Disposed [Table] Finite-Lived Intangible Assets Disposed [Table] Finite-Lived Intangible Assets Disposed [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer Relationships [Member] Customer Relationships [Member] Trade Names [Member] Trade Names [Member] Noncompete Agreements [Member] Noncompete Agreements [Member] Finite-Lived Intangible Assets Disposed [Line Items] Finite-Lived Intangible Assets Disposed [Line Items] [Line Items] for Finite-Lived Intangible Assets Disposed [Table] Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets Sold, Accumulated Amortization Finite-Lived Intangible Assets Sold, Accumulated Amortization Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets Sold, Net Finite-Lived Intangible Assets Sold, Net Finite-Lived Intangible Assets Sold, Gross Finite-Lived Intangible Assets Sold, Gross Finite-Lived Intangible Assets Sold, Gross Segment Reporting [Abstract] Schedule Of Segment Reporting Information By Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Asset Management [Member] Asset Management [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Westwood Holdings Corporate, Non-Segment [Member] Eliminations Intersegment Eliminations [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Advisory [Member] Advisory [Member] Advisory. Trust [Member] Trust [Member] Trust. Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] 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 Total revenues Revenues Expenses: Operating Expenses [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Other operating expenses Other Cost and Expense, Operating Total expenses Operating Expenses Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax expense (benefit) Restricted stock expense Share-based Compensation Amortization of intangible assets Amortization of Intangible Assets Deferred taxes on goodwill Deferred Other Tax Expense (Benefit) Economic Earnings (Loss) 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. Assets Assets Segment goodwill Goodwill Expenditures for long-lived assets Payments to Acquire Property, Plant, and Equipment Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type Property, Plant and Equipment, Type [Domain] Leasehold improvements Leasehold Improvements [Member] Furniture and fixtures Furniture and Fixtures [Member] Computer hardware and office equipment Computer Hardware And Office Equipment [Member] Computer hardware and office equipment. Construction in progress Construction in Progress [Member] Property Plant And Equipment [Line Items] Property, Plant and Equipment [Line Items] Property and equipment Property, Plant and Equipment, Net [Abstract] Property and equipment cost Property, Plant and Equipment, Gross Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Net property and equipment Property, Plant and Equipment, Net Add: Tax benefit from goodwill amortization 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. Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Weighted-average grant date fair value for shares granted and the total fair value of shares vested Share Based Compensation Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value And Fair Value Of Shares Vested [Abstract] Weighted-average grant date fair value (in dollars per share) Fair value of shares vested (in thousands) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Vested, shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period DESCRIPTION OF THE BUSINESS Nature of Operations [Text Block] Investments, Debt and Equity Securities [Abstract] Investment Balances Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Other Revenue Gain (Loss) on Securities [Table Text Block] Revenue from Contract with Customer [Text Block] Revenue from Contract with Customer [Text Block] Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Restricted Stock Subsequent Event Type Subsequent Event Type [Axis] Subsequent Event Type Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Dividends declared per share Common Stock, Dividends, Per Share, Declared Stock Issued During Period, Value, Restricted Stock Award, Gross Stock Issued During Period, Value, Restricted Stock Award, Gross Restricted stock issued Stock Issued During Period, Shares, Restricted Stock Award, Gross Commitments and Contingencies Disclosure [Abstract] Litigation Settlement, Expense Litigation Settlement, Expense Future contractual rental payments for non-cancelable operating leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2020 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2022 Operating Leases, Future Minimum Payments, Due in Four Years 2023 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total payments due Operating Leases, Future Minimum Payments Due Income Tax Disclosure [Abstract] INCOME TAXES Income Tax Disclosure [Text Block] Accounting Policies [Abstract] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Tax Reform [Table] Tax Reform [Table] Tax Reform [Table] Tax Reform [Axis] Tax Reform [Axis] Tax Reform [Axis] Tax Reform [Domain] Tax Reform [Domain] [Domain] for Tax Reform [Axis] Tax Year 2017 [Member] Tax Year 2017 [Member] Tax Reform [Line Items] Tax Reform [Line Items] [Line Items] for Tax Reform [Table] Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Prepaid Taxes Prepaid Taxes Repatriation Earnings and Profits Repatriation Earnings and Profits Repatriation Earnings and Profits U.S. Federal corporate tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Penalties and interest Income Tax Examination, Penalties and Interest Expense Foreign Earnings Repatriated Undistributed Earnings of Foreign Subsidiaries Unrecognized deferred tax liability Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries Uncertain tax position Unrecognized Tax Benefits Reasonably possible maximum decrease in uncertain tax position Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Decrease in income tax provision Significant Change in Income Tax Provision is Reasonably Possible, Amount of Unrecorded Benefit Significant Change in Income Tax Provision is Reasonably Possible, Amount of Unrecorded Benefit Additions for tax positions related to the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount Taxes Payable Taxes Payable Accrued Income Taxes, Noncurrent Accrued Income Taxes, Noncurrent INVESTMENTS Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] U.S. UNITED STATES Canada CANADA 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 Minimum capital requirement Capital Required for Capital Adequacy Excess from Minimum capital requirement Excess Capital Required combined cash and receivables Foreign Financial Institutions, Mandated Reserve Amount Combined cash and receivables Foreign Financial Institutions, Actual Reserve Amount Fair Value Disclosures [Abstract] FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [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 Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Shell Company Entity Shell Company Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Significant Accounting Policy [Table] Significant Accounting Policy [Table] Significant accounting policy. Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Westwood International Advisors Inc Westwood International Advisors Inc [Member] Westwood International Advisors Inc. Canadian Plan Canadian Plan [Member] Canadian Plan. Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Schedule Of Significant Accounting Policies [Line Items] Schedule Of Significant Accounting Policies [Line Items] Schedule of significant accounting policies. Foreign Currency Transaction Gain (Loss), before Tax Foreign Currency Transaction Gain (Loss), before Tax Number of reporting units Number of Reporting Units Goodwill impairment loss Goodwill, Impairment Loss Estimated useful lives of the assets Property, Plant and Equipment, Useful Life Estimated useful lives of the assets Property, Plant and Equipment, Estimated Useful Lives Compensation expense recorded Allocated Share-based Compensation Expense Valuation allowance Deferred Tax Assets, Valuation Allowance Unrecognized tax benefits Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies Schedule Of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Member] Variable Interest Entity [Member] Variable interest entity. Common Trust Funds Common Trust Funds [Member] Common trust funds. UCITS Fund [Member] UCITS Fund [Member] UCITS Fund [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Investments in trading securities Debt Securities, Trading, and Equity Securities, FV-NI Fee revenues from Westwood VIEs Variable Interest Entity, Measure of Activity, Revenues Earnings Per Share, Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Principles of consolidation Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Accounts Receivable Receivables, Policy [Policy Text Block] Investments Investment, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Stock Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Currency Translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Business Combinations Business Combinations Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Tax Credits used to pay Federal cash taxes Tax Credits used to pay Federal cash taxes Tax Credits used to pay Federal cash taxes Net deferred tax assets and liabilities are reflected on our balance sheet Deferred Tax Assets, Net, Classification [Abstract] Net deferred tax assets Deferred Tax Assets, Net SEGMENT REPORTING Segment Reporting Disclosure [Text Block] Service condition restricted stock expense Restricted Shares Subject To Service Condition [Member] Restricted shares subject to service condition. Deferred tax assets: Deferred Tax Assets, Net [Abstract] Share-based compensation expense Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Deferred rent Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent Compensation and benefits payable Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits Federal unrecognized tax benefit Other Deferred Tax Assets, Other Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Deferred Tax Liabilities, Net [Abstract] Property and equipment Deferred Tax Liabilities, Property, Plant and Equipment Intangibles Deferred Tax Liabilities, Intangible Assets Unrealized gains on investments Deferred Tax Liabilities, Unrealized Gains on Trading Securities Total deferred tax liabilities Deferred Tax Liabilities, Net Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [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] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition [Line Items] Business Acquisition [Line Items] Proceeds from Divestiture of Businesses Proceeds from Divestiture of Businesses Date of incorporation Entity Incorporation, Date of Incorporation Cash and stock Business Combination, Consideration Transferred, Cash and Equity Interests Issued and Issuable Business Combination, Consideration Transferred, Cash and Equity Interests Issued and Issuable Maximum earn-out amount Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Estimated merger consideration Business Combination, Consideration Transferred Closing sate consideration paid in cash Payments to Acquire Businesses, Gross Common stock issued for acquisition Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Value of shares before discount Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Contingent consideration Business Combination, Contingent Consideration, Liability Accounts receivable Accounts Receivable, Net, Current Other current assets Other Assets, Current Goodwill Intangible assets, net Finite-Lived Intangible Assets, Net Property and equipment, net of accumulated depreciation of $6,462 and $5,673 Accounts Payable and Accrued Liabilities, Current Accounts Payable and Accrued Liabilities, Current Other Liabilities, Noncurrent Other Liabilities, Noncurrent Quarterly Financial Information Disclosure [Abstract] QUARTERLY FINANCIAL DATA (Unaudited) Quarterly Financial Information [Text Block] Property and Equipment Property, Plant and Equipment [Table Text Block] Components of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule Of Finite Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] General and Administrative Expense [Member] General and Administrative Expense [Member] Internally developed software Software and Software Development Costs [Member] Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Summary of intangible assets Intangible Assets, Net (Excluding Goodwill) [Abstract] Weighted Average Amortization Period (years) Finite-Lived Intangible Asset, Weighted Average Period before Next Renewal or Extension Gross Carrying Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Carrying Amount Income (Loss) Before Income Taxes by Jurisdiction Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Difference between the Federal Corporate Tax Rate and the Effective Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Income Tax Provision (Benefit) as Set Forth in the Consolidated Statements of Income Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Deferred Tax Assets and Deferred Tax Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Unrecognized Tax Benefits Roll Forward Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] CONCENTRATION Concentration Risk Disclosure [Text Block] Future Contractual Rental Payments for Non-Cancelable Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Discontinued Operations and Disposal Groups [Abstract] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] 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] Current taxes: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] US Federal Current Federal Tax Expense (Benefit) State and local Current State and Local Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) Total current taxes Current Income Tax Expense (Benefit) Deferred taxes: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] US Federal Deferred Federal Income Tax Expense (Benefit) State and local Deferred State and Local Income Tax Expense (Benefit) Foreign Deferred Foreign Income Tax Expense (Benefit) Total deferred taxes Deferred Income Tax Expense (Benefit) Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature Loss Contingency Nature [Axis] Loss Contingency, Nature Loss Contingency, Nature [Domain] General Damage General Damage [Member] General damage. Special Damage Special Damage [Member] Special damage. Punitive Damage Punitive Damage [Member] Punitive damage. Insurance Settlement [Member] Insurance Settlement [Member] Litigation Case Litigation Case [Axis] Litigation Case Litigation Case [Domain] First Lawsuit By A G F First Lawsuit By A G F [Member] First lawsuit by AGF. Second Lawsuit by AGF Second Lawsuit By A G F [Member] Second lawsuit by AGF. Loss Contingencies [Line Items] Loss Contingencies [Line Items] Rental expense for facilities and equipment leases Operating Leases, Rent Expense Lawsuit filing date Loss Contingency, Lawsuit Filing Date Litigation claim for damages Loss Contingency, Damages Sought, Value Litigation Settlement, Amount Awarded to Other Party Litigation Settlement, Amount Awarded to Other Party Gain (Loss) Related to Litigation Settlement Gain (Loss) Related to Litigation Settlement Percentage of defense costs which will be covered by insurance Percentage Of Defense Costs Covered By Insurance Percentage of defense costs covered by insurance. Insurance proceeds Proceeds from Insurance Settlement, Operating Activities Loss contingency, receivable Loss Contingency, Receivable, Current Restricted Stock Subject Only to a Service Condition Restricted Stock Subject Only To Service Condition [Member] Restricted stock subject only to service condition. Restricted Shares Subject to Service and Performance Conditions 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] Weighted-Average Grant Date Fair Value for Shares Granted and the Total Fair Value of Shares Vested Share Based Compensation Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value And Fair Value Of Shares Vested Table [Text Block] Share based compensation award equity instruments other than options grants in period weighted average grant date fair value and fair value of shares vested. Profit Sharing and 401(k) Contributions for the Periods Defined Contribution Plan Disclosures [Table Text Block] Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Components of accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation adjustment, net of tax of $(43) and $46 Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Foreign currency translation adjustment, tax Accumulated Other Comprehensive Income (Loss), Tax Accumulated Other Comprehensive Income (Loss), Tax Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Treasury Stock Acquired, Average Cost Per Share Treasury Stock Acquired, Average Cost Per Share Treasury Stock, Value, Acquired, Cost Method Stock Repurchased During Period, Value Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] 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] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] 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 Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Investments in securities: Investments, Fair Value Disclosure [Abstract] Total assets measured at fair value Fair Value, Net Asset (Liability) Summary of Quarterly Results of Operations Quarterly Financial Information [Table Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Other Revenue Misc Services [Member] Other Revenue Misc Services [Member] Other Revenue Misc Services [Member] performance fee [Member] performance fee [Member] performance fee [Member] Trust Fee [Member] Trust Fee [Member] Trust Fee [Member] Investment Advisory Services [Member] Investment Advisory Services [Member] Investment Advisory Services [Member] Mutual Fund Advisory [Member] [Member] Mutual Fund Advisory [Member] [Member] Mutual Fund Advisory [Member] [Member] Private Wealth Advisory [Member] Private Wealth Advisory [Member] Private Wealth [Member] UNITED STATES Europe [Member] Europe [Member] CANADA AUSTRALIA AUSTRALIA Asia [Member] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Duration [Axis] Contract with Customer, Duration [Axis] Contract with Customer, Duration [Domain] Contract with Customer, Duration [Domain] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Customer [Axis] Customer [Axis] Customer [Domain] Customer [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 Earnings Per Share [Abstract] Computation of Basic and Diluted Shares Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule Of Available For Sale Securities [Table] Schedule of Available-for-sale Securities [Table] Investment Type Investment Type [Axis] Investments Investments [Domain] U.S. Government and Government agency obligations US Treasury and Government [Member] Money market funds Money Market Funds [Member] Equity funds Equity Funds [Member] Schedule Of Available For Sale Securities [Line Items] Debt Securities, Available-for-sale [Line Items] Investment balances Debt Securities, Trading, Restricted [Abstract] Cost Trading Securities, Cost Gross Unrealized Gains Trading Securities, Unrealized Holding Gain Gross Unrealized Losses Trading Securities, Unrealized Holding Loss BALANCE SHEET COMPONENTS Supplemental Balance Sheet Disclosures [Text Block] 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] 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 or options Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Westwood Funds Westwood Funds [Member] Westwood funds. Limited Liability Company [Member] Limited Liability Company [Member] Westwood Hospitality Fund I LLC [Member] Westwood Hospitality Fund I LLC [Member] Westwood Hospitality Fund I LLC [Member] Private Wealth Private Wealth [Member] Private wealth. Institutional Institutional [Member] Institutional. Variable Interest Entities Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] Assets Under Management Assets under Management, Carrying Amount Corporate Investment Amount at Risk Risk Of Loss The risk of loss on Investment in VIE. Profit sharing and 401(k) contributions for the periods Profit Sharing And Contributions [Abstract] Profit-sharing contributions Profit Sharing Contribution Profit sharing contribution. Retirement plan matching contributions Defined Contribution Plan, Employer Discretionary Contribution Amount Investment Performance [Member] Investment Performance [Member] Westwood Management Westwood Management [Member] Westwood management. Revenue from Contract with Customer, Excluding Assessed Tax 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 Unrealized (gains) losses on trading investments Trading Securities, Change in Unrealized Holding Gain (Loss) Stock-based compensation expense Deferred income taxes Increase (Decrease) in Deferred Income Taxes Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Gain on sale of operations Gain on sale of operations Gain on sale of operations Gain on sale of operations Other Operating Activities, Cash Flow Statement Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Net (purchases) sales 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] Acquisition of Woodway, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Purchases of property, equipment and other Payments to Acquire Productive Assets Payments to Acquire Investments Payments to Acquire Investments Proceeds from Sale of Property, Plant, and Equipment Proceeds from Sale of Property, Plant, and Equipment 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 Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Other Payments to Acquire Businesses Other Payments to Acquire Businesses 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 increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of year Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of year Supplemental cash flow information: Supplemental Cash Flow Elements [Abstract] Cash paid during the year for income taxes Income Taxes Paid, Net Non-cash accrued contingent consideration Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Accrued dividends Dividends Declared Dividends Declared Noncash Tenant Improvements Noncash Tenant Improvements Noncash Tenant Improvements Non Cash Accrued PP&E Non Cash Accrued PP&E Non Cash Accrued PP&E Difference between the Federal corporate tax rate and the effective tax rate Effective Income Tax Rate Reconciliation, Amount [Abstract] Income tax provision computed at US federal statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Canadian rate differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Change in uncertain tax positions, net of federal income taxes Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount State and local income taxes, net of federal income taxes Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Income tax provision computed at US federal statutory rate, effective tax rate Canadian rate differential, effective tax rate Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Change in uncertain tax positions, net of federal income taxes, effective tax rate Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Percent Global Intangible Low Taxed Income, Net Deductions Global Intangible Low Taxed Income, Net Deductions Global Intangible Low Taxed Income, Net Deductions Global Intangible Low Taxed Income, Percent Global Intangible Low Taxed Income, Percent Global Intangible Low Taxed Income, Percent State and local income taxes, net of federal income taxes, effective tax rate Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Effective Income Tax Rate Reconciliation, Tax Credit, Amount Effective Income Tax Rate Reconciliation, Tax Credit, Amount Effective Income Tax Rate Reconciliation, Tax Credit, Percent Effective Income Tax Rate Reconciliation, Tax Credit, Percent Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent Other, net, effective tax rate Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective income tax rate Intersegment Balances Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Economic Earnings Schedule of Economic Earnings [Table Text Block] Schedule of Economic Earnings [Table Text Block] Revenues by Geographic Location Revenue from External Customers by Geographic Areas [Table Text Block] Property and Equipment, Net by Geographic Area Long-lived Assets by Geographic Areas [Table Text Block] Statement of Financial Position [Abstract] Property and equipment, accumulated depreciation Common stock, par value 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 Treasury stock, shares Treasury Stock, Shares Changes in goodwill Goodwill [Roll Forward] Beginning balance Goodwill Acquired Goodwill, Acquired During Period Goodwill, Written off Related to Sale of Business Unit Goodwill, Written off Related to Sale of Business Unit Ending balance Service condition restricted stock expense Stock Based Compensation Expense Subject To Service Condition [Member] Stock based compensation expense subject to service condition. Performance-based restricted stock expense Stock Based Compensation Expense Subject To Performance Condition [Member] Stock based compensation expense subject to performance condition. Restricted stock expense under the Plan Stock Based Compensation Expense [Member] Stock based compensation expense. Canadian Plan restricted stock expense Canadian Plan Restricted Stock Expense [Member] Canadian plan restricted stock expense. Add: Restricted stock expense Total income tax benefit recognized related to stock-based compensation Employee Service Share-based Compensation, Tax Benefit from Compensation Expense SUBSEQUENT EVENTS Subsequent Events [Text Block] EARNINGS PER SHARE Earnings Per Share [Text Block] Total revenues Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Dividends declared, per share Dividends Payable, Amount Per Share Income (loss) before income taxes by jurisdiction Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest [Abstract] United States Income (Loss) from Continuing Operations before Income Taxes, Domestic Canada Income (Loss) from Continuing Operations before Income Taxes, Foreign Number of operating segments Number of Reportable Segments Investments, All Other Investments [Abstract] Long-term Investments Long-term Investments Private Equity Investment Commitment Private Equity Investment Commitment Private Equity Investment Commitment Private Equity Investment Purchase Private Equity Investment Purchase Private Equity Investment Purchase Income Statement [Abstract] Fiduciary and Trust [Member] Fiduciary and Trust [Member] Restatement [Axis] Restatement [Axis] Restatement [Domain] Restatement [Domain] Revenue from Contract with Customer, Including Assessed Tax Revenue from Contract with Customer, Including Assessed Tax Other Revenue, Net Other Revenue, Net Other Revenue, Net Revenues: Revenues [Abstract] 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 Total expenses Costs and Expenses Operating Income (Loss) Operating Income (Loss) Net income Other comprehensive income (loss), net of tax: 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 Other comprehensive income (loss) Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Earnings per share: Basic (in dollars per share) Diluted (in dollars per share) Weighted average shares outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Concentration Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Values of Assets Within Fair Value Hierarchy Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Fair Value Inputs, Liabilities, Quantitative Information Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Changes in Goodwill Schedule of Goodwill [Table Text Block] Summary of Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Finite-Lived Intangible Assets Disposed [Table Text Block] Finite-Lived Intangible Assets Disposed [Table Text Block] [Table Text Block] for Finite-Lived Intangible Assets Disposed [Table] Amortization expense Estimated Amortization Expense for Intangible Assets over the Next Five Years Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at January 1, 2017 Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Additions for tax positions related to prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Balance at December 31, 2017 Realized gains Trading Securities, Realized Gain Realized losses Trading Securities, Realized Loss Net realized gains (losses) Trading Securities, Realized Gain (Loss) Income tax expense (benefit) from gains (losses) Income Tax Benefit Expense On Securities Transactions Income tax benefit expense on securities transactions. Interest income – trading Interest and Dividend Income, Securities, Operating, Trading or Measured at Fair Value Dividend income Investment Income, Dividend Unrealized gains/(losses) ASSETS Assets [Abstract] Current Assets: Assets, Current [Abstract] Cash and cash equivalents Investments, at fair value Short-term Investments Total current assets Assets, Current Deferred income taxes Deferred Tax Assets, Net, Noncurrent LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Current Liabilities: Liabilities, Current [Abstract] Accounts payable and accrued liabilities Dividends payable Dividends Payable, Current Compensation and benefits payable Employee-related Liabilities, Current Contingent consideration Business Combination, Contingent Consideration, Liability, Current Income taxes payable Accrued Income Taxes, Current Total current liabilities Liabilities, Current Accrued dividends Dividends Payable Non Current Dividends payable non current. Deferred rent Deferred Rent Credit, Noncurrent Total long-term liabilities Liabilities, 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 10,182,583 and outstanding 8,904,902 shares at December 31, 2018; issued 9,980,827 and outstanding 8,899,587 shares at December 31, 2017 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Treasury stock, at cost – 1,277,681 shares at December 31, 2018; 1,081,240 shares at December 31, 2017 Treasury Stock, Value Accumulated other comprehensive loss Retained earnings Retained Earnings (Accumulated Deficit) Total stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Computation of Basic and Diluted Shares Earnings Per Share Reconciliation [Abstract] Weighted average shares outstanding – basic (in shares) Dilutive potential shares from unvested restricted shares (in shares) Incremental Common Shares Attributable To Nonvested Restricted Shares Incremental common shares attributable to nonvested restricted shares. Dilutive potential shares from contingent consideration (in shares) Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Weighted average shares outstanding – diluted (in shares) Earnings per share: Earnings Per Share, Basic and Diluted [Abstract] Schedule of Investments [Abstract] Schedule Of Investments [Table] Schedule of Investments [Table] Schedule Of Investments [Line Items] Schedule of Investments [Line Items] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Benefit Plans [Member] Benefit Plans [Member] Benefit plans. 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] Performance Shares Performance Shares [Member] Performance​ Based​ Restricted​ Shares​ For Future Performance Years Performance Based Restricted Shares For Future Performance Years [Member] Performance​ based​ restricted​ shares​ for future performance years. Deferred Compensation Share Based Payments Deferred Compensation, Share-based Payments [Member] Title of Individual Title of Individual [Axis] Relationship to Entity Relationship to Entity [Domain] Employee Employee [Member] Employee [Member] Director Director [Member] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Domain] Vesting Vesting [Axis] Vesting Vesting [Domain] Share-based Compensation Award, Tranche One Share-based Compensation Award, Tranche One [Member] Share-based Compensation Award, Tranche Two Share-based Compensation Award, Tranche Two [Member] Share-based Compensation Award, Tranche Three Share-based Compensation Award, Tranche Three [Member] Share Based Compensation Award Tranche Four Share Based Compensation Award Tranche Four [Member] Share based compensation award tranche four. 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 Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Shares remain available for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 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 Number of shares purchased in the open market Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award Amount of shares purchased in the open market Fair value of vested shares Treasury Stock, Common, Shares Treasury Stock, Common, Shares Purchase 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 Number of vested shares from employees on the date vesting Shares Paid for Tax Withholding for Share Based Compensation Restricted shares granted to employees vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Adjusted pre-tax income Share Pretax Income Goal Share pretax income goal. Share Pretax Income Goal Sliding Scale Award Share Pretax Income Goal Sliding Scale Award Share Pretax Income Goal Sliding Scale Award Percentage of Pretax income Goal Earned Percentage of Pretax income Goal Earned Percentage of Pretax income Goal Earned Nonvested restricted shares (in shares) Percentage of deferred share units vesting Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Accrued liability Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent Deferred share units, issued and outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Issued And Outstanding In Period Gross Share based compensation arrangement by share based payment award options issued and outstanding in period gross. Mutual fund vesting period Share Based Compensation Arrangement With Individual Requisite Service Period Share based compensation arrangement with individual requisite service period. Service period of mutual fund share incentive award Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Accrued liability Mutual Fund Incentive Award Liability Mutual fund incentive award liability. Vesting period Defined Contribution Plan Specified Period Of Service For Employer Profit Sharing Contributions To Be Fully Vested Defined contribution plan specified period of service for employer profit sharing contributions to be fully vested. Percentage of compensation Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay