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Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents United States [Member] UNITED STATES Common stock, par value (dollars per share) Common Stock, Par or Stated Value Per Share VARIABLE INTEREST ENTITIES Variable Interest Entity Disclosure [Text Block] Current Assets: Assets, Current [Abstract] Gross Unrealized Losses Debt Securities, Trading, Unrealized Loss Leases [Abstract] Leases [Abstract] Entity Central Index Key Entity Central Index Key Security Exchange Name Security Exchange Name Private Wealth Advisory [Member] Private Wealth Advisory [Member] Private Wealth [Member] Restricted stock returned for payment of taxes, shares Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Advisory Advisory [Member] Advisory. 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Gross Unrealized Gains Debt Securities, Trading, and Equity Securities, Unrealized Gain Debt Securities, Trading, and Equity Securities, Unrealized Gain Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Investment Income, Investment Expense Investment Income, Investment Expense Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Investing Activities Disaggregation of Revenue [Abstract] Disaggregation of Revenue [Abstract] Change in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Property and equipment, accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Vested (dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Total current liabilities Liabilities, Current Restricted stock returned for payment of taxes Payment, Tax Withholding, Share-based Payment Arrangement Eliminations Intersegment Eliminations [Member] Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax Unrealized Loss on Securities Unrealized Loss on Securities Unrealized Gains (Losses) on Private Investments Unrealized Gains (Losses) on Private Investments Unrealized Gains (Losses) on Private Investments Money market funds Money Market Funds [Member] Revenue from Contract with Customer, Including Assessed Tax Revenue from Contract with Customer, Including Assessed Tax Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Investment Performance [Member] Investment Performance [Member] Revenue Disaggregation by Geographic Location [Table Text Block] Revenue Disaggregation by Geographic Location [Table Text Block] [Table Text Block] for Revenue Disaggregation by Geographic Location [Table] stock repurchase program stock repurchase program stock repurchase program - authorization increase subsequent to financial statement date Fee revenues from Westwood VIEs Variable Interest Entity, Measure of Activity, Revenues Title of 12(b) Security Title of 12(b) Security Mutual Fund [Member] Mutual Fund [Member] Statement [Table] Statement [Table] Other current assets Other Assets, Current Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Statistical Measurement [Axis] Statistical Measurement [Axis] Payment for Repurchases of Stock for Benefit Plan Payment for Repurchases of Stock for Benefit Plan Payment for Repurchases of Stock for Benefit Plan Adjustments to Additional Paid in Capital, Other Adjustments to Additional Paid in Capital, Other Subsequent Event [Member] Subsequent Event [Member] Investment Advisory Services [Member] Investment Advisory Services [Member] Investment Advisory Services [Member] Intangible assets, net Finite-Lived Intangible Assets, Net Goodwill Goodwill Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Subsequent Event, Description Subsequent Event, Description Share repurchase - open market average price Share repurchase - open market average price Share repurchase - open market average price Gross Unrealized Losses Debt Securities, Trading, and Equity Securities, Unrealized Loss Debt Securities, Trading, and Equity Securities, Unrealized Loss Income taxes payable Accrued Income Taxes, Current Investments Measured at NAV Fair Value Measured at Net Asset Value Per Share [Member] DESCRIPTION OF THE BUSINESS Nature of Operations [Text Block] Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Scenario [Domain] Scenario [Domain] Unobservable input -book value multiple - maximum Unobservable input -book value multiple - maximum Unobservable input -book value multiple - maximum Subsequent Event Type [Axis] Subsequent Event Type [Axis] Geographic Distribution [Axis] Geographic Distribution [Axis] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Deferred income taxes Deferred Income Tax Expense (Benefit)