Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Class A [Member] Common Class A [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Sierra Income Corporation [Member] Sierra Income Corporation [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Expense Support and Reimbursement Agreement [Member] Expense Support And Reimbursement Agreement [Member] MCC Admin Agreement [Member] Mcc Admin Agreement [Member] SIC Admin Agreement [Member] Sic Admin Agreement [Member] Funds Admin Agreement [Member] Funds Admin Agreement [Member] Funds Admin Agreement [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Operating expenses percentage Operating Expenses Percentage Operating expenses percentage. Conditional obligation reimbursement period Conditional Obligation Reimbursement Period Conditional Obligation Reimbursement Period Liability for ESA expenses Due to Related Parties Expense support and reimbursement agreement expenses Expense support and reimbursement agreement expenses Amount of expenses incurred for expense support and reimbursement agreements during the reporting period. Administrative services revenue Administrative Services Revenue Accrued fees and other revenue receivable Accrued Fees and Other Revenue Receivable Equity method investments, at fair value Equity Method Investments, Fair Value Disclosure Available-for-sale securities Available-for-sale Securities Publicly traded common stock (in shares) Available For Sale Securities, Shares Available For Sale Securities, Shares Cumulative unrealized gains Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax Common stock exchange ratio Common Stock Exchange Ratio Common Stock Exchange Ratio Percentage of tax benefit under tax receivable agreement Percentage of tax benefit under tax receivable agreement Represent the percentage of tax benefit under tax receivable agreement. Income Statement [Abstract] Statement [Table] Statement [Table] Consolidated Subsidiaries [Member] Consolidated Subsidiaries [Member] Consolidated Subsidiaries [Member] Medley LLC [Member] Medley Limited Liability Corporation [Member] Medley Limited Liability Corporation [Member]. Statement [Line Items] Statement [Line Items] Revenues Revenues [Abstract] Management fees (includes Part I incentive fees of $544 and $3,369, respectively) Management Fees Revenue Performance fees Performance Fees Other revenues and fees Fees and Commissions, Other Total revenues Revenues Expenses Operating Expenses [Abstract] Compensation and benefits Labor and Related Expense Performance fee compensation Performance Fee Compensation Includes compensation to our professionals directly related to performance fees. General, administrative and other expenses General and Administrative Expense Total expenses Operating Expenses Other income (expense) Other Income and Expenses [Abstract] Dividend income Investment Income, Dividend Interest expense Interest Expense Other income (expense), net Other Operating Income (Expense), Net Total other expense, net Total Other Operating Income Expense Net Represents the amount of other operating income (expense), net during the reporting period. Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income (loss) attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to Medley Management Inc. Net Income (Loss) Attributable to Parent Dividends declared per Class A common stock (in dollars per share) Common Stock, Dividends, Per Share, Declared Net income (loss) per Class A common stock: Earnings Per Share [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Weighted average number shares outstanding - Basic and Diluted (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule Of Organization And Basis Of Presentation [Table] Schedule Of Organization And Basis Of Presentation [Table] Common Class B [Member] Common Class B [Member] Organization And Basis Of Presentation [Line Items] Organization And Basis Of Presentation [Line Items] Number of reportable segments Number of Reportable Segments Date of incorporation Entity Incorporation, Date of Incorporation Commencement of operations date Operations Commenced Date Proceeds from Initial Public Offering Proceeds from Issuance Initial Public Offering Issuance of Class A shares in Initial Public Offering, net of underwriters discount (in shares) Stock Issued During Period, Shares, New Issues Issuance of Class A shares, offering price (in dollars per share) Sale of Stock, Price Per Share Percentage of common stock owned by LLC personnel for voting rights entitlement, minimum Limited Liability Company LLC, Percentage of Common Stock, Minimum This element represents the minimum percentage of common stock that should be held by the pre-IPO members. Voting rights multiplier upon LLC ownership threshold Limited Liability Company LLC, ship Unit, Voting Rights Description of voting rights of membership units issued of limited liability company (LLC). Conversion of pre-IPO interests to LLC Units (in shares) Stock Issued During Period, Shares, Conversion of Units Basis of exchange of LLC Units for Class A shares Basis Of Exchange Of Units For Shares Represents the basis of exchange of units for shares under exchange agreement. Transfer of units to common stock, prior to fourth anniversary Transfer of Units to Common Stock, Threshold before Fourth Anniversary Transfer of Units to Common Stock, Threshold before Fourth Anniversary Transfer of units to common stock, prior to fifth anniversary Transfer of Units to Common Stock, Threshold before Fifth Anniversary Transfer of Units to Common Stock, Threshold before Fifth Anniversary Temporary Equity Disclosure [Abstract] Redeemable Non-controlling Interests Redeemable Noncontrolling Interest [Text Block] Redeemable Noncontrolling Interest [Text Block] Debt Disclosure [Abstract] LOANS PAYABLE Debt Disclosure [Text Block] Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Schedule of Investments [Abstract] Total investments, at fair value Investments, Fair Value Disclosure Dividends paid per Class A common stock (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Antidilutive securities excluded from computation of earnings per share (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Payables and Accruals [Abstract] Accounts Payable, Accrued Expenses and Other Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Consolidated Funds [Member] Consolidated Funds [Member] Consolidated Funds [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Non-recourse Promissory Notes [Member] Nonrecourse Promissory Notes [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Moshe Barkat and MVF Holdings [Member] Moshe Barkat And Mvf Holdings [Member] Moshe Barkat and MVF Holdings [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Lease expiration period Lease Expiration Period Represents the operating lease expiration period. Rent expense Operating Leases, Rent Expense, Net Unfunded capital commitments Unfunded Capital Commitments It represents the amount of unfunded capital commitments. Proceeds from issuance of debt Proceeds from Issuance of Debt Present value of future cash flows expected to be paid Present Value Of Future Cash Flows Expected To Be Paid The amount represents the present value of future cash flows expected to be paid at inception. Contractual obligation Contractual Obligation Debt default Debt Instrument, Debt Default, Amount Damages sought Loss Contingency, Damages Sought, Value Settlement amount Litigation Settlement, Amount Principles of Consolidation Consolidation, Policy [Policy Text Block] Consolidated Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Seed Investments Seed Investments [Policy Text Block] Disclosure of accounting policy for seed investments through the application of the voting interest. Non-Consolidated Variable Interest Entities Non Consolidation Variable Interest Entity Policy [Policy Text Block] Disclosure of accounting policy for non consolidation to describe the significant judgments and assumptions made in determining whether a variable interest held by the entity requires the variable interest entity to be consolidated and (or) disclose information about its involvement with the variable interest entity. Use of Estimates Use of Estimates, Policy [Policy Text Block] Indemnification Guarantees, Indemnifications and Warranties Policies [Policy Text Block] Non-Controlling Interests Non Controlling Interests in Consolidated Subsidiaries [Policy Text Block] Disclosure of accounting policy for non controlling interests in consolidated funds and subsidiaries. Class A Earnings per Share Earnings Per Share, Policy [Policy Text Block] Investments Investment, Policy [Policy Text Block] Debt Issuance Costs Deferred Charges, Policy [Policy Text Block] Revenues Revenue Recognition, Policy [Policy Text Block] Performance Fee Compensation Performance Fee Compensation [Policy Text Block] Disclosure of accounting policy for performance fee compensation. Stock-based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Non Management [Member] Non Management [Member] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2016-09 [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Retained Earnings [Member] Retained Earnings [Member] Noncontrolling Interests [Member] Noncontrolling Interest [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Percent of voting power in Medley LLC Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Parent ownership percentage of LLC Noncontrolling Interest, Ownership Percentage by Parent Noncontrolling interest ownership percentage of LLC Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Number of majority owned subsidiaries Number Of Majority Owned Subsidiaries Number Of Majority Owned Subsidiaries Total assets of consolidated variable interest entity Variable Interest Entity, Consolidated, Carrying Amount, Assets Total liabilities of consolidated variable interest entity Variable Interest Entity, Consolidated, Carrying Amount, Liabilities Fair value of investments in non-consolidated VIEs Variable Interest Entity, Nonconsolidated, Carrying Amount, Investments Variable Interest Entity, Nonconsolidated, Carrying Amount, Investments Receivables included as a component of other assets and clawback obligation Variable Interest Entity, Nonconsolidated, Carrying Amount, Receivables Variable Interest Entity, Nonconsolidated, Carrying Amount, Receivables Accrued clawback obligations Accrued Clawback Obligations Accrued Clawback Obligations Maximum loss exposure Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Reversal of performance fee Reversal Of Performance Fee Amount of performance fees reversed by the entity. Cumulative performance fees Cumulative Recognized Performance Fees Amount of revenue earned through the balance sheet date by the entity based on the investment results achieved. Cumulative effect of accounting change due to the adoption of ASU 2016-09 Cumulative Effect of New Accounting Principle in Period of Adoption Deferred tax asset Deferred Income Tax Assets, Net Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Investments Investment Holdings, Schedule of Investments [Text Block] Compensation and Retirement Disclosure [Abstract] Schedule of Nonvested RSU Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Remaining in 2017 Operating Leases, Future Minimum Payments, Remainder of Fiscal Year 2018 Operating Leases, Future Minimum Payments, Due in Two Years 2019 Operating Leases, Future Minimum Payments, Due in Three Years 2020 Operating Leases, Future Minimum Payments, Due in Four Years 2021 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total future minimum lease payments Operating Leases, Future Minimum Payments Due Schedule of Investments [Table] Schedule of Investments [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] CK Pearl Fund [Member] CK Pearl Fund [Member] CK Pearl Fund [Member] Redeemable Non Controlling Interest [Member] Redeemable Non Controlling Interest [Member] Redeemable Non-controlling Interest [Member] AOCI Attributable to Noncontrolling Interest [Member] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Loss from other than temporary impairment equity investments Equity Method Investment, Other than Temporary Impairment Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Available for sale impairment Other than Temporary Impairment Losses, Investments, Available-for-sale Securities Statement of Financial Position [Abstract] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Redeemable Noncontrolling Interest, by Legal Entity [Table] Redeemable Noncontrolling Interest, by Legal Entity [Table] SIC [Member] Medley and ''Investors'' [Member] Medley And Investors [Member] Medley and ''Investors'' [Member] DB MED INVESTOR I And II LLC [Member] Db Med Investor I And Ii Llc [Member] DB MED INVESTOR I And II LLC [Member] Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Master Investment Agreement with DB MED Investor I LLC and DB MED Investor II LLC [Member] Master Investment Agreement With Db Med Investor I Llc And Db Med Investor Ii Llc [Member] a Master Investment Agreement with DB MED Investor I LLC and DB MED Investor II LLC [Member] Redeemable Noncontrolling Interest [Line Items] Redeemable Noncontrolling Interest [Line Items] Fair value of non-controlling interest Redeemable Noncontrolling Interest, Equity, Fair Value Net income allocated to non-controlling interest Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Distributions to members and redeemable non-controlling interests Payments of Capital Distribution Balance of redeemable non-controlling interest Redeemable Noncontrolling Interest, Equity, Carrying Amount Investments and contributions Other Commitment Percent of preferred distributions given to Investors Preferred Stock, Dividend Rate, Percentage Percent of Joint Venture profits given to Investors Preferred Stock, Percentage of Joint Venture Profits Preferred Stock, Percentage of Joint Venture Profits Period before Investors can redeem their interests Redeemable Noncontrolling Interest, Period Before Given the Right of Redemption Redeemable Noncontrolling Interest, Period Before Given the Right of Redemption Contributions to the joint venture Partners' Capital Account, Contributions Purchases of available for sale securities Payments to Acquire Available-for-sale Securities Comprehensive income, attributable to noncontrolling interest Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Remaining contributions included in restricted cash Remaining Contributions Remaining Contributions Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Senior Notes [Member] Senior Notes [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Senior Notes Due 2026 [Member] Senior Notes Due 2026 [Member] Senior Notes Due 2026 [Member] Senior Notes Due 2024 [Member] Senior Notes Due 2024 [Member] Senior Notes Due 2024 [Member] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] On or after August 15, 2019 [Member] Debt Instrument, Redemption, Period One [Member] On or after January 30, 2020 [Member] Debt Instrument, Redemption, Period Two [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Debt instrument, face amount Debt Instrument, Face Amount Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Redemption percentage Debt Instrument, Redemption Price, Percentage Discount and direct issuance costs Deferred Finance Costs, Net Notes payable, fair value disclosure Notes Payable, Fair Value Disclosure Interest expense, including amortization of discount and debt issuance costs Interest and Debt Expense Interest expense Interest Expense, Debt Composition of Investments Investment [Table Text Block] Schedule of Debt Schedule of Debt [Table Text Block] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Participating Securities [Member] Participating Securities [Member] Participating Securities [Member]. Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Numerator Numerator [Abstract] Net income attributable to Medley Management Inc. Less: Allocation to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Net income (loss) available to Class A common stockholders Undistributed Earnings, Basic Denominator Denominator [Abstract] Weighted average shares of Class A common stock outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Net income (loss) per Class A share (in dollars per share) Earnings Per Share, Basic and Diluted Senior Unsecured Debt Document And Entity Information [Abstract] Document Information [Table] Document Information [Table] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Trading Symbol Trading Symbol Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Accrued compensation and benefits Employee-related Liabilities Due to affiliates Due to Affiliate Revenue share payable Revenue Share Payable Represents the obligation to pay a fixed percentage of management and incentive fees received to specific parties. Accrued interest Interest Payable Professional fees Accrued Professional Fees Deferred rent Deferred Rent Credit Deferred tax liabilities Deferred Tax Liabilities, Gross Performance fee compensation Performance Fee Compensation Payable Amount of payable, as of the balance sheet date, related to performance fees. Accounts payable and other accrued expenses Accrued Liabilities Total accounts payable, accrued expenses and other liabilities Accounts Payable and Other Accrued Liabilities Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Statement of Comprehensive Income [Abstract] Net income Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in fair value of available-for-sale securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to Medley Management Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Assets Assets [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash equivalents Restricted Cash Equivalents Restricted Cash Equivalents Investments, at fair value Management fees receivable Management Fees Receivable Carrying amount as of the balance sheet date of management fees earned but not received. Performance fees receivable Performance Fees Receivable Represents the amount as of the balance sheet date of performance fees receivable by the entity based on the investment results achieved. Other assets Other Assets Total assets Assets Liabilities and Equity Liabilities and Equity [Abstract] Senior unsecured debt Unsecured Debt Loans payable Long-term Debt Accounts payable, accrued expenses and other liabilities Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Redeemable Non-controlling Interests Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Common stock, value Common Stock, Value, Issued Additional paid in capital Additional Paid in Capital Accumulated deficit Retained Earnings (Accumulated Deficit) Total stockholders' deficit, Medley Management Inc. Stockholders' Equity Attributable to Parent Non-controlling interests Stockholders' Equity Attributable to Noncontrolling Interest Total deficit Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities, redeemable non-controlling interests and equity Liabilities and Equity Income Tax Disclosure [Abstract] Deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Effective tax rate Effective Income Tax Rate Reconciliation, Percent Income tax provision for discrete items associated with the forfeiture of RSUs Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount Interest expense and penalties Income Tax Examination, Penalties and Interest Expense Uncertain tax positions Liability for Uncertain Tax Positions, Noncurrent Schedule of Senior Unsecured Debt Components of Accounts Payable, Accrued Expenses, and Other Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Income Taxes Income Tax Disclosure [Text Block] Risks and Uncertainties [Abstract] Market and Other Risk Factors Concentration Risk Disclosure [Text Block] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Other Assets Other Assets Disclosure [Text Block] Fixed assets, net of accumulated depreciation of $2,053 and $1,816, respectively Property, Plant and Equipment, Net Security deposits Security Deposit Administrative fees receivable Due from affiliates Due from Affiliates Prepaid expenses and taxes Other Prepaid Expense, Current Other Other Receivables Total other assets Accumulated depreciation Property, Plant, and Equipment, Owned, Accumulated Depreciation 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 (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Stock-based compensation Share-based Compensation Amortization of debt issuance costs Amortization of Financing Costs Accretion of debt discount Accretion Expense Provision for (benefit from) deferred taxes Deferred Income Taxes and Tax Credits Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Net change in unrealized depreciation on investments Net Change In Unrealized AppreciationOrDepreciation On Investments The net change in unrealized appreciation on investments during the reporting period. Income from equity method investments Income (Loss) from Equity Method Investments Reclassification of cumulative dividends paid on forfeited restricted stock units Restricted Stock Award, Forfeitures, Dividends Other non-cash amounts Other Noncash Income (Expense) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Management fees receivable (Increase) Decrease in Management Fees Receivable The increase (decrease) during the reporting period in receivables arising from management fees. Performance fees receivable Increase (Decrease) in Performance Fees Receivable Increase (Decrease) in Performance Fees Receivable Other assets Increase (Decrease) in Other Operating Assets Accounts payable, accrued expenses and other liabilities Increase (Decrease) in Accounts Payable and Accrued 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] Purchases of fixed assets Payments to Acquire Property, Plant, and Equipment Distributions received from equity method investments Proceeds From Distributions, Equity Method Investments Proceeds From Distributions, Equity Method Investments Purchases of available-for-sale securities Net cash 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] Repayment of loans payable Repayments of Long-term Debt Proceeds from issuance of senior unsecured debt Proceeds from Issuance of Senior Long-term Debt Capital contributions from redeemable non-controlling interests Proceeds from Noncontrolling Interests Distributions to members and redeemable non-controlling interests Debt issuance costs Payments of Debt Issuance Costs Dividends paid Payments of Dividends Repurchases of Class A common stock Payments for Repurchase of Common Stock Capital contributions to equity method investments Contributions to Equity Method Investments Contributions to Equity Method Investments Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net increase (decrease) in cash, cash equivalents and restricted cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Cash, cash equivalents and restricted cash equivalents, beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Cash, cash equivalents and restricted cash equivalents, end of period Reconciliation of cash, cash equivalents, and restricted cash equivalents reported on the condensed consolidated balance sheets to the total of such amounts reported on the condensed consolidated statements of cash flows Cash and Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect [Abstract] Total cash, cash equivalents and restricted cash equivalents Supplemental cash flow information Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Deferred tax asset impact on cumulative effect of accounting change due to the adoption of ASU 2016-09 Fixed assets Capital Expenditures Incurred but Not yet Paid Reclassification of redeemable non-controlling interest Significant Noncash Transaction, Reclassification from Permanent to Temporary Equity Significant Noncash Transaction, Reclassification from Permanent to Temporary Equity Incentive fees Incentive Fee Expense Basic and Diluted Income per Class A Share Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block] Compensation Expense Compensation and Employee Benefit Plans [Text Block] Components of Other Assets Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Earnings (Loss) Per Class A Share Earnings Per Share [Text Block] Statement of Stockholders' Equity [Abstract] Common Stock [Member] Common Stock [Member] Accumulated Other Comprehensive Income [Member] AOCI Including Portion Attributable to Noncontrolling Interest [Member] Accumulated Deficit [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Balance (in shares) Shares, Outstanding Net income Net income (loss) Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Net income (loss) Change in fair value of available-for-sale securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Change in fair value of available-for-sale securities Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Dividends on Class A common stock ($0.20 per share) Dividends, Common Stock, Cash Reclass of cumulative dividends on forfeited RSUs Issuance of Class A common stock related to vesting of restricted stock units (shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Repurchases of Class A common stock Stock Repurchased During Period, Value Repurchase of Class A common stock (in shares) Stock Repurchased During Period, Shares Contributions Distributions Partners' Capital Account, Distributions Balance Balance (in shares) Related Party Transactions Related Party Transactions Disclosure [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] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Chief Executive Officer [Member] Chief Executive Officer [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Maximum aggregate compensation Maximum Aggregate Compensation Maximum Aggregate Compensation Performance fee compensation Performance fee compensation payable Percentage vested from participants eligibility date Percentage Vested From Participants Eligibility Date Percentage vested from participants eligibility date. Contributions as a percent of employee eligible wages Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Accrued contributions Defined Contribution Plan, Employer Discretionary Contribution Amount Retirement plan liability Pension and Other Postretirement and Postemployment Benefit Plans, Liabilities Shares authorized for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Incentive Plan shares available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant RSU vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Stock-based compensation (less than in 2017) Reversal of previously recognized compensation Allocated Share-based Compensation Expense Unvested RSU compensation cost not yet recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Recognition period for unvested RSU compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Credit Suisse Term Loan Facility [Member] Credit Suisse Term Loan Facility [Member] Non Recourse Promissory Notes Due March 2019 [Member] Non Recourse Promissory Notes Due March2019 [Member] Non Recourse Promissory Notes Due March 2019 [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) [Member] London Interbank Offered Rate (LIBOR) [Member] Federal Funds Effective Swap Rate [Member] Federal Funds Effective Swap Rate [Member] Eurodollar [Member] Eurodollar [Member] Base Rate [Member] Base Rate [Member] Alternate Base Rate [Member] Alternate Base Rate [Member] Alternate Base Rate [Member]. 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