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Fiscal Periods Fiscal Period, Policy [Policy Text Block] Principal payments on term loan Repayments of Long-term Debt Earnings per share of Class A common stock: Earnings Per Share [Abstract] StepStone Funds Equity Method Investee [Member] Related Party Transaction [Domain] Related Party Transaction [Domain] Document Quarterly Report Document Quarterly Report Other assets and receivables Increase (Decrease) in Other Operating Assets Total revenues Total revenues Revenues Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Expenses Costs and Expenses [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Equity-based compensation Share-based Payment Arrangement, Expense Deferred tax effect resulting from exchange of Class B units, net of amounts payable under Tax Receivable Agreements Adjustments To Additional Paid In Capital, Deferred Tax Effect Of Exchange Adjustments To Additional Paid In Capital, Deferred Tax Effect Of Exchange 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] Accounts payable, accrued expenses and other liabilities Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Noncontrolling interest, ownership by noncontrolling owners Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Weighted-Average Grant-Date Fair Value Per RSU Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Effective tax rate Effective Income Tax Rate Reconciliation, Percent Net income (loss) Net income (loss) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Class A Common Stock Common Class A [Member] Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Total cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Product Information [Line Items] Product Information [Line Items] United States UNITED STATES Shares sold in offering (in shares) Sale of Stock, Number of Shares Issued in Transaction Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Measurement Input, Discount Rate Measurement Input, Discount Rate [Member] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Other financing activities Proceeds from (Payments for) Other Financing Activities Management contracts Finite-Lived Intangible Assets, Gross Entity Central Index Key Entity Central Index Key Schedule of Intangible Assets, Net Schedule of Finite-Lived Intangible Assets [Table Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Security Exchange Name Security Exchange Name Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Diluted (in shares) Weighted-average shares of Class A common stock outstanding - Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Total other comprehensive income Other comprehensive income Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Class B2 units Class B2 Unit [Member] Class B2 Unit Fair Value, Recurring Fair Value, Recurring [Member] Lease right-of-use assets, net and lease liabilities Increase (Decrease) In Lease Right Of Use Assets, Net Of Lease Liabilities Increase (Decrease) In Lease Right Of Use Assets, Net Of Lease Liabilities Underwriters' option Over-Allotment Option [Member] Income Taxes Income Tax Disclosure [Text Block] Related Party [Domain] Related Party [Domain] Current Fiscal Year End Date Current Fiscal Year End Date Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Statement of Cash Flows [Abstract] Other income (expense) Nonoperating Income (Expense) [Abstract] Maximum exposure to loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Contributions to investments Payments to Acquire Equity Method Investments Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] 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 Consolidation Consolidation, Policy [Policy Text Block] Common stock, number of votes Common Stock, Number of Votes Common Stock, Number of Votes Class of Stock [Domain] Class of Stock [Domain] Cash consideration Payments to Acquire Businesses, Gross Partners’ Capital Limited Partner [Member] Carried interest allocation as percentage of cumulative fund or account performance Revenue, Carried Interest Allocation As Percentage Of Cumulative Fund Or Account Performance Revenue, Carried Interest Allocation As Percentage Of Cumulative Fund Or Account Performance Ownership [Domain] Ownership [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Number of partnership units acquired (in shares) Number Of Partnership Units Acquired Number Of Partnership Units Acquired Title of 12(b) Security Title of 12(b) Security Statement [Table] Statement [Table] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Unrecognized non-cash compensation Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Statistical Measurement [Axis] Statistical Measurement [Axis] Incremental income from assumed vesting and exchange of restricted share units and Class B units Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units Subsequent Event Subsequent Event [Member] Cover [Abstract] Intangibles, net Finite-Lived Intangible Assets, Net Goodwill Goodwill Non-controlling interests Less: Amounts attributable to non-controlling interests in subsidiaries Stockholders' Equity Attributable to Noncontrolling Interest Amortization of deferred financing costs Write off of Deferred Debt Issuance Cost Subsequent Event Type [Axis] Subsequent Event Type [Axis] Operating lease cost Operating Lease, Cost Related Party Transactions Related Party Transactions Disclosure [Text Block] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Occupancy expense Operating Leases, Rent Expense Unrealized loss on defined benefit plan, net Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]