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Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Number of RSUs Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Shares redeemed (in shares) Stock Redeemed or Called During Period, Shares Sale of non-controlling interests Noncontrolling Interest, Increase from Sale of Parent Equity Interest Additional Paid-in Capital Additional Paid-in Capital [Member] Aggregate purchase price and fair values of assets acquired and liabilities assumed Schedule of Business Acquisitions, by Acquisition [Table Text Block] Partner Type [Axis] Partner Type [Axis] Other assets and receivables Other Assets Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total StepStone Group Inc. partners' capital Capital account interest Partners' Capital Revenue from Contract with Customer [Abstract] 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Accumulated Other Comprehensive Income (Loss) Accumulated other comprehensive income AOCI Attributable to Parent [Member] 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Four Underwriters' option Over-Allotment Option [Member] Operating leases, rent expense Operating Leases, Rent Expense Finite-lived intangible assets—contractual rights Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Unrealized loss on defined benefit plan, net Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Additions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Use of Estimates Use of Estimates, Policy [Policy Text Block] Thereafter Lessee, Operating And Finance Lease, Liability, To Be Paid, After Year Five Lessee, Operating And 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Comprehensive Income (Loss), Net of Tax, Attributable to Parent Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Reconciliation of the U.S. federal statutory income tax rate to the effective tax rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Effect of Reorganization and purchase of units in the Partnership Stockholders' Equity, Effect Of Reorganization Stockholders' Equity, Effect Of Reorganization Separately Managed Account Concentration Risk Separately Managed Account Concentration Risk [Member] Separately Managed Account Concentration Risk Scenario [Domain] Scenario [Domain] Legal Entity [Axis] Legal Entity [Axis] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment City Area Code City Area Code Document Period End Date Document Period End Date Contingent consideration obligation Business Combination, Contingent Consideration, Liability Intangibles and Goodwill Goodwill and Intangible Assets Disclosure [Text Block] Focused commingled funds Management And Advisory Fees, Net, Focused Commingled Funds [Member] Management And Advisory Fees, Net, Focused Commingled Funds Distributions Partners' Capital Account, Distributions Property, Plant and Equipment [Abstract] Investment income Income (Loss) from Equity Method Investments Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Accrued compensation and benefits Employee-related Liabilities Goodwill, impairment loss Goodwill, Impaired, Accumulated Impairment Loss Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Equity-based compensation Share-based Payment Arrangement, Noncash Expense Entity [Domain] Entity [Domain] Other financing activities Proceeds from (Payments for) Other Financing Activities Cover [Abstract] Measurement Input Type [Axis] Measurement Input Type [Axis] Computer equipment and software Computer Equipment And Software [Member] Computer Equipment And Software SMAs Incentive Fees, Separately Managed Accounts [Member] Incentive Fees, Separately Managed Accounts Amounts payable to StepStone Funds Equity Method Investee [Member] Income before income tax Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Property and equipment, estimated useful lives Property, Plant and Equipment, Useful Life Amounts payable to non-controlling interest holders in connection with Tax Receivable Agreements Affiliated Entity [Member] Debt obligations Long-term Debt Fair Value Disclosures [Abstract] Courtland Courtland Partners, Ltd. [Member] Courtland Partners, Ltd. 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Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Investments in funds Equity Method Investments, Excluding Accrued Carried Interest Allocations Equity Method Investments, Excluding Accrued Carried Interest Allocations Foreign Current Foreign Tax Expense (Benefit) Accounting for Differing Fiscal Periods Fiscal Period, Policy [Policy Text Block] Entity Registrant Name Entity Registrant Name Subsequent Event Type [Domain] Subsequent Event Type [Domain] Issued to Class B unitholders in the Reorganization / Class A partnership units exchanged in the Reorganization (in shares) Stockholders' Equity, Effect Of Reorganization, Shares Stockholders' Equity, Effect Of Reorganization, Shares Business Acquisition [Line Items] Business Acquisition [Line Items] Total deferred tax liabilities Deferred Tax Liabilities, Gross Number of reportable segments Number of Reportable Segments 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Nonoperating Income (Expense) [Abstract] Dividend (in dollars per share) Common Stock, Dividends, Per Share, Declared Total performance fee-related compensation Performance Fee-Related Compensation Related to Carried Interest Allocation Performance Fee-Related Compensation Related to Carried Interest Allocation Level II Fair Value, Inputs, Level 2 [Member] Business combination, contingent consideration, liability, measurement input Business Combination, Contingent Consideration, Liability, Measurement Input Vesting [Axis] Vesting [Axis] Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Equity [Abstract] Conversion of stock (in shares) Conversion of Stock, Shares Converted Accrued carried interest allocations Equity Method Investments, Accrued Carried Interest Allocations Equity Method Investments, Accrued Carried Interest Allocations Deferred offering costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Schedule of Antidilutive 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