Promissory note term Disposal Group, Including Discontinued Operation, Consideration, Secured Promissory Note, Term Disposal Group, Including Discontinued Operation, Consideration, Secured Promissory Note, Term Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Non-Controlling Interests in Legacy Greenspring Entities Legacy Entities [Member] Legacy Entities Contingent consideration obligations Business Combination, Contingent Consideration, Liability [Member] Business Combination, Contingent Consideration, Liability Award Type [Domain] Award Type [Domain] Fair Value as of Grant Date Award Grant Date Fair Value Investment, Name [Domain] Investment, Name [Domain] Interest rate in effect Line of Credit Facility, Interest Rate at Period End Cash consideration Payments to Acquire Businesses, Gross Total compensation and benefits Compensation And Benefits Expense Compensation And Benefits Expense 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] AUD Screen Rate Multiplied By Statutory Reserve Rate AUD Screen Rate Multiplied By Statutory Reserve Rate [Member] AUD Screen Rate Multiplied By Statutory Reserve Rate Balance, beginning of period: Balance, end of period: Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Unrealized Unrealized performance fee-related compensation Performance Fee-Related Compensation Related to Carried Interest Allocation, Unrealized Performance Fee-Related Compensation Related to Carried Interest Allocation, Unrealized Insider Trading Policies and Procedures [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] FY2029 Lessee, Operating Lease, Liability, to be Paid, Year Five Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Stockholders' Equity and Redeemable Interests Equity [Text Block] Exchange Two Exchange Two [Member] Exchange Two Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Ownership [Axis] Ownership [Axis] Number of classes of common stock outstanding Number Of Classes Of Common Stock Outstanding Number Of Classes Of Common Stock Outstanding Federal Deferred Federal Income Tax Expense (Benefit) Goodwill, impairment loss Goodwill, Impaired, Accumulated Impairment Loss Subsequent Event Type [Domain] Subsequent Event Type [Domain] Dividends paid to common stockholders Payments of Ordinary Dividends, Common Stock Property and equipment impairment Impairment, Long-Lived Asset, Held-for-Use Diluted (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Diluted Net unrealized gains on investments Unrealized Gain (Loss) on Investments Class B Partnership Unit Class B Partnership Unit [Member] Class B Partnership Unit Credit Agreement Line of Credit [Member] Redeemable non-controlling interests in Consolidated Funds Beginning balance Ending balance Redeemable Noncontrolling Interest, Equity, Carrying Amount Trading Symbol Trading Symbol Letters of credit outstanding Letters of Credit Outstanding, Amount Contributions to investments Payments to Acquire Equity Method Investments Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five Fair Value Disclosures [Abstract] Accounting Standards Update and Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] SMAs Carried Interest Allocation, Separately Managed Accounts [Member] Carried Interest Allocation, Separately Managed Accounts Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Deferred revenue Contract with Customer, Liability Schedule of Reconciliations of Basic and Diluted Earnings Per Share of Class A Common Stock Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Executive Category: Executive Category [Axis] Dividends [Domain] Dividends [Domain] Number of RSUs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Level I Fair Value, Inputs, Level 1 [Member] Total net deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Advisory and other services Management And Advisory Fees, Net, Advisory And Other Services [Member] Management And Advisory Fees, Net, Advisory And Other Services Property and equipment Property, Plant and Equipment [Table Text Block] Equity Components [Axis] Equity Components [Axis] Vesting of RSUs, net of shares withheld for employee taxes Stock Issued During Period, Value, Restricted Stock Award, Net of Shares Withheld For Employee Taxes Stock Issued During Period, Value, Restricted Stock Award, Net of Shares Withheld For Employee Taxes Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Number of shares available for grant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Investment Type [Axis] Investment Type [Axis] Non-Controlling Interests in the Partnership Partnership Of Subsidiary [Member] Partnership Of Subsidiary Swiss Average Rate Overnight Swiss Average Rate Overnight [Member] Swiss Average Rate Overnight Investments of consolidated funds, cost Investments Of Consolidated Funds, Cost Investments Of Consolidated Funds, Cost Entity Small Business Entity Small Business 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Four Investments [Domain] Investments [Domain] Accrued compensation and benefits Employee-related Liabilities Local Phone Number Local Phone Number Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Letters of credit Letter of Credit [Member] Realized Performance Fee-Related Compensation Related to Carried Interest Allocation, Realized Performance Fee-Related Compensation Related to Carried Interest Allocation, Realized Measurement Frequency [Axis] Measurement Frequency [Axis] Valuation Allowance [Roll Forward] Valuation Allowance [Roll Forward] Valuation Allowance Carried interest, contingent repayment obligations Equity Method Investment, Carried Interest Allocations, Maximum Amount Subject To Contingent Repayment Equity Method Investment, Carried Interest Allocations, Maximum Amount Subject To Contingent Repayment Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Stepstone Funds Equity Method Investee [Member] Depreciation Depreciation Legacy carried interest allocation as percentage of cumulative fund or account performance Revenue, Legacy Carried Interest Allocation As Percentage Of Cumulative Fund Or Account Performance Revenue, Legacy Carried Interest Allocation As Percentage Of Cumulative Fund Or Account Performance Retirement Benefits [Abstract] Variable Interest Entity, Not Primary Beneficiary, Subsidiaries Variable Interest Entity, Not Primary Beneficiary, Subsidiaries [Member] Variable Interest Entity, Not Primary Beneficiary, Subsidiaries SMAs Management And Advisory Fees, Net, Separately Managed Accounts [Member] Management And Advisory Fees, Net, Separately Managed Accounts Equity method investments Equity Method Investments [Table Text Block] Aggregate Purchase Price and Estimated Fair Values of Assets Acquired and Liabilities Assumed Schedule of Business Acquisitions, by Acquisition [Table Text Block] Total revenues Revenues Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable, accrued expenses and other liabilities Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Greenspring Bank Office Solutions, LLC (GBOS) Greenspring Bank Office Solutions, LLC (GBOS) [Member] Greenspring Bank Office Solutions, LLC (GBOS) Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Legacy Greenspring investments in funds and accrued carried interest allocations Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Legacy Investments In Funds And Accrued Carried Interest Allocations Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Legacy Investments In Funds And Accrued Carried Interest Allocations Acquisition-related costs Business Combination, Acquisition Related Costs Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Award Type [Axis] Award Type [Axis] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Non-cash operating, investing, and financing activities: Noncash Investing and Financing Items [Abstract] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Property and equipment, gross Property, Plant and Equipment, Gross Establishment of lease liabilities in exchange for lease right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Schedule of Dividends Dividends Declared [Table Text Block] Related Party Transactions Related Party Transactions Disclosure [Text Block] Less: Imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Components of provision for income taxes Schedule of Components of Income Tax Expense (Benefit) [Table 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] Legacy Greenspring Carried Interest Allocations Legacy Carried Interest Allocation [Member] Legacy Carried Interest Allocation Earn-out (up to) Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High New York Federal Reserve Bank Rate New York Federal Reserve Bank Rate [Member] New York Federal Reserve Bank Rate FY2027 Lessee, Operating Lease, Liability, to be Paid, Year Three Amounts paid to settle liability classified awards Share-Based Payment Arrangement, Cash Used to Settle Award Intangible assets, net Finite-Lived Intangible Assets, Net Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Due to related parties, tax receivable agreements Due To Related Parties, Tax Receivable Agreements Due To Related Parties, Tax Receivable Agreements Counterparty Name [Domain] Counterparty Name [Domain] Less: Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization FY2026 Lessee, Operating Lease, Liability, to be Paid, Year Two Equity method investments Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] Income before income tax Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Interest income Investment Income, Interest Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Foreign income before income tax Income (Loss) from Continuing Operations before Income Taxes, Foreign SMAs Legacy Carried Interest Allocation, Separately Managed Accounts [Member] Legacy Carried Interest Allocation, Separately Managed Accounts Total purchase price Business Combination, Consideration Transferred Security Exchange Name Security Exchange Name Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Vesting percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Employee Stock Option Employee Stock Option [Member] Investments Investment, Policy [Policy Text Block] Total expenses Expenses Costs and Expenses Maximum Maximum [Member] Unrecognized non-cash compensation Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Type Document Type Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Shares exchanged (in shares) Stockholders' Equity, Share Exchange, Shares Exchanged Stockholders' Equity, Share Exchange, Shares Exchanged Tabular List, Table Tabular List [Table Text Block] Maximum exposure to loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Investments of consolidated funds, percent of total investments Investments of Consolidated Funds, Percent Of Total Investments Investments of Consolidated Funds, Percent Of Total Investments Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Equity-Based Compensation Share-Based Payment Arrangement [Text Block] Federal Current Federal Tax Expense (Benefit) Shares issued (in shares) Stockholders' Equity, Share Exchange, Shares Issued Stockholders' Equity, Share Exchange, Shares Issued Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Other non-cash activities Other Noncash Income (Expense) Acquisition date fair value of consideration transferred: Business Combination, Consideration Transferred [Abstract] Class Of Partnership Unit [Axis] Class Of Partnership Unit [Axis] Class Of Partnership Unit Unrealized investment income of Consolidated Funds Unrealized Investment Gain (Loss) From Consolidated Funds Unrealized Investment Gain (Loss) From Consolidated Funds Business Acquisition [Axis] Business Acquisition [Axis] Excluding Consolidated Funds Excluding Consolidated Funds [Member] Excluding Consolidated Funds Changes in fair value hierarchy levels Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net State and local Deferred State and Local Income Tax Expense (Benefit) Variable Rate [Axis] Variable Rate [Axis] Expenses Costs and Expenses [Abstract] Investment income Net Investment Income Title of 12(b) Security Title of 12(b) Security Sublease income Sublease Income Related Party [Domain] Related Party, Type [Domain] Business Combinations Business Combination Disclosure [Text Block] Distributions to non-controlling interests Payments of Ordinary Dividends, Noncontrolling Interest Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Beginning balance (in dollars per share) Ending balance (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 Income Tax Disclosure [Abstract] Purchase of non-controlling interests Payments to Noncontrolling Interests Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-Based Payment Arrangement [Abstract] Less: Comprehensive income attributable to redeemable non-controlling interests Comprehensive Income (Loss), Net Of Tax, Redeemable Noncontrolling Interest Comprehensive Income (Loss), Net Of Tax, Redeemable Noncontrolling Interest Contractual rights: service agreements Contractual Rights, Service Agreements [Member] Contractual Rights, Service Agreements Entity Tax Identification Number Entity Tax Identification Number Deferred tax effect resulting from transactions affecting ownership in the Partnership, including net amounts payable under Tax Receivable Agreements Deferred Tax Effect From Exchange Of Units, Net Deferred Tax Effect From Exchange Of Units, Net Total lease cost Lease, Cost Statistical Measurement [Axis] Statistical Measurement [Axis] Non-Controlling Interests Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Entity Interactive Data Current Entity Interactive Data Current Total Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Amounts receivable from loans Other Receivables, Loans [Member] Other Receivables, Loans 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] Intangibles and Goodwill Goodwill and Intangible Assets, Policy [Policy Text Block] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Focused commingled funds Carried Interest Allocation, Focused Commingled Funds [Member] Carried Interest Allocation, Focused Commingled Funds Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Partnership StepStone Group LP [Member] StepStone Group LP Lease right-of-use assets, net Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Lease Right Of Use Assets, Net Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Lease Right Of Use Assets, Net Measure: Measure [Axis] Commitments and Contingencies Disclosure [Abstract] Name Outstanding Recovery, Individual Name Legacy carried interest allocation, focused comingled funds Legacy Carried Interest Allocation, Focused Commingled Funds [Member] Legacy Carried Interest Allocation, Focused Commingled Funds Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Estimated fair value of assets acquired and liabilities assumed: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Components of deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Counterparty Name [Axis] Counterparty Name [Axis] Noncontrolling Interest in Consolidated Funds Noncontrolling Interest In Consolidated Funds [Member] Noncontrolling Interest In Consolidated Funds Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] LTIP 2020 Long-Term Incentive Plan [Member] 2020 Long-Term Incentive Plan 2025 Finite-Lived Intangible Asset, Expected Amortization, Year One Operating cash flows used for operating leases Operating Lease, Payments Common stock, shares outstanding (in shares) Common stock, shares outstanding, beginning balance (in shares) Common stock, shares outstanding, ending balance (in shares) Common Stock, Shares, Outstanding Amounts payable to non-controlling interest holders in connection with Tax Receivable Agreements Other Liabilities, Non-Controlling Interest Holders due to Tax Receivable Agreements [Member] Other Liabilities, Non-Controlling Interest Holders due to Tax Receivable Agreements PEO PEO [Member] Subsidiary of Limited Liability Company or Limited Partnership [Line Items] Subsidiary of Limited Liability Company or Limited Partnership [Line Items] Concentrations of Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Auditor Location Auditor Location Employee Benefits Retirement Benefits [Text Block] Lease liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Lease Liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Lease Liabilities Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Changes in operating assets and liabilities of Consolidated Funds: Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Operating Activities, Consolidated Funds [Abstract] Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Operating Activities, Consolidated Funds Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Sale of Stock [Axis] Sale of Stock [Axis] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Focused commingled funds(1) Management And Advisory Fees, Net, Focused Commingled Funds [Member] Management And Advisory Fees, Net, Focused Commingled Funds Less: Comprehensive income attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Nonredeemable Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Nonredeemable Noncontrolling Interest Revenue since acquisition date Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Measurement Input Type [Domain] Measurement Input Type [Domain] Credit Facility [Axis] Credit Facility [Axis] Total liabilities Liabilities Liabilities Total current income tax expense Current Income Tax Expense (Benefit) Service agreement intangibles Gain (Loss) on Disposition of Intangible Assets Measurement Frequency [Domain] Measurement Frequency [Domain] Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Payments on revolving credit facility Repayments of Long-Term Lines of Credit Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Legacy Greenspring investments in funds Legacy Investments In Funds Legacy Investments In Funds Related Party Transaction [Domain] Related Party Transaction [Domain] Computer equipment and software Computer Equipment And Software [Member] Computer Equipment And Software Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Affiliated Entity Affiliated Entity [Member] General, administrative and other General and Administrative Expense Adjustments to reconcile net income (loss) to net cash provided by operating activities of Consolidated Funds: Adjustments To Reconcile Net Income (Loss) To Net Cash Provided By Operating Activities Of Consolidated Funds [Abstract] Adjustments To Reconcile Net Income (Loss) To Net Cash Provided By Operating Activities Of Consolidated Funds Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] State and local Current State and Local Tax Expense (Benefit) Amounts payable to StepStone Funds Other Liabilities, StepStone Funds [Member] Other Liabilities, StepStone Funds Segments Segment Reporting, Policy [Policy Text Block] Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Schedule of Fair Value of Liabilities and Assets Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Contingent consideration obligations Business Combination, Contingent Consideration, Liability Equity securities Equity Securities [Member] Sterling Overnight Index Average Sterling Overnight Index Average [Member] Sterling Overnight Index Average Supplemental disclosures: Supplemental Cash Flow Information [Abstract] Other liabilities Other Liabilities Intangibles and Goodwill Goodwill and Intangible Assets Disclosure [Text Block] Equity method investment, total accrued carried interest allocation percentage Concentration Risk, Percentage Balance, beginning of period: Balance, end of period: Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] State and local income tax Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Investments, at fair value Investments Weighted-average grant-date fair value of awards granted (in dollars per share) 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 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Five Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fees and Accounts Receivable Accounts Receivable [Policy Text Block] Investments in funds Equity Method Investments, Excluding Accrued Carried Interest Allocations Equity Method Investments, Excluding Accrued Carried Interest Allocations Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Schedule of Future Amortization of Finite-lived Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Class of Stock [Axis] Class of Stock [Axis] Entities [Table] Entities [Table] Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Legacy Greenspring accrued carried interest-related compensation Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Legacy Carried Interest Related Compensation Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Legacy Carried Interest Related Compensation Percentage of equity interest sold Disposal Group, Including Discontinued Operation, Percentage Of Equity Interest Sold Disposal Group, Including Discontinued Operation, Percentage Of Equity Interest Sold Depreciation and amortization Depreciation, Depletion and Amortization Office furniture Furniture and Fixtures [Member] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Entity Information [Line Items] Entity Information [Line Items] Business Combination and Asset Acquisition [Abstract] Impairment of goodwill Goodwill, Impairment Loss Investment in the Partnership Deferred Tax Assets, Investments Valuation allowance Deferred tax assets, valuation allowance Beginning balance Ending balance Deferred Tax Assets, Valuation Allowance Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Deferred revenue, revenue recognized Contract with Customer, Liability, Revenue Recognized Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Deferred income taxes Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Net income (loss) per share of Class A common stock: Earnings Per Share Reconciliation [Abstract] Base interest rate Debt Instrument, Base Interest Rate Debt Instrument, Base Interest Rate Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Preferred stock, issued (in shares) Preferred Stock, Shares Issued Entity Emerging Growth Company Entity Emerging Growth Company Less: Debt issuance costs Debt Issuance Costs, Net Intangibles, net Intangible Assets, Net (Excluding Goodwill) Total deferred tax assets before valuation allowance Deferred Tax Assets, Gross Total performance fee-related compensation Performance Fee-Related Compensation Related to Carried Interest Allocation Performance Fee-Related Compensation Related to Carried Interest Allocation Finite-lived intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles FY2025 Lessee, Operating Lease, Liability, to be Paid, Year One Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Legacy Greenspring accrued carried interest allocations Legacy Accrued Carried Interest Allocations Legacy Accrued Carried Interest Allocations Title Trading Arrangement, Individual Title Total equity method income (loss) Revenue Not From Contract With Customer, Income Loss From Equity Method Investments And Investment Income Revenue Not From Contract With Customer, Income Loss From Equity Method Investments And Investment Income Common Stock Common Stock [Member] Unrealized gain (loss) on defined benefit plan, net Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Individual: Individual [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Schedule of Changes in the Fair Value of Level III Financial Instruments Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Total stockholders’ equity Total stockholders' equity, beginning balance Total stockholders' equity, ending balance Equity Equity, Including Portion Attributable to Noncontrolling Interest Distributions Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Accounts payable, accrued expenses and other liabilities Accounts Payable and Other Accrued Liabilities Investments: Investments [Abstract] Minimum Minimum [Member] Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Property and equipment, net Property, Plant and Equipment, Net Dividend per share of Class A common stock (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Common Class B Member, Issuable In Connection With Vesting Of Class B2 Units Common Class B Member, Issuable In Connection With Vesting Of Class B2 Units [Member] Common Class B Member, Issuable In Connection With Vesting Of Class B2 Units Total other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Disposal Group Classification [Axis] Disposal Group Classification [Axis] Statement of Cash Flows [Abstract] Assets Assets [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Foreign currency translation gains (losses) Gain (Loss), Foreign Currency Transaction, before Tax Schedule of Subsidiary of Limited Liability Company or Limited Partnership [Table] Schedule of Subsidiary of Limited Liability Company or Limited Partnership [Table] Payments for employee taxes related to net settlement of RSUs Payment, Tax Withholding, Share-Based Payment Arrangement Deferred tax assets: Deferred Tax Assets, Net [Abstract] Other Deferred Tax Assets, Other Changes in unrealized losses included in earnings related to financial liabilities still held at the reporting date Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Deferred income tax assets Deferred Income Tax Assets, Net Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Other investing activities Payments for (Proceeds from) Other Investing Activities Ownership percentage acquired Business Acquisition, Percentage of Voting Interests Acquired Current Events Current Events, Policy [Policy Text Block] Current Events, Policy Retained Earnings Retained Earnings [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Other income (expense) Nonoperating Income (Expense) [Abstract] Changes in fair value hierarchy levels Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic Accounting Policies [Abstract] Sale of Stock [Domain] Sale of Stock [Domain] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Plan assets Defined Benefit Plan, Plan Assets, Amount Net deferred tax assets Deferred Tax Assets, Net Taxes paid Income Taxes Paid Consolidation Consolidation, Policy [Policy Text Block] Document Transition Report Document Transition Report Award Timing Predetermined Award Timing Predetermined [Flag] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Entity Public Float Entity Public Float Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Secured Overnight Financing Rate (SOFR) 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] Tax Receivable Agreements Tax Receivable Agreement, Policy [Policy Text Block] Tax Receivable Agreement, Policy Property, Plant and Equipment [Abstract] Increase in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Revolver Long-Term Debt, Gross Liability Class [Axis] Liability Class [Axis] All Trading Arrangements All Trading Arrangements [Member] Membership ownership percentage Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Loss on sale of subsidiary Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal All Adjustments to Compensation All Adjustments to Compensation [Member] Compensation Amount Outstanding Recovery Compensation Amount Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Consolidated Funds Consolidated Funds [Member] Consolidated Funds Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] 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 Vesting of RSUs Stock Issued During Period, Value, Restricted Stock Award, Gross Total deferred income tax expense (benefit) Deferred Income Tax Expense (Benefit) Subsequent Event Type [Axis] Subsequent Event Type [Axis] Statement of Comprehensive Income [Abstract] Increase in deferred tax assets due to remeasurement of non-controlling interest in subsidiaries Increase (Decrease) In Deferred Tax Assets, Remeasurement Of Non-Controlling Interest In Subsidiaries Increase (Decrease) In Deferred Tax Assets, Remeasurement Of Non-Controlling Interest In Subsidiaries Document Financial Statement Error Correction Document Financial Statement Error Correction [Flag] Stock issued for acquisition (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Forfeited (in shares) Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Distributions received from investments Proceeds from Equity Method Investment, Distribution, Return of Capital Income passed through to limited partners Effective Income Tax Rate Reconciliation, Income Passed Through To Limited Partners, Percent Effective Income Tax Rate Reconciliation, Income Passed Through To Limited Partners, Percent Other assets and receivables Other Assets Assumed vesting and exchange of restricted share units and Class B2 units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Document Period End Date Document Period End Date Adoption Date Trading Arrangement Adoption Date Pro Forma Effect Business Acquisition, Pro Forma Information [Table Text Block] Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Income tax expense Income tax expense Total income tax expense Income Tax Expense (Benefit) Non-U.S. countries Non-US [Member] Deferred tax effect resulting from equity transactions affecting ownership in the Partnership Adjustments To Additional Paid In Capital, Deferred Tax Effect Of Exchange Adjustments To Additional Paid In Capital, Deferred Tax Effect Of Exchange Vested (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested Vesting [Axis] Vesting [Axis] Fair Value Measurements Fair Value Disclosures [Text Block] Number of operating segments Number of Operating Segments Equity [Abstract] Weighted-average remaining lease term for operating leases (in years) Operating Lease, Weighted Average Remaining Lease Term Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Redeemable Noncontrolling Interests Redeemable Noncontrolling Interest [Table Text Block] Partnership and LLC interests Partnerships and LLC Interests [Member] Partnerships and LLC Interests Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Cash paid for Greenspring acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Comprehensive income (loss) before non-controlling interests Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Equity method investments: Equity Method Investment, Financial Statement, Reported Amounts [Abstract] Credit Facility [Domain] Credit Facility [Domain] Spread on base commitment fee percentage if utilization less than 50% Line Of Credit Facility, Commitment Fee Percentage, Spread On Base If Utilization Less Than 50 Percent Line Of Credit Facility, Commitment Fee Percentage, Spread On Base If Utilization Less Than 50 Percent Basis spread on variable interest rate Debt Instrument, Basis Spread on Variable Rate Property and equipment, estimated useful lives Property, Plant and Equipment, Useful Life 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 Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Change in valuation allowance Summary of Valuation Allowance [Table Text Block] Variable Interest Entity, Not Primary Beneficiary, Legacy Entities Variable Interest Entity, Not Primary Beneficiary, Legacy Entities [Member] Variable Interest Entity, Not Primary Beneficiary, Legacy Entities Revenues Revenue from Contract with Customer [Text Block] 1 Month Term Secured Overnight Financing Rate (SOFR) 1 Month Term Secured Overnight Financing Rate (SOFR) [Member] 1 Month Term Secured Overnight Financing Rate (SOFR) Schedule of Consolidated Funds Consolidated Funds Investments [Table Text Block] Consolidated Funds Investments Additional Paid-in Capital Additional Paid-in Capital [Member] Document Annual Report Document Annual Report Investment income (loss) Income (Loss) from Equity Method Investments Common stock, number of votes Common Stock, Number of Votes Common Stock, Number of Votes Cover [Abstract] Subsequent Events Subsequent Events [Text Block] Amortization of deferred financing costs Amortization of Debt Issuance Costs United States UNITED STATES Fair Value, Recurring Fair Value, Recurring [Member] Total lease liabilities Lessee, Operating Lease, Liability, to be Paid Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Increase in due to related parties, tax receivable agreements Increase (Decrease) In Due To Related Parties, Tax Receivable Agreements Increase (Decrease) In Due To Related Parties, Tax Receivable Agreements Equity Component [Domain] Equity Component [Domain] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Entity Current Reporting Status Entity Current Reporting Status Concentration Risk Type [Domain] Concentration Risk Type [Domain] Initial consolidation of legacy Greenspring general partner entities Noncontrolling Interest, Increase from Business Combination Net realized gains on investments Realized Investment Gains (Losses) Transaction agreement, notification period Transaction Agreement, Notification Period Transaction Agreement, Notification Period Total deferred tax liabilities Deferred Tax Liabilities, Gross Consolidated Entities [Domain] Consolidated Entities [Domain] Increase in deferred tax assets due to exchange of partnership units for common stock Increase (Decrease) In Deferred Tax Assets, Exchange Of Partnership Units For Common Stock Increase (Decrease) In Deferred Tax Assets, Exchange Of Partnership Units For Common Stock Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Dividends [Axis] Dividends [Axis] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Client relationships Customer Relationships [Member] Stockholders’ equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Share-based Payment Arrangement, Tranche One Share-Based Payment Arrangement, Tranche One [Member] Change in deferred income taxes Deferred Income Taxes and Tax Credits Consolidated Entities [Axis] Consolidated Entities [Axis] Variable Rate [Domain] Variable Rate [Domain] Change in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Less: Net income attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Debt Instrument, Redemption [Line Items] Debt Instrument, Redemption [Line Items] Pay vs Performance Disclosure [Line Items] Entity Voluntary Filers Entity Voluntary Filers Statistical Measurement [Domain] Statistical Measurement [Domain] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Greenspring Greenspring [Member] Greenspring Unvested (in shares) RSUs, beginning balance (in shares) RSUs, ending balance (in shares) Unvested awards (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Debt Obligations Debt Disclosure [Text Block] Revolving credit facility Revolving Credit Facility [Member] Consolidated VIEs Variable Interest Entity, Primary Beneficiary [Member] Effect of foreign currency exchange rate changes Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Impairment charges, finite-lived intangible assets Impairment of Intangible Assets, Finite-Lived Equity Method Investments and Joint Ventures [Abstract] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Earnings since acquisition date Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Transfers out of Level III Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Restatement Determination Date: Restatement Determination Date [Axis] Investment, Name [Axis] Investment, Name [Axis] Total other income (expense) Nonoperating Income (Expense) Federal tax at statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Commitments and contingencies (Note 16) Commitments and Contingencies Class C Partnership units issued for Greenspring acquisition Partnership Units Issued For Acquisition Partnership Units Issued For Acquisition General Partner General Partner [Member] Geographical [Axis] Geographical [Axis] Income Taxes Income Tax Disclosure [Text Block] Leases Lessee, Leases [Policy Text Block] Revenues Revenue [Policy Text Block] Changes in unrealized losses included in earnings related to financial liabilities still held at the reporting date Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Income tax decrease Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Business Acquisition [Line Items] Business Acquisition [Line Items] 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] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Reclassification and adjustment of non-controlling interests in subsidiaries to redeemable equity at redemption value Reclassification and adjustment of non-controlling interests in subsidiaries to redeemable equity at redemption value Reclassification from permanent equity at redemption value Reclassifications Of Permanent Equity To Temporary Equity And Adjustment To Redemption Value Reclassifications Of Permanent Equity To Temporary Equity And Adjustment To Redemption Value PEO Total Compensation Amount PEO Total Compensation Amount Number of cities for leased offices Lessee, Operating Lease, Number Of Cities Lessee, Operating Lease, Number Of Cities Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] StepStone Funds StepStone Funds [Member] StepStone Funds Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Level III Fair Value, Inputs, Level 3 [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Due from affiliates Increase (Decrease) in Due from Related Parties Net income (loss) attributable to StepStone Group Inc. Net income (loss) attributable to StepStone Group Inc. – Basic Net Income (Loss) Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Company Selected Measure Name Company Selected Measure Name Due from Affiliates Related Party Transactions [Policy Text Block] Related Party Transactions Class C Partnership Unit Class C Partnership Unit [Member] Class C Partnership Unit Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Amounts receivable from StepStone Funds Other Receivables, StepStone Funds [Member] Other Receivables, StepStone Funds Domestic income (loss) before income tax Income (Loss) from Continuing Operations before Income Taxes, Domestic Revenue, carried interest allocation, minimum return levels required Revenue, Carried Interest Allocation, Minimum Return Levels Required Revenue, Carried Interest Allocation, Minimum Return Levels Required Number of additional annual exchanges Transaction Agreement, Number of Additional Annual Exchanges Transaction Agreement, Number of Additional Annual Exchanges Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Weighted-average amortization period Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Percentage of carried interest allocation revenue awarded to employees as part of the long-term incentive compensation plan Revenue, Carried Interest Allocation, Employee Compensation, Percentage Revenue Carried Interest Allocation, Awarded To Employees, Percentage Accumulated Other Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Legacy Greenspring performance fee-related compensation Legacy Performance Fee-Related Compensation Related to Carried Interest Allocation Legacy Performance Fee-Related Compensation Related to Carried Interest Allocation Class B Common Stock Class B common stock, $0.001 par value, 125,000,000 authorized; 45,030,959 and 46,420,141 issued and outstanding as of March 31, 2024 and 2023, respectively Class B Common Stock Common Class B [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Other Commitments [Table] Other Commitments [Table] Name Measure Name Name Forgone Recovery, Individual Name Typical maximum equity interest held per fund Equity Method Investment, Equity Interest Per Fund, Percentage, Maximum Equity Method Investment, Equity Interest Per Fund, Percentage, Maximum Goodwill Goodwill Goodwill Underlying Securities Award Underlying Securities Amount Fees and accounts receivable Increase (Decrease) in Accounts Receivable Realized Carried Interest Allocation, Realized [Member] Carried Interest Allocation, Realized Accrued expenses and other liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Expenses And Other Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Expenses And Other Non-Controlling Interests in Subsidiaries Subsidiaries [Member] Dividends declared per share of Class A common stock (in dollars per share) Common Stock, Dividends, Per Share, Declared Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Management And Advisory Fees, Net, BDC Income Based Incentive Fees Management And Advisory Fees, Net, BDC Income Based Incentive Fees [Member] Management And Advisory Fees, Net, BDC Income Based Incentive Fees Term Debt Instrument, Term Payment of deferred offering costs Payments of Stock Issuance Costs Performance Fees Performance Fees [Member] Performance Fees Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Compensation and benefits: Income Statement Compensation Expense Items [Abstract] Gain on remeasurement of lease liabilities Gain on remeasurement of lease liabilities Gain (Loss) On Remeasurement Of Lease Liabilities Gain (Loss) On Remeasurement Of Lease Liabilities Cash consideration, net of working capital adjustment Payments To Acquire Businesses, Net Of Working Capital Adjustment Payments To Acquire Businesses, Net Of Working Capital Adjustment Schedule of Maturities of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Cash paid for amounts included in the measurement of lease liabilities: Cash Paid For Amounts Included In The Measurement Of Lease Liabilities [Abstract] Cash Paid For Amounts Included In The Measurement Of Lease Liabilities Management and advisory fees, net Management And Advisory Fees, Net [Member] Management And Advisory Fees, Net Cash, Cash Equivalents and Restricted Cash Cash and Cash Equivalents, Policy [Policy Text Block] Deferred offering costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Amounts receivable from employees Other Receivables, Employees [Member] Other Receivables, Employees Product and Service [Domain] Product and Service [Domain] Other Performance Measure, Amount Other Performance Measure, Amount Components of Lease Expense and Supplemental Cash Flow Information Lease, Cost [Table Text Block] Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Schedule of Common Stock Outstanding [Roll Forward] Schedule of Common Stock Outstanding [Roll Forward] Schedule of Common Stock Outstanding Sale of non-controlling interests Noncontrolling Interest, Increase from Sale of Parent Equity Interest Plan Name [Domain] Plan Name [Domain] Unrealized carried interest allocations and investment (income) loss Carried Interest Allocation And Investment Income, Unrealized Gain (Loss) Carried Interest Allocation And Investment Income, Unrealized Gain (Loss) Interest expense Interest Expense Trading Arrangement: Trading Arrangement [Axis] Business combination, contingent consideration, liability, measurement input Business Combination, Contingent Consideration, Liability, Measurement Input Use of Estimates Use of Estimates, Policy [Policy Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity File Number Entity File Number Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Measurement Input, Discount Rate Measurement Input, Discount Rate [Member] Auditor Firm ID Auditor Firm ID Amortization of intangible assets Amortization of Intangible Assets Entity Shell Company Entity Shell Company Non-controlling interests in legacy Greenspring entities Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Restatement Determination Date Restatement Determination Date Temporary Equity [Line Items] Temporary Equity [Line Items] Total carried interest allocations Revenue Not from Contract with Customer Other liabilities and payables Increase (Decrease) in Other Operating Liabilities Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Schedule of Rollforward of the Company's Shares of Common Stock Outstanding Since IPO Schedule of Stock by Class [Table Text Block] 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 Asset Class [Axis] Asset Class [Axis] Distributions payable to certain employee equity holders of consolidated subsidiaries Other Liabilities, Distributions Payable [Member] Other Liabilities, Distributions Payable Variable lease cost Variable Lease, Cost Operating lease cost Operating Lease, Cost Common stock, shares issued (in shares) Common Stock, Shares, Issued Schedule of Unvested Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Total assets Assets, Fair Value Disclosure Debt obligations Debt obligations Long-Term Debt Foreign currency translation adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Dividends Payable [Line Items] Dividends Payable [Line Items] Class A Common Stock Class A common stock, $0.001 par value, 650,000,000 authorized; 65,614,902 and 62,834,791 issued and outstanding as of March 31, 2024 and 2023, respectively Class A Common Stock Common Class A [Member] Unrecognized non-cash compensation, period of recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Other financing activities Proceeds from (Payments for) Other Financing Activities Comprehensive income (loss) attributable to StepStone Group Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Legacy Greenspring investment income (loss) Legacy Investment Income Legacy Investment Income 2024 Q1 Supplemental Dividend S2024Q1 [Member] S2024Q1 Number of terminated employees Disposal Group, Including Discontinued Operation, Terminated, Number of Employees Disposal Group, Including Discontinued Operation, Terminated, Number of Employees Underfunded pension obligation Defined Benefit Plan, Funded (Unfunded) Status of Plan Stock/units issued for Greenspring acquisition Stock Issued During Period, Value, Acquisitions Entity Address, Address Line One Entity Address, Address Line One Subsequent Event [Table] Subsequent Event [Table] Due to affiliates Accounts Payable, Other Subsequent Event Subsequent Event [Member] Less: Net income attributable to redeemable non-controlling interests Net income Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Schedule of Intangible Assets, Net Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Equity Method Investments [Line Items] Income Statement Income Statement [Abstract] Unrealized Carried Interest Allocation, Unrealized [Member] Carried Interest Allocation, Unrealized Percentage of total net cash savings retained Incremental Net Cash Tax Savings Due To Exchanging Limited Partners, Benefit Retained, Percent Incremental Net Cash Tax Savings Due To Exchanging Limited Partners, Benefit Retained, Percent Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Purchases of investments of Consolidated Funds Payments To Acquire Consolidated Funds Payments To Acquire Consolidated Funds EURIBOR Rate Multiplied By Statutory Reserve Rate Euro Interbank Offer Rate Multiplied By Statutory Reserve Rate [Member] Euro Interbank Offer Rate Multiplied By Statutory Reserve Rate Net income attributable to StepStone Group Inc. Business Acquisition, Pro Forma Net Income (Loss) Proceeds from capital contributions Proceeds From Capital Contributions From Non-Controlling Interests Proceeds From Capital Contributions From Non-Controlling Interests Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Annual percentage of equity interests to be exchanged Stockholder's Equity, Transaction Agreement, Annual Portion Of Equity Interests To Be Exchanged Stockholder's Equity, Transaction Agreement, Annual Portion Of Equity Interests To Be Exchanged Dividends Payable [Table] Dividends Payable [Table] Partnership interests grant date fair value (in dollars) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value Total equity method investments Equity Method Investments Investments of Consolidated Funds Investments of consolidated funds Investments Of Consolidated Funds Investments Of Consolidated Funds Cash-based compensation Compensation Expense, Cash Based Compensation And Benefits Compensation Expense, Cash Based Compensation And Benefits Changes to uncertain tax positions Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Total Shareholder Return Amount Total Shareholder Return Amount Reconciliation of cash, cash equivalents and restricted cash: Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Foreign Deferred Foreign Income Tax Expense (Benefit) Management contracts Management Contracts [Member] Management Contracts Supplemental annual cash dividend (in dollars per share) Supplemental Dividends Payable, Amount Per Share Supplemental Dividends Payable, Amount Per Share Incentive fees as percentage of profits Revenue From Contract With Customer, Incentive Fees As Percentage Of Net Investment Income Revenue From Contract With Customer, Incentive Fees As Percentage Of Net Investment Income Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Retained earnings Retained Earnings (Accumulated Deficit) Class A common stock issued for vesting of RSUs (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Transfers into Level III Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Issuance of note related to sale of subsidiary Noncash or Part Noncash Divestiture, Amount of Consideration Received Unrealized investment income of Consolidated Funds Income (Loss) From Consolidated Funds Income (Loss) From Consolidated Funds Other Commitments [Line Items] Other Commitments [Line Items] Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Entity Address, State or Province Entity Address, State or Province Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Consolidated Entity, Excluding Consolidated VIE Consolidated Entity, Excluding Consolidated VIE [Member] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Liability classified awards Liability Classified Award [Member] Liability Classified Award Disposal Group Name [Domain] Disposal Group Name [Domain] Debt Instrument Redemption [Table] Debt Instrument Redemption [Table] Weighted-average shares of Class A common stock: Earnings Per Share, Basic [Abstract] Due from affiliates Other Receivables Contractual rights: management contracts Contractual Rights, Management Contracts [Member] Contractual Rights, Management Contracts Separately Managed Account Concentration Risk Separately Managed Account Concentration Risk [Member] Separately Managed Account Concentration Risk Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Asset Class [Domain] Asset Class [Domain] Equity increase Adjustments To Additional Paid In Capital, Increase In Deferred Tax Assets Valuation Allowance Adjustments To Additional Paid In Capital, Increase In Deferred Tax Assets Valuation Allowance Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Conversion of stock, conversion basis (in shares) Conversion Of Stock, Conversion Basis Conversion Of Stock, Conversion Basis Class of Stock [Domain] Class of Stock [Domain] Legacy Funds Legacy Funds [Member] Legacy Funds Effective tax rate Effective Income Tax Rate Reconciliation, Percent Lease liabilities Total operating lease liabilities Operating Lease, Liability Contributions Noncontrolling Interest, Increase from Subsidiary Equity Issuance Equity decrease Adjustments To Additional Paid In Capital, Decrease In Deferred Tax Assets Valuation Allowance Adjustments To Additional Paid In Capital, Decrease In Deferred Tax Assets Valuation Allowance Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Vesting [Domain] Vesting [Domain] Accumulated Other Comprehensive Income Accumulated other comprehensive income AOCI Attributable to Parent [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Non-discretionary contributions Defined Contribution Plan, Cost All Executive Categories All Executive Categories [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Statement of Partners' Capital [Abstract] Other assets and receivables Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Noncurrent Assets And Receivables Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Noncurrent Assets And Receivables Unrealized gain on defined benefit plan, net Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Plan Name [Axis] Plan Name [Axis] Debt Disclosure [Abstract] SMAs Incentive Fees, Separately Managed Accounts [Member] Incentive Fees, Separately Managed Accounts Tax benefits related to equity-based awards Share-Based Payment Arrangement, Expense, Tax Benefit Number of reportable segments Number of Reportable Segments Net income (loss) per share of Class A common stock: Earnings Per Share [Abstract] Cash and short-term receivables Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Cash And Receivables Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Cash And Receivables Schedule of Carrying Value of the Assets and Liabilities of the Company's Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Common stock Common Stock, Value, Issued Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Partnership and LLC interests Partnership and LLC Interests [Member] Partnership and LLC Interests Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Revenue from Contract with Customer [Abstract] Fees and accounts receivable Accounts Receivable, after Allowance for Credit Loss Restricted cash Restricted Cash All Individuals All Individuals [Member] Exchange One Exchange One [Member] Exchange One Other income (loss) Other Nonoperating Income (Expense) Entity Filer Category Entity Filer Category Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Incentive fees Incentive Fees Incentive Fees [Member] Incentive Fees Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Statement [Table] Statement [Table] Audit Information [Abstract] Audit Information Current Fiscal Year End Date Current Fiscal Year End Date 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] Unrecognized tax benefits Unrecognized Tax Benefits PEO Name PEO Name Schedule of Product Information [Table] Schedule of Product Information [Table] Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, outstanding (in shares) Preferred Stock, Shares Outstanding Contractual rights Contractual Rights [Member] Accrued compensation and benefits Increase (Decrease) in Employee Related Liabilities Financial Position Statement of Financial Position [Abstract] Investment in fund, before eliminations Investment In Fund, Before Eliminations Investment In Fund, Before Eliminations Remeasurement of lease liabilities Remeasurement Of Lease Liabilities Remeasurement Of Lease Liabilities Total StepStone Group Inc. stockholders’ equity Equity, Attributable to Parent Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Accrued dividends Dividends Incurred But Not Yet Paid Dividends Incurred But Not Yet Paid Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Outstanding (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Outstanding Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Outstanding Subsequent Events [Abstract] Total income (loss) before income tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Profits interests percent Share-Based Compensation Arrangement By Share-Based Payment Award, Profits Interest Share-Based Compensation Arrangement By Share-Based Payment Award, Profits Interest Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Level II Fair Value, Inputs, Level 2 [Member] Percentage of total net cash savings due to exchanging limited partners Incremental Net Cash Tax Savings Due To Exchanging Limited Partners, Percent Incremental Net Cash Tax Savings Due To Exchanging Limited Partners, Percent Fund reimbursement revenues Management And Advisory Fees, Net, Fund Reimbursement Revenues [Member] Management And Advisory Fees, Net, Fund Reimbursement Revenues Class A2 Interests Class A2 Interests [Member] Class A2 Interests Disposal Group Classification [Domain] Disposal Group Classification [Domain] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Dividends (in dollars per share) Dividends Payable, Amount Per Share Finite-lived intangible assets, estimated useful lives Finite-Lived Intangible Asset, Useful Life FY2028 Lessee, Operating Lease, Liability, to be Paid, Year Four Equity-based compensation Share-Based Payment Arrangement, Noncash Expense Accrued carried interest allocations Equity Method Investments, Accrued Carried Interest Allocations Equity Method Investments, Accrued Carried Interest Allocations Revenue from External Customers by Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] Unfunded capital commitments Off-Balance-Sheet, Credit Loss, Liability Two Investments Two Investments [Member] Two Investments City Area Code City Area Code Earnings Per Share Earnings Per Share [Text Block] Proceeds from sale of investments of Consolidated Funds Proceeds From Sale of Consolidated Funds Proceeds From Sale of Consolidated Funds Product and Service [Axis] Product and Service [Axis] Document Fiscal Year Focus Document Fiscal Year Focus Geographical [Domain] Geographical [Domain] Accrued carried interest-related compensation Equity Method Investment, Accrued Carried Interest Related Compensation Payable Equity Method Investment, Accrued Carried Interest Related Compensation Payable Compensation and Benefits Compensation Related Costs, Policy [Policy Text Block] Exercise Price Award Exercise Price Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Equity reallocation between controlling and non-controlling interests Adjustments To Additional Paid In Capital, Reallocation Of Noncontrolling Interest Adjustments To Additional Paid In Capital, Reallocation Of Noncontrolling Interest Dividends declared Dividends, Common Stock, Cash 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] Goodwill and Intangible Assets Disclosure [Abstract] Total liabilities Liabilities, Fair Value Disclosure Legacy Greenspring investments in funds and accrued carried interest allocations Legacy Investments In Funds And Accrued Carried Interest Allocations Legacy Investments In Funds And Accrued Carried Interest Allocations Shares available for issuance as consideration (in shares) Stockholder's Equity, Transaction Agreements, Shares Available For Issuance As Consideration Stockholder's Equity, Transaction Agreements, Shares Available For Issuance As Consideration Accounting for Differing Fiscal Periods Fiscal Period, Policy [Policy Text Block] Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Additions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Legacy gross carried interest allocation, focused comingled funds Legacy Gross Carried Interest Allocation, Focused Commingled Funds [Member] Legacy Gross Carried Interest Allocation, Focused Commingled Funds Total liabilities and stockholders’ equity Liabilities and Equity Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Ownership [Domain] Ownership [Domain] Lease right-of-use assets, net Operating Lease, Right-of-Use Asset Service agreements Service Agreements [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Foreign Current Foreign Tax Expense (Benefit) Performance fee-related compensation: Share-Based Payment Arrangement, Recognized Amount [Abstract] Net income (loss) attributable to StepStone Group Inc. – Diluted Net Income (Loss) Available to Common Stockholders, Diluted Arrangement Duration Trading Arrangement Duration Entity Address, City or Town Entity Address, City or Town Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Class C common stock Common Class C [Member] Purchase of non-controlling interests Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Termination Date Trading Arrangement Termination Date Common stock, shares authorized (in shares) Common Stock, Shares Authorized Economic ownership interest Economic Ownership Interest Economic Ownership Interest Consolidated Entities, Excluding Legacy Entities Consolidated Entities, Excluding Legacy Entities [Member] Consolidated Entities, Excluding Legacy Entities Proceeds from sale of non-controlling interests Contributions from redeemable non-controlling interests in Consolidated Funds Proceeds from Noncontrolling Interests Revenues Business Acquisition, Pro Forma Revenue And Unrealized Gains (Losses) Business Acquisition, Pro Forma Revenue And Unrealized Gains (Losses) Related Party Transactions [Abstract] Measurement Input Type [Axis] Measurement Input Type [Axis] Award Timing Disclosures [Line Items] Contributions from redeemable non-controlling interests in Consolidated Funds Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Financing Activities [Abstract] Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Financing Activities Focused commingled funds Incentive Fees, Focused Commingled Funds [Member] Incentive Fees, Focused Commingled Funds Other Income (Expense) Other Income And Other Expense [Policy Text Block] Other Income And Other Expense Fair value of awards vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Net realized and unrealized gain (loss) on investments Gain (Loss) on Investments Additional paid-in capital Additional Paid in Capital Net income Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Carried Interest Allocations Carried Interest Allocation [Member] Carried Interest Allocation Class A common stock issued in exchange for Class B and Class C partnership units (in shares) Stockholders' Equity, Units Exchanged In Offering, Shares Stockholders' Equity, Units Exchanged In Offering, Shares Contingent consideration Business Combination, Consideration Transferred, Liabilities Incurred Three Investments Three Investments [Member] Three Investments Incremental income from assumed vesting of units Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units Payments to related parties under Tax Receivable Agreements Payments to related partied under Tax Receivable Agreements Payments To Related Parties, Tax Receivable Agreements Payments To Related Parties, Tax Receivable Agreements Share-based Payment Arrangement, Tranche Three Share-Based Payment Arrangement, Tranche Three [Member] Income Taxes Income Tax, Policy [Policy Text Block] 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Three Contributed capital Partners' Capital Account, Contributions Insider Trading Arrangements [Line Items] 2024 Q1 Regular Dividend R2024Q1 [Member] R2024Q1 Related Party [Axis] Related Party, Type [Axis] Entity Registrant Name Entity Registrant Name Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Award Timing Method Award Timing Method [Text Block] Other assets and receivables Other assets and receivables Increase (Decrease) in Other Operating Assets Foreign income tax Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Two Adjustment to Compensation, Amount Adjustment to Compensation Amount Share-based Payment Arrangement, Tranche Two Share-Based Payment Arrangement, Tranche Two [Member] Fair value adjustment for acquisition-related contingent consideration Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Non-controlling interests Less: Amounts attributable to non-controlling interests Equity, Attributable to Noncontrolling Interest Auditor Name Auditor Name Comingled Funds Concentration Risk Comingled Funds Concentration Risk [Member] Comingled Funds Concentration Risk Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Disposal Group Name [Axis] Disposal Group Name [Axis] Entity Central Index Key Entity Central Index Key Change in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Equity-based compensation Share-Based Payment Arrangement, Expense Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Intangible assets, gross Finite-Lived Intangible Assets, Gross Reclassification of non-controlling interests in subsidiaries from redeemable equity Reclassification to permanent equity Reclassifications of Temporary to Permanent Equity Deferred financing costs Payments of Financing Costs Revenue Benchmark Revenue Benchmark [Member] Name Trading Arrangement, Individual Name Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Revenues Service fees Revenue from Contract with Customer, Excluding Assessed Tax Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag Weighted-average discount rate for operating leases Operating Lease, Weighted Average Discount Rate, Percent Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Class B2 units Class B2 Unit [Member] Class B2 Unit Business Combinations Business Combinations Policy [Policy Text Block] Leasehold improvements Leasehold Improvements [Member] General, Administrative and Other Selling, General and Administrative Expenses, Policy [Policy Text Block] Legacy Greenspring accrued carried interest-related compensation Legacy Investment, Accrued Carried Interest Related Compensation Payable Legacy Investment, Accrued Carried Interest Related Compensation Payable Diluted (in shares) Weighted-average shares of Class A common stock outstanding - Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Number of annual exchanges Transaction Agreement, Number of Annual Exchanges Transaction Agreement, Number of Annual Exchanges Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Total assets Assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Equity-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition 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 Non-NEOs Non-NEOs [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 Class Of Partnership Unit [Domain] Class Of Partnership Unit [Domain] Class Of Partnership Unit [Domain] 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] Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Non-PEO NEO Non-PEO NEO [Member] Adjustment to Compensation: Adjustment to Compensation [Axis] Common stock and units Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Basic (in shares) Weighted-average shares of Class A common stock outstanding – Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Revenues Revenues [Abstract] Product Information [Line Items] Product Information [Line Items] Related Party Transaction [Axis] Related Party Transaction [Axis] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Due to affiliates Increase (Decrease) in Due to Related Parties Statement [Line Items] Statement [Line Items] Exchange of units for Class A common stock and redemption of corresponding Class B common shares Stock Issued During Period, Value, Conversion of Convertible Securities Partner Type [Axis] Partner Type [Axis] Spread on base commitment fee percentage if utilization greater than 50% Line Of Credit Facility, Commitment Fee Percentage, Spread On Base If Utilization Greater Than 50 Percent Line Of Credit Facility, Commitment Fee Percentage, Spread On Base If Utilization Greater Than 50 Percent Schedule of Debt Obligations Schedule of Debt [Table Text Block] Proceeds from revolving credit facility Proceeds from Long-Term Lines of Credit Return to provision Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent Class A common stock issued for Greenspring acquisition Stock Issued For Acquisitions Stock Issued For Acquisitions Noncontrolling Interest Noncontrolling Interest [Member]