Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Other Noncontrolling Subsidiaries Other Noncontrolling Subsidiaries [Member] Other Noncontrolling Subsidiaries Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Equity reallocation between controlling and noncontrolling interests Noncontrolling Interest, Reallocation From (To) Noncontrolling Interest Noncontrolling Interest, Reallocation From (To) Noncontrolling Interest Statistical Measurement [Domain] Statistical Measurement [Domain] Deferred tax and other tax adjustments Adjustments to Additional Paid in Capital, Deferred Tax Adjustment Adjustments to Additional Paid in Capital, Deferred Tax Adjustment Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Net income attributable to common stockholders, diluted Net income attributable to common stockholders, diluted Net Income (Loss) Available to Common Stockholders, Diluted Document Fiscal Year Focus Document Fiscal Year Focus Fair Value, Asset (Liability) Derivative Assets (Liabilities), at Fair Value, Net Weighted average interest rate (as percent) Debt, Weighted Average Interest Rate Adjustment to Compensation, Amount Adjustment to Compensation Amount Number of RSUs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Exchange of partnership units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Partnership Units Incremental Common Shares Attributable to Dilutive Effect of Partnership Units Remaining equity method investment, ownership percentage Equity Method Investment, Remaining Ownership Percentage Equity Method Investment, Remaining Ownership Percentage Segment Reporting [Abstract] Incentive fees receivable Increase (Decrease) in Contract with Customer, Asset, Incentive Fees Receivable Increase (Decrease) in Contract with Customer, Asset, Incentive Fees Receivable Common stock Common Stock, Value, Issued 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Schedule of Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Settlement of equity-based compensation in satisfaction of withholding tax requirements Payment, Tax Withholding, Share-Based Payment Arrangement Non-cash lease expense Non-Cash Lease Expense Non-Cash Lease Expense Schedule of Outstanding Debt Balance Schedule of Long-Term Debt Instruments [Table Text Block] Management fees receivable Management Fee Receivable Management Fee Receivable Credit Facility Line of Credit [Member] Restatement Determination Date Restatement Determination Date Distributions from investments Proceeds from Sale, Maturity and Collection of Investments Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Derivative Instrument [Axis] Derivative Instrument [Axis] Management fees receivable Increase (Decrease) in Contract with Customer, Asset, Management Fees Receivable Increase (Decrease) in Contract with Customer, Asset, Management Fees Receivable Realized carried interest of deferred revenue Contract With Customer, Liability, Realized Carried Interest Contract With Customer, Liability, Realized Carried Interest Amendment Flag Amendment Flag Consolidated Entities [Axis] Consolidated Entities [Axis] Treasury stock acquired, average cost (in dollars per share) Shares Acquired, Average Cost Per Share Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Class of Warrant or Right [Table] Class of Warrant or Right [Table] Change in fair value of warrant liabilities Change in fair value of warrant liabilities Change in fair value of warrants Fair Value Adjustment of Warrants Expected total value to paid in capital – private assets Measurement Input Expected Total Value To Paid In Capital [Member] Measurement Input Expected Total Value To Paid In Capital Loss Contingencies [Table] Loss Contingencies [Table] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Proceeds from Share Purchase Agreement, net Proceeds from Share Purchase Agreement Proceeds from Share Purchase Agreement Consolidated Entities [Domain] Consolidated Entities [Domain] Related Parties Related Party Transactions Disclosure [Text Block] Capital distributions paid to noncontrolling interests in subsidiaries Payments to Noncontrolling Interests Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Foreign currency translation adjustment Translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Assets Assets, Fair Value Disclosure [Abstract] Equity-based compensation, equity-classified awards Employee Benefit and Share-Based Payment Arrangement, Noncash Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Notional Amount Derivative, Notional Amount Partnership interest-based compensation Partnership interest-based compensation Partnership Interest-based Compensation Expense Partnership Interest-based Compensation Expense Basic (in shares) Weighted-average shares, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Partnership Units Partnership Units [Member] Partnership Units Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of reportable segments Number of Reportable Segments 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Schedule of Interest Rate Derivatives Recorded as Derivative Liability Schedule of Derivative Instruments [Table Text Block] Equityholders awards, grant fair value (in usd per share) Partnership Interest, Equityholders Awards, Grant Date Fair Value Partnership Interest, Equityholders Awards, Grant Date Fair Value Percent of asset acquired (as percent) Property, Plant, and Equipment, Percent of Asset Acquired Property, Plant, and Equipment, Percent of Asset Acquired Entity Address, City or Town Entity Address, City or Town Granted (in shares) Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Reclassified to equity-classified RSUs (in dollar per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Reclassified Equity-Classified Awards in Period, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Reclassified Equity-Classified Awards in Period, Weighted Average Grant Date Fair Value Document Information [Line Items] Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested in period (in shares) Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Class of Stock [Axis] Class of Stock [Axis] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net income attributable to common stockholders, basic Net Income (Loss) Available to Common Stockholders, Basic Dividends paid Payments of Ordinary Dividends Supplemental disclosure of cash flow information from operating activities Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Less: sublease income Sublease Income Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Investment income Investment income Investment Income, Nonoperating Subsequent Event Type [Axis] Subsequent Event Type [Axis] Net change in cash flow hedges Net change in cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Non-cash premises and equipment additions in accrued expenses and other liabilities Capital Expenditures Incurred but Not yet Paid Management fees receivable Contract with Customer, Asset, Management Fees Receivable Contract with Customer, Asset, Management Fees Receivable Vested but not yet delivered (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested But Not Yet Delivered in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested But Not Yet Delivered in Period Amortization of debt issuance costs Amortization of Debt Issuance Costs Incentive fees Total incentive fees Management Service, Incentive [Member] Related Party [Axis] Related and Nonrelated Parties [Axis] Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] Warrant exercise price (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Debt Total debt Long-Term Debt Schedule of Maturities of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Document Period End Date Document Period End Date Change in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Face amount Debt Instrument, Face Amount Basic EPS Earnings Per Share, Basic [Abstract] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Equity Equity [Text Block] Expenses Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name Capital contributions received from noncontrolling interests in subsidiaries Proceeds from Noncontrolling Interests Vested in period, fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Total liabilities Liabilities, Fair Value Disclosure Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Class B common stock Common Class B [Member] Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Variable Component, Two Variable Component, Two [Member] Variable Component, Two Change in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Interest-based compensation, award modifications Partnership Interest-based Compensation Expense, Award Modifications Partnership Interest-based Compensation Expense, Award Modifications Statement of Comprehensive Income [Abstract] Earnings (Loss) Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings (loss) per share of Class A common stock: Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Discount rate Measurement Input, Discount Rate [Member] Accumulated Other Comprehensive Income (Loss) AOCI Including Portion Attributable to Noncontrolling Interest [Member] Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Number of derivative instruments terminated Number of Derivative Instruments Terminated Number of Derivative Instruments Terminated Company Selected Measure Name Company Selected Measure Name Sale of Stock [Domain] Sale of Stock [Domain] Income Tax Disclosure [Abstract] Fixed Rate Paid Derivative, fixed interest rate Derivative, Fixed Interest Rate Less: Net income attributable to noncontrolling interests in subsidiaries Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable Diluted EPS Earnings Per Share, Diluted [Abstract] Supplemental disclosure of non-cash information from financing activities Noncash Investing and Financing Items [Abstract] Ownership percentage by parent Subsidiary, Ownership Percentage, Parent Senior loan Total Long-term debt outstanding Long-Term Debt, Gross Credit Facility [Domain] Credit Facility [Domain] Related Party Transactions [Abstract] Cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Due from related parties Other Receivables, Net, Current Shares, issued (in shares) Shares, Issued Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Warrant Warrant [Member] Fund expense reimbursement revenue Expense Reimbursement [Member] Expense Reimbursement Diluted (in shares) Weighted-average shares, diluted (in shares) Weighted-average shares, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Declared dividends Dividends Deferred income tax expense Deferred Income Taxes and Tax Credits Proceeds from derivative instrument Proceeds from Derivative Instrument, Financing Activities Interest Rate Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Dividends payable Dividends Payable Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Maximum exposure to loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Revenue from Contract with Customer [Abstract] Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Amended 2030 Term Loans Amended Term Loan Facility Due February 24, 2030 [Member] Amended Term Loan Facility Due February 24, 2030 Interest-based compensation expense, profit interest Partnership Interest-based Compensation Expense, Profit Interest Partnership Interest-based Compensation Expense, Profit Interest Cash paid for amounts included in the measurement of operating lease liabilities Operating Lease, Payments Noncontrolling Interests in GCMH Noncontrolling Interest, Limited Partnerships [Member] Noncontrolling Interest, Limited Partnerships Award Timing Predetermined Award Timing Predetermined [Flag] Liability-Classified RSUs Liability-Classified RSUs [Member] Liability-Classified RSUs Employee Compensation and Benefits Compensation Related Costs, General [Text Block] Grove Lane Partners LLC Grove Lane Partners LLC [Member] Grove Lane Partners LLC Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Equity-based compensation, equity-classified awards APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Fair Value, Inputs, Level 1 [Member] Proceeds from exercise of warrants Proceeds from Warrant Exercises Aircraft Utilization Aircraft Utilization [Member] Aircraft Utilization Effective income expense (benefit) tax rate (as percent) Effective Income Tax Rate Reconciliation, Percent Organization, Consolidation and Presentation of Financial Statements [Abstract] Total lease payments Lessee, Operating Lease, Liability, to be Paid Notional amount Derivative Asset, Notional Amount Exercise of warrants- incremental shares under treasury stock method (in shares) Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Assumed vesting of RSUs - incremental shares under the treasury stock method (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Pamela Bentley [Member] Pamela Bentley 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 All Executive Categories All Executive Categories [Member] Other non-cash compensation Other non-cash compensation Other Labor-related Expenses Lease liabilities, net Increase (Decrease) in Operating Lease Liability Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Deemed contributions from GCMH Equityholders Deemed Contributions From Equityholders Deemed Contributions From Equityholders Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Class of Warrant or Right [Line Items] Class of Warrant or Right [Line Items] Warrants Other Liabilities Disclosure [Text Block] Other non-cash compensation Other Non-Cash Compensation Other Non-Cash Compensation Scenario [Domain] Scenario [Domain] Measurement input Alternative Investment, Measurement Input Issuance of Class A common stock due to exercised warrants Stock Issued During Period, Value, Warrants Exercised Stock Issued During Period, Value, Warrants Exercised Lease right-of-use assets Operating Lease, Right-of-Use Asset Cash-based incentive fee related compensation Cash-based incentive fee related compensation Incentive Fee Related Compensation Incentive Fee Related Compensation Sale of stock, value of shares authorized Sale of Stock, Value of Shares Authorized Sale of Stock, Value of Shares Authorized Amount of gain (loss) expected to be reclassified to interest expense in next twelve months Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Schedule of Reconciliation of Basic and Diluted Earnings (Loss) Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Segments Segment Reporting [Text Block] Line of credit outstanding Long-Term Line of Credit Minimum Minimum [Member] Capital commitment Investment Company, Payments Of Committed Capital Investment Company, Payments Of Committed Capital Expiration Date Trading Arrangement Expiration Date 2030 Long-Term Debt, Maturity, Year Four Other investments Investments, Fair Value Disclosure Liabilities Liabilities [Abstract] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Weighted average shares of Class A common stock outstanding: Denominator for earnings (loss) per share calculation: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Money market funds Cash and Cash Equivalents, Fair Value Disclosure Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Stock repurchase program, increase in authorized amount Stock Repurchase Program, Increase In Authorized Amount Stock Repurchase Program, Increase In Authorized Amount Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Compensation Items [Line Items] Compensation Items [Line Items] Compensation Items [Line Items] Affiliated Entity Affiliated Entity [Member] Derivative, floor (as percent) Derivative, Floor Interest Rate Amended 2028 Term Loans Amended Term Loan Facility Due February 24, 2028 [Member] Amended Term Loan Facility Due February 24, 2028 Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Proceeds from Share Purchase Agreement, net Proceeds from Issuance of Common Stock Common stock, authorized (in shares) Common Stock, Shares Authorized Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Number of shares issued (in shares) Sale of Stock, Number of Shares Issued in Transaction Schedule of Employee Compensation and Benefits Schedule of Employee Compensation and Benefits [Table Text Block] Schedule of Employee Compensation and Benefits Exercise Price Award Exercise Price Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Related Party Transaction [Axis] Related Party Transaction [Axis] Lessee, operating lease, remaining lease term Lessee, Operating Lease, Remaining Lease Term Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Amortization of terminated swap Amortization of Terminated Swap Amortization of Terminated Swap Segment Reporting [Line Items] Segment Reporting [Line Items] Stock repurchase program, authorized amount Share Repurchase Program, Authorized, Amount Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Net receivables from related parties Accounts Receivable, after Allowance for Credit Loss Debt Debt Disclosure [Text Block] Carried interest Management Service, Incentive, Carried Interest [Member] Management Service, Incentive, Carried Interest Scenario [Axis] Scenario [Axis] Movement in AOCI Related to Cash Flow Hedges [Roll Forward] Movement in AOCI Related to Cash Flow Hedges [Roll Forward] Movement in AOCI Related to Cash Flow Hedges Less: debt issuance costs Debt issuance costs write offs Debt Issuance Costs, Net Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity method investments Equity Method Investments Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Change in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Measurement Input Type [Domain] Measurement Input Type [Domain] Fixed Management Fee Fixed Management Fee [Member] Fixed Management Fee Aggregate price Sale of Stock, Consideration Received on Transaction Adoption Date Trading Arrangement Adoption Date Counterparty Name [Domain] Counterparty Name [Domain] Total GCM Grosvenor Inc. equity Equity, Attributable to Parent Net other income Nonoperating Income (Expense) Noncontrolling Interests in Subsidiaries Noncontrolling Interest, Other Noncontrolling Interests [Member] Noncontrolling Interest, Other Noncontrolling Interests Assets Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Other Liabilities Disclosure [Abstract] Other Liabilities Disclosure [Abstract] Other investments Other Investments Accounting Policies [Abstract] Capital distributions paid to partners and member Payments of Capital Distribution Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Lease liabilities Total operating lease liabilities Operating Lease, Liability Insider Trading Policies and Procedures [Line Items] Sale of stock, volume-weighted average price, period Sale of Stock, Volume-Weighted Average Price, Period Sale of Stock, Volume-Weighted Average Price, Period Private warrants Private Warrants [Member] Private Warrants Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Reclassified from liability-classified RSUs (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Reclassified From Liability Classified in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Reclassified From Liability-Classified Awards In Period 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] General, administrative and other Selling, General and Administrative Expense Repayments of debt Repayments of Debt Less: tenant improvement allowance Lessee, Operating Lease, Tenant Improvement Allowance Lessee, Operating Lease, Tenant Improvement Allowance Interest expense Interest Income (Expense), Nonoperating Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Accrued compensation and employee related obligations Accrued Employee Benefits Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Number of operating segments Number of Operating Segments Antidilutive securities excluded from computation of earnings per share, amount (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Entity Central Index Key Entity Central Index Key Weighted Average Weighted Average [Member] All Adjustments to Compensation All Adjustments to Compensation [Member] Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Remainder of 2026 Long-Term Debt, Maturity, Remainder of Fiscal Year Holdings, Holdings II and Management LLC Holdings, Holdings II and Management LLC [Member] Holdings, Holdings II and Management LLC Income Statement [Abstract] Document Transition Report Document Transition Report Ownership [Axis] Ownership [Axis] Noncontrolling interests in GCMH Noncontrolling Interest in Limited Partnerships Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Exchange of Partnership units for Class A common stock Issuance of Partnership Units, Value, Conversion of Convertible Securities Issuance of Partnership Units, Value, Conversion of Convertible Securities Investment, Name [Axis] Investment, Name [Axis] Cash-based employee compensation and benefits Cash-based employee compensation and benefits Salary and Wage, Excluding Cost of Good and Service Sold Sumitomo Mitsui Trust Bank, Limited Sumitomo Mitsui Trust Bank, Limited [Member] Sumitomo Mitsui Trust Bank, Limited Deferred tax assets, net Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Basis spread on variable rate (as percent) Debt Instrument, Basis Spread on Variable Rate Distributions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Distributions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Distributions Other Commitments [Domain] Other Commitments [Domain] City Area Code City Area Code Document Information [Table] Document Information [Table] All Individuals All Individuals [Member] Subsequent Events Subsequent Events [Text Block] Aggregate grant date fair value Partnership Interest, Aggregate Grant Date Fair Value Partnership Interest, Aggregate Grant Date Fair Value Name Forgone Recovery, Individual Name 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] Period for recognition (in years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Receivables Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Management Fees Receivables Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Management Fees Receivables Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] 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] Statement [Line Items] Statement [Line Items] Management fees, net Management Fees, Before Reimbursement Revenue [Member] Management Fees, Before Reimbursement Revenue Total assets Assets Entity [Domain] Entity [Domain] Preferred stock issued (in shares) Preferred Stock, Shares Issued Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Operating Segments Operating Segments [Member] Interest Rate Swap, 4.17% Interest Rate Swap, 4.17% [Member] Interest Rate Swap, 4.17% Interest expense Interest Expense, Nonoperating Capital contributions from noncontrolling interests in subsidiaries Noncontrolling Interest, Increase from Sale of Parent Equity Interest Less: Comprehensive income attributable to noncontrolling interests in GCMH Comprehensive Income (Loss), Net of Tax, Attributable to Limited Partnerships, Nonredeemable Comprehensive Income (Loss), Net of Tax, Attributable to Limited Partnerships, Nonredeemable Equity-Based Compensation Share-Based Payment Arrangement [Text Block] Other assets Increase (Decrease) in Other Operating Assets Issuance of Class A common stock (in shares) Stock Issued During Period, Shares, New Issues PEO PEO [Member] 2028 Long-Term Debt, Maturity, Year Two Equity-based compensation Equity-based compensation Share-Based Payment Arrangement, Expense Shares cancelled (in shares) Stock Repurchased and Retired During Period, Shares Goodwill Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Supplemental disclosure of cash flow information from investing activities Additional Cash Flow Elements, Investing Activity [Abstract] Investments Total investments Total investments Investments 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 Class C common stock Common Class C [Member] Revenue recognized Contract with Customer, Liability, Revenue Recognized Subsequent Event Type [Domain] Subsequent Event Type [Domain] Retained Earnings Retained Earnings [Member] Total operating expenses Operating Expenses Revolving Credit Facility Revolving Credit Facility [Member] 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 Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Schedule of Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, outstanding (in shares) Common stock outstanding, beginning balance (in shares) Common stock outstanding, ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Diluted (in dollars per share) Net income (loss) per share attributable common stockholders, diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Settlement of equity-based compensation in satisfaction of withholding tax requirements Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Liabilities Liabilities, Fair Value Disclosure [Abstract] Accrued compensation and employee related obligations Increase (Decrease) in Employee Related Liabilities Non-cash investment income Unrealized Gain (Loss) on Investments Amended Term Loan Facility Due February 24, 2028, Amendment 8 Amended Term Loan Facility Due February 24, 2028, Amendment 8 [Member] Amended Term Loan Facility Due February 24, 2028, Amendment 8 Management fees Total management fees Asset Management [Member] Intangible Asset, Finite-Lived [Line Items] Intangible Asset, Finite-Lived [Line Items] Ownership [Domain] Ownership [Domain] 2029 Long-Term Debt, Maturity, Year Three Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Total operating revenues Revenue Segment operating revenue Revenue from Contract with Customer, Excluding Assessed Tax Premises and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Other operating income Service, Other [Member] Schedule of Components of Investments Investment [Table Text Block] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Revenues Revenue from Contract with Customer [Text Block] Noncontrolling interests in subsidiaries Other Noncontrolling Interests Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Periodic principal payment Debt Instrument, Periodic Payment, Principal Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Variable Component, One Variable Component, One [Member] Variable Component, One Segment Reporting [Table] Segment Reporting [Table] Payable to related parties pursuant to the tax receivable agreement Payable To Related Parties Pursuant To Tax Receivable Agreement Payable To Related Parties Pursuant To Tax Receivable Agreement Investments Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Investments Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Investments Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Annual management fee Other Commitment, Annual Amount Other Commitment, Annual Amount Unfunded Commitments Capital Funding Commitments [Member] Capital Funding Commitments Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Compensation Items [Table] Compensation Items [Table] Compensation Items [Table] Sale of Stock [Axis] Sale of Stock [Axis] Schedule of Lease, Cost Lease, Cost [Table Text Block] Deemed contributions Noncontrolling Interest, Increase Deemed Contributions Noncontrolling Interest, Increase Deemed Contributions Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Balance at beginning of period Balance at end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Schedule of Assets and Liabilities, Measured at Fair Value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Amount reclassified from AOCI to interest expense, tax benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Operating income Operating Income (Loss) Schedule of Dividends Declared Dividends Declared [Table Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Related Party Transaction [Domain] Related Party Transaction [Domain] Equity-Classified RSUs Equity-Classified RSUs [Member] Equity-Classified RSUs Repurchase of Class A Shares (in shares) Stock Repurchased During Period, Shares Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Common stock, dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Capital distributions paid to noncontrolling interests in subsidiaries / Partners’ distributions Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Debt, LIBOR floor (as percent) Debt Instrument, Interest Rate Floor Debt Instrument, Interest Rate Floor Common stock, issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] Balance at beginning of period Balance at end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Schedule of Maximum Exposure to Loss Relating to Non-consolidated VIEs Schedule of Variable Interest Entities [Table Text Block] Exercises of warrants (in shares) Exercises of warrants (in shares) Stock Issued During Period, Shares, Warrants Exercised Stock Issued During Period, Shares, Warrants Exercised Equity Components [Axis] Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Related Party Related Party [Member] Carried interest compensation Carried interest compensation Compensation Expense, Carried Interest Compensation Expense, Carried Interest Class of Stock [Line Items] Class of Stock [Line Items] Cash paid during the period for income taxes, net Income Tax Paid, after Refund Received Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Class A common stock Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Comprehensive income attributable to GCM Grosvenor Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Thereafter Lessee, Operating Lease, Liability, to be Paid, Due after Year Four Lessee, Operating Lease, Liability, to be Paid, Due after Year Four Other Commitments [Axis] Other Commitments [Axis] Private Warrants Private Placement Warrants [Member] Private Placement Warrants Subsequent Events [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] GCMH Equityholders Awards GCMH Equityholders Awards [Member] GCMH Equityholders Awards Document Type Document Type 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] Accrued expenses and other liabilities Accrued Liabilities, Current Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Fair Value as of Grant Date Award Grant Date Fair Value Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Stock repurchase program, remaining authorized repurchase amount Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Organization Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Partnership interest, equityholders awards, settlement shares (in shares) Partnership Interest, Equityholders Awards, Settlement Shares Partnership Interest, Equityholders Awards, Settlement Shares Debt prepayment cost Payment for Debt Extinguishment or Debt Prepayment Cost Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Expected term (in years) Warrants and Rights Outstanding, Term Commitments and contingencies (Note 13) Commitments and Contingencies Reportable Segment Reportable Segment [Member] Reportable Segment Cash received for lease incentives Proceeds From Operating Lease Incentives Proceeds From Operating Lease Incentives Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Other investments and securities, at cost Other Investments and Securities, at Cost Award vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Counterparty Name [Axis] Counterparty Name [Axis] Liabilities and Equity Liabilities and Equity [Abstract] Reclassified to equity-classified RSUs (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Reclassified To Equity -Classified Awards In Period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Reclassified To Equity -Classified Awards In Period Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Remainder of 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Warrants outstanding (in shares) Class of Warrant or Right, Outstanding Fair Value Measurements Fair Value Disclosures [Text Block] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Level 3 Fair Value, Inputs, Level 3 [Member] Amount reclassified from accumulated other comprehensive income (loss) to interest expense Amount reclassified from accumulated other comprehensive income (loss) to interest expense Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Supplemental disclosure of cash flow information Supplemental Cash Flow Information [Abstract] Repurchased (in shares) Treasury Stock, Shares, Acquired PEO Name PEO Name Accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Prepayment deadline following quarterly financial statements (in days) Debt Instrument, Prepayment Deadline Following Quarterly Financial Statement Debt Instrument, Prepayment Deadline Following Quarterly Financial Statement Property, Plant and Equipment, Type [Axis] Long-Lived Asset, Class [Axis] Other assets Other assets Other Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Due from related parties Increase (Decrease) in Due from Related Parties Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Establishment of deferred tax assets, net related to non-cash activities Establishment of Deferred Tax Assets, Net Related to Non-cash Activities Establishment of Deferred Tax Assets, Net Related to Non-cash Activities Amount recognized in other comprehensive income (loss) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Tax benefit Share-Based Payment Arrangement, Expense, Tax Benefit Repurchase of Class A common stock Repurchase of Class A common stock Treasury Stock, Value, Acquired, Cost Method Unvested stated target payments Unvested Stated Target Payments Unvested Stated Target Payments Beginning of period End of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest [Member] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Comprehensive income before noncontrolling interests Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Equity method investment, ownership percentage Equity Method Investment, Ownership Percentage Employee compensation and benefits Total employee compensation and benefits Labor and Related Expense Total lease cost Lease, Cost Exchange of Partnership units for Class A common stock and cancellation of Class C common stock (in shares) Shares converted (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Amounts of transaction Related Party Transaction, Amounts of Transaction Investment, Name [Domain] Investment, Name [Domain] 2027 Long-Term Debt, Maturity, Year One Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Company's Noncontrolling Interest Holders Company's Noncontrolling Interest Holders [Member] Company's Noncontrolling Interest Holders Basic (in dollars per share) Net income per share attributable to common stockholders, basic (in dollars per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Payments to repurchase Class A common stock Payments to repurchase Class A common stock Payments for Repurchase of Common Stock Incentive fees receivable Contract with Customer, Asset, Incentive Fees Receivable Contract with Customer, Asset, Incentive Fees Receivable Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Short-term lease, cost Short-Term Lease, Cost Equityholders awards, aggregate grant fair value (in shares) Partnership Interest, Equityholders Awards, Aggregate Grant Date Fair Value Partnership Interest, Equityholders Awards, Aggregate Grant Date Fair Value Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Performance fees Management Service, Incentive, Performance Fees [Member] Management Service, Incentive, Performance Fees Retained earnings Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Interest Rate Swap, 4.47% Interest Rate Swap, 4.47% [Member] Interest Rate Swap, 4.47% Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] GCMH Grosvenor Capital Management Holdings, LLLP [Member] Grosvenor Capital Management Holdings, LLLP Common Stock Common Stock [Member] Operating lease cost Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Less: Comprehensive income attributable to noncontrolling interests in subsidiaries Comprehensive Income (Loss), Net of Tax, Attributable to Other Noncontrolling Interests, Nonredeemable Comprehensive Income (Loss), Net of Tax, Attributable to Other Noncontrolling Interests, Nonredeemable Derivative Contract [Domain] Derivative Contract [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Total liabilities and equity Liabilities and Equity Variable lease cost Variable Lease, Cost Employee Stock Option Share-Based Payment Arrangement, Option [Member] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related Party [Domain] Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Other income Other income Other Nonoperating Income (Expense) Principal payments on Senior Loan Repayments of Senior Debt Name Awards Close in Time to MNPI Disclosures, Individual Name Share-Based Compensation Arrangement, Variable Component [Axis] Share-Based Compensation Arrangement, Variable Component [Axis] Share-Based Compensation Arrangement, Variable Component Contributions/subscriptions to investments Payments to Acquire Investments Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Aircraft Air Transportation Equipment [Member] Property, Plant and Equipment, Type [Domain] Long-Lived Asset, Class [Domain] Public warrants Public Warrants [Member] Public Warrants Share price (in usd per share) Sale of Stock, Price Per Share Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, $0.0001 par value, 100,000,000 shares authorized, none issued Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid during the period for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Aggregate grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Aggregate Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Aggregate Grant Date Fair Value Commitment amount Other Commitment Schedule of Common Stock Outstanding Schedule of Stock by Class [Table Text Block] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets Assets, Fair Value Disclosure Investments Investment, Policy [Policy Text Block] Other Awards Other Awards [Member] Other Awards Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Total capital commitment Investment Company, Committed Capital At-The-Market At-The-Market [Member] At-The-Market Name Trading Arrangement, Individual Name Cost not yet recognized Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Less: Net income attributable to noncontrolling interests in GCMH Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Expected remaining term (years) Measurement Input, Expected Term [Member] Operating lease, expense Operating Lease, Expense Compensation Related Costs [Abstract] Company Selected Measure Amount Company Selected Measure Amount Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Proceeds received from investments Proceeds from Equity Method Investment, Distribution Equity Method Investments and Joint Ventures [Abstract] Depreciation and amortization expense Depreciation, Depletion and Amortization Share-Based Compensation Arrangement, Variable Component [Domain] Share-Based Compensation Arrangement, Variable Component [Domain] Share-Based Compensation Arrangement, Variable Component [Domain] Net shares delivered for vested RSUs (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Interest Rate Swap, 4.37% Interest Rate Swap, 4.37% [Member] Interest Rate Swap, 4.37% Weighted average remaining lease term in years Operating Lease, Weighted Average Remaining Lease Term Interest rate derivatives Derivative Liability Non-PEO NEO Non-PEO NEO [Member] Senior loan Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Non-cash right-of-use assets obtained in exchange for new and modified operating leases Non-cash ROU assets obtained in exchange for new and extended operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 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 Provision (benefit) for income taxes Income Tax Expense (Benefit) Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Net income (loss) Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Award Timing Method Award Timing Method [Text Block] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forecast Forecast [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net income attributable to GCM Grosvenor Inc. Net income attributable to GCM Grosvenor Inc., basic Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Adjustments and reconciling items Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Restatement Determination Date: Restatement Determination Date [Axis] Number of shares called by each warrant (in shares) Class of Warrant or Right, Number of Securities Called by Each Warrant or Right Outstanding loan balance subject to the guarantee Outstanding Loan Balance Subject to the Guarantee Outstanding Loan Balance Subject to the Guarantee Non-cash change in payable to related parties pursuant to tax receivable agreement Non-Cash Change in Payable to Related Parties Pursuant to Tax Receivable Agreement Non-Cash Change in Payable to Related Parties Pursuant to Tax Receivable Agreement Non-cash adjustment to operating lease right-of-use assets from lease modification Non-Cash Adjustment To Operating Lease Right-Of-Use Assets From Lease Modification Non-Cash Adjustment To Operating Lease Right-Of-Use Assets From Lease Modification GCM Holdings GCM Holdings [Member] GCM Holdings Reclassified to liability-classified RSUs (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Reclassified Liability-Classified Awards in Period, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Reclassified From Liability Classified RSUs In Period, Weighted Average Grant Date Fair Value Amended Term Loan Facility Due February 24, 2028, Amendment 7 Amended Term Loan Facility Due February 24, 2028, Amendment 7 [Member] Amended Term Loan Facility Due February 24, 2028, Amendment 7 Class A Common Stock And Warrants Class A Common Stock And Warrants [Member] Class A Common Stock And Warrants Revenues Revenues [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Exchange of Partnership units Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities Numerator for earnings (loss) per share calculation: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]