XML 72 R59.htm IDEA: XBRL DOCUMENT
v3.25.1

Employee Compensation and Benefits - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 09, 2023 | Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Compensation Items [Line Items] |  |  |  |  |
Partnership interest-based compensation |  | $ 12,225,000 | $ 30,002,000 |  |
Interest-based compensation, award modifications |  | 5,400,000 | 18,500,000 |  |
Unvested stated target payments |  | 14,600,000 | 0 |  |
Interest-based compensation expense, profit interest |  | 2,900,000 | 2,400,000 |  |
Holding Awards |  |  |  |  |
Compensation Items [Line Items] |  |  |  |  |
Partnership interest-based compensation |  | 0 | 3,600,000 |  |
Aggregate grant date fair value | $ 155,500,000 |  |  |  |
Target amount reserved |  |  |  | $ 80,000,000 |
Estimated holding period (in years) | 10 years |  |  |  |
Pre-tax cost of equity percentage | 15.40% |  |  |  |
Discount rate (as percent) | 13.00% |  |  |  |
Volatility rate (as percent) | 35.00% |  |  |  |
Discount rate for lack of marketability (as percent) | 40.00% |  |  |  |
Holdings, Holdings II and Management LLC |  |  |  |  |
Compensation Items [Line Items] |  |  |  |  |
Partnership interest-based compensation |  | 12,200,000 | 30,000,000.0 |  |
GCMH Equityholders Awards |  |  |  |  |
Compensation Items [Line Items] |  |  |  |  |
Partnership interest-based compensation |  | 3,900,000 | $ 5,500,000 |  |
Equityholders awards, aggregate grant fair value (in shares) |  |  |  |  | 7,169,415
Aggregate grant date fair value |  |  |  |  | $ 53,400,000
Equityholders awards, grant fair value (in dollars per share) |  |  |  |  | $ 7.45
Nonvested award, cost not yet recognized, amount |  | $ 1,800,000 |  |  |
Nonvested award, cost not yet recognized, period for recognition (in years) |  | 1 month 6 days |  |  |

X
- Definition Compensation Items [Line Items] + References No definition available. + Details
Name: | gcm_CompensationItemsLineItems
Namespace Prefix: | gcm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Partnership Interest, Aggregate Grant Date Fair Value + References No definition available. + Details
Name: | gcm_PartnershipInterestAggregateGrantDateFairValue
Namespace Prefix: | gcm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Partnership Interest-based Compensation Expense + References No definition available. + Details
Name: | gcm_PartnershipInterestBasedCompensationExpense
Namespace Prefix: | gcm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Partnership Interest-based Compensation Expense, Award Modifications + References No definition available. + Details
Name: | gcm_PartnershipInterestBasedCompensationExpenseAwardModifications
Namespace Prefix: | gcm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Partnership Interest-based Compensation Expense, Profit Interest + References No definition available. + Details
Name: | gcm_PartnershipInterestBasedCompensationExpenseProfitInterest
Namespace Prefix: | gcm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Partnership Interest, Equityholders Awards, Aggregate Grant Date Fair Value + References No definition available. + Details
Name: | gcm_PartnershipInterestEquityholdersAwardsAggregateGrantDateFairValue
Namespace Prefix: | gcm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Partnership Interest, Equityholders Awards, Grant Date Fair Value + References No definition available. + Details
Name: | gcm_PartnershipInterestEquityholdersAwardsGrantDateFairValue
Namespace Prefix: | gcm_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Partnership Interest, Nonvested Award, Cost Not yet Recognized, Amount + References No definition available. + Details
Name: | gcm_PartnershipInterestNonvestedAwardCostNotYetRecognizedAmount
Namespace Prefix: | gcm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Partnership Interest, Nonvested Award, Cost Not yet Recognized, Period for Recognition + References No definition available. + Details
Name: | gcm_PartnershipInterestNonvestedAwardCostNotYetRecognizedPeriodForRecognition
Namespace Prefix: | gcm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Partnership Interest, Reversed Target Amount + References No definition available. + Details
Name: | gcm_PartnershipInterestReversedTargetAmount
Namespace Prefix: | gcm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount Rate + References No definition available. + Details
Name: | gcm_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDiscountRate
Namespace Prefix: | gcm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Pre-Tax Cost Of Equity + References No definition available. + Details
Name: | gcm_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsPreTaxCostOfEquity
Namespace Prefix: | gcm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Unvested Stated Target Payments + References No definition available. + Details
Name: | gcm_UnvestedStatedTargetPayments
Namespace Prefix: | gcm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Restrictions on equity-based instruments during the vesting period, such as the inability to transfer unvested awards, are not taken into account in estimating the fair value of the award. However, restrictions that remain in effect after an award is vested, such as the inability to transfer or hedge vested options or a prohibition on the sale of outstanding vested shares (or other type of equity) for a period of time, affect the estimate of an award's fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(v) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDiscountForPostvestingRestrictions
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=gcm_HoldingsAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=gcm_HoldingsHoldingsIIAndManagementLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=gcm_GCMHEquityholdersAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |