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Warrants - Public Warrants and Private Warrants Outstanding (Details) - shares | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Movements of Class of Warrants Outstanding [Roll Forward] |  |  |
Outstanding, beginning of period (in shares) | 17,684,970 | 17,684,970 | 20,497,764
Exercises of warrants (in shares) | 0 | 0 | (30)
Repurchase (in shares) | 0 | 0 | (2,812,764)
Outstanding, end of period (in shares) | 17,684,970 | 17,684,970 | 17,684,970
Public Warrants |  |  |
Movements of Class of Warrants Outstanding [Roll Forward] |  |  |
Outstanding, beginning of period (in shares) | 16,784,970 | 16,784,970 | 19,597,764
Exercises of warrants (in shares) | 0 | 0 | (30)
Repurchase (in shares) | 0 | 0 | (2,812,764)
Outstanding, end of period (in shares) | 16,784,970 | 16,784,970 | 16,784,970
Private Warrants |  |  |
Movements of Class of Warrants Outstanding [Roll Forward] |  |  |
Outstanding, beginning of period (in shares) | 900,000 | 900,000 | 900,000
Exercises of warrants (in shares) | 0 | 0 | 0
Repurchase (in shares) | 0 | 0 | 0
Outstanding, end of period (in shares) | 900,000 | 900,000 | 900,000

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- Definition Class of Warrant or Right, Repurchased During Period, Shares + References No definition available. + Details
Name: | gcm_ClassOfWarrantOrRightRepurchasedDuringPeriodShares
Namespace Prefix: | gcm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Movements of Class of Warrants Outstanding + References No definition available. + Details
Name: | gcm_MovementsOfClassOfWarrantsOutstandingRollForward
Namespace Prefix: | gcm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Stock Issued During Period, Shares, Warrants Exercised + References No definition available. + Details
Name: | gcm_StockIssuedDuringPeriodSharesWarrantsExercised
Namespace Prefix: | gcm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=gcm_PublicWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=gcm_PrivatePlacementWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |