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Warrants - Public Warrants and Private Warrants Outstanding (Details) | 3 Months Ended
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Mar. 31, 2025 shares
Class of Warrant or Right [Line Items] |
Outstanding, beginning of period (in shares) | 17,684,970
Exercises of warrants (in shares) | (240,190)
Outstanding, end of period (in shares) | 17,444,780
Public warrants |
Class of Warrant or Right [Line Items] |
Outstanding, beginning of period (in shares) | 16,784,970
Exercises of warrants (in shares) | (240,190)
Outstanding, end of period (in shares) | 16,544,780
Private warrants |
Class of Warrant or Right [Line Items] |
Outstanding, beginning of period (in shares) | 900,000
Exercises of warrants (in shares) | 0
Outstanding, end of period (in shares) | 900,000

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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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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: |