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Equity - Schedule of Repurchase of Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Class of Warrant or Right [Line Items] |  |  |
Public warrants (in shares) | 0 | 0 | 2,812,764
Total cost of public warrants repurchases | $ 0 | $ 0 | $ 2,569
Public warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Public warrants (in shares) | 0 | 0 | 2,812,764
Average cost per warrant (in dollars per share) |  |  | $ 0.91
Total cost of public warrants repurchases | $ 0 |  |
Public warrants | Class A Common Stock |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of shares called by each warrant (in shares) | 1 |  |
Public warrants (in shares) | 0 | 0 | 2,812,764
Average cost per warrant (in dollars per share) | $ 0 | $ 0 | $ 0.91
Total cost of public warrants repurchases | $ 0 | $ 0 | $ 2,569

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- Definition Class of Warrant or Right, Repurchased During Period, Price Per Warrant + References No definition available. + Details
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Namespace Prefix: | gcm_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Class of Warrant or Right, Repurchased During Period, Shares + 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 securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |