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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

X

- 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

X

- Definition

Class of Warrant or Right, Repurchased During Period, Shares

+ References

No definition available.

+ Details

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Namespace Prefix:	gcm_
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Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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