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Regulatory and Net Capital Requirements (Details) - GRV Securities LLC $ in Millions	Dec. 31, 2025 USD ($)
Regulatory Assets [Line Items]
Net capital	$ 0.7
Excess net capital	$ 0.7
Aggregate indebtedness ratio	0.21

X

- Definition

Broker-Dealer, Aggregate Indebtedness Ratio

+ References

No definition available.

+ Details

Name:	gcm_BrokerDealerAggregateIndebtednessRatio
Namespace Prefix:	gcm_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of net capital in excess of minimum required net capital, calculated under Aggregate Indebtedness Standard.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Rule 15c3-1
-Number 240
-Section 15c3-1
-Publisher SEC

+ Details

Name:	srt_ExcessNetCapitalAt1500Percent
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of net capital of broker-dealer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Rule 15c3-1
-Number 240
-Section 15c3-1
-Publisher SEC

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

Name:	us-gaap_RegulatoryAssetLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=gcm_GRVSecuritiesLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: