Asset acquisition contingent consideration liability measurement input.

No definition available.

Name:	geg_AssetAcquisitionContingentConsiderationLiabilityMeasurementInput
Namespace Prefix:	geg_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value asset level 1 to level 2 transfers amount.

+ References

No definition available.

+ Details

Name:	geg_FairValueAssetsLevel1ToLevel2TransferAmount
Namespace Prefix:	geg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value assets level 2 to level 1 transfer amount.

+ References

No definition available.

+ Details

Name:	geg_FairValueAssetsLevel2ToLevel1TransferAmount
Namespace Prefix:	geg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value investment, capped percentage of net asset value.

+ References

No definition available.

+ Details

Name:	geg_FairValueInvestmentCappedPercentageOfNetAssetValue
Namespace Prefix:	geg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value liabilities level 1 to level 2 transfer amount.

+ References

No definition available.

+ Details

Name:	geg_FairValueLiabilitiesLevel1ToLevel2TransferAmount
Namespace Prefix:	geg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value liabilities level 2 to level 1 transfers amount

+ References

No definition available.

+ Details

Name:	geg_FairValueLiabilitiesLevel2ToLevel1TransferAmount
Namespace Prefix:	geg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Lockup period from date of investment.

+ References

No definition available.

+ Details

Name:	geg_LockupPeriodFromDateOfInvestment
Namespace Prefix:	geg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Notice period for annually allowable redemptions.

+ References

No definition available.

+ Details

Name:	geg_NoticePeriodForAnnuallyAllowableRedemptions
Namespace Prefix:	geg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of contingent consideration recognized as part of consideration transferred in asset acquisition.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480060/805-50-25-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 30
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480027/805-50-30-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 30
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480027/805-50-30-2

+ Details

Name:	us-gaap_AssetAcquisitionConsiderationTransferredContingentConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479581/805-30-50-1

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479581/805-30-50-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479668/805-30-25-6

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 35
-Paragraph 1
-Subparagraph (b)
-SubTopic 30
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479613/805-30-35-1

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

+ References

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

+ References

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fair value of financial and nonfinancial obligations.

+ References

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_AssetAcquisitionAxis=geg_InvestmentManagementAgreementAndCertainOtherAssetsForMonomoyPropertiesReitLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_IncomeApproachValuationTechniqueMember
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Data Type:	na
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- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
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Balance Type:
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- Details

Name:	us-gaap_BusinessAcquisitionAxis=geg_MonomoyPropertiesReitLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=geg_ImperialCapitalAssetManagementLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	srt_ConsolidatedEntitiesAxis=geg_ConsolidatedFundMember
Namespace Prefix:
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- Details

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Fair Value Measurements - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023	May 04, 2022
Fair value assets level 1 to level 2 transfers		$ 0	$ 0	$ 0	$ 0
Fair value assets level 2 to level 1 transfers		0	0	0	0
Fair value asset transfers into level 3		0	0
Fair value asset transfers out of level 3				0	0
Fair value liabilities level 1 to level 2 transfers		0	0	0	0
Fair value liabilities level 2 to level 1 transfers		0	0	0	0
Fair value liability transfers into level 3		0	0	0	0
Fair value liability transfers out of level 3		$ 0	$ 0	$ 0	$ 0
Notice period for annually allowable redemptions				90 days		90 days
Capped percentage of net asset value		5.00%		5.00%		5.00%
Lockup period from date of investment				1 year		1 year
Assets measured at fair value		$ 39,312,000		$ 39,312,000		$ 32,611,000
Liabilities measured at fair value		$ 962,000		962,000		1,903,000
Investment Management Agreement and Certain Other Assets for Monomoy Properties REIT L.L.C.
Asset acquisition, contingent consideration	$ 1,000,000			$ 1,000,000
Investment Management Agreement and Certain Other Assets for Monomoy Properties REIT L.L.C. \| Income Approach \| Discount Rate
Measurement input		0.08		0.08
Monomoy Properties REIT, LLC
Maximum additional consideration payable							$ 2,000,000
Imperial Capital, LLC
Contingent consideration liability						1,900,000
Consolidated Funds
Fair value assets level 1 to level 2 transfers		$ 0		$ 0
Fair value assets level 2 to level 1 transfers		0		0
Fair value asset transfers into level 3		0		0
Fair value asset transfers out of level 3		0		0
Fair value liabilities level 1 to level 2 transfers		0		0
Fair value liabilities level 2 to level 1 transfers		0		0
Fair value liability transfers into level 3		0		0
Fair value liability transfers out of level 3		$ 0		$ 0
Consolidated Funds \| Fair Value, Recurring Basis
Assets measured at fair value						0
Liabilities measured at fair value						$ 0