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Lessor Operating Leases - Additional Information (Details) $ in Millions	6 Months Ended
	Dec. 31, 2020 USD ($) Property
Gartner I and Gartner II
Lessor Lease Description [Line Items]
Number of office buildings | Property	2
Lessor, lease option to extend	The Gartner I lease contains two five-year extensions and the Gartner II lease contains three five-year extensions
Existence of option to extend operating lease	true
Lessor, lease renewal rate	95.00%
Monthly base lease payments | $	$ 0.4
Minimum
Lessor Lease Description [Line Items]
Lessor, lease terms	10 months
Maximum
Lessor Lease Description [Line Items]
Lessor, lease terms	36 months

X

- Definition

Lessor operating lease renewal rate.

+ References

No definition available.

+ Details

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

X

- Definition

Operating lease, lease income, monthly lease payments.

+ References

No definition available.

+ Details

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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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X

- Definition

Indicates (true false) whether lessor has option to extend operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919359-209981

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X

- Definition

Description of terms and conditions of option to extend lessor's operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919359-209981

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X

- Definition

Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919359-209981

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X

- Definition

The number of real estate properties owned as of the statement of financial position to which the entity has fee simple title.

+ References

No definition available.

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