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Segments - Additional Information (Details) | 9 Months Ended
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Sep. 30, 2023 Property Unit Security Segment Bed
Segment Reporting Information [Line Items] |
Number of Reportable Segments | Segment | 4
Affordable Multifamily Mortgage Revenue Bond Investments Segment [Member] |
Segment Reporting Information [Line Items] |
Number of Available for Sale Securities | Security | 82
Number of available for sale securities in tax-exempt loan | Security | 10
Number of Real Estate Properties | Property | 2
Seniors and Skilled Nursing Mortgage Revenue Bond Investments Segment [Member] |
Segment Reporting Information [Line Items] |
Number of rental units financed by mortgage revenue bonds | Bed | 294
MF Properties Segment [Member] |
Segment Reporting Information [Line Items] |
Number of Real Estate Properties | Property | 1
Number of rental units under MF properties segment | Unit | 384
Residential Properties [Member] | Affordable Multifamily Mortgage Revenue Bond Investments Segment [Member] |
Segment Reporting Information [Line Items] |
Number of rental units financed by mortgage revenue bonds | Unit | 11,325
Number of rental units financed by tax-exempt loan | Unit | 1,927
Commercial Real Estate [Member] | Affordable Multifamily Mortgage Revenue Bond Investments Segment [Member] |
Segment Reporting Information [Line Items] |
Number of collateralized securities | Security | 1

X
- Definition Number of Available for Sale Securities + References No definition available. + Details
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Period Type: | duration

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- Definition Number of available for sale securities in tax-exempt loan. + References No definition available. + Details
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Namespace Prefix: | ghi_
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X
- Definition Number of collateralized securities. + References No definition available. + Details
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X
- Definition Number of rental units financed by mortgage revenue bonds. + References No definition available. + Details
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X
- Definition Number of rental units financed by tax-exempt loan. + References No definition available. + Details
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X
- Definition Number of rental units under MF properties segment. + References No definition available. + Details
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X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + 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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- Details
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- Details
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- Details
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- Details
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- Details
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