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v3.23.3

Property Loans - Summary of Partnership's Property Loans, Allowances for Credit Losses (Parenthetical) (Details) - Senior Construction Financing [Member] | Sep. 30, 2023 | Dec. 31, 2022
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Minimum [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Floor interest rate | 0.00% | 0.00%
Maximum [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Floor interest rate | 0.50% | 0.50%

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- Definition Loan financing floor interest rate. + References No definition available. + Details
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Namespace Prefix: | ghi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=ghi_SeniorConstructionFinancingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |