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v3.25.1

Transactions with Related Parties - Summary of Transactions Between Borrowers of Partnership's MRBs and Affiliates (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
General Partner [Member] |  |  |
Investment/mortgage placement fees earned | [1] | $ 164,000 | $ 25,000
[1] | The General Partner received placement fees in connection with the acquisition of certain MRBs, taxable MRBs, GILs, taxable GILs and property loans and investments in unconsolidated entities.

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- Definition Investment/mortgage placement fees earned. + References No definition available. + Details
Name: | ghi_InvestmentMortgagePlacementFeesEarned
Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_GeneralPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |