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v3.23.3

Transactions with Related Parties - Summary of Transactions Between Borrowers of Partnership's MRBs and Affiliates (Parenthetical) (Details) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Related Party Transactions [Abstract] |  |  |  |
Rate for administration fees receivable | 0.45% | 0.45% | 0.45% | 0.45%

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- Definition Rate for administration fees - rate charged on the bonds and loans collateralized by the underlying properties for administration of the assets + References No definition available. + Details
Name: | ghi_RateForAdministrationFees
Namespace Prefix: | ghi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration