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Fair Value of Financial Instruments - Summary of Range of Effective Yields and Weighted Average Effective Yields of Partnership's Investments (Parenthetical) (Details) | 3 Months Ended
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Mar. 31, 2024 USD ($)
Fair Value Measurements [Abstract] |
Additional proceeds from final liquidation | $ 197,000

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- Definition Fair Value Measurements [Abstract] + References No definition available. + Details
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Period Type: | duration

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- Definition Proceeds from Final Liquidation + References No definition available. + Details
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Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration