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Commitments and Contingencies - Summary of Partnership's Maximum Exposure Under Guaranty Agreements (Details)	12 Months Ended
	Dec. 31, 2024 USD ($)
Vantage at McKinney Falls [Member]
Long-term Purchase Commitment [Line Items]
Guarantee Maturity	2026
Maximum Balance Available on Loan	$ 35,850,000
Loan Balance as of December 31, 2024	35,850,000
Partnership's Maximum Exposure as of December 31, 2024	17,925,000
Ohio Properties [Member]
Long-term Purchase Commitment [Line Items]
Partnership's Maximum Exposure as of December 31, 2024	$ 1,609,695
End of Guaranty Period	2026
Greens of Pine Glen [Member]
Long-term Purchase Commitment [Line Items]
Partnership's Maximum Exposure as of December 31, 2024	$ 1,278,767
End of Guaranty Period	2027

X

- Definition

Construction loan amount outstanding.

+ References

No definition available.

+ Details

Name:	ghi_ConstructionLoanAmountOutstanding
Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Construction loan maximum available amount.

+ References

No definition available.

+ Details

Name:	ghi_ConstructionLoanMaximumAvailableAmount
Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Guarantees expiration year.

+ References

No definition available.

+ Details

Name:	ghi_GuaranteesExpirationYear
Namespace Prefix:	ghi_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Year Of Guarantee Agreement Term Ending .

+ References

No definition available.

+ Details

Name:	ghi_YearOfGuaranteeAgreementTermEnding
Namespace Prefix:	ghi_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

+ Details

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

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

X

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_VantageAtMckinneyFallsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_OhioPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_GreensOfPineGlenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: