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Assets Held For Sale - Summary of Real Estate Held for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Summary Of Real Estate Held For Sale [Line Items]
Real estate held for sale at cost	$ 5,862	$ 5,755
Accumulated depreciation and amortization	(3,253)	(3,326)
Real estate held for sale, net	2,609	2,429
Land [Member]
Summary Of Real Estate Held For Sale [Line Items]
Real estate held for sale at cost	2,283	2,235
Buildings and Improvements [Member]
Summary Of Real Estate Held For Sale [Line Items]
Real estate held for sale at cost	$ 3,579	$ 3,520

X

- Definition

Real estate held for sale property, accumulated depreciation and amortization.

+ References

No definition available.

+ Details

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X

- Definition

Real estate held for sale property, at cost.

+ References

No definition available.

+ Details

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Namespace Prefix:	gty_
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X

- Definition

Summary of real estate held for sale.

+ References

No definition available.

+ Details

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- Definition

Amount of investment in land and building held for sale. Excludes real estate considered inventory.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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- Details

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