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Description of Business - Additional Information (Detail)	Jun. 30, 2021 Property State
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of properties in portfolio | Property	1,005
Number of states in which our properties are located | State	35

X

- Definition

The number of real estate properties in the portfolio, consisting of properties owned and properties leased from third party landlords.

+ References

No definition available.

+ Details

Name:	gty_NumberOfPropertiesInPortfolio
Namespace Prefix:	gty_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of states in which the company's properties, comprised of those that are owned and those that are leased from third party landlords, are located.

+ References

No definition available.

+ Details

Name:	gty_NumberOfStatesInWhichPropertiesAreLocated
Namespace Prefix:	gty_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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