Name:	gty_AssetRetirementObligationsRemovedFromBalanceSheet
Namespace Prefix:	gty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of the distributions received as a result of the settlement of unsecured clams and settlement of the litigation funding agreement dispute.

No definition available.

Name:	gty_DistributionsReceivedFromSettlementOfClaims
Namespace Prefix:	gty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Leases.

No definition available.

Name:	gty_LeasesLineItems
Namespace Prefix:	gty_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The maximum dollar amount the company has committed to co-invest with tenants for capital expenditures.

No definition available.

Name:	gty_MaximumLeaseCommitmentForCapitalExpenditure
Namespace Prefix:	gty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of net asset retirement costs related to underground storage tanks removed from the balance sheet in conjunction with a transfer of related obligations to the lessee.

No definition available.

Name:	gty_NetAssetRetirementCostsRemoved
Namespace Prefix:	gty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Number of leased properties as single unit triple-net leases.

No definition available.

Name:	gty_NumberOfLeasedPropertiesAsSingleUnitTripleNetLeases
Namespace Prefix:	gty_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of leased properties with new tenants.

No definition available.

Name:	gty_NumberOfLeasedPropertiesWithNewTenants
Namespace Prefix:	gty_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of new triple-net leases entered into with petroleum distributors.

No definition available.

Name:	gty_NumberOfNewTripleNetLeasesEnteredInto
Namespace Prefix:	gty_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of properties previously leased to the tenant.

No definition available.

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

The number of years in the initial term under unitary triple-net lease agreements.

No definition available.

Name:	gty_PeriodOfInitialTermUnderUnitaryTripleNetLeaseAgreements
Namespace Prefix:	gty_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The number of years in the successive renewal term under unitary triple-net lease agreements.

No definition available.

Name:	gty_PeriodOfSuccessiveRenewalTermsUnderUnitaryTripleNetLeaseAgreements
Namespace Prefix:	gty_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

This element represents revenue received, but not recognized for financial reporting purposes. Such deferred revenue may consist of and include amounts paid in advance by lessees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84165051&loc=d3e45377-112738

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

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=gty_UndergroundStorageTanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=gty_GettyPetroleumMarketingIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_CounterpartyNameAxis=gty_MarketingEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: