XML 68 R61.htm IDEA: XBRL DOCUMENT
v3.24.3

Property Acquisitions - Additional Information (Detail) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) Property | Sep. 30, 2023 USD ($) Property | Dec. 31, 2023 USD ($) Property
Business Acquisition [Line Items] |  |  |
Number of real estate properties, fee simple | Property | 52 | 37 |
Aggregate purchase price of properties acquired during the period | $ 204,488 | $ 192,988 |
Number of property whose construction is completed | Property | 11 |  |
Number Of property whose construction is completed in current quarter | Property | 10 |  |
Finance receivables | $ 55,100 |  |
Ten Properties [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finance receivables | 51,300 |  |
Accounting Standards Update 2016-13 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price of properties acquired during the period | $ 12,100 |  |
Express Tunnel Car Washes Under Construction [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of real estate properties, fee simple | Property | 15 | 13 | 15
Aggregate purchase price of properties acquired during the period |  | $ 40,000 | $ 45,800
Additional payments to acquire properties | $ 27,900 | 4,200 |
Express Tunnel Car Washes Under Construction [Member] | Accounting Standards Update 2016-13 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price of properties acquired during the period | $ 73,700 | $ 44,200 |

X
- Definition Additional payments to acquire commercial real estate. + References No definition available. + Details
Name: | gty_AdditionalPaymentsToAcquireCommercialRealEstate
Namespace Prefix: | gty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of property whose construction is completed. + References No definition available. + Details
Name: | gty_NumberOfPropertyWhoseConstructionIsCompleted
Namespace Prefix: | gty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of property whose construction is completed in current quarter. + References No definition available. + Details
Name: | gty_NumberOfPropertyWhoseConstructionIsCompletedInCurrentQuarter
Namespace Prefix: | gty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-5 + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(5)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 Reference 4: 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)(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of real estate properties owned as of the statement of financial position to which the entity has fee simple title. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstatePropertiesFeeSimple
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow from the acquisition of property as primarily intended to generate income for its owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
Name: | us-gaap_PaymentsToAcquireCommercialRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=gty_TenPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201613Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=gty_ExpressTunnelCarWashesUnderConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |