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Leases - Getty Petroleum Marketing Inc. - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2018 USD ($) Property Portfolio
Leases [Line Items] |
Number of leased properties subject to long-term triple-net leases | Property | 335
Number of long-term triple-net leases during the period | Portfolio | 14
Number of leased properties as single unit triple net leases | Portfolio | 28
Maximum lease commitment for capital expenditure | $ 8,112,000
Unitary triple-net lease agreements initial terms | 15 years
USTs [Member] |
Leases [Line Items] |
Asset retirement obligations removed from balance sheet | $ 13,813,000
Net asset retirement costs related to USTs removed from balance sheet | 10,808,000
Deferred rental revenue | 1,864,000
Deferred rental revenue accumulated amortization | $ 1,141,000
Maximum [Member] |
Leases [Line Items] |
Unitary triple-net lease agreements successive terms | 20 years
Getty Petroleum Marketing Inc [Member] |
Leases [Line Items] |
Number of properties previously leased | Property | 377

X
- Definition The dollar amount of the asset retirement obligations related to underground storage tanks that were removed from the balance sheet. + References No definition available. + Details
Name: | gty_AssetRetirementObligationsRemovedFromBalanceSheet
Namespace Prefix: | gty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Leases. + References No definition available. + Details
Name: | gty_LeasesLineItems
Namespace Prefix: | gty_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum dollar amount the company has committed to co-invest with tenants for capital expenditures. + References No definition available. + Details
Name: | gty_MaximumLeaseCommitmentForCapitalExpenditure
Namespace Prefix: | gty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
Name: | gty_NetAssetRetirementCostsRemoved
Namespace Prefix: | gty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of leased properties as single unit triple-net leases. + References No definition available. + Details
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Namespace Prefix: | gty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of leased properties subject to long-term triple-net leases. + References No definition available. + Details
Name: | gty_NumberOfLeasedPropertiesSubjectToLongTermTripleNetLeases
Namespace Prefix: | gty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of long-term triple-net leases in portfolios. + References No definition available. + Details
Name: | gty_NumberOfLongTermTripleNetLeasesInPortfolios
Namespace Prefix: | gty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of properties previously leased to the tenant. + References No definition available. + Details
Name: | gty_NumberOfPropertiesPreviouslyLeased
Namespace Prefix: | gty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of years in the initial term under unitary triple-net lease agreements. + References No definition available. + Details
Name: | gty_PeriodOfInitialTermUnderUnitaryTripleNetLeaseAgreements
Namespace Prefix: | gty_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of years in the successive renewal term under unitary triple-net lease agreements. + References No definition available. + Details
Name: | gty_PeriodOfSuccessiveRenewalTermsUnderUnitaryTripleNetLeaseAgreements
Namespace Prefix: | gty_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the amount of accumulated amortization as of the reporting date of deferred lease revenue which amortization represents the cumulative amount of deferred lease revenue which has been recognized in income since the amount was established. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition 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. + References 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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=gty_GettyPetroleumMarketingIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |