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Leases - Marketing and the Master Lease - Additional Information (Detail) (USD $)
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Apr. 22, 2015
Getty Petroleum Marketing [Member]    
Leases [Line Items]    
Number of properties previously leased to GPMI 480gty_NumberOfPropertiesPreviouslyLeased
/ dei_LegalEntityAxis
= gty_GettyPetroleumMarketingMember		  
Marketing Estate Liquidating Trustee [Member] | Settlement Agreement [Member]    
Leases [Line Items]    
Settlement agreement hearing date Apr. 22, 2015  
Marketing Estate Liquidating Trustee [Member] | Subsequent Event [Member] | Settlement Agreement [Member]    
Leases [Line Items]    
Interim distribution amount   $ 6,800,000gty_InterimDistributionAmountOfGeneralUnsecuredClaimsBankruptcySettlementAgreement
/ us-gaap_CounterpartyNameAxis
= gty_MarketingEstateLiquidatingTrusteeMember
/ us-gaap_LitigationStatusAxis
= gty_SettlementAgreementMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Additional distribution amount   $ 550,000gty_AdditionalDistributionAmountOfGeneralUnsecuredClaimsBankruptcySettlementAgreement
/ us-gaap_CounterpartyNameAxis
= gty_MarketingEstateLiquidatingTrusteeMember
/ us-gaap_LitigationStatusAxis
= gty_SettlementAgreementMember
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= us-gaap_SubsequentEventMember