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Leases - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
State
Property
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
State
Property
Dec. 31, 2013
Dec. 31, 2012
Leases [Line Items]                      
Number of properties in portfolio 863gty_NumberOfPropertiesInPortfolio               863gty_NumberOfPropertiesInPortfolio    
Number of states in which our properties are located 19gty_NumberOfStatesInWhichPropertiesAreLocated               19gty_NumberOfStatesInWhichPropertiesAreLocated    
Revenues from rental properties included in continuing operations $ 24,543,000us-gaap_RealEstateRevenueNet $ 24,072,000us-gaap_RealEstateRevenueNet $ 24,350,000us-gaap_RealEstateRevenueNet $ 23,757,000us-gaap_RealEstateRevenueNet $ 25,589,000us-gaap_RealEstateRevenueNet $ 28,067,000us-gaap_RealEstateRevenueNet $ 23,309,000us-gaap_RealEstateRevenueNet $ 22,430,000us-gaap_RealEstateRevenueNet $ 96,722,000us-gaap_RealEstateRevenueNet $ 96,269,000us-gaap_RealEstateRevenueNet $ 93,204,000us-gaap_RealEstateRevenueNet
Rental property expenses included in continuing operations                 77,695,000gty_RealEstateTaxesAndOtherMunicipalChargesPaidThenReimbursedByTenants 72,964,000gty_RealEstateTaxesAndOtherMunicipalChargesPaidThenReimbursedByTenants 77,904,000gty_RealEstateTaxesAndOtherMunicipalChargesPaidThenReimbursedByTenants
Revenues from rental properties                 13,777,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue 15,405,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue 10,867,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Other revenue                   3,126,000us-gaap_LitigationSettlementAmount  
Net loss realized under interim fuel supply agreements                   1,374,000gty_InterimFuelSupplyAgreementsNetLoss  
Net gain realized under interim fuel supply agreements                     1,763,000gty_InterimFuelSupplyAgreementsNetGain
Revenues due or received from Marketing under the Master Lease                     17,004,000,000gty_RevenuesDueOrReceivedFromMarketingUnderMasterLease
Rental revenue increase due to revenue recognition adjustments included in continuing operations                 5,251,000gty_RealEstateRevenueRecognitionAdjustments 7,900,000gty_RealEstateRevenueRecognitionAdjustments 4,433,000gty_RealEstateRevenueRecognitionAdjustments
Investment in direct financing lease 95,764,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases       97,147,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases       95,764,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases 97,147,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases  
Investments in direct financing lease, minimum lease payments receivable 191,491,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived       203,438,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived       191,491,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived 203,438,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived  
Investment in direct financing lease, unguaranteed estimated residual value 13,979,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesUnguaranteedResidualValuesOfLeasedProperty       13,979,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesUnguaranteedResidualValuesOfLeasedProperty       13,979,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesUnguaranteedResidualValuesOfLeasedProperty 13,979,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesUnguaranteedResidualValuesOfLeasedProperty  
Investment in direct financing lease, deferred income 109,706,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesDeferredIncome       120,270,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesDeferredIncome       109,706,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesDeferredIncome 120,270,000us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesDeferredIncome  
Remaining lease term                 10 years    
2015 6,648,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent               6,648,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 5,869,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears               5,869,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 4,526,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears               4,526,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 3,497,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears               3,497,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 2,385,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears               2,385,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 5,080,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter               5,080,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Rent expense on operating lease                 6,088,000gty_RentalExpenseOnOperatingLeases 7,092,000gty_RentalExpenseOnOperatingLeases 7,903,000gty_RentalExpenseOnOperatingLeases
Rent received under sublease                 10,358,000us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue 10,715,000us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue 11,809,000us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue
Third Parties [Member]                      
Leases [Line Items]                      
Number of properties previously leased 106gty_NumberOfPropertiesLeasedFromLandlords
/ us-gaap_CounterpartyNameAxis
= gty_ThirdPartiesMember		               106gty_NumberOfPropertiesLeasedFromLandlords
/ us-gaap_CounterpartyNameAxis
= gty_ThirdPartiesMember		    
Judicial Ruling [Member]                      
Leases [Line Items]                      
Other revenue                   $ 3,126,000us-gaap_LitigationSettlementAmount
/ us-gaap_LitigationStatusAxis
= us-gaap_JudicialRulingMember		  
Owned Properties [Member]                      
Leases [Line Items]                      
Number of properties 757us-gaap_NumberOfRealEstateProperties
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_WhollyOwnedPropertiesMember		               757us-gaap_NumberOfRealEstateProperties
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_WhollyOwnedPropertiesMember