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Leases - Capitol Petroleum Group - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
White Oak Petroleum Realty LLC [Member]    
Leases [Line Items]    
Number of leased properties 37gty_NumberOfLeasedProperties
/ us-gaap_LeaseArrangementTypeAxis
= gty_WhiteOakMember		  
White Oak Petroleum, LLC, Hudson Petroleum Realty, LLC, Dogwood Petroleum Realty, LLC and Big Apple Petroleum Realty, LLC [Member]    
Leases [Line Items]    
Number of unitary leases 4gty_NumberOfUnitaryLeases
/ us-gaap_LeaseArrangementTypeAxis
= gty_SubsidiariesOfCapitolPetroleumGroupLlcMember		  
White Oak Petroleum, LLC, Hudson Petroleum Realty, LLC, Dogwood Petroleum Realty, LLC and Big Apple Petroleum Realty, LLC [Member] | Gasoline Station and Convenience Store Properties [Member]    
Leases [Line Items]    
Number of leased properties included in unitary leases 97gty_NumberOfLeasedPropertiesInUnitaryWithSubsidiariesOfTenantsParent
/ us-gaap_EnergyAxis
= gty_GasolineStationAndConvenienceStorePropertiesMember
/ us-gaap_LeaseArrangementTypeAxis
= gty_SubsidiariesOfCapitolPetroleumGroupLlcMember		  
Hudson Petroleum [Member]    
Leases [Line Items]    
Number of leased properties 24gty_NumberOfLeasedProperties
/ us-gaap_LeaseArrangementTypeAxis
= gty_HudsonMember		  
Big Apple Petroleum [Member]    
Leases [Line Items]    
Number of leased properties 16gty_NumberOfLeasedProperties
/ us-gaap_LeaseArrangementTypeAxis
= gty_BigAppleMember		  
Dogwood Petroleum [Member]    
Leases [Line Items]    
Number of leased properties 20gty_NumberOfLeasedProperties
/ us-gaap_LeaseArrangementTypeAxis
= gty_DogwoodMember		  
Capitol Petroleum Group, LLC [Member]    
Leases [Line Items]    
Lease revenue percentage 16.00%gty_LeaseRevenuePercentageOfRevenue
/ us-gaap_LeaseArrangementTypeAxis
= gty_CapitolPetroleumGroupLlcMember		 16.00%gty_LeaseRevenuePercentageOfRevenue
/ us-gaap_LeaseArrangementTypeAxis
= gty_CapitolPetroleumGroupLlcMember