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Leases - Chestnut Petroleum Dist. Inc. - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 12 Months Ended
Jun. 30, 2013
Operator
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 31, 2013
Property
Leases [Line Items]          
Number of locations (operators) involved in the proceedings 24gty_NumberOfFormerSubtenantsForWhichThereAreOngoingEvictionProceedings        
Number of former operators have withdrawn their appeals 16gty_NumberOfFormerSubtenantsWhoHaveWithdrawnAppeal        
Number of operators remain in the site during their court appeal 8gty_NumberOfFormerSubtenantsPendingAppeal        
Bad debt reserve, total   $ 4,160us-gaap_AllowanceForDoubtfulAccountsReceivable $ 3,248us-gaap_AllowanceForDoubtfulAccountsReceivable    
Non-cash allowances for deferred rental receivable   3,407gty_AllowanceForDeferredRentReceivable (10,952)gty_AllowanceForDeferredRentReceivable 11,950gty_AllowanceForDeferredRentReceivable  
Reserved deferred rent receivable   6,315gty_DeferredRentReceivablesFullyReserved      
CPD NY and NECG [Member]          
Leases [Line Items]          
Number of leased properties   118gty_NumberOfLeasedProperties
/ us-gaap_LeaseArrangementTypeAxis
= gty_SubsidiariesOfChestnutPetroleumDistIncMember		      
Number of unitary leases   2gty_NumberOfUnitaryLeases
/ us-gaap_LeaseArrangementTypeAxis
= gty_SubsidiariesOfChestnutPetroleumDistIncMember		      
Lease revenue percentage   19.00%gty_LeaseRevenuePercentageOfRevenue
/ us-gaap_LeaseArrangementTypeAxis
= gty_SubsidiariesOfChestnutPetroleumDistIncMember		 21.00%gty_LeaseRevenuePercentageOfRevenue
/ us-gaap_LeaseArrangementTypeAxis
= gty_SubsidiariesOfChestnutPetroleumDistIncMember		 18.00%gty_LeaseRevenuePercentageOfRevenue
/ us-gaap_LeaseArrangementTypeAxis
= gty_SubsidiariesOfChestnutPetroleumDistIncMember		  
CPD NY [Member]          
Leases [Line Items]          
Number of leased properties   58gty_NumberOfLeasedProperties
/ us-gaap_LeaseArrangementTypeAxis
= gty_CpdNyMember		      
NECG Holdings Corp [Member]          
Leases [Line Items]          
Number of leased properties   60gty_NumberOfLeasedProperties
/ us-gaap_LeaseArrangementTypeAxis
= gty_NecgHoldingsCorpMember		      
Number of Lease properties removed   24gty_NumberOfLeasedPropertiesRemoved
/ us-gaap_LeaseArrangementTypeAxis
= gty_NecgHoldingsCorpMember		      
Number of Lease Properties         84gty_NumberOfPropertiesPreviouslyLeased
/ us-gaap_LeaseArrangementTypeAxis
= gty_NecgHoldingsCorpMember
Bad debt reserve, total   1,704us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_LeaseArrangementTypeAxis
= gty_NecgHoldingsCorpMember		      
Non-cash allowances for deferred rental receivable   $ 1,540gty_AllowanceForDeferredRentReceivable
/ us-gaap_LeaseArrangementTypeAxis
= gty_NecgHoldingsCorpMember