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Leases - Hanuman Business, Inc. - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases [Line Items]      
Non-cash allowances for deferred rental receivable $ 3,407gty_AllowanceForDeferredRentReceivable $ (10,952)gty_AllowanceForDeferredRentReceivable $ 11,950gty_AllowanceForDeferredRentReceivable
Ramoco Lease [Member]      
Leases [Line Items]      
Number of properties in portfolio 61gty_NumberOfLeasedProperties
/ us-gaap_LeaseArrangementTypeAxis
= gty_RamocoLeaseMember		    
Non-cash allowances for deferred rental receivable $ 694gty_AllowanceForDeferredRentReceivable
/ us-gaap_LeaseArrangementTypeAxis
= gty_RamocoLeaseMember