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Leases - Hanuman Business, Inc. - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Portfolios
Leases [Line Items]  
Reserved deferred rent receivable $ 6,265gty_DeferredRentReceivablesFullyReserved
Ramoco Lease [Member]  
Leases [Line Items]  
Number of leased properties 61gty_NumberOfLeasedProperties
/ us-gaap_LeaseArrangementTypeAxis
= gty_RamocoLeaseMember
Reserved deferred rent receivable $ 754gty_DeferredRentReceivablesFullyReserved
/ us-gaap_LeaseArrangementTypeAxis
= gty_RamocoLeaseMember