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General - Schedule of Earnings (Loss) from Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]    
Revenues from rental properties $ 114us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue $ 905us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Impairment charges (1,185)gty_DisposalGroupIncludingDiscontinuedOperationAssetImpairmentCharges (1,495)gty_DisposalGroupIncludingDiscontinuedOperationAssetImpairmentCharges
Other operating expenses (96)gty_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense (617)gty_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense
Loss from operating activities (1,167)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax (1,207)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Gains on dispositions of real estate 92us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 3,153us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
(Loss) earnings from discontinued operations $ (1,075)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 1,946us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax