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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 31, 2015
Income Tax [Line Items]        
Net cash paid for income taxes $ 316us-gaap_IncomeTaxesPaidNet $ 173us-gaap_IncomeTaxesPaidNet $ 810us-gaap_IncomeTaxesPaidNet  
Percentage of ordinary income 43.90%gty_FederalTaxAttributesOfCommonStockDividendsAsPercentageOfEarningsAndProfitsForOrdinaryIncome 94.40%gty_FederalTaxAttributesOfCommonStockDividendsAsPercentageOfEarningsAndProfitsForOrdinaryIncome 10.00%gty_FederalTaxAttributesOfCommonStockDividendsAsPercentageOfEarningsAndProfitsForOrdinaryIncome  
Capital gain distributions percentage 56.10%gty_FederalTaxAttributesOfCommonStockDividendsAsPercentageOfEarningsAndProfitsForCapitalGainsDistributions 5.60%gty_FederalTaxAttributesOfCommonStockDividendsAsPercentageOfEarningsAndProfitsForCapitalGainsDistributions 61.30%gty_FederalTaxAttributesOfCommonStockDividendsAsPercentageOfEarningsAndProfitsForCapitalGainsDistributions  
Non-taxable distributions percentage 0.00%gty_FederalTaxAttributesOfCommonStockDividendsAsPercentageOfEarningsAndProfitsForNonTaxableIncome 0.00%gty_FederalTaxAttributesOfCommonStockDividendsAsPercentageOfEarningsAndProfitsForNonTaxableIncome 28.70%gty_FederalTaxAttributesOfCommonStockDividendsAsPercentageOfEarningsAndProfitsForNonTaxableIncome  
Percentage of taxable income distributed among stockholders 90.00%gty_PercentageOfOrdinaryTaxableIncomeToShareholders      
Percentage of common stock to total required distribution 80.00%gty_PercentageOfCommonStockToRequiredDistribution      
Subsequent Event [Member]        
Income Tax [Line Items]        
Percentage of common stock to total required distribution       80.00%gty_PercentageOfCommonStockToRequiredDistribution
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