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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 14, 2014
Oct. 29, 2013
Significant Accounting Policies [Line Items]          
Federal Deposit Insurance Corporation deposit insurance limit per institution $ 250,000us-gaap_CashFDICInsuredAmount        
Restricted cash 5,206,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 1,122,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue      
Amortization expense for intangible assets 3,777,000us-gaap_AmortizationOfIntangibleAssets 490,000us-gaap_AmortizationOfIntangibleAssets 78,000us-gaap_AmortizationOfIntangibleAssets    
Amortization expense for intangible assets expected for 2015 3,251,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths        
Depreciation expense 8,742,000us-gaap_Depreciation 3,923,000us-gaap_Depreciation 3,388,000us-gaap_Depreciation    
Mortgage indebtedness, carrying value 400,509,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages 100,803,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages      
Income tax expense 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit    
Taxable income distributable to stockholders 90.00%irt_PercentageOfOrdinaryTaxableIncomeDistributedToStockholders        
Value of limited partnership units issued in acquisitions 11,940,000us-gaap_StockIssuedDuringPeriodValueAcquisitions        
Share price $ 9.31us-gaap_SharePrice     $ 8.95us-gaap_SharePrice $ 8.60us-gaap_SharePrice
Mortgages Debt          
Significant Accounting Policies [Line Items]          
Mortgage indebtedness, carrying value 400,509,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
100,803,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
     
Indebtedness fair value $ 411,311,000us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
$ 101,272,000us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
     
Maximum          
Significant Accounting Policies [Line Items]          
Cash and cash equivalents maturity period 3 months        
Building and Building Improvements          
Significant Accounting Policies [Line Items]          
Depreciable Lives 40 years        
Equipment and Fixtures | Minimum          
Significant Accounting Policies [Line Items]          
Depreciable Lives 5 years        
Equipment and Fixtures | Maximum          
Significant Accounting Policies [Line Items]          
Depreciable Lives 10 years