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Related Party Transactions and Arrangements - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 12 Months Ended
May 07, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 07, 2013
Property
Related Party Transaction [Line Items]          
Quarterly management fee as percentage of average real estate assets 0.1875%irt_ManagementFeeBasesPerAnnum        
Quarterly management fee payment rate as percentage of average real estate assets 0.1875%irt_PercentageOfManagementFee        
Asset management fees earned   $ 1,582us-gaap_AssetManagementFees1 $ 128us-gaap_AssetManagementFees1 $ 240us-gaap_AssetManagementFees1  
Number of properties excluded from computation of base management fee 8irt_NumberOfProperties       8irt_NumberOfProperties
Incentive fees incurred to advisor   154us-gaap_IncentiveFeeExpense 144us-gaap_IncentiveFeeExpense 0us-gaap_IncentiveFeeExpense  
Percentage of gross revenues from the property     4.00%irt_PropertyManagementAndLeasingFeesPercentageOfGrossRevenuesFromProperty    
Property management and leasing fees   1,759irt_PaymentOfPropertyManagementAndLeasingFeesToPropertyManager 785irt_PaymentOfPropertyManagementAndLeasingFeesToPropertyManager 655irt_PaymentOfPropertyManagementAndLeasingFeesToPropertyManager  
Incentive Fees          
Related Party Transaction [Line Items]          
Incentive fees payable to advisor   644us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
/ irt_ExpenseTypeAxis
= irt_IncentiveFeesMember		 107us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
/ irt_ExpenseTypeAxis
= irt_IncentiveFeesMember		    
Other Liabilities          
Related Party Transaction [Line Items]          
Property management and leasing fees payable   $ 205irt_ManagementAndLeaseFeePayable
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember		 $ 83irt_ManagementAndLeaseFeePayable
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember		    
if pre-incentive fee Core FFO does not exceed hurdle rate          
Related Party Transaction [Line Items]          
Advisor incentive fee 0.00%irt_AdvisoryFeePercentage
/ us-gaap_StatementScenarioAxis
= irt_ScenarioThreeMember		       0.00%irt_AdvisoryFeePercentage
/ us-gaap_StatementScenarioAxis
= irt_ScenarioThreeMember
if pre-incentive fee Core FFO does not exceed hurdle rate | Maximum          
Related Party Transaction [Line Items]          
Cumulative gross amount of equity capital, hurdle rate 1.75%irt_InternalRateOfReturn
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= irt_ScenarioThreeMember		        
Cumulative gross amount of equity capital, annual hurdle rate 7.00%irt_AnnualRateOfReturn
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= irt_ScenarioThreeMember		        
if pre-incentive fee Core FFO exceeds hurdle rate          
Related Party Transaction [Line Items]          
Advisor incentive fee 20.00%irt_AdvisoryFeePercentage
/ us-gaap_StatementScenarioAxis
= irt_ScenarioFourMember		       20.00%irt_AdvisoryFeePercentage
/ us-gaap_StatementScenarioAxis
= irt_ScenarioFourMember
if pre-incentive fee Core FFO exceeds hurdle rate | Minimum          
Related Party Transaction [Line Items]          
Cumulative gross amount of equity capital, hurdle rate 1.75%irt_InternalRateOfReturn
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= irt_ScenarioFourMember		        
Cumulative gross amount of equity capital, annual hurdle rate 7.00%irt_AnnualRateOfReturn
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= irt_ScenarioFourMember