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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 | $ 250,000 us-gaap_CashFDICInsuredAmount |  |  |  |
Restricted cash | 5,206,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | 1,122,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |  |  |
Amortization expense for intangible assets | 3,777,000 us-gaap_AmortizationOfIntangibleAssets | 490,000 us-gaap_AmortizationOfIntangibleAssets | 78,000 us-gaap_AmortizationOfIntangibleAssets |  |
Amortization expense for intangible assets expected for 2015 | 3,251,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |  |
Depreciation expense | 8,742,000 us-gaap_Depreciation | 3,923,000 us-gaap_Depreciation | 3,388,000 us-gaap_Depreciation |  |
Mortgage indebtedness, carrying value | 400,509,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages | 100,803,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages |  |  |
Income tax expense | 0 us-gaap_IncomeTaxExpenseBenefit | 0 us-gaap_IncomeTaxExpenseBenefit | 0 us-gaap_IncomeTaxExpenseBenefit |  |
Taxable income distributable to stockholders | 90.00%irt_PercentageOfOrdinaryTaxableIncomeDistributedToStockholders |  |  |  |
Value of limited partnership units issued in acquisitions | 11,940,000 us-gaap_StockIssuedDuringPeriodValueAcquisitions |  |  |  |
Share price | $ 9.31 us-gaap_SharePrice |  |  | $ 8.95 us-gaap_SharePrice | $ 8.60 us-gaap_SharePrice
Mortgages Debt |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Mortgage indebtedness, carrying value | 400,509,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | 100,803,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |
Indebtedness fair value | $ 411,311,000 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | $ 101,272,000 us-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 |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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