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Summary of Information Concerning Indebtedness that Encumbered our Properties (Parenthetical) (Detail) | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended
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Sep. 30, 2014 Belle Creek Apartments | Dec. 31, 2013 Belle Creek Apartments | Sep. 30, 2014 Tresa At Arrowhead | Dec. 31, 2013 Tresa At Arrowhead | Sep. 30, 2014 Centrepoint Apartments | Sep. 30, 2014 Berkshire Square Apartments | Mar. 31, 2014 King's Landing | Sep. 30, 2014 King's Landing | Sep. 30, 2014 Secured Credit Facility | Dec. 31, 2013 Secured Credit Facility | Sep. 30, 2014 OKC Portfolio
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Floating rate | 2.25% | 2.25% | 2.25% | 2.25% |  |  |  |  | 2.50% | 2.75% |
30-day LIBOR rate | 0.15% | 0.17% | 0.15% | 0.17% |  |  |  |  | 0.15% | 0.17% |
Debt number of days of LIBOR against interest rate basis | 30 days | 30 days | 30 days | 30 days |  |  |  |  | 30 days | 30 days |
Interest payment period |  |  |  |  | Monthly | Monthly | Monthly | Monthly |  |  |
Principal date |  |  |  |  | Feb. 01, 2015 | Feb. 01, 2016 | Jun. 01, 2017 | Jun. 01, 2017 |  |  |
Amortization schedule |  |  |  |  | 30 years | 30 years | 30 years | 30 years |  |  | 30 years
Contractual interest rate |  |  |  |  |  |  |  |  |  |  | 5.60%

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- Definition Date the debt agreement requires a change in payment type from interest only to principal and interest. + References No definition available. + Details
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- Definition Debt number of days of LIBOR against interest rate basis. + References No definition available. + Details
Name: | irt_DebtPeriodOfLIBORAgainstInterestRateBasis
Namespace Prefix: | irt_
Data Type: | xbrli:durationItemType
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- Definition Fixed Interest Rate Bearing On Minimum Percentage Of Aggregate Outstanding Debt + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Frequency of periodic payment for mortgage loans on real. + References No definition available. + Details
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- Definition The 30-day LIBOR rate as of period end used for floating rate instruments. + References No definition available. + Details
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- Definition Mortgage loans on real estate period of amortization schedule. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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