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Summary of Information Concerning Indebtedness that Encumbered our Properties (Parenthetical) (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Belle Creek Apartments | Floating Rate
Mortgage Loans on Real Estate [Line Items]
Debt instrument interest rate	2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_BelleCreekApartmentsMember / us-gaap_VariableRateAxis = irt_FloatingRateMember	2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_BelleCreekApartmentsMember / us-gaap_VariableRateAxis = irt_FloatingRateMember
Belle Creek Apartments | 30-Day LIBOR
Mortgage Loans on Real Estate [Line Items]
Debt instrument interest rate	0.18%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_BelleCreekApartmentsMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember	0.17%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_BelleCreekApartmentsMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
Berkshire Square Apartments
Mortgage Loans on Real Estate [Line Items]
Interest payment period	Monthly	Monthly
Principal date	Feb. 01, 2016	Feb. 01, 2016
Amortization schedule	30 years	30 years
Centrepoint Apartments
Mortgage Loans on Real Estate [Line Items]
Interest payment period	Monthly	Monthly
Principal date	Feb. 01, 2015	Feb. 01, 2015
Amortization schedule	30 years	30 years
Tresa At Arrowhead | Floating Rate
Mortgage Loans on Real Estate [Line Items]
Debt instrument interest rate	2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_TresaAtArrowheadMember / us-gaap_VariableRateAxis = irt_FloatingRateMember	2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_TresaAtArrowheadMember / us-gaap_VariableRateAxis = irt_FloatingRateMember
Tresa At Arrowhead | 30-Day LIBOR
Mortgage Loans on Real Estate [Line Items]
Debt instrument interest rate	0.18%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_TresaAtArrowheadMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember	0.17%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_TresaAtArrowheadMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
OKC Portfolio
Mortgage Loans on Real Estate [Line Items]
Amortization schedule	30 years	30 years
Contractual interest rate	5.60%irt_FixedInterestRateBearingOnMinimumPercentageOfAggregateOutstandingDebt / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_OKCPortfolioMember	5.60%irt_FixedInterestRateBearingOnMinimumPercentageOfAggregateOutstandingDebt / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_OKCPortfolioMember
King's Landing
Mortgage Loans on Real Estate [Line Items]
Interest payment period	Monthly	Monthly
Principal date	Jun. 01, 2017	Jun. 01, 2017
Amortization schedule	30 years	30 years
Secured Credit Facility | Floating Rate
Mortgage Loans on Real Estate [Line Items]
Debt instrument interest rate	2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = irt_SecuredCreditFacilityMember / us-gaap_VariableRateAxis = irt_FloatingRateMember	2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = irt_SecuredCreditFacilityMember / us-gaap_VariableRateAxis = irt_FloatingRateMember
Secured Credit Facility | 30-Day LIBOR
Mortgage Loans on Real Estate [Line Items]
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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