Summary of Information Concerning Indebtedness that Encumbered our Properties (Parenthetical) (Detail)	3 Months Ended	12 Months Ended
Mar. 31, 2014	Dec. 31, 2013
OKC Portfolio
Mortgage Loans on Real Estate [Line Items]
Amortization schedule	30 years
Interest payment period	5.60%
Secured Credit Facility
Mortgage Loans on Real Estate [Line Items]
Floating rate	2.75%	2.75%
30-day LIBOR rate	0.15%	0.17%
Debt number of days of LIBOR against interest rate basis	30 days	30 days
Belle Creek Apartments
Mortgage Loans on Real Estate [Line Items]
Floating rate	2.25%	2.25%
30-day LIBOR rate	0.15%	0.17%
Debt number of days of LIBOR against interest rate basis	30 days	30 days
Tresa At Arrowhead
Mortgage Loans on Real Estate [Line Items]
Floating rate	2.25%	2.25%
30-day LIBOR rate	0.15%	0.17%
Debt number of days of LIBOR against interest rate basis	30 days	30 days
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
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
King's Landing
Mortgage Loans on Real Estate [Line Items]
Interest payment period	Monthly
Principal date	Jun. 01, 2017
Amortization schedule	30 years

Date the debt agreement requires a change in payment type from interest only to principal and interest.

No definition available.

Name:	irt_DebtInstrumentDateOfFirstPrincipalAndInterestPayment
Namespace Prefix:	irt_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

Debt number of days of LIBOR against interest rate basis.

No definition available.

Name:	irt_DebtPeriodOfLIBORAgainstInterestRateBasis
Namespace Prefix:	irt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Fixed Interest Rate Bearing On Minimum Percentage Of Aggregate Outstanding Debt

No definition available.

Name:	irt_FixedInterestRateBearingOnMinimumPercentageOfAggregateOutstandingDebt
Namespace Prefix:	irt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Frequency of periodic payment for mortgage loans on real.

No definition available.

Name:	irt_FrequencyOfPeriodicPaymentForMortgageLoansOnRealEstate
Namespace Prefix:	irt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The 30-day LIBOR rate as of period end used for floating rate instruments.

No definition available.

Mortgage loans on real estate period of amortization schedule.

No definition available.

Name:	irt_MortgageLoansOnRealEstatePeriodOfAmortizationSchedule
Namespace Prefix:	irt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_MortgageLoansOnRealEstateLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration