XML 38 R55.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

Summary of PSU Activity of the Incentive Plan (Parenthetical) (Detail) - Performance Share Units	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted based on target award performance period	3 years
Number of shares granted based on target award percentage		150.00%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted based on target award percentage	0.00%
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted based on target award percentage	150.00%

X

- Definition

Share based compensation arrangement, by share based payment award, number of shares granted based on target award percentage.

+ References

No definition available.

+ Details

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

X

- Definition

Share based compensation arrangement by share based payment award number of shares granted based on target award performance period.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: