XML 73 R54.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Summary of PSUs Granted (Detail) - Performance Share Units - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Relative 3-year TSR vs NAREIT Apartment Index |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Grant Date | Feb. 23, 2018 | Feb. 28, 2017
Type of PSUs Granted | Relative 3-year TSR vs NAREIT Apartment Index | Relative 3-year TSR vs NAREIT Apartment Index
Number of PSUs Granted | 317,906 | 135,881
Performance Period Commencement Date | Jan. 01, 2018 | Jan. 01, 2017
Performance Period End Date | Dec. 31, 2020 | Dec. 31, 2019
Grant Date Fair Value | $ 4.19 | $ 4.83
Number of PSUs Outstanding as of December 31, 2018 | 317,906 | 135,881
Strategic Objectives |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Grant Date | Feb. 23, 2018 | Jul. 26, 2017
Type of PSUs Granted | Strategic Objectives | Strategic Objectives
Number of PSUs Granted | 136,245 | 45,294
Performance Period Commencement Date | Jan. 01, 2018 | Jan. 01, 2017
Performance Period End Date | Dec. 31, 2020 | Dec. 31, 2019
Grant Date Fair Value | $ 8.67 | $ 9.87
Number of PSUs Outstanding as of December 31, 2018 | 136,245 | 45,294
Absolute 3-Year TSR |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Grant Date |  | Feb. 28, 2017
Type of PSUs Granted |  | Absolute 3-Year TSR
Number of PSUs Granted |  | 45,294
Performance Period Commencement Date |  | Jan. 01, 2017
Performance Period End Date |  | Dec. 31, 2019
Grant Date Fair Value |  | $ 3.13
Number of PSUs Outstanding as of December 31, 2018 |  | 45,294

X
- Definition Share based compensation arrangement by share based payment award equity instruments other than options grant date. + References No definition available. + Details
Name: | irt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantDate
Namespace Prefix: | irt_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award equity instruments other than options performance period commencement date. + References No definition available. + Details
Name: | irt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformancePeriodCommencementDate
Namespace Prefix: | irt_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award equity instruments other than options performance period end date. + References No definition available. + Details
Name: | irt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformancePeriodEndDate
Namespace Prefix: | irt_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award other than options type of award granted. + References No definition available. + Details
Name: | irt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsTypeOfAwardGranted
Namespace Prefix: | irt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |