<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xml:lang="en-US"
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2021q4"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="irt-20220725.xsd" xlink:type="simple"/>
    <context id="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001466085</identifier>
        </entity>
        <period>
            <startDate>2022-07-27</startDate>
            <endDate>2022-07-27</endDate>
        </period>
    </context>
    <dei:AmendmentFlag
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl80L2ZyYWc6ZDM3NDQwYjA2YjY4NGQ1MWIyNjE1MTRhN2YyOGQ4OTIvdGFibGU6NzY4MWUzMzQzNzBlNDRkNzhhZTgzZDA2MzIyY2QxNmIvdGFibGVyYW5nZTo3NjgxZTMzNDM3MGU0NGQ3OGFlODNkMDYzMjJjZDE2Yl8wLTEtMS0xLTIyNjYw_b50f8f60-7a4b-4274-9a9a-6a99a1af6962">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl80L2ZyYWc6ZDM3NDQwYjA2YjY4NGQ1MWIyNjE1MTRhN2YyOGQ4OTIvdGFibGU6NzY4MWUzMzQzNzBlNDRkNzhhZTgzZDA2MzIyY2QxNmIvdGFibGVyYW5nZTo3NjgxZTMzNDM3MGU0NGQ3OGFlODNkMDYzMjJjZDE2Yl8xLTEtMS0xLTIyNjYw_01e5512b-58fe-48e6-b7af-a8b0e6ce877e">0001466085</dei:EntityCentralIndexKey>
    <dei:DocumentType
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGV4dHJlZ2lvbjo1NDQ5NjEwZWIyMWI0NGIxOGFmMmZjYWY5OTg0YWVmMF8xNDky_98c5f2d0-8b5d-4a71-9038-301688e3631a">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGV4dHJlZ2lvbjo1NDQ5NjEwZWIyMWI0NGIxOGFmMmZjYWY5OTg0YWVmMF8zMTU_ac9a0040-7927-4c9a-9b79-ec737904733e">2022-07-25</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGV4dHJlZ2lvbjo1NDQ5NjEwZWIyMWI0NGIxOGFmMmZjYWY5OTg0YWVmMF8xNTAw_dec79bda-5f1f-4e7c-91d4-28307236fe48">Independence Realty Trust, Inc.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGFibGU6NDliODFhZTMxODBiNDU5MzgyNDQwZjA1OGZjMTM1MGQvdGFibGVyYW5nZTo0OWI4MWFlMzE4MGI0NTkzODI0NDBmMDU4ZmMxMzUwZF8wLTAtMS0xLTIyNjYw_3b3f4bf7-7016-4514-bee3-a2807d36dcc3">MD</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGFibGU6NDliODFhZTMxODBiNDU5MzgyNDQwZjA1OGZjMTM1MGQvdGFibGVyYW5nZTo0OWI4MWFlMzE4MGI0NTkzODI0NDBmMDU4ZmMxMzUwZF8wLTEtMS0xLTIyNjYw_8e7403e7-29c9-49c6-abb0-43a905fbc77d">001-36041</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGFibGU6NDliODFhZTMxODBiNDU5MzgyNDQwZjA1OGZjMTM1MGQvdGFibGVyYW5nZTo0OWI4MWFlMzE4MGI0NTkzODI0NDBmMDU4ZmMxMzUwZF8wLTItMS0xLTIyNjYw_a2b29629-b450-4594-8be0-27ee4d06be7e">26-4567130</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGV4dHJlZ2lvbjo1NDQ5NjEwZWIyMWI0NGIxOGFmMmZjYWY5OTg0YWVmMF8xNTAx_f3508a79-5897-4040-b2c8-10ce2be11e5b">1835 Market Street</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGV4dHJlZ2lvbjo1NDQ5NjEwZWIyMWI0NGIxOGFmMmZjYWY5OTg0YWVmMF8xNDk0_805f12d3-71ad-4609-b5f3-18056c2448a8">Suite 2601</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGV4dHJlZ2lvbjo1NDQ5NjEwZWIyMWI0NGIxOGFmMmZjYWY5OTg0YWVmMF8xNDk2_084eade7-a7f6-4964-9c2c-1e389c2eef52">Philadelphia</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGV4dHJlZ2lvbjo1NDQ5NjEwZWIyMWI0NGIxOGFmMmZjYWY5OTg0YWVmMF8xNDg5_39e500d9-c750-4cbc-a558-4002f10543cb">PA</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGV4dHJlZ2lvbjo1NDQ5NjEwZWIyMWI0NGIxOGFmMmZjYWY5OTg0YWVmMF8xNDkw_ab3bccb0-8118-4c5b-95b3-c4e758d9a1a0">19103</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGV4dHJlZ2lvbjo1NDQ5NjEwZWIyMWI0NGIxOGFmMmZjYWY5OTg0YWVmMF8xNDkx_30db384d-fcf2-4a51-b7ab-6bcdc0d49c80">267</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGV4dHJlZ2lvbjo1NDQ5NjEwZWIyMWI0NGIxOGFmMmZjYWY5OTg0YWVmMF8xNDk3_ff370b93-2efa-404f-ab8d-3004eadabb64">270-4800</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGFibGU6NTYyOGI3ZDY2MDg0NDNkZTljZWQzMDRlMzZhMjQzYjIvdGFibGVyYW5nZTo1NjI4YjdkNjYwODQ0M2RlOWNlZDMwNGUzNmEyNDNiMl8wLTAtMS0xLTIyNjYw_1ae29237-4d1a-4981-b328-dccd397c5016">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGFibGU6NTYyOGI3ZDY2MDg0NDNkZTljZWQzMDRlMzZhMjQzYjIvdGFibGVyYW5nZTo1NjI4YjdkNjYwODQ0M2RlOWNlZDMwNGUzNmEyNDNiMl8xLTAtMS0xLTIyNjYw_5b7b6c66-8457-47dd-81a6-d6befd60d437">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGFibGU6NTYyOGI3ZDY2MDg0NDNkZTljZWQzMDRlMzZhMjQzYjIvdGFibGVyYW5nZTo1NjI4YjdkNjYwODQ0M2RlOWNlZDMwNGUzNmEyNDNiMl8yLTAtMS0xLTIyNjYw_61a2eb9d-885f-4505-8cd5-4168f5cd44cb">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGFibGU6NTYyOGI3ZDY2MDg0NDNkZTljZWQzMDRlMzZhMjQzYjIvdGFibGVyYW5nZTo1NjI4YjdkNjYwODQ0M2RlOWNlZDMwNGUzNmEyNDNiMl8zLTAtMS0xLTIyNjYw_96245229-4d63-43b8-8155-b2feff5fd5e5">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGFibGU6MzA0YTMwYjBlMDdjNDJkN2FkZDUyYzIzMWNmOTkxNWEvdGFibGVyYW5nZTozMDRhMzBiMGUwN2M0MmQ3YWRkNTJjMjMxY2Y5OTE1YV8xLTAtMS0xLTIyNjYw_720f88ac-d62a-493e-812e-76bf7e701f07">Common stock</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGFibGU6MzA0YTMwYjBlMDdjNDJkN2FkZDUyYzIzMWNmOTkxNWEvdGFibGVyYW5nZTozMDRhMzBiMGUwN2M0MmQ3YWRkNTJjMjMxY2Y5OTE1YV8xLTItMS0xLTIyNjYw_6e808d3f-c921-4993-b916-ad0a342a4ebc">IRT</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGFibGU6MzA0YTMwYjBlMDdjNDJkN2FkZDUyYzIzMWNmOTkxNWEvdGFibGVyYW5nZTozMDRhMzBiMGUwN2M0MmQ3YWRkNTJjMjMxY2Y5OTE1YV8xLTQtMS0xLTIyNjYw_e0d23865-faae-4200-9711-f6d35ad57cd7">NYSE</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="i3cd5cc1195964a2b95957dfe92c9b6a1_D20220727-20220727"
      id="id3VybDovL2RvY3MudjEvZG9jOjA4MzhkYTE0Y2ZhODQ5NzhiZWIyY2RhYzg0M2ZlZTViL3NlYzowODM4ZGExNGNmYTg0OTc4YmViMmNkYWM4NDNmZWU1Yl8xL2ZyYWc6NTQ0OTYxMGViMjFiNDRiMThhZjJmY2FmOTk4NGFlZjAvdGV4dHJlZ2lvbjo1NDQ5NjEwZWIyMWI0NGIxOGFmMmZjYWY5OTg0YWVmMF8xNDk4_df979679-4c16-4917-ab2b-0b43891e3285">false</dei:EntityEmergingGrowthCompany>
</xbrl>
