<?xml version='1.0' encoding='UTF-8'?>
<FilingSummary>
  <Version>3.5.0.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>564</ContextCount>
  <ElementCount>470</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>161</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/StatementConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100020 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100030 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/StatementConsolidatedStatementsOfOperations</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100040 - Statement - Consolidated Statements of Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncomeLoss</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100050 - Statement - Consolidated Statement of Changes in Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/StatementConsolidatedStatementOfChangesInEquity</Role>
      <ShortName>Consolidated Statement of Changes in Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100060 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/StatementConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100070 - Disclosure - THE COMPANY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureTHECOMPANY</Role>
      <ShortName>THE COMPANY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100080 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100090 - Disclosure - INVESTMENTS IN LOANS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureINVESTMENTSINLOANS</Role>
      <ShortName>INVESTMENTS IN LOANS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100100 - Disclosure - INVESTMENTS IN REAL ESTATE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureINVESTMENTSINREALESTATE</Role>
      <ShortName>INVESTMENTS IN REAL ESTATE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>100110 - Disclosure - INDEBTEDNESS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureINDEBTEDNESS</Role>
      <ShortName>INDEBTEDNESS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>100120 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureDERIVATIVEFINANCIALINSTRUMENTS</Role>
      <ShortName>DERIVATIVE FINANCIAL INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>100130 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureFAIRVALUEOFFINANCIALINSTRUMENTS</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>100140 - Disclosure - VARIABLE INTEREST ENTITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureVARIABLEINTERESTENTITIES</Role>
      <ShortName>VARIABLE INTEREST ENTITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>100150 - Disclosure - SERIES D PREFERRED SHARES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSERIESDPREFERREDSHARES</Role>
      <ShortName>SERIES D PREFERRED SHARES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>100160 - Disclosure - SHAREHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSHAREHOLDERSEQUITY</Role>
      <ShortName>SHAREHOLDERS' EQUITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>100170 - Disclosure - EARNINGS (LOSS) PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureEARNINGSLOSSPERSHARE</Role>
      <ShortName>EARNINGS (LOSS) PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>100180 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureRELATEDPARTYTRANSACTIONS</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>100190 - Disclosure - SUPPLEMENTAL DISCLOSURE TO STATEMENT OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSUPPLEMENTALDISCLOSURETOSTATEMENTOFCASHFLOWS</Role>
      <ShortName>SUPPLEMENTAL DISCLOSURE TO STATEMENT OF CASH FLOWS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>100200 - Disclosure - SEGMENT REPORTING</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSEGMENTREPORTING</Role>
      <ShortName>SEGMENT REPORTING</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>100210 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureCOMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>100220 - Disclosure - DISCONTINUED OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureDISCONTINUEDOPERATIONS</Role>
      <ShortName>DISCONTINUED OPERATIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>100230 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSUBSEQUENTEVENTS</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>100240 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>100250 - Disclosure - INVESTMENTS IN LOANS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureINVESTMENTSINLOANSTables</Role>
      <ShortName>INVESTMENTS IN LOANS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.raitft.com/20160930/taxonomy/role/DisclosureINVESTMENTSINLOANS</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>100260 - Disclosure - INVESTMENTS IN REAL ESTATE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureINVESTMENTSINREALESTATETables</Role>
      <ShortName>INVESTMENTS IN REAL ESTATE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.raitft.com/20160930/taxonomy/role/DisclosureINVESTMENTSINREALESTATE</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>100270 - Disclosure - INDEBTEDNESS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureINDEBTEDNESSTables</Role>
      <ShortName>INDEBTEDNESS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.raitft.com/20160930/taxonomy/role/DisclosureINDEBTEDNESS</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>100280 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureDERIVATIVEFINANCIALINSTRUMENTSTables</Role>
      <ShortName>DERIVATIVE FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.raitft.com/20160930/taxonomy/role/DisclosureDERIVATIVEFINANCIALINSTRUMENTS</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>100290 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureFAIRVALUEOFFINANCIALINSTRUMENTSTables</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.raitft.com/20160930/taxonomy/role/DisclosureFAIRVALUEOFFINANCIALINSTRUMENTS</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>100300 - Disclosure - VARIABLE INTEREST ENTITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureVARIABLEINTERESTENTITIESTables</Role>
      <ShortName>VARIABLE INTEREST ENTITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.raitft.com/20160930/taxonomy/role/DisclosureVARIABLEINTERESTENTITIES</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>100310 - Disclosure - SERIES D PREFERRED SHARES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSERIESDPREFERREDSHARESTables</Role>
      <ShortName>SERIES D PREFERRED SHARES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.raitft.com/20160930/taxonomy/role/DisclosureSERIESDPREFERREDSHARES</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>100320 - Disclosure - SHAREHOLDERS' EQUITY (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSHAREHOLDERSEQUITYTables</Role>
      <ShortName>SHAREHOLDERS' EQUITY (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.raitft.com/20160930/taxonomy/role/DisclosureSHAREHOLDERSEQUITY</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>100330 - Disclosure - EARNINGS (LOSS) PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureEARNINGSLOSSPERSHARETables</Role>
      <ShortName>EARNINGS (LOSS) PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.raitft.com/20160930/taxonomy/role/DisclosureEARNINGSLOSSPERSHARE</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>100340 - Disclosure - SUPPLEMENTAL DISCLOSURE TO STATEMENT OF CASH FLOWS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSUPPLEMENTALDISCLOSURETOSTATEMENTOFCASHFLOWSTables</Role>
      <ShortName>SUPPLEMENTAL DISCLOSURE TO STATEMENT OF CASH FLOWS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.raitft.com/20160930/taxonomy/role/DisclosureSUPPLEMENTALDISCLOSURETOSTATEMENTOFCASHFLOWS</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>100350 - Disclosure - DISCONTINUED OPERATIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureDISCONTINUEDOPERATIONSTables</Role>
      <ShortName>DISCONTINUED OPERATIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.raitft.com/20160930/taxonomy/role/DisclosureDISCONTINUEDOPERATIONS</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>100360 - Disclosure - The Company - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureTheCompanyAdditionalInformationDetail</Role>
      <ShortName>The Company - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>100370 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail</Role>
      <ShortName>Summary of Significant Accounting Policies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>100380 - Disclosure - Investments in Loans (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureInvestmentsInLoansDetail</Role>
      <ShortName>Investments in Loans (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>100400 - Disclosure - Investments in Loans (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureInvestmentsInLoansParentheticalDetail</Role>
      <ShortName>Investments in Loans (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>100410 - Disclosure - Delinquency Statistics of Commercial Real Estate Loan (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureDelinquencyStatisticsOfCommercialRealEstateLoanDetail</Role>
      <ShortName>Delinquency Statistics of Commercial Real Estate Loan (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>100420 - Disclosure - Investments in Loans - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureInvestmentsInLoansAdditionalInformationDetail</Role>
      <ShortName>Investments in Loans - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>100430 - Disclosure - Investment in Loans by Credit Risk Category (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureInvestmentInLoansByCreditRiskCategoryDetail</Role>
      <ShortName>Investment in Loans by Credit Risk Category (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>100440 - Disclosure - Roll-Forwards of Allowance for Loan Losses for Commercial Mortgage Loans, Mezzanine Loans and Preferred Equity Interests (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureRollForwardsOfAllowanceForLoanLossesForCommercialMortgageLoansMezzanineLoansAndPreferredEquityInterestsDetail</Role>
      <ShortName>Roll-Forwards of Allowance for Loan Losses for Commercial Mortgage Loans, Mezzanine Loans and Preferred Equity Interests (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>100450 - Disclosure - Loans on Watchlist or Considered to be Impaired (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureLoansOnWatchlistOrConsideredToBeImpairedDetail</Role>
      <ShortName>Loans on Watchlist or Considered to be Impaired (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>100460 - Disclosure - Loans on Watchlist or Considered to be Impaired (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureLoansOnWatchlistOrConsideredToBeImpairedParentheticalDetail</Role>
      <ShortName>Loans on Watchlist or Considered to be Impaired (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>100470 - Disclosure - Summary of Investments in Real Estate (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSummaryOfInvestmentsInRealEstateDetail</Role>
      <ShortName>Summary of Investments in Real Estate (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>100480 - Disclosure - Summary of Investments in Real Estate (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSummaryOfInvestmentsInRealEstateParentheticalDetail</Role>
      <ShortName>Summary of Investments in Real Estate (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>100490 - Disclosure - Investments in Real Estate - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureInvestmentsInRealEstateAdditionalInformationDetail</Role>
      <ShortName>Investments in Real Estate - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>100500 - Disclosure - Aggregate Estimated Fair Value of Assets and Liabilities Acquired (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureAggregateEstimatedFairValueOfAssetsAndLiabilitiesAcquiredDetail</Role>
      <ShortName>Aggregate Estimated Fair Value of Assets and Liabilities Acquired (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>100510 - Disclosure - Consideration Transferred to Acquire Real Estate Properties (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureConsiderationTransferredToAcquireRealEstatePropertiesDetail</Role>
      <ShortName>Consideration Transferred to Acquire Real Estate Properties (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>100520 - Disclosure - Consideration Transferred to Acquire Real Estate Properties (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureConsiderationTransferredToAcquireRealEstatePropertiesParentheticalDetail</Role>
      <ShortName>Consideration Transferred to Acquire Real Estate Properties (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>100530 - Disclosure - Schedule of Revenue and Net Income (Loss) for the Properties Acquired (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureScheduleOfRevenueAndNetIncomeLossForPropertiesAcquiredDetail</Role>
      <ShortName>Schedule of Revenue and Net Income (Loss) for the Properties Acquired (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>100540 - Disclosure - Consolidated Unaudited Pro Forma Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureConsolidatedUnauditedProFormaInformationDetail</Role>
      <ShortName>Consolidated Unaudited Pro Forma Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>100550 - Disclosure - Summary of Disposition and Each Property's Contribution (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSummaryOfDispositionAndEachPropertySContributionDetail</Role>
      <ShortName>Summary of Disposition and Each Property's Contribution (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>100560 - Disclosure - Summary of Disposition and Each Property's Contribution (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSummaryOfDispositionAndEachPropertySContributionParentheticalDetail</Role>
      <ShortName>Summary of Disposition and Each Property's Contribution (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>100570 - Disclosure - Summary of Total Recourse and Non-Recourse Indebtedness (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSummaryOfTotalRecourseAndNonRecourseIndebtednessDetail</Role>
      <ShortName>Summary of Total Recourse and Non-Recourse Indebtedness (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>100580 - Disclosure - Summary of Total Recourse and Non-Recourse Indebtedness (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSummaryOfTotalRecourseAndNonRecourseIndebtednessParentheticalDetail</Role>
      <ShortName>Summary of Total Recourse and Non-Recourse Indebtedness (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>100590 - Disclosure - Indebtedness - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureIndebtednessAdditionalInformationDetail</Role>
      <ShortName>Indebtedness - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>100600 - Disclosure - Aggregate Contractual Maturities of Indebtedness by Year (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureAggregateContractualMaturitiesOfIndebtednessByYearDetail</Role>
      <ShortName>Aggregate Contractual Maturities of Indebtedness by Year (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>100610 - Disclosure - Aggregate Contractual Maturities of Indebtedness by Year (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureAggregateContractualMaturitiesOfIndebtednessByYearParentheticalDetail</Role>
      <ShortName>Aggregate Contractual Maturities of Indebtedness by Year (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>100620 - Disclosure - Aggregate Notional Amount and Estimated Net Fair Value of Derivative Instruments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureAggregateNotionalAmountAndEstimatedNetFairValueOfDerivativeInstrumentsDetail</Role>
      <ShortName>Aggregate Notional Amount and Estimated Net Fair Value of Derivative Instruments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>100630 - Disclosure - Derivative Financial Instruments - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAdditionalInformationDetail</Role>
      <ShortName>Derivative Financial Instruments - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>100640 - Disclosure - Carrying Amount and Fair Value of Financial Instruments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureCarryingAmountAndFairValueOfFinancialInstrumentsDetail</Role>
      <ShortName>Carrying Amount and Fair Value of Financial Instruments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>100650 - Disclosure - Information of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureInformationOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail</Role>
      <ShortName>Information of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>100660 - Disclosure - Information of Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureInformationOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisParentheticalDetail</Role>
      <ShortName>Information of Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>100670 - Disclosure - Fair Value of Financial Instruments - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetail</Role>
      <ShortName>Fair Value of Financial Instruments - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>100680 - Disclosure - Additional Information about Assets and Liabilities That Are Measured at Fair Value on Recurring Basis (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureAdditionalInformationAboutAssetsAndLiabilitiesThatAreMeasuredAtFairValueOnRecurringBasisDetail</Role>
      <ShortName>Additional Information about Assets and Liabilities That Are Measured at Fair Value on Recurring Basis (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>100690 - Disclosure - Fair Value Hierarchy for Financial Instruments Not Fair Valued but For Which Fair Value Is Required To Be Disclosed (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureFairValueHierarchyForFinancialInstrumentsNotFairValuedButForWhichFairValueIsRequiredToBeDisclosedDetail</Role>
      <ShortName>Fair Value Hierarchy for Financial Instruments Not Fair Valued but For Which Fair Value Is Required To Be Disclosed (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>100700 - Disclosure - Realized and Unrealized Gains and Losses on Assets and Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureRealizedAndUnrealizedGainsAndLossesOnAssetsAndLiabilitiesDetail</Role>
      <ShortName>Realized and Unrealized Gains and Losses on Assets and Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>100710 - Disclosure - Variable Interest Entities - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureVariableInterestEntitiesAdditionalInformationDetail</Role>
      <ShortName>Variable Interest Entities - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>100720 - Disclosure - Assets and Liabilities of Consolidated Variable Interest Entities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureAssetsAndLiabilitiesOfConsolidatedVariableInterestEntitiesDetail</Role>
      <ShortName>Assets and Liabilities of Consolidated Variable Interest Entities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>100730 - Disclosure - Series D Preferred Shares - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSeriesDPreferredSharesAdditionalInformationDetail</Role>
      <ShortName>Series D Preferred Shares - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>100740 - Disclosure - Sales Activity of Series D Preferred Shares (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSalesActivityOfSeriesDPreferredSharesDetail</Role>
      <ShortName>Sales Activity of Series D Preferred Shares (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>100750 - Disclosure - Dividends Declared and Paid on Preferred Shares (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureDividendsDeclaredAndPaidOnPreferredSharesDetail</Role>
      <ShortName>Dividends Declared and Paid on Preferred Shares (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>100760 - Disclosure - Shareholders' Equity - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureShareholdersEquityAdditionalInformationDetail</Role>
      <ShortName>Shareholders' Equity - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>100770 - Disclosure - Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureReconciliationOfBasicAndDilutedEarningsLossPerShareDetail</Role>
      <ShortName>Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>100780 - Disclosure - Earnings (Loss) Per Share - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureEarningsLossPerShareAdditionalInformationDetail</Role>
      <ShortName>Earnings (Loss) Per Share - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>100790 - Disclosure - Supplemental Cash Flow Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSupplementalCashFlowInformationDetail</Role>
      <ShortName>Supplemental Cash Flow Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>100800 - Disclosure - Segment Reporting - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSegmentReportingAdditionalInformationDetail</Role>
      <ShortName>Segment Reporting - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>100810 - Disclosure - Discontinued Operations - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureDiscontinuedOperationsAdditionalInformationDetail</Role>
      <ShortName>Discontinued Operations - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>100820 - Disclosure - Total Assets and Liabilities of Discontinued Operations (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureTotalAssetsAndLiabilitiesOfDiscontinuedOperationsDetail</Role>
      <ShortName>Total Assets and Liabilities of Discontinued Operations (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>100830 - Disclosure - Statements of Operations of Discontinued Operations (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureStatementsOfOperationsOfDiscontinuedOperationsDetail</Role>
      <ShortName>Statements of Operations of Discontinued Operations (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>100840 - Disclosure - Summary of Cash Flows of Discontinued Operations (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSummaryOfCashFlowsOfDiscontinuedOperationsDetail</Role>
      <ShortName>Summary of Cash Flows of Discontinued Operations (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="ras-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>100850 - Disclosure - Subsequent Events - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.raitft.com/20160930/taxonomy/role/DisclosureSubsequentEventsAdditionalInformationDetail</Role>
      <ShortName>Subsequent Events - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>ras-20160930.xml</File>
    <File>ras-20160930.xsd</File>
    <File>ras-20160930_cal.xml</File>
    <File>ras-20160930_def.xml</File>
    <File>ras-20160930_lab.xml</File>
    <File>ras-20160930_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies/>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
