<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>904</ContextCount>
  <ElementCount>429</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>250</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>11</UnitCount>
  <MyReports>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>75000 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>75010 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/CONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>75020 - Statement - CONSOLIDATED BALANCE SHEETS (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/CONSOLIDATEDBALANCESHEETSParentheticals</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>75030 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/CONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVEINCOMELOSS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>75040 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/CONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVEINCOMELOSSParentheticals</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>75050 - Statement - CONSOLIDATED STATEMENTS OF EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/CONSOLIDATEDSTATEMENTSOFEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>75060 - Statement - CONSOLIDATED STATEMENTS OF EQUITY (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/CONSOLIDATEDSTATEMENTSOFEQUITYParentheticals</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF EQUITY (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>75070 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>75080 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSParentheticals</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995455 - Disclosure - Organization and Description of Business</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/OrganizationandDescriptionofBusiness</Role>
      <ShortName>Organization and Description of Business</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995475 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/SummaryofSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995485 - Disclosure - Investments in Real Estate Subsidiaries</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/InvestmentsinRealEstateSubsidiaries</Role>
      <ShortName>Investments in Real Estate Subsidiaries</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995495 - Disclosure - Consolidated Real Estate Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/ConsolidatedRealEstateInvestments</Role>
      <ShortName>Consolidated Real Estate Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995505 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/Debt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995515 - Disclosure - Variable Interest Entities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/VariableInterestEntities</Role>
      <ShortName>Variable Interest Entities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995525 - Disclosure - Equity Method Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/EquityMethodInvestments</Role>
      <ShortName>Equity Method Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995535 - Disclosure - Fair Value of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/FairValueofFinancialInstruments</Role>
      <ShortName>Fair Value of Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995545 - Disclosure - Investments in DSTs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureInvestmentsInDsts</Role>
      <ShortName>Investments in DSTs</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995555 - Disclosure - Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/ShareholdersEquity</Role>
      <ShortName>Shareholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995565 - Disclosure - Earnings (Loss) Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/EarningsLossPerShare</Role>
      <ShortName>Earnings (Loss) Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995575 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/RelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995585 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995595 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995605 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/SegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995615 - Disclosure - Mezzanine Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureMezzanineEquity</Role>
      <ShortName>Mezzanine Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995625 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995635 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/SummaryofSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995655 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/SummaryofSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995665 - Disclosure - Investments in Real Estate Subsidiaries (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/InvestmentsinRealEstateSubsidiariesTables</Role>
      <ShortName>Investments in Real Estate Subsidiaries (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/InvestmentsinRealEstateSubsidiaries</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995675 - Disclosure - Consolidated Real Estate Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/ConsolidatedRealEstateInvestmentsTables</Role>
      <ShortName>Consolidated Real Estate Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/ConsolidatedRealEstateInvestments</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995685 - Disclosure - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DebtTables</Role>
      <ShortName>Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/Debt</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995695 - Disclosure - Variable Interest Entities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/VariableInterestEntitiesTables</Role>
      <ShortName>Variable Interest Entities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/VariableInterestEntities</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995705 - Disclosure - Equity Method Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/EquityMethodInvestmentsTables</Role>
      <ShortName>Equity Method Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/EquityMethodInvestments</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995715 - Disclosure - Fair Value of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/FairValueofFinancialInstrumentsTables</Role>
      <ShortName>Fair Value of Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/FairValueofFinancialInstruments</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995725 - Disclosure - Investments in DSTs (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/InvestmentsinDSTsTables</Role>
      <ShortName>Investments in DSTs (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureInvestmentsInDsts</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995735 - Disclosure - Shareholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/ShareholdersEquityTables</Role>
      <ShortName>Shareholders' Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/ShareholdersEquity</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995745 - Disclosure - Earnings (Loss) Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/EarningsLossPerShareTables</Role>
      <ShortName>Earnings (Loss) Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/EarningsLossPerShare</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995755 - Disclosure - Related Party Transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/RelatedPartyTransactionsTables</Role>
      <ShortName>Related Party Transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/RelatedPartyTransactions</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995765 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureCommitmentsAndContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/CommitmentsandContingencies</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995775 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/Leases</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995785 - Disclosure - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/SegmentInformationTables</Role>
      <ShortName>Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/SegmentInformation</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995795 - Disclosure - Mezzanine Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureMezzanineEquityTables</Role>
      <ShortName>Mezzanine Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureMezzanineEquity</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995805 - Disclosure - Organization and Description of Business (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/OrganizationandDescriptionofBusinessDetails</Role>
      <ShortName>Organization and Description of Business (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/OrganizationandDescriptionofBusiness</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995815 - Disclosure - Asset Acquisition - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/AssetAcquisitionNarrativeDetails</Role>
      <ShortName>Asset Acquisition - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995835 - Disclosure - Summary of Significant Accounting Policies - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/SummaryofSignificantAccountingPoliciesNarrativeDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995845 - Disclosure - Summary of Significant Accounting Policies - Schedule of Reconciliation of the Deferred Tax Asset (Liability (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/SummaryofSignificantAccountingPoliciesScheduleofReconciliationoftheDeferredTaxAssetLiabilityDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of Reconciliation of the Deferred Tax Asset (Liability (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995865 - Disclosure - Summary of Significant Accounting Policies - Schedule of Effective Income Tax Rate Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/SummaryofSignificantAccountingPoliciesScheduleofEffectiveIncomeTaxRateReconciliationDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of Effective Income Tax Rate Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995875 - Disclosure - Investments in Real Estate Subsidiaries - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/InvestmentsinRealEstateSubsidiariesNarrativeDetails</Role>
      <ShortName>Investments in Real Estate Subsidiaries - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995885 - Disclosure - Investments in Real Estate Subsidiaries - Schedule of Investments in SPEs Properties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/InvestmentsinRealEstateSubsidiariesScheduleofInvestmentsinSPEsPropertiesDetails</Role>
      <ShortName>Investments in Real Estate Subsidiaries - Schedule of Investments in SPEs Properties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995895 - Disclosure - Consolidated Real Estate Investments - Schedule of Components of Investments in Real Estate Properties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/ConsolidatedRealEstateInvestmentsScheduleofComponentsofInvestmentsinRealEstatePropertiesDetails</Role>
      <ShortName>Consolidated Real Estate Investments - Schedule of Components of Investments in Real Estate Properties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995905 - Disclosure - Consolidated Real Estate Investments - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/ConsolidatedRealEstateInvestmentsNarrativeDetails</Role>
      <ShortName>Consolidated Real Estate Investments - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995915 - Disclosure - Consolidated Real Estate Investments - Schedule of Sale of Properties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureConsolidatedRealEstateInvestmentsScheduleOfSaleOfPropertiesDetails</Role>
      <ShortName>Consolidated Real Estate Investments - Schedule of Sale of Properties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995925 - Disclosure - Debt - Schedule of Long-Term Notes Payable (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DebtScheduleofLongTermNotesPayableDetails</Role>
      <ShortName>Debt - Schedule of Long-Term Notes Payable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995935 - Disclosure - Debt - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DebtNarrativeDetails</Role>
      <ShortName>Debt - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>995945 - Disclosure - Debt - Schedule of Maturities of Long-Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DebtScheduleofMaturitiesofLongTermDebtDetails</Role>
      <ShortName>Debt - Schedule of Maturities of Long-Term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>995955 - Disclosure - Variable Interest Entities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/VariableInterestEntitiesDetails</Role>
      <ShortName>Variable Interest Entities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/VariableInterestEntitiesTables</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>995965 - Disclosure - Variable Interest Entities (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureVariableInterestEntitiesParentheticalDetails</Role>
      <ShortName>Variable Interest Entities (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/VariableInterestEntitiesTables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>995975 - Disclosure - Equity Method Investments - Schedule of Equity Method Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/EquityMethodInvestmentsScheduleofEquityMethodInvestmentsDetails</Role>
      <ShortName>Equity Method Investments - Schedule of Equity Method Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>995985 - Disclosure - Equity Method Investments - Schedule of Equity Method Investments (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureEquityMethodInvestmentsScheduleOfEquityMethodInvestmentsParentheticalDetails</Role>
      <ShortName>Equity Method Investments - Schedule of Equity Method Investments (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>995995 - Disclosure - Equity Method Investments - Schedule of Statement of Operations Summary (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/EquityMethodInvestmentsScheduleofStatementofOperationsSummaryDetails</Role>
      <ShortName>Equity Method Investments - Schedule of Statement of Operations Summary (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996005 - Disclosure - Fair Value of Financial Instruments - Assets at Fair Value on a Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/FairValueofFinancialInstrumentsAssetsatFairValueonaRecurringBasisDetails</Role>
      <ShortName>Fair Value of Financial Instruments - Assets at Fair Value on a Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996015 - Disclosure - Fair Value of Financial Instruments - Changes in Level 3 Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/FairValueofFinancialInstrumentsChangesinLevel3AssetsDetails</Role>
      <ShortName>Fair Value of Financial Instruments - Changes in Level 3 Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996025 - Disclosure - Fair Value of Financial Instruments - Significant Unobservable Inputs of Level 3 Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/FairValueofFinancialInstrumentsSignificantUnobservableInputsofLevel3AssetsDetails</Role>
      <ShortName>Fair Value of Financial Instruments - Significant Unobservable Inputs of Level 3 Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996035 - Disclosure - Fair Value of Financial Instruments - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/FairValueofFinancialInstrumentsNarrativeDetails</Role>
      <ShortName>Fair Value of Financial Instruments - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996045 - Disclosure - Fair Value of Financial Instruments - Schedule of Long-Term Debt Indebtedness (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/FairValueofFinancialInstrumentsScheduleofLongTermDebtIndebtednessDetails</Role>
      <ShortName>Fair Value of Financial Instruments - Schedule of Long-Term Debt Indebtedness (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996055 - Disclosure - Fair Value of Financial Instruments - Schedule of Derivative Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/FairValueofFinancialInstrumentsScheduleofDerivativeInstrumentsDetails</Role>
      <ShortName>Fair Value of Financial Instruments - Schedule of Derivative Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996065 - Disclosure - Investments in DSTs - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/InvestmentsinDSTsNarrativeDetails</Role>
      <ShortName>Investments in DSTs - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996075 - Disclosure - Investments in DSTs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/InvestmentsinDSTsDetails</Role>
      <ShortName>Investments in DSTs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/InvestmentsinDSTsTables</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996085 - Disclosure - Shareholders' Equity - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/ShareholdersEquityNarrativeDetails</Role>
      <ShortName>Shareholders' Equity - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996095 - Disclosure - Shareholders' Equity - Schedule of Distributions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureShareholdersEquityScheduleOfDistributionsDetails</Role>
      <ShortName>Shareholders' Equity - Schedule of Distributions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996105 - Disclosure - Shareholders' Equity - Schedule of Distributions (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureShareholdersEquityScheduleOfDistributionsParentheticalDetails</Role>
      <ShortName>Shareholders' Equity - Schedule of Distributions (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996115 - Disclosure - Shareholders' Equity - Restricted Stock Units Activities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/ShareholdersEquityRestrictedStockUnitsActivitiesDetails</Role>
      <ShortName>Shareholders' Equity - Restricted Stock Units Activities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>996125 - Disclosure - Shareholders' Equity - Restricted Stock Units Vesting Schedule (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/ShareholdersEquityRestrictedStockUnitsVestingScheduleDetails</Role>
      <ShortName>Shareholders' Equity - Restricted Stock Units Vesting Schedule (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>996135 - Disclosure - Earnings (Loss) Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/EarningsLossPerShareDetails</Role>
      <ShortName>Earnings (Loss) Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/EarningsLossPerShareTables</ParentRole>
      <Position>76</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>996145 - Disclosure - Related Party Transactions - Advisory and Administrative Fees (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureRelatedPartyTransactionsAdvisoryAndAdministrativeFeesDetails</Role>
      <ShortName>Related Party Transactions - Advisory and Administrative Fees (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>996155 - Disclosure - Related Party Transactions - Reimbursement of Expenses; Expense Cap (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureRelatedPartyTransactionsReimbursementOfExpensesExpenseCapDetails</Role>
      <ShortName>Related Party Transactions - Reimbursement of Expenses; Expense Cap (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>996165 - Disclosure - Related Party Transactions - Revolving Credit Facility, NXDT and Guaranties of NexPoint Storage Partners, Inc. Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/RelatedPartyTransactionsRevolvingCreditFacilityNXDTandGuarantiesofNexPointStoragePartnersIncDebtDetails</Role>
      <ShortName>Related Party Transactions - Revolving Credit Facility, NXDT and Guaranties of NexPoint Storage Partners, Inc. Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>996175 - Disclosure - Related Party Transactions - NexBank Guaranty (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureRelatedPartyTransactionsNexbankGuarantyDetails</Role>
      <ShortName>Related Party Transactions - NexBank Guaranty (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>996185 - Disclosure - Related Party Transactions - Guaranties of WLIF I (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureRelatedPartyTransactionsGuarantiesOfWlifIDetails</Role>
      <ShortName>Related Party Transactions - Guaranties of WLIF I (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>996195 - Disclosure - Related Party Transactions - Investments in DSTs, Capital Acquisitions Partners, LLC and SFR WLIF III, LLC (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/RelatedPartyTransactionsInvestmentsinDSTsCapitalAcquisitionsPartnersLLCandSFRWLIFIIILLCDetails</Role>
      <ShortName>Related Party Transactions - Investments in DSTs, Capital Acquisitions Partners, LLC and SFR WLIF III, LLC (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>996205 - Disclosure - Related Party Transactions - OSL Loan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureRelatedPartyTransactionsOslLoanDetails</Role>
      <ShortName>Related Party Transactions - OSL Loan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>996215 - Disclosure - Related Party Transactions - Other Related Party Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/RelatedPartyTransactionsOtherRelatedPartyTransactionsDetails</Role>
      <ShortName>Related Party Transactions - Other Related Party Transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>996225 - Disclosure - Related Party Transactions - Schedule of Related Party Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/RelatedPartyTransactionsScheduleofRelatedPartyTransactionsDetails</Role>
      <ShortName>Related Party Transactions - Schedule of Related Party Transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>996235 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/CommitmentsandContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureCommitmentsAndContingenciesTables</ParentRole>
      <Position>86</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>996245 - Disclosure - Commitments and Contingencies - Schedule of Company's Unfunded Commitments By Investment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfCompanysUnfundedCommitmentsByInvestmentDetails</Role>
      <ShortName>Commitments and Contingencies - Schedule of Company's Unfunded Commitments By Investment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>996265 - Disclosure - Leases - Schedule of Concentration of Risk, by Risk Factor (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/LeasesScheduleofConcentrationofRiskbyRiskFactorDetails</Role>
      <ShortName>Leases - Schedule of Concentration of Risk, by Risk Factor (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>996275 - Disclosure - Leases - Schedule of Lessee, Operating Lease, Liability, Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/LeasesScheduleofLesseeOperatingLeaseLiabilityMaturityDetails_1</Role>
      <ShortName>Leases - Schedule of Lessee, Operating Lease, Liability, Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>996295 - Disclosure - Leases - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/LeasesNarrativeDetails</Role>
      <ShortName>Leases - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>996305 - Disclosure - Segment Information - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/SegmentInformationNarrativeDetails</Role>
      <ShortName>Segment Information - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>996315 - Disclosure - Segment Information - Schedule of Segment Reporting Information 1 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/SegmentInformationScheduleofSegmentReportingInformation1Details</Role>
      <ShortName>Segment Information - Schedule of Segment Reporting Information 1 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>996325 - Disclosure - Segment Information - Schedule of Segment Reporting Information 2 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/SegmentInformationScheduleofSegmentReportingInformation2Details</Role>
      <ShortName>Segment Information - Schedule of Segment Reporting Information 2 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>996335 - Disclosure - Mezzanine Equity - Schedule of Redeemable Noncontrolling Interest (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureMezzanineEquityScheduleOfRedeemableNoncontrollingInterestDetails</Role>
      <ShortName>Mezzanine Equity - Schedule of Redeemable Noncontrolling Interest (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>996345 - Disclosure - Mezzanine Equity - Schedule of Redeemable Series B Preferred Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureMezzanineEquityScheduleOfRedeemableSeriesBPreferredSharesDetails</Role>
      <ShortName>Mezzanine Equity - Schedule of Redeemable Series B Preferred Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="nxdt-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>996355 - Disclosure - Subsequent Events - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nexpoint.com/20260630/taxonomy/role/DisclosureSubsequentEventsAdditionalInformationDetails</Role>
      <ShortName>Subsequent Events - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="nxdt-20260630.htm">nxdt-20260630.htm</File>
    <File>nxdt-20260630.xsd</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="12">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="1838">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="33">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
