<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>602</ContextCount>
  <ElementCount>421</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>256</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>75000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>75010 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/StatementConsolidatedBalanceSheets</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>75020 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>75030 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFOPERATIONS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF OPERATIONS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>75040 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>75050 - Statement - CONSOLIDATED STATEMENTS OF EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>75060 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/StatementConsolidatedStatementsOfCashFlows</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.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>8</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.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>9</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995455 - Disclosure - Cybersecurity Risk Management, Strategy and Governance</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureCybersecurityRiskManagementStrategyAndGovernance</Role>
      <ShortName>Cybersecurity Risk Management, Strategy and Governance</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995465 - Disclosure - Nature of Business, Basis of Presentation and Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureNatureOfBusinessBasisOfPresentationAndSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Nature of Business, Basis of Presentation and Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995475 - Disclosure - Acquisitions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureAcquisitions</Role>
      <ShortName>Acquisitions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995495 - Disclosure - Other Assets and Intangibles, net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureOtherAssetsAndIntangiblesNet</Role>
      <ShortName>Other Assets and Intangibles, net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995505 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureLeases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995525 - Disclosure - Indebtedness, net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureIndebtednessNet1</Role>
      <ShortName>Indebtedness, net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995535 - Disclosure - Financial Instruments and Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureFinancialInstrumentsAndFairValueMeasurements</Role>
      <ShortName>Financial Instruments and Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995545 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureCommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995555 - Disclosure - Accumulated Other Comprehensive (Loss) Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureAccumulatedOtherComprehensiveLossIncome</Role>
      <ShortName>Accumulated Other Comprehensive (Loss) Income</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995575 - Disclosure - Stock-Based Compensation and Employee Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureStockbasedCompensationAndEmployeeBenefits1</Role>
      <ShortName>Stock-Based Compensation and Employee Benefits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995585 - Disclosure - Equity and Non-Controlling Interests</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureEquityAndNoncontrollingInterests</Role>
      <ShortName>Equity and Non-Controlling Interests</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995595 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureEarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995605 - Disclosure - Agreements and Transactions with SITE Centers</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureAgreementsAndTransactionsWithSiteCenters</Role>
      <ShortName>Agreements and Transactions with SITE Centers</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995615 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995625 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureSubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995665 - Disclosure - Nature of Business, Basis of Presentation and Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureNatureOfBusinessBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Nature of Business, Basis of Presentation and Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://curbline.com/20251231/taxonomy/role/DisclosureNatureOfBusinessBasisOfPresentationAndSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995675 - Disclosure - Nature of Business, Basis of Presentation and Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureNatureOfBusinessBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Nature of Business, Basis of Presentation and Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://curbline.com/20251231/taxonomy/role/DisclosureNatureOfBusinessBasisOfPresentationAndSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995685 - Disclosure - Acquisitions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureAcquisitionsTables</Role>
      <ShortName>Acquisitions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://curbline.com/20251231/taxonomy/role/Role_DisclosureAcquisitions</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995705 - Disclosure - Other Assets and Intangibles, net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureOtherAssetsAndIntangiblesNetTables</Role>
      <ShortName>Other Assets and Intangibles, net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://curbline.com/20251231/taxonomy/role/Role_DisclosureOtherAssetsAndIntangiblesNet</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995715 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureLeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://curbline.com/20251231/taxonomy/role/Role_DisclosureLeases</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995725 - Disclosure - Indebtedness, net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureIndebtednessNetTables</Role>
      <ShortName>Indebtedness, net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://curbline.com/20251231/taxonomy/role/DisclosureIndebtednessNet1</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995735 - Disclosure - Financial Instruments and Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureFinancialInstrumentsAndFairValueMeasurementsTables</Role>
      <ShortName>Financial Instruments and Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://curbline.com/20251231/taxonomy/role/Role_DisclosureFinancialInstrumentsAndFairValueMeasurements</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995755 - Disclosure - Accumulated Other Comprehensive (Loss) Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureAccumulatedOtherComprehensiveLossIncomeTables</Role>
      <ShortName>Accumulated Other Comprehensive (Loss) Income (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://curbline.com/20251231/taxonomy/role/DisclosureAccumulatedOtherComprehensiveLossIncome</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995775 - Disclosure - Stock-Based Compensation and Employee Benefits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureStockbasedCompensationAndEmployeeBenefitsTables</Role>
      <ShortName>Stock-Based Compensation and Employee Benefits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://curbline.com/20251231/taxonomy/role/DisclosureStockbasedCompensationAndEmployeeBenefits1</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995785 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureEarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://curbline.com/20251231/taxonomy/role/Role_DisclosureEarningsPerShare</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995795 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://curbline.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxes</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995815 - Disclosure - Nature of Business, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureNatureOfBusinessBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail</Role>
      <ShortName>Nature of Business, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995825 - Disclosure - Nature of Business, Basis of Presentation and Summary of Significant Accounting Policies - Non-cash Investing and Financing Activities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureNatureOfBusinessBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesNoncashInvestingAndFinancingActivitiesDetail</Role>
      <ShortName>Nature of Business, Basis of Presentation and Summary of Significant Accounting Policies - Non-cash Investing and Financing Activities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995835 - Disclosure - Nature of Business, Basis of Presentation and Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureNatureOfBusinessBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesEstimatedUsefulLivesOfAssetsDetail</Role>
      <ShortName>Nature of Business, Basis of Presentation and Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995845 - Disclosure - Acquisitions - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureAcquisitionsAdditionalInformationDetail</Role>
      <ShortName>Acquisitions - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995855 - Disclosure - Acquisitions - Schedule of Acquisition Cost of Shopping Centers (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureAcquisitionsScheduleOfAcquisitionCostOfShoppingCentersDetail</Role>
      <ShortName>Acquisitions - Schedule of Acquisition Cost of Shopping Centers (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995875 - Disclosure - Other Assets and Intangibles, net - Components of Other Assets and Intangibles (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureOtherAssetsAndIntangiblesNetComponentsOfOtherAssetsAndIntangiblesDetail</Role>
      <ShortName>Other Assets and Intangibles, net - Components of Other Assets and Intangibles (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995905 - Disclosure - Other Assets and Intangibles, net - Components of Other Assets and Intangibles (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureOtherAssetsAndIntangiblesNetComponentsOfOtherAssetsAndIntangiblesParentheticalDetail</Role>
      <ShortName>Other Assets and Intangibles, net - Components of Other Assets and Intangibles (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995915 - Disclosure - Other Assets and Intangibles, net - Summary of Amortization Related to the Intangibles (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureOtherAssetsAndIntangiblesNetSummaryOfAmortizationRelatedToTheIntangiblesDetail</Role>
      <ShortName>Other Assets and Intangibles, net - Summary of Amortization Related to the Intangibles (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995925 - Disclosure - Other Assets and Intangibles, net - Summary of Estimated Net Future Amortization Income Associated with Intangibles (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureOtherAssetsAndIntangiblesNetSummaryOfEstimatedNetFutureAmortizationIncomeAssociatedWithIntangiblesDetail</Role>
      <ShortName>Other Assets and Intangibles, net - Summary of Estimated Net Future Amortization Income Associated with Intangibles (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995935 - Disclosure - Other Assets and Intangibles, net - Summary of Estimated Net Future Amortization Expenses Associated with Intangibles (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureOtherAssetsAndIntangiblesNetSummaryOfEstimatedNetFutureAmortizationExpensesAssociatedWithIntangiblesDetail</Role>
      <ShortName>Other Assets and Intangibles, net - Summary of Estimated Net Future Amortization Expenses Associated with Intangibles (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995945 - Disclosure - Leases - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureLeasesAdditionalInformationDetail</Role>
      <ShortName>Leases - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995955 - Disclosure - Leases - Summary of Operating Lease Income (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureLeasesSummaryOfOperatingLeaseIncomeDetail</Role>
      <ShortName>Leases - Summary of Operating Lease Income (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995965 - Disclosure - Leases - Schedule of Future Minimum Rental Income from Rental Properties under Terms of Non-Cancelable Tenant Leases (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureLeasesScheduleOfFutureMinimumRentalIncomeFromRentalPropertiesUnderTermsOfNonCancelableTenantLeasesDetail</Role>
      <ShortName>Leases - Schedule of Future Minimum Rental Income from Rental Properties under Terms of Non-Cancelable Tenant Leases (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995975 - Disclosure - Indebtedness, net - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureIndebtednessNetAdditionalInformationDetails</Role>
      <ShortName>Indebtedness, net - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995985 - Disclosure - Indebtedness, net - Summary of Outstanding Indebtedness (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureIndebtednessNetSummaryOfOutstandingIndebtednessDetail</Role>
      <ShortName>Indebtedness, net - Summary of Outstanding Indebtedness (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995995 - Disclosure - Indebtedness, net - Schedule of Principal Repayments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureIndebtednessNetScheduleOfPrincipalRepaymentsDetails</Role>
      <ShortName>Indebtedness, net - Schedule of Principal Repayments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>996005 - Disclosure - Financial Instruments and Fair Value Measurements - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureFinancialInstrumentsAndFairValueMeasurementsAdditionalInformationDetail</Role>
      <ShortName>Financial Instruments and Fair Value Measurements - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>996015 - Disclosure - Financial Instruments and Fair Value Measurements - Summary of Terms and Fair value of the Company's Derivative Financial Instruments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureFinancialInstrumentsAndFairValueMeasurementsSummaryOfTermsAndFairValueOfTheCompanysDerivativeFinancialInstrumentsDetail</Role>
      <ShortName>Financial Instruments and Fair Value Measurements - Summary of Terms and Fair value of the Company's Derivative Financial Instruments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>996025 - Disclosure - Financial Instruments and Fair Value Measurements - Summary of Location in the Financial Statements of the Loss Recognized on Interest Rate Swaps Designated as Cash Flow Hedges (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureFinancialInstrumentsAndFairValueMeasurementsSummaryOfLocationInTheFinancialStatementsOfTheLossRecognizedOnInterestRateSwapsDes</Role>
      <ShortName>Financial Instruments and Fair Value Measurements - Summary of Location in the Financial Statements of the Loss Recognized on Interest Rate Swaps Designated as Cash Flow Hedges (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>996035 - Disclosure - Commitments and Contingencies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetail</Role>
      <ShortName>Commitments and Contingencies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>996045 - Disclosure - Accumulate Other Comprehensive (Loss) Income - Changes in Accumulated OCI by Component (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureAccumulateOtherComprehensiveLossIncomeChangesInAccumulatedOciByComponentDetail</Role>
      <ShortName>Accumulate Other Comprehensive (Loss) Income - Changes in Accumulated OCI by Component (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>996075 - Disclosure - Stock-Based Compensation and Employee Benefits - Schedule of Awards Granted (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureStockbasedCompensationAndEmployeeBenefitsScheduleOfAwardsGrantedDetail</Role>
      <ShortName>Stock-Based Compensation and Employee Benefits - Schedule of Awards Granted (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>996085 - Disclosure - Stock-Based Compensation and Employee Benefits - Schedule of Awards Granted (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureStockbasedCompensationAndEmployeeBenefitsScheduleOfAwardsGrantedParentheticalDetail</Role>
      <ShortName>Stock-Based Compensation and Employee Benefits - Schedule of Awards Granted (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>996095 - Disclosure - Stock-Based Compensation and Employee Benefits - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureStockbasedCompensationAndEmployeeBenefitsAdditionalInformationDetail</Role>
      <ShortName>Stock-Based Compensation and Employee Benefits - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>996105 - Disclosure - Stock-Based Compensation and Employee Benefits - Schedule of Fair Value Assumptions of Performance-Based Equity Awards (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureStockbasedCompensationAndEmployeeBenefitsScheduleOfFairValueAssumptionsOfPerformancebasedEquityAwardsDetail</Role>
      <ShortName>Stock-Based Compensation and Employee Benefits - Schedule of Fair Value Assumptions of Performance-Based Equity Awards (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>996115 - Disclosure - Stock-Based Compensation and Employee Benefits - Activities for Unvested Restricted Stock Awards (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureStockbasedCompensationAndEmployeeBenefitsActivitiesForUnvestedRestrictedStockAwardsDetail</Role>
      <ShortName>Stock-Based Compensation and Employee Benefits - Activities for Unvested Restricted Stock Awards (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>996125 - Disclosure - Stock-Based Compensation and Employee Benefits - Summary of Non-Cash Compensation Expense (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureStockbasedCompensationAndEmployeeBenefitsSummaryOfNoncashCompensationExpenseDetail</Role>
      <ShortName>Stock-Based Compensation and Employee Benefits - Summary of Non-Cash Compensation Expense (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996135 - Disclosure - Equity and Non-Controlling Interests - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureEquityAndNoncontrollingInterestsAdditionalInformationDetail</Role>
      <ShortName>Equity and Non-Controlling Interests - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996145 - Disclosure - Earnings Per Share - Reconciliation of Net Income (Loss) and Number of Common Shares Used in Computations of "Basic" EPS and "Diluted" EPS (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureEarningsPerShareReconciliationOfNetIncomeLossAndNumberOfCommonSharesUsedInComputationsOfBasicEPSAndDilutedEPSDetail</Role>
      <ShortName>Earnings Per Share - Reconciliation of Net Income (Loss) and Number of Common Shares Used in Computations of "Basic" EPS and "Diluted" EPS (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996155 - Disclosure - Earnings Per Share - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureEarningsPerShareAdditionalInformationDetail</Role>
      <ShortName>Earnings Per Share - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996165 - Disclosure - Agreements and Transactions with SITE Centers - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureAgreementsAndTransactionsWithSiteCentersAdditionalInformationDetail</Role>
      <ShortName>Agreements and Transactions with SITE Centers - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996175 - Disclosure - Income Taxes - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetail</Role>
      <ShortName>Income Taxes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996185 - Disclosure - Income Taxes - Reconciliation of GAAP Net Income (Loss) Attributable to Taxable Income (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxesReconciliationOfGAAPNetIncomeLossAttributableToTaxableIncomeDetail</Role>
      <ShortName>Income Taxes - Reconciliation of GAAP Net Income (Loss) Attributable to Taxable Income (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996195 - Disclosure - Income Taxes - Reconciliation of GAAP Net Income (Loss) Attributable to Taxable Income (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxesReconciliationOfGAAPNetIncomeLossAttributableToTaxableIncomeParentheticalDetail</Role>
      <ShortName>Income Taxes - Reconciliation of GAAP Net Income (Loss) Attributable to Taxable Income (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996205 - Disclosure - Income Taxes - Schedule of Taxability of Distribution (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureIncomeTaxesScheduleOfTaxabilityOfDistributionDetail</Role>
      <ShortName>Income Taxes - Schedule of Taxability of Distribution (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996215 - Disclosure - Subsequent Events - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/DisclosureSubsequentEventsAdditionalInformationDetail</Role>
      <ShortName>Subsequent Events - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996225 - Disclosure - Valuation and Qualifying Accounts and Reserves (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureValuationAndQualifyingAccountsAndReservesDetail</Role>
      <ShortName>Valuation and Qualifying Accounts and Reserves (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996235 - Disclosure - Real Estate and Accumulated Depreciation (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureRealEstateAndAccumulatedDepreciationDetail</Role>
      <ShortName>Real Estate and Accumulated Depreciation (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="curb-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996245 - Disclosure - Real Estate and Accumulated Depreciation (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://curbline.com/20251231/taxonomy/role/Role_DisclosureRealEstateAndAccumulatedDepreciationParentheticalDetail</Role>
      <ShortName>Real Estate and Accumulated Depreciation (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</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-K" isDefinitelyFs="true" isUsgaap="true" original="curb-20251231.htm">curb-20251231.htm</File>
    <File>curb-20251231.xsd</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="180">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="2049">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="12">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="39">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>
