<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>344</ContextCount>
  <ElementCount>550</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>91</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_StatementConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100030 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_StatementConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100040 - Statement - Consolidated Statements of Income (Loss) and Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/StatementConsolidatedStatementsOfIncomeLossAndComprehensiveIncomeLoss</Role>
      <ShortName>Consolidated Statements of Income (Loss) and Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100050 - Statement - Consolidated Statements of Income (Loss) and Comprehensive Income (Loss) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/StatementConsolidatedStatementsOfIncomeLossAndComprehensiveIncomeLossParenthetical</Role>
      <ShortName>Consolidated Statements of Income (Loss) and Comprehensive Income (Loss) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100060 - Statement - Consolidated Statements of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_StatementConsolidatedStatementsOfStockholdersEquity</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100070 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ttgt-20241231.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="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995440 - Disclosure - Recovery of Erroneously Awarded Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/ErrCompDisclosure</Role>
      <ShortName>Recovery of Erroneously Awarded Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.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>10</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995450 - Disclosure - Business Overview and Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessOverviewAndBasisOfPresentation1</Role>
      <ShortName>Business Overview and Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995457 - Disclosure - Cybersecurity Risk Management, Strategy, and Governance</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureCybersecurityRiskManagementStrategyAndGovernance</Role>
      <ShortName>Cybersecurity Risk Management, Strategy, and Governance</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995460 - Disclosure - Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSignificantAccountingPolicies1</Role>
      <ShortName>Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995470 - Disclosure - Revenues</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRevenues</Role>
      <ShortName>Revenues</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995480 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_DisclosureFairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995490 - Disclosure - Business Combinations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessCombinations</Role>
      <ShortName>Business Combinations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995510 - Disclosure - Goodwill and Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureGoodwillAndIntangibleAssets</Role>
      <ShortName>Goodwill and Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995530 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureLeases3</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995540 - Disclosure - Property and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosurePropertyAndEquipment</Role>
      <ShortName>Property and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Convertible Notes and Credit Facility</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureConvertibleNotesAndCreditFacility</Role>
      <ShortName>Convertible Notes and Credit Facility</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995560 - Disclosure - Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensation</Role>
      <ShortName>Stock-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995580 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995590 - Disclosure - Post-retirement and Other Employee Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosurePostretirementAndOtherEmployeeBenefits</Role>
      <ShortName>Post-retirement and Other Employee Benefits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995600 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995610 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureCommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995620 - Disclosure - Segments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSegments1</Role>
      <ShortName>Segments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995630 - Disclosure - Quarterly Results (unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureQuarterlyResultsUnaudited1</Role>
      <ShortName>Quarterly Results (unaudited)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995640 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995650 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSignificantAccountingPolicies1</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995660 - Disclosure - Business Overview and Basis of Presentation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessOverviewAndBasisOfPresentationTables</Role>
      <ShortName>Business Overview and Basis of Presentation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessOverviewAndBasisOfPresentation1</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995670 - Disclosure - Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSignificantAccountingPoliciesTables</Role>
      <ShortName>Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSignificantAccountingPolicies1</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995680 - Disclosure - Revenues (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRevenuesTables</Role>
      <ShortName>Revenues (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRevenues</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995690 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureFairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/Role_DisclosureFairValueMeasurements</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995700 - Disclosure - Business Combinations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessCombinationsTables</Role>
      <ShortName>Business Combinations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessCombinations</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995720 - Disclosure - Goodwill and Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsTables</Role>
      <ShortName>Goodwill and Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureGoodwillAndIntangibleAssets</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995730 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureLeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureLeases3</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995740 - Disclosure - Property and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosurePropertyAndEquipmentTables</Role>
      <ShortName>Property and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosurePropertyAndEquipment</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995750 - Disclosure - Convertible Notes and Credit Facility (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureConvertibleNotesAndCreditFacilityTables</Role>
      <ShortName>Convertible Notes and Credit Facility (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureConvertibleNotesAndCreditFacility</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995760 - Disclosure - Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationTables</Role>
      <ShortName>Stock-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensation</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995770 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxes</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995790 - Disclosure - Related Party Transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRelatedPartyTransactionsTables</Role>
      <ShortName>Related Party Transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRelatedPartyTransactions</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995800 - Disclosure - Quarterly Results (unaudited) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureQuarterlyResultsUnauditedTables</Role>
      <ShortName>Quarterly Results (unaudited) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureQuarterlyResultsUnaudited1</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995810 - Disclosure - Business Overview and Basis of Presentation - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessOverviewAndBasisOfPresentationAdditionalInformationDetail</Role>
      <ShortName>Business Overview and Basis of Presentation - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995820 - Disclosure - Business Overview and Basis of Presentation - Summary of Effect of Restatement on Business's Previously Reported Consolidated Balance Sheets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessOverviewAndBasisOfPresentationSummaryOfEffectOfRestatementOnBusinesssPreviouslyReportedConsolidatedBalanceSheetsDetails</Role>
      <ShortName>Business Overview and Basis of Presentation - Summary of Effect of Restatement on Business's Previously Reported Consolidated Balance Sheets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995830 - Disclosure - Business Overview and Basis of Presentation - Summary of Effect of Restatement on Business's Previously Reported Consolidated Balance Sheets (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessOverviewAndBasisOfPresentationSummaryOfEffectOfRestatementOnBusinesssPreviouslyReportedConsolidatedBalanceSheetsParenthet</Role>
      <ShortName>Business Overview and Basis of Presentation - Summary of Effect of Restatement on Business's Previously Reported Consolidated Balance Sheets (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995840 - Disclosure - Business Overview and Basis of Presentation - Summary of Effect of Restatement on Informa Intrepid Holdings Inc. Previously Reported Consolidated Statements of Income (loss) and Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessOverviewAndBasisOfPresentationSummaryOfEffectOfRestatementOnInformaIntrepidHoldingsIncPreviouslyReportedConsolidatedStat</Role>
      <ShortName>Business Overview and Basis of Presentation - Summary of Effect of Restatement on Informa Intrepid Holdings Inc. Previously Reported Consolidated Statements of Income (loss) and Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995850 - Disclosure - Business Overview and Basis of Presentation - Summary of Effect of Restatement on Predecessor's Previously Reported Consolidated Statements of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessOverviewAndBasisOfPresentationSummaryOfEffectOfRestatementOnPredecessorsPreviouslyReportedConsolidatedStatementsOfCashFl</Role>
      <ShortName>Business Overview and Basis of Presentation - Summary of Effect of Restatement on Predecessor's Previously Reported Consolidated Statements of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995860 - Disclosure - Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSignificantAccountingPoliciesAdditionalInformationDetail</Role>
      <ShortName>Significant Accounting Policies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995870 - Disclosure - Significant Accounting Policies - Summary of Estimated Useful Lives of Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSignificantAccountingPoliciesSummaryOfEstimatedUsefulLivesOfIntangibleAssetsDetails</Role>
      <ShortName>Significant Accounting Policies - Summary of Estimated Useful Lives of Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995880 - Disclosure - Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSignificantAccountingPoliciesEstimatedUsefulLivesOfPropertyAndEquipmentDetail</Role>
      <ShortName>Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995890 - Disclosure - Significant Accounting Policies - Summary of Changes in Allowance for Credit Losses (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSignificantAccountingPoliciesSummaryOfChangesInAllowanceForCreditLossesDetail</Role>
      <ShortName>Significant Accounting Policies - Summary of Changes in Allowance for Credit Losses (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995900 - Disclosure - Significant Accounting Policies - Schedule of Calculations of Basic And Diluted Net Income (Loss) Per Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSignificantAccountingPoliciesScheduleOfCalculationsOfBasicAndDilutedNetIncomeLossPerShareDetail</Role>
      <ShortName>Significant Accounting Policies - Schedule of Calculations of Basic And Diluted Net Income (Loss) Per Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995910 - Disclosure - Revenues - Disaggregated Revenue (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRevenuesDisaggregatedRevenueDetail</Role>
      <ShortName>Revenues - Disaggregated Revenue (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995920 - Disclosure - Revenues - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRevenuesAdditionalInformationDetail</Role>
      <ShortName>Revenues - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995930 - Disclosure - Revenues - Revenues by Geographic Area (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRevenuesRevenuesByGeographicAreaDetails</Role>
      <ShortName>Revenues - Revenues by Geographic Area (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>995940 - Disclosure - Revenues - Revenues by Geographic Area (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRevenuesRevenuesByGeographicAreaParentheticalDetails</Role>
      <ShortName>Revenues - Revenues by Geographic Area (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>995950 - Disclosure - Revenues - Long-Lived Assets by Geographic Area (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRevenuesLonglivedAssetsByGeographicAreaDetails</Role>
      <ShortName>Revenues - Long-Lived Assets by Geographic Area (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>995970 - Disclosure - Fair Value Measurements - Assets and Liabilities Carried at Fair Value and Measured on Recurring Basis (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureFairValueMeasurementsAssetsAndLiabilitiesCarriedAtFairValueAndMeasuredOnRecurringBasisDetail</Role>
      <ShortName>Fair Value Measurements - Assets and Liabilities Carried at Fair Value and Measured on Recurring Basis (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>995980 - Disclosure - Fair Value Measurements - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureFairValueMeasurementsAdditionalInformationDetail</Role>
      <ShortName>Fair Value Measurements - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>995990 - Disclosure - Fair Value Measurements - Fair Value of Contingent Consideration Categorized as Level 3 (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureFairValueMeasurementsFairValueOfContingentConsiderationCategorizedAsLevel3Detail</Role>
      <ShortName>Fair Value Measurements - Fair Value of Contingent Consideration Categorized as Level 3 (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>996000 - Disclosure - Business Combinations - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessCombinationsAdditionalInformationDetail</Role>
      <ShortName>Business Combinations - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996010 - Disclosure - Business Combinations - Summary of Total Purchase Price Paid/Fair Value of Cash and Contingent Consideration Transferred (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessCombinationsSummaryOfTotalPurchasePricePaidfairValueOfCashAndContingentConsiderationTransferredDetail</Role>
      <ShortName>Business Combinations - Summary of Total Purchase Price Paid/Fair Value of Cash and Contingent Consideration Transferred (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996030 - Disclosure - Business Combinations - Summary of Total Purchase Price Paid/Fair Value of Cash and Contingent Consideration Transferred (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessCombinationsSummaryOfTotalPurchasePricePaidfairValueOfCashAndContingentConsiderationTransferredParentheticalDetail</Role>
      <ShortName>Business Combinations - Summary of Total Purchase Price Paid/Fair Value of Cash and Contingent Consideration Transferred (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996040 - Disclosure - Business Combinations - Summary of Allocation Purchase Price to The Fair Values of Assets Acquired and Liabilities Assumed (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessCombinationsSummaryOfAllocationPurchasePriceToTheFairValuesOfAssetsAcquiredAndLiabilitiesAssumedDetail</Role>
      <ShortName>Business Combinations - Summary of Allocation Purchase Price to The Fair Values of Assets Acquired and Liabilities Assumed (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996050 - Disclosure - Business Combinations - Summary of Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessCombinationsSummaryOfAllocationOfAcquiredIntangibleAssetsAndRelatedEstimatesOfUsefulLivesDetail</Role>
      <ShortName>Business Combinations - Summary of Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996060 - Disclosure - Business Combinations - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessCombinationsSummaryOfFairValueOfAssetsAcquiredAndLiabilitiesAssumedDetail</Role>
      <ShortName>Business Combinations - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996070 - Disclosure - Business Combinations - Schedule of Unaudited Pro Forma Financial Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureBusinessCombinationsScheduleOfUnauditedProFormaFinancialInformationDetail</Role>
      <ShortName>Business Combinations - Schedule of Unaudited Pro Forma Financial Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996080 - Disclosure - Goodwill and Intangible Assets - Schedule of Goodwill Balances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsScheduleOfGoodwillBalancesDetails</Role>
      <ShortName>Goodwill and Intangible Assets - Schedule of Goodwill Balances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996090 - Disclosure - Goodwill and Intangible Assets - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail</Role>
      <ShortName>Goodwill and Intangible Assets - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996100 - Disclosure - Goodwill and Intangible Assets - Schedule of Intangible Assets Subject to Amortization (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsScheduleOfIntangibleAssetsSubjectToAmortizationDetails</Role>
      <ShortName>Goodwill and Intangible Assets - Schedule of Intangible Assets Subject to Amortization (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996110 - Disclosure - Goodwill and Intangible Assets - Schedule of Future Expected Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsScheduleOfFutureExpectedAmortizationExpenseDetails</Role>
      <ShortName>Goodwill and Intangible Assets - Schedule of Future Expected Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996140 - Disclosure - Leases - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureLeasesAdditionalInformationDetail</Role>
      <ShortName>Leases - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996150 - Disclosure - Leases - Summary of Operating Lease Included Combined Balance Sheet (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureLeasesSummaryOfOperatingLeaseIncludedCombinedBalanceSheetDetail</Role>
      <ShortName>Leases - Summary of Operating Lease Included Combined Balance Sheet (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>996160 - Disclosure - Leases - Summary of Lessee Operating Lease Term and Discount Rate (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureLeasesSummaryOfLesseeOperatingLeaseTermAndDiscountRateDetail</Role>
      <ShortName>Leases - Summary of Lessee Operating Lease Term and Discount Rate (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>996170 - Disclosure - Leases - Summary of Remaining Maturities of Lease Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureLeasesSummaryOfRemainingMaturitiesOfLeaseLiabilitiesDetail</Role>
      <ShortName>Leases - Summary of Remaining Maturities of Lease Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>996180 - Disclosure - Property and Equipment - Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosurePropertyAndEquipmentPropertyAndEquipmentDetails</Role>
      <ShortName>Property and Equipment - Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>996190 - Disclosure - Property and Equipment (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetails</Role>
      <ShortName>Property and Equipment (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosurePropertyAndEquipmentTables</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>996200 - Disclosure - Convertible Notes and Credit Facility - Additional Information (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureConvertibleNotesAndCreditFacilityAdditionalInformationDetail</Role>
      <ShortName>Convertible Notes and Credit Facility - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>996210 - Disclosure - Convertible Notes and Credit Facility - Schedule of Convertible Notes (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureConvertibleNotesAndCreditFacilityScheduleOfConvertibleNotesDetail</Role>
      <ShortName>Convertible Notes and Credit Facility - Schedule of Convertible Notes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>996220 - Disclosure - Convertible Notes and Credit Facility - Schedule of Contractual Maturities of Notes (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureConvertibleNotesAndCreditFacilityScheduleOfContractualMaturitiesOfNotesDetail</Role>
      <ShortName>Convertible Notes and Credit Facility - Schedule of Contractual Maturities of Notes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>996230 - Disclosure - Convertible Notes and Credit Facility - Summary Of Fair Value Of The Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureConvertibleNotesAndCreditFacilitySummaryOfFairValueOfTheNotesDetails</Role>
      <ShortName>Convertible Notes and Credit Facility - Summary Of Fair Value Of The Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>996240 - Disclosure - Stock-Based Compensation - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationAdditionalInformationDetail</Role>
      <ShortName>Stock-Based Compensation - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>996270 - Disclosure - Stock-Based Compensation - Summary of Restricted Stock Unit Award Activity Under Company's Plans (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationSummaryOfRestrictedStockUnitAwardActivityUnderCompanySPlansDetail</Role>
      <ShortName>Stock-Based Compensation - Summary of Restricted Stock Unit Award Activity Under Company's Plans (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>996300 - Disclosure - Income Taxes - Schedule of Loss Before Income Tax Benefit (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureIncomeTaxesScheduleOfLossBeforeIncomeTaxBenefitDetail</Role>
      <ShortName>Income Taxes - Schedule of Loss Before Income Tax Benefit (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>996310 - Disclosure - Income Taxes - Schedule of Income Tax Benefit (Provision) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureIncomeTaxesScheduleOfIncomeTaxBenefitProvisionDetail</Role>
      <ShortName>Income Taxes - Schedule of Income Tax Benefit (Provision) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>996320 - Disclosure - Income Taxes - Difference by Applying the Statutory Federal Income Tax Rate (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesDifferenceByApplyingStatutoryFederalIncomeTaxRateDetail</Role>
      <ShortName>Income Taxes - Difference by Applying the Statutory Federal Income Tax Rate (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>996330 - Disclosure - Income Taxes - Schedule of Significant Components of Company's Net Deferred Tax Assets and Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureIncomeTaxesScheduleOfSignificantComponentsOfCompanysNetDeferredTaxAssetsAndLiabilitiesDetail</Role>
      <ShortName>Income Taxes - Schedule of Significant Components of Company's Net Deferred Tax Assets and Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>996340 - Disclosure - Income Taxes - Summary of Valuation Allowance against Deferred Tax Asset (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureIncomeTaxesSummaryOfValuationAllowanceAgainstDeferredTaxAssetDetails</Role>
      <ShortName>Income Taxes - Summary of Valuation Allowance against Deferred Tax Asset (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>996350 - Disclosure - Income Taxes - Schedule of Unrecognized Tax Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureIncomeTaxesScheduleOfUnrecognizedTaxBenefitsDetails</Role>
      <ShortName>Income Taxes - Schedule of Unrecognized Tax Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>996360 - Disclosure - Income Taxes - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetail</Role>
      <ShortName>Income Taxes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>996370 - Disclosure - Post-retirement and Other Employee Benefits - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosurePostretirementAndOtherEmployeeBenefitsAdditionalInformationDetail</Role>
      <ShortName>Post-retirement and Other Employee Benefits - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>996380 - Disclosure - Related Party Transactions - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails</Role>
      <ShortName>Related Party Transactions - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>996390 - Disclosure - Related Party Transactions - Schedule of Related Party Transactions Related to Debt Financing (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRelatedPartyTransactionsScheduleOfRelatedPartyTransactionsRelatedToDebtFinancingDetails</Role>
      <ShortName>Related Party Transactions - Schedule of Related Party Transactions Related to Debt Financing (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>996400 - Disclosure - Related Party Transactions - Schedule of Related Party Transactions Related to Cash Pooling Arrangements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRelatedPartyTransactionsScheduleOfRelatedPartyTransactionsRelatedToCashPoolingArrangementsDetails</Role>
      <ShortName>Related Party Transactions - Schedule of Related Party Transactions Related to Cash Pooling Arrangements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>996410 - Disclosure - Related Party Transactions - Schedule of Related Party Transactions Related to Interest Income and Interest Expense on Related Party Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRelatedPartyTransactionsScheduleOfRelatedPartyTransactionsRelatedToInterestIncomeAndInterestExpenseOnRelatedPartyDebtDetails</Role>
      <ShortName>Related Party Transactions - Schedule of Related Party Transactions Related to Interest Income and Interest Expense on Related Party Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>996420 - Disclosure - Related Party Transactions - Schedule of Related Party Transactions Related to Related Party Receivables and Payables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureRelatedPartyTransactionsScheduleOfRelatedPartyTransactionsRelatedToRelatedPartyReceivablesAndPayablesDetails</Role>
      <ShortName>Related Party Transactions - Schedule of Related Party Transactions Related to Related Party Receivables and Payables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>996430 - Disclosure - Segments - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSegmentsAdditionalInformationDetail</Role>
      <ShortName>Segments - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>996450 - Disclosure - Quarterly Results (unaudited) - Summary of Selected Unaudited Condensed Combined Statements of Income (Loss) and Total comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureQuarterlyResultsUnauditedSummaryOfSelectedUnauditedCondensedCombinedStatementsOfIncomeLossAndTotalComprehensiveIncomeLossDetails</Role>
      <ShortName>Quarterly Results (unaudited) - Summary of Selected Unaudited Condensed Combined Statements of Income (Loss) and Total comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureQuarterlyResultsUnauditedTables</ParentRole>
      <Position>99</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>996460 - Disclosure - Quarterly Results (unaudited) - Summary of Selected Unaudited Combined Statements of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureQuarterlyResultsUnauditedSummaryOfSelectedUnauditedCombinedStatementsOfCashFlowsDetails</Role>
      <ShortName>Quarterly Results (unaudited) - Summary of Selected Unaudited Combined Statements of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureQuarterlyResultsUnauditedTables</ParentRole>
      <Position>100</Position>
    </Report>
    <Report instance="ttgt-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>996470 - Disclosure - Subsequent Event - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.informatechtarget.com/20241231/taxonomy/role/DisclosureSubsequentEventAdditionalInformationDetail</Role>
      <ShortName>Subsequent Event - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</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="ttgt-20241231.htm">ttgt-20241231.htm</File>
    <File>ttgt-20241231.xsd</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img110923679_0.jpg</File>
    <File>img110923679_1.jpg</File>
    <File>img110923679_2.jpg</File>
    <File>img110923679_3.jpg</File>
    <File>img110923679_4.jpg</File>
    <File>img110923679_5.jpg</File>
    <File>img110923679_6.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="2">http://fasb.org/srt/2024</BaseTaxonomy>
    <BaseTaxonomy items="1791">http://fasb.org/us-gaap/2024</BaseTaxonomy>
    <BaseTaxonomy items="14">http://xbrl.sec.gov/cyd/2024</BaseTaxonomy>
    <BaseTaxonomy items="42">http://xbrl.sec.gov/dei/2024</BaseTaxonomy>
    <BaseTaxonomy items="8">http://xbrl.sec.gov/ecd/2024</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
