<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.20.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>211</ContextCount>
  <ElementCount>328</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>32</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001001 - Document - DOCUMENT AND ENTITY INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/DOCUMENTANDENTITYINFORMATION</Role>
      <ShortName>DOCUMENT AND ENTITY INFORMATION</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001002 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/CONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1002003 - Statement - CONSOLIDATED BALANCE SHEETS (PARENTHETICAL)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/CONSOLIDATEDBALANCESHEETSPARENTHETICAL</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (PARENTHETICAL)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1003004 - Statement - Statement of Income (Statement)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/StatementofIncomeStatement</Role>
      <ShortName>Statement of Income (Statement)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1004005 - Statement - Consolidated Statements of Comprehensive Income (Loss) Statement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/ConsolidatedStatementsofComprehensiveIncomeLossStatement</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Loss) Statement</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1005006 - Statement - CONSOLIDATED STATEMENT OF STOCKHOLDERS EQUITY Statement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/CONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITYStatement</Role>
      <ShortName>CONSOLIDATED STATEMENT OF STOCKHOLDERS EQUITY Statement</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1006007 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2101101 - Disclosure - ORGANIZATION AND PRINCIPAL ACTIVITIES (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.diceholdingsinc.com/role/ORGANIZATIONANDPRINCIPALACTIVITIESNotes</Role>
      <ShortName>ORGANIZATION AND PRINCIPAL ACTIVITIES (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2104102 - Disclosure - SIGNIFCANT ACCOUNTING POLICIES (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.diceholdingsinc.com/role/SIGNIFCANTACCOUNTINGPOLICIESNotes</Role>
      <ShortName>SIGNIFCANT ACCOUNTING POLICIES (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2107103 - Disclosure - Revenue Recognition (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.diceholdingsinc.com/role/RevenueRecognitionNotes</Role>
      <ShortName>Revenue Recognition (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2113104 - Disclosure - SALE OF BUSINESS (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.diceholdingsinc.com/role/SALEOFBUSINESSNotes</Role>
      <ShortName>SALE OF BUSINESS (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2116105 - Disclosure - FAIR VALUE MEASUREMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/FAIRVALUEMEASUREMENTS</Role>
      <ShortName>FAIR VALUE MEASUREMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2119106 - Disclosure - INVESTMENTS (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.diceholdingsinc.com/role/INVESTMENTSNotes</Role>
      <ShortName>INVESTMENTS (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2121107 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/LEASES</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2127108 - Disclosure - ACQUIRED INTANGIBLE ASSETS, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/ACQUIREDINTANGIBLEASSETSNET</Role>
      <ShortName>ACQUIRED INTANGIBLE ASSETS, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2130109 - Disclosure - GOODWILL (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.diceholdingsinc.com/role/GOODWILLNotes</Role>
      <ShortName>GOODWILL (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2133110 - Disclosure - INDEBTEDNESS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/INDEBTEDNESS</Role>
      <ShortName>INDEBTEDNESS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2137111 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/COMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2140112 - Disclosure - EQUITY TRANSACTIONS (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.diceholdingsinc.com/role/EQUITYTRANSACTIONSNotes</Role>
      <ShortName>EQUITY TRANSACTIONS (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2143113 - Disclosure - DISPOSITION RELATED AND OTHER COSTS (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.diceholdingsinc.com/role/DISPOSITIONRELATEDANDOTHERCOSTSNotes</Role>
      <ShortName>DISPOSITION RELATED AND OTHER COSTS (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2146114 - Disclosure - STOCK BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/STOCKBASEDCOMPENSATION</Role>
      <ShortName>STOCK BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2153115 - Disclosure - SEGMENT INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/SEGMENTINFORMATION</Role>
      <ShortName>SEGMENT INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2156116 - Disclosure - EARNINGS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/EARNINGSPERSHARE</Role>
      <ShortName>EARNINGS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2159117 - Disclosure - INCOME TAXES (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.diceholdingsinc.com/role/INCOMETAXESNotes</Role>
      <ShortName>INCOME TAXES (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2308302 - Disclosure - Revenue Recognition (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/RevenueRecognitionTables</Role>
      <ShortName>Revenue Recognition (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/RevenueRecognitionNotes</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2322305 - Disclosure - LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/LEASESTables</Role>
      <ShortName>LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/LEASES</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2331307 - Disclosure - GOODWILL (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/GOODWILLTables</Role>
      <ShortName>GOODWILL (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/GOODWILLNotes</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2334308 - Disclosure - INDEBTEDNESS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/INDEBTEDNESSTables</Role>
      <ShortName>INDEBTEDNESS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/INDEBTEDNESS</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2341310 - Disclosure - EQUITY TRANSACTIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/EQUITYTRANSACTIONSTables</Role>
      <ShortName>EQUITY TRANSACTIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/EQUITYTRANSACTIONSNotes</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2344311 - Disclosure - DISPOSITION RELATED AND OTHER COSTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/DISPOSITIONRELATEDANDOTHERCOSTSTables</Role>
      <ShortName>DISPOSITION RELATED AND OTHER COSTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/DISPOSITIONRELATEDANDOTHERCOSTSNotes</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2347312 - Disclosure - STOCK BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/STOCKBASEDCOMPENSATIONTables</Role>
      <ShortName>STOCK BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/STOCKBASEDCOMPENSATION</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2354313 - Disclosure - SEGMENT INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/SEGMENTINFORMATIONTables</Role>
      <ShortName>SEGMENT INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/SEGMENTINFORMATION</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2357314 - Disclosure - EARNINGS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/EARNINGSPERSHARETables</Role>
      <ShortName>EARNINGS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/EARNINGSPERSHARE</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2410404 - Disclosure - Revenue Recognition - Disaggregated Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/RevenueRecognitionDisaggregatedRevenueDetails</Role>
      <ShortName>Revenue Recognition - Disaggregated Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2411405 - Disclosure - REVENUE RECOGNITION Revenue Recognition - Contract Balances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/REVENUERECOGNITIONRevenueRecognitionContractBalancesDetails</Role>
      <ShortName>REVENUE RECOGNITION Revenue Recognition - Contract Balances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2412406 - Disclosure - REVENUE RECOGNITION Revenue Recognition - Performance Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/REVENUERECOGNITIONRevenueRecognitionPerformanceObligationsDetails</Role>
      <ShortName>REVENUE RECOGNITION Revenue Recognition - Performance Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2415407 - Disclosure - SALE OF BUSINESS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/SALEOFBUSINESSDetails</Role>
      <ShortName>SALE OF BUSINESS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/SALEOFBUSINESSNotes</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2420409 - Disclosure - INVESTMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/INVESTMENTSDetails</Role>
      <ShortName>INVESTMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/INVESTMENTSNotes</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2423410 - Disclosure - LEASES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/LEASESDetails</Role>
      <ShortName>LEASES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/LEASESTables</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2424411 - Disclosure - LEASES (Lease Cost) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/LEASESLeaseCostDetails</Role>
      <ShortName>LEASES (Lease Cost) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/LEASESTables</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2425412 - Disclosure - LEASES (Supplemental Balance Sheet Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/LEASESSupplementalBalanceSheetInformationDetails</Role>
      <ShortName>LEASES (Supplemental Balance Sheet Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/LEASESTables</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2426413 - Disclosure - LEASES (Maturities of Lease Liabilities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/LEASESMaturitiesofLeaseLiabilitiesDetails</Role>
      <ShortName>LEASES (Maturities of Lease Liabilities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/LEASESTables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2429414 - Disclosure - ACQUIRED INTANGIBLE ASSETS, NET (Summary of Acquired Intangible Assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/ACQUIREDINTANGIBLEASSETSNETSummaryofAcquiredIntangibleAssetsDetails</Role>
      <ShortName>ACQUIRED INTANGIBLE ASSETS, NET (Summary of Acquired Intangible Assets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/ACQUIREDINTANGIBLEASSETSNET</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2432415 - Disclosure - GOODWILL (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/GOODWILLDetails</Role>
      <ShortName>GOODWILL (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/GOODWILLTables</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2435416 - Disclosure - INDEBTEDNESS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/INDEBTEDNESSDetails</Role>
      <ShortName>INDEBTEDNESS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/INDEBTEDNESSTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2436417 - Disclosure - INDEBTEDNESS (Schedule of Credit Agreement) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/INDEBTEDNESSScheduleofCreditAgreementDetails</Role>
      <ShortName>INDEBTEDNESS (Schedule of Credit Agreement) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/INDEBTEDNESSTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2439418 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/COMMITMENTSANDCONTINGENCIESDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/COMMITMENTSANDCONTINGENCIES</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2442419 - Disclosure - EQUITY TRANSACTIONS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/EQUITYTRANSACTIONSDetails</Role>
      <ShortName>EQUITY TRANSACTIONS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/EQUITYTRANSACTIONSTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2445420 - Disclosure - DISPOSITION RELATED AND OTHER COSTS Schedule of Restructuring Costs- Disposition (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/DISPOSITIONRELATEDANDOTHERCOSTSScheduleofRestructuringCostsDispositionDetails</Role>
      <ShortName>DISPOSITION RELATED AND OTHER COSTS Schedule of Restructuring Costs- Disposition (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2448421 - Disclosure - STOCK BASED COMPENSATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/STOCKBASEDCOMPENSATIONDetails</Role>
      <ShortName>STOCK BASED COMPENSATION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/STOCKBASEDCOMPENSATIONTables</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2449422 - Disclosure - STOCK BASED COMPENSATION (Status of Restricted Stock) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/STOCKBASEDCOMPENSATIONStatusofRestrictedStockDetails</Role>
      <ShortName>STOCK BASED COMPENSATION (Status of Restricted Stock) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/STOCKBASEDCOMPENSATIONTables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2450423 - Disclosure - STOCK BASED COMPENSATION Status of PSUs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/STOCKBASEDCOMPENSATIONStatusofPSUsDetails</Role>
      <ShortName>STOCK BASED COMPENSATION Status of PSUs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2451424 - Disclosure - STOCK BASED COMPENSATION (Summary of Status of Options) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/STOCKBASEDCOMPENSATIONSummaryofStatusofOptionsDetails</Role>
      <ShortName>STOCK BASED COMPENSATION (Summary of Status of Options) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/STOCKBASEDCOMPENSATIONTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2452425 - Disclosure - STOCK BASED COMPENSATION (Summary of Options Outstanding) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/STOCKBASEDCOMPENSATIONSummaryofOptionsOutstandingDetails</Role>
      <ShortName>STOCK BASED COMPENSATION (Summary of Options Outstanding) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/STOCKBASEDCOMPENSATIONTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2455426 - Disclosure - SEGMENT INFORMATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/SEGMENTINFORMATIONDetails</Role>
      <ShortName>SEGMENT INFORMATION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/SEGMENTINFORMATIONTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2458427 - Disclosure - EARNINGS PER SHARE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/EARNINGSPERSHAREDetails</Role>
      <ShortName>EARNINGS PER SHARE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/EARNINGSPERSHARETables</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2462428 - Disclosure - INCOME TAXES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.diceholdingsinc.com/role/INCOMETAXESDetails</Role>
      <ShortName>INCOME TAXES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.diceholdingsinc.com/role/INCOMETAXESNotes</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="dhx-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9999.htm</HtmlFileName>
      <LongName>Uncategorized Items - dhx-20200930.htm</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/role/uncategorizedFacts</Role>
      <ShortName>Uncategorized Items - dhx-20200930.htm</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" original="dhx-20200930.htm">dhx-20200930.htm</File>
    <File>dhx-20200930.xsd</File>
    <File>dhx-20200930_cal.xml</File>
    <File>dhx-20200930_def.xml</File>
    <File>dhx-20200930_lab.xml</File>
    <File>dhx-20200930_pre.xml</File>
    <File>q32020311certification.htm</File>
    <File>q32020312certification.htm</File>
    <File>q32020321certification.htm</File>
    <File>q32020322certification.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/srt/2020-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/country/2020-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2020-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/us-gaap/2020-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
