<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.23.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>3839</ContextCount>
  <ElementCount>369</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>468</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>13</UnitCount>
  <MyReports>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Statement - CONSOLIDATED BALANCE SHEET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/CONSOLIDATEDBALANCESHEET</Role>
      <ShortName>CONSOLIDATED BALANCE SHEET</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0000003 - Statement - CONSOLIDATED BALANCE SHEET (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/CONSOLIDATEDBALANCESHEETParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEET (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0000004 - Statement - CONSOLIDATED STATEMENT OF OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/CONSOLIDATEDSTATEMENTOFOPERATIONS</Role>
      <ShortName>CONSOLIDATED STATEMENT OF OPERATIONS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0000005 - Statement - CONSOLIDATED SCHEDULE OF INVESTMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/CONSOLIDATEDSCHEDULEOFINVESTMENTS</Role>
      <ShortName>CONSOLIDATED SCHEDULE OF INVESTMENTS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0000006 - Statement - CONSOLIDATED SCHEDULE OF INVESTMENTS - (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/CONSOLIDATEDSCHEDULEOFINVESTMENTSParenthetical</Role>
      <ShortName>CONSOLIDATED SCHEDULE OF INVESTMENTS - (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0000007 - Statement - CONSOLIDATED STATEMENT OF STOCKHOLDERS??? EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/CONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENT OF STOCKHOLDERS??? EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0000008 - Statement - CONSOLIDATED STATEMENT OF STOCKHOLDERS??? EQUITY (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/CONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITYParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENT OF STOCKHOLDERS??? EQUITY (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0000009 - Statement - CONSOLIDATED STATEMENT OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/CONSOLIDATEDSTATEMENTOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENT OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0000010 - Disclosure - ORGANIZATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/ORGANIZATION</Role>
      <ShortName>ORGANIZATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>0000011 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/SIGNIFICANTACCOUNTINGPOLICIES</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0000012 - Disclosure - AGREEMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/AGREEMENTS</Role>
      <ShortName>AGREEMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0000013 - Disclosure - INVESTMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTS</Role>
      <ShortName>INVESTMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0000014 - Disclosure - DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DEBT</Role>
      <ShortName>DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>0000015 - Disclosure - DERIVATIVE INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DERIVATIVEINSTRUMENTS</Role>
      <ShortName>DERIVATIVE INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>0000016 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/COMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>0000017 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTS</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>0000018 - Disclosure - STOCKHOLDERS??? EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/STOCKHOLDERSEQUITY</Role>
      <ShortName>STOCKHOLDERS??? EQUITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>0000019 - Disclosure - EARNINGS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/EARNINGSPERSHARE</Role>
      <ShortName>EARNINGS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>0000020 - Disclosure - DIVIDENDS AND DISTRIBUTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DIVIDENDSANDDISTRIBUTIONS</Role>
      <ShortName>DIVIDENDS AND DISTRIBUTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>0000021 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/RELATEDPARTYTRANSACTIONS</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>0000022 - Disclosure - FINANCIAL HIGHLIGHTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/FINANCIALHIGHLIGHTS</Role>
      <ShortName>FINANCIAL HIGHLIGHTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>0000023 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/SUBSEQUENTEVENTS</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995470 - Disclosure - N-2</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cef/role/N2</Role>
      <ShortName>N-2</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9954701 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/SIGNIFICANTACCOUNTINGPOLICIESPolicies</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9954702 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/SIGNIFICANTACCOUNTINGPOLICIESTables</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/SIGNIFICANTACCOUNTINGPOLICIES</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9954703 - Disclosure - AGREEMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/AGREEMENTSTables</Role>
      <ShortName>AGREEMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/AGREEMENTS</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9954704 - Disclosure - INVESTMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTSTables</Role>
      <ShortName>INVESTMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/INVESTMENTS</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9954705 - Disclosure - DEBT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DEBTTables</Role>
      <ShortName>DEBT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/DEBT</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9954706 - Disclosure - DERIVATIVE INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DERIVATIVEINSTRUMENTSTables</Role>
      <ShortName>DERIVATIVE INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/DERIVATIVEINSTRUMENTS</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9954707 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/COMMITMENTSANDCONTINGENCIESTables</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/COMMITMENTSANDCONTINGENCIES</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9954708 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSTables</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTS</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9954709 - Disclosure - STOCKHOLDERS??? EQUITY (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/STOCKHOLDERSEQUITYTables</Role>
      <ShortName>STOCKHOLDERS??? EQUITY (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/STOCKHOLDERSEQUITY</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9954710 - Disclosure - EARNINGS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/EARNINGSPERSHARETables</Role>
      <ShortName>EARNINGS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/EARNINGSPERSHARE</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9954711 - Disclosure - DIVIDENDS AND DISTRIBUTIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DIVIDENDSANDDISTRIBUTIONSTables</Role>
      <ShortName>DIVIDENDS AND DISTRIBUTIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/DIVIDENDSANDDISTRIBUTIONS</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9954712 - Disclosure - FINANCIAL HIGHLIGHTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/FINANCIALHIGHLIGHTSTables</Role>
      <ShortName>FINANCIAL HIGHLIGHTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/FINANCIALHIGHLIGHTS</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9954713 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/SIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9954714 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/SIGNIFICANTACCOUNTINGPOLICIESReconciliationofCashCashEquivalentsandRestrictedCashDetails</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9954715 - Disclosure - AGREEMENTS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/AGREEMENTSNarrativeDetails</Role>
      <ShortName>AGREEMENTS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9954716 - Disclosure - AGREEMENTS - Schedule of Base Management Fees, Income Based Fees, and Capital Gains Incentive Fees (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/AGREEMENTSScheduleofBaseManagementFeesIncomeBasedFeesandCapitalGainsIncentiveFeesDetails</Role>
      <ShortName>AGREEMENTS - Schedule of Base Management Fees, Income Based Fees, and Capital Gains Incentive Fees (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9954717 - Disclosure - INVESTMENTS - Schedule of Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTSScheduleofInvestmentsDetails</Role>
      <ShortName>INVESTMENTS - Schedule of Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9954718 - Disclosure - INVESTMENTS - Senior Direct Lending Program (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTSSeniorDirectLendingProgramDetails</Role>
      <ShortName>INVESTMENTS - Senior Direct Lending Program (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9954719 - Disclosure - INVESTMENTS - Summary of Funded Capital and Unfunded Capital Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTSSummaryofFundedCapitalandUnfundedCapitalCommitmentsDetails</Role>
      <ShortName>INVESTMENTS - Summary of Funded Capital and Unfunded Capital Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9954720 - Disclosure - INVESTMENTS - Interest Income and Capital Structuring Service and Other Fees Earned (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTSInterestIncomeandCapitalStructuringServiceandOtherFeesEarnedDetails</Role>
      <ShortName>INVESTMENTS - Interest Income and Capital Structuring Service and Other Fees Earned (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9954721 - Disclosure - INVESTMENTS - Summary of the SDLP Portfolio (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTSSummaryoftheSDLPPortfolioDetails</Role>
      <ShortName>INVESTMENTS - Summary of the SDLP Portfolio (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9954722 - Disclosure - INVESTMENTS - Selected Financial Information for the SLDP (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTSSelectedFinancialInformationfortheSLDPDetails</Role>
      <ShortName>INVESTMENTS - Selected Financial Information for the SLDP (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9954723 - Disclosure - INVESTMENTS - Ivy Hill Asset Management, L.P. (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTSIvyHillAssetManagementLPDetails</Role>
      <ShortName>INVESTMENTS - Ivy Hill Asset Management, L.P. (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9954724 - Disclosure - INVESTMENTS - Amortized Cost and Fair Value of the Investment in IHAM (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTSAmortizedCostandFairValueoftheInvestmentinIHAMDetails</Role>
      <ShortName>INVESTMENTS - Amortized Cost and Fair Value of the Investment in IHAM (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9954725 - Disclosure - INVESTMENTS - Dividend and Interest Income, IHAM (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTSDividendandInterestIncomeIHAMDetails</Role>
      <ShortName>INVESTMENTS - Dividend and Interest Income, IHAM (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9954726 - Disclosure - INVESTMENTS - Yields at Amortized Cost and Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTSYieldsatAmortizedCostandFairValueDetails</Role>
      <ShortName>INVESTMENTS - Yields at Amortized Cost and Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9954727 - Disclosure - INVESTMENTS - IHAM Selected Balance Sheet Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTSIHAMSelectedBalanceSheetInformationDetails</Role>
      <ShortName>INVESTMENTS - IHAM Selected Balance Sheet Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9954728 - Disclosure - INVESTMENTS - IHAM Selected Statement of Operations Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/INVESTMENTSIHAMSelectedStatementofOperationsInformationDetails</Role>
      <ShortName>INVESTMENTS - IHAM Selected Statement of Operations Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9954729 - Disclosure - DEBT - Debt Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DEBTDebtNarrativeDetails</Role>
      <ShortName>DEBT - Debt Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9954730 - Disclosure - DEBT - Schedule of Outstanding Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DEBTScheduleofOutstandingDebtDetails</Role>
      <ShortName>DEBT - Schedule of Outstanding Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9954731 - Disclosure - DEBT - Revolving Credit Facility Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DEBTRevolvingCreditFacilityNarrativeDetails</Role>
      <ShortName>DEBT - Revolving Credit Facility Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9954732 - Disclosure - DEBT - Schedule of Components of Debt Interest Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DEBTScheduleofComponentsofDebtInterestExpenseDetails</Role>
      <ShortName>DEBT - Schedule of Components of Debt Interest Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9954733 - Disclosure - DEBT - Revolving Funding Facility Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DEBTRevolvingFundingFacilityNarrativeDetails</Role>
      <ShortName>DEBT - Revolving Funding Facility Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9954734 - Disclosure - DEBT - SMBC Funding Facility Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DEBTSMBCFundingFacilityNarrativeDetails</Role>
      <ShortName>DEBT - SMBC Funding Facility Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9954735 - Disclosure - DEBT - BNP Funding Facility Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DEBTBNPFundingFacilityNarrativeDetails</Role>
      <ShortName>DEBT - BNP Funding Facility Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9954736 - Disclosure - DEBT - Convertible Unsecured Notes Narrative (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DEBTConvertibleUnsecuredNotesNarrativeDetails</Role>
      <ShortName>DEBT - Convertible Unsecured Notes Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9954737 - Disclosure - DEBT - Schedule of Key Components of Convertible Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DEBTScheduleofKeyComponentsofConvertibleNotesDetails</Role>
      <ShortName>DEBT - Schedule of Key Components of Convertible Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9954738 - Disclosure - DEBT - Schedule of Key Components of Unsecured Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DEBTScheduleofKeyComponentsofUnsecuredNotesDetails</Role>
      <ShortName>DEBT - Schedule of Key Components of Unsecured Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9954739 - Disclosure - DERIVATIVE INSTRUMENTS - Schedule of Derivative Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DERIVATIVEINSTRUMENTSScheduleofDerivativeInstrumentsDetails</Role>
      <ShortName>DERIVATIVE INSTRUMENTS - Schedule of Derivative Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9954740 - Disclosure - DERIVATIVE INSTRUMENTS - Schedule of Net Realized and Unrealized Gains (Losses) on Derivative Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DERIVATIVEINSTRUMENTSScheduleofNetRealizedandUnrealizedGainsLossesonDerivativeInstrumentsDetails</Role>
      <ShortName>DERIVATIVE INSTRUMENTS - Schedule of Net Realized and Unrealized Gains (Losses) on Derivative Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9954741 - Disclosure - COMMITMENTS AND CONTINGENCIES - Schedule of Loan Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/COMMITMENTSANDCONTINGENCIESScheduleofLoanCommitmentsDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Schedule of Loan Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9954742 - Disclosure - COMMITMENTS AND CONTINGENCIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/COMMITMENTSANDCONTINGENCIESNarrativeDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9954743 - Disclosure - COMMITMENTS AND CONTINGENCIES - Schedule of Private Equity Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/COMMITMENTSANDCONTINGENCIESScheduleofPrivateEquityCommitmentsDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Schedule of Private Equity Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9954744 - Disclosure - COMMITMENTS AND CONTINGENCIES - Schedule of Components of Operating Lease Expense and Supplemental Cash Flow Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/COMMITMENTSANDCONTINGENCIESScheduleofComponentsofOperatingLeaseExpenseandSupplementalCashFlowInformationDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Schedule of Components of Operating Lease Expense and Supplemental Cash Flow Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9954745 - Disclosure - COMMITMENTS AND CONTINGENCIES - Schedule of Supplemental Balance Sheet Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/COMMITMENTSANDCONTINGENCIESScheduleofSupplementalBalanceSheetInformationDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Schedule of Supplemental Balance Sheet Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9954746 - Disclosure - COMMITMENTS AND CONTINGENCIES - Schedule of Future Minimum Lease Payments Under Operating Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/COMMITMENTSANDCONTINGENCIESScheduleofFutureMinimumLeasePaymentsUnderOperatingLeasesDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Schedule of Future Minimum Lease Payments Under Operating Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9954747 - Disclosure - COMMITMENTS AND CONTINGENCIES - Schedule of Future Expected Rental Payments to be Received (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/COMMITMENTSANDCONTINGENCIESScheduleofFutureExpectedRentalPaymentstobeReceivedDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Schedule of Future Expected Rental Payments to be Received (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9954748 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS- Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS- Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9954749 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofFairValueMeasurementInputsandValuationTechniquesDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9954750 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Changes in Investments that use Level 3 Inputs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofChangesinInvestmentsthatuseLevel3InputsDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Changes in Investments that use Level 3 Inputs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9954751 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS- Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSNarrativeDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS- Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9954752 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Carrying Values and Estimated Fair Values of Debt Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofCarryingValuesandEstimatedFairValuesofDebtInstrumentsDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Carrying Values and Estimated Fair Values of Debt Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9954753 - Disclosure - STOCKHOLDERS??? EQUITY - Schedule of Common Shares Issued and Sold (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/STOCKHOLDERSEQUITYScheduleofCommonSharesIssuedandSoldDetails</Role>
      <ShortName>STOCKHOLDERS??? EQUITY - Schedule of Common Shares Issued and Sold (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9954754 - Disclosure - STOCKHOLDERS??? EQUITY - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/STOCKHOLDERSEQUITYNarrativeDetails</Role>
      <ShortName>STOCKHOLDERS??? EQUITY - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9954755 - Disclosure - EARNINGS PER SHARE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/EARNINGSPERSHAREDetails</Role>
      <ShortName>EARNINGS PER SHARE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/EARNINGSPERSHARETables</ParentRole>
      <Position>79</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9954756 - Disclosure - DIVIDENDS AND DISTRIBUTIONS - Schedule of Dividends Declared and Payable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DIVIDENDSANDDISTRIBUTIONSScheduleofDividendsDeclaredandPayableDetails</Role>
      <ShortName>DIVIDENDS AND DISTRIBUTIONS - Schedule of Dividends Declared and Payable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9954757 - Disclosure - DIVIDENDS AND DISTRIBUTIONS - Schedule of Dividend Reinvestment Plan Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/DIVIDENDSANDDISTRIBUTIONSScheduleofDividendReinvestmentPlanActivityDetails</Role>
      <ShortName>DIVIDENDS AND DISTRIBUTIONS - Schedule of Dividend Reinvestment Plan Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>9954758 - Disclosure - RELATED PARTY TRANSACTIONS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/RELATEDPARTYTRANSACTIONSDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/RELATEDPARTYTRANSACTIONS</ParentRole>
      <Position>82</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>9954759 - Disclosure - FINANCIAL HIGHLIGHTS - Schedule of Financial Highlights (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/FINANCIALHIGHLIGHTSScheduleofFinancialHighlightsDetails</Role>
      <ShortName>FINANCIAL HIGHLIGHTS - Schedule of Financial Highlights (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>9954760 - Disclosure - FINANCIAL HIGHLIGHTS - Schedule of Financial Highlights, Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/FINANCIALHIGHLIGHTSScheduleofFinancialHighlightsAdditionalInformationDetails</Role>
      <ShortName>FINANCIAL HIGHLIGHTS - Schedule of Financial Highlights, Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="arcc-20230331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>9954761 - Disclosure - SUBSEQUENT EVENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.arescapitalcorp.com/role/SUBSEQUENTEVENTSDetails</Role>
      <ShortName>SUBSEQUENT EVENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.arescapitalcorp.com/role/SUBSEQUENTEVENTS</ParentRole>
      <Position>85</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Warning">[dq-0542-Deprecated-Concept] Concept InvestmentCompanyDistributableEarnings in us-gaap/2022 used in 2 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. arcc-20230331.htm 4</Log>
    <Log type="Warning">[dq-0542-Deprecated-Concept] Concept DueToRelatedPartiesCurrentAndNoncurrent in us-gaap/2022 used in 2 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. arcc-20230331.htm 4</Log>
    <Log type="Warning">[dq-0542-Deprecated-Concept] Concept LondonInterbankOfferedRateLIBORMember in us-gaap/2022 used in 6 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. arcc-20230331.htm 4</Log>
    <Log type="Warning">[dq-0542-Deprecated-Concept] Concept LondonInterbankOfferedRateLiborSwapRateMember in us-gaap/2022 used in 2 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. arcc-20230331.htm 4</Log>
    <Log type="Warning">[dq-0542-Deprecated-Concept] Concept SecurityAxis in cef/2022 used in 12 facts was deprecated in cef/2023 as of 2023-01-31 and should not be used. arcc-20230331.htm 4</Log>
    <Log type="Warning">[ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 2 fact(s) appearing in ix:hidden were eligible for transformation: us-gaap:LesseeOperatingLeaseRemainingLeaseTerm -  arcc-20230331.htm 4</Log>
  </Logs>
  <InputFiles>
    <File doctype="10-Q" original="arcc-20230331.htm">arcc-20230331.htm</File>
    <File>arcc-20230331.xsd</File>
    <File>arcc-20230331_cal.xml</File>
    <File>arcc-20230331_def.xml</File>
    <File>arcc-20230331_lab.xml</File>
    <File>arcc-20230331_pre.xml</File>
    <File>arcc-bnpfacility5thamendme.htm</File>
    <File>arcc-jpmfacility14thamendm.htm</File>
    <File>arccq1-23exhibit31.htm</File>
    <File>arccq1-23exhibit311.htm</File>
    <File>arccq1-23exhibit312.htm</File>
    <File>arccq1-23exhibit321.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2022</BaseTaxonomy>
    <BaseTaxonomy items="1765">http://fasb.org/us-gaap-sup/2022q3</BaseTaxonomy>
    <BaseTaxonomy items="12277">http://fasb.org/us-gaap/2022</BaseTaxonomy>
    <BaseTaxonomy items="17">http://xbrl.sec.gov/cef/2022</BaseTaxonomy>
    <BaseTaxonomy items="30">http://xbrl.sec.gov/dei/2022</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
