<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.19.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>277</ContextCount>
  <ElementCount>433</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>116</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001000 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1001501 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1002000 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ConsolidatedStatementsOfOperations</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1003000 - Statement - Consolidated Statements of Changes in Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity</Role>
      <ShortName>Consolidated Statements of Changes in Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1004000 - Statement - Consolidated Statements of Other Comprehensive Income Statement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ConsolidatedStatementsOfOtherComprehensiveIncomeStatement</Role>
      <ShortName>Consolidated Statements of Other Comprehensive Income Statement</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1005000 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2101100 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/SummaryOfSignificantAccountingPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2103100 - Disclosure - ACQUISITIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/Acquisitions</Role>
      <ShortName>ACQUISITIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2105100 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/RevenueFromContractsWithCustomers</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2106100 - Disclosure - CONTRACT ASSETS AND LIABILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ContractAssetsAndLiabilities</Role>
      <ShortName>CONTRACT ASSETS AND LIABILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2109100 - Disclosure - FAIR VALUE MEASUREMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/FairValueMeasurements</Role>
      <ShortName>FAIR VALUE MEASUREMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2111100 - Disclosure - DERIVATIVE INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/DerivativeInstruments</Role>
      <ShortName>DERIVATIVE INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2112100 - Disclosure - INVENTORIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/Inventories</Role>
      <ShortName>INVENTORIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2115100 - Disclosure - PREPAID EXPENSES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/PrepaidExpenses</Role>
      <ShortName>PREPAID EXPENSES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2116100 - Disclosure - PROPERTY AND EQUIPMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/PropertyAndEquipment</Role>
      <ShortName>PROPERTY AND EQUIPMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2124100 - Disclosure - INTANGIBLE ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/IntangibleAssets</Role>
      <ShortName>INTANGIBLE ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2125100 - Disclosure - DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/Debt</Role>
      <ShortName>DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2126100 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/AccumulatedOtherComprehensiveLossIncome</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2127100 - Disclosure - SHARE-BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ShareBasedCompensation</Role>
      <ShortName>SHARE-BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2128100 - Disclosure - WARRANTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/Warrants</Role>
      <ShortName>WARRANTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2130100 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/CommitmentsAndContingencies</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2131100 - Disclosure - RETIREMENT PLANS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/RetirementPlans</Role>
      <ShortName>RETIREMENT PLANS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2132100 - Disclosure - INCOME TAX PROVISION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/IncomeTaxProvision</Role>
      <ShortName>INCOME TAX PROVISION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2133100 - Disclosure - SEGMENT INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/SegmentInformation</Role>
      <ShortName>SEGMENT INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2134100 - Disclosure - ASSETS HELD FOR SALE, DISCONTINUED OPERATIONS AND DISPOSITIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/AssetsHeldForSaleDiscontinuedOperationsAndDispositions</Role>
      <ShortName>ASSETS HELD FOR SALE, DISCONTINUED OPERATIONS AND DISPOSITIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2201201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/SummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2301302 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/SummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2303301 - Disclosure - ACQUISITIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/AcquisitionsTables</Role>
      <ShortName>ACQUISITIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/Acquisitions</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2305301 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/RevenueFromContractsWithCustomersTables</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/RevenueFromContractsWithCustomers</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2306301 - Disclosure - CONTRACT ASSETS AND LIABILITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ContractAssetsAndLiabilitiesTables</Role>
      <ShortName>CONTRACT ASSETS AND LIABILITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/ContractAssetsAndLiabilities</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2309301 - Disclosure - FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/FairValueMeasurementsFairValueMeasurementsTables</Role>
      <ShortName>FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2311301 - Disclosure - DERIVATIVE INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/DerivativeInstrumentsTables</Role>
      <ShortName>DERIVATIVE INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/DerivativeInstruments</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2312301 - Disclosure - INVENTORIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/InventoriesTables</Role>
      <ShortName>INVENTORIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/Inventories</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2316301 - Disclosure - PROPERTY AND EQUIPMENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/PropertyAndEquipmentTables</Role>
      <ShortName>PROPERTY AND EQUIPMENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/PropertyAndEquipment</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2324301 - Disclosure - INTANGIBLE ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/IntangibleAssetsTables</Role>
      <ShortName>INTANGIBLE ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/IntangibleAssets</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2325301 - Disclosure - DEBT DEBT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/DebtDebtTables</Role>
      <ShortName>DEBT DEBT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2326301 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/AccumulatedOtherComprehensiveLossIncomeTables</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/AccumulatedOtherComprehensiveLossIncome</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2327301 - Disclosure - SHARE-BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ShareBasedCompensationTables</Role>
      <ShortName>SHARE-BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/ShareBasedCompensation</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2328301 - Disclosure - WARRANTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/WarrantsTables</Role>
      <ShortName>WARRANTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/Warrants</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2330301 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/CommitmentsAndContingenciesTables</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/CommitmentsAndContingencies</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2332301 - Disclosure - INCOME TAX PROVISION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/IncomeTaxProvisionTables</Role>
      <ShortName>INCOME TAX PROVISION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/IncomeTaxProvision</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2333301 - Disclosure - SEGMENT INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/SegmentInformationTables</Role>
      <ShortName>SEGMENT INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/SegmentInformation</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2334301 - Disclosure - DISCONTINUED OPERATIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/DiscontinuedOperationsTables</Role>
      <ShortName>DISCONTINUED OPERATIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2401403 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Narrative (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetail</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Narrative (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/SummaryOfSignificantAccountingPoliciesTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2401404 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Correction of Immaterial Errors on the Consolidated Balance Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/SummaryOfSignificantAccountingPoliciesCorrectionOfImmaterialErrorsOnConsolidatedBalanceSheetDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Correction of Immaterial Errors on the Consolidated Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2401405 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Correction of Immaterial Errors on Consolidated Statements of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/SummaryOfSignificantAccountingPoliciesCorrectionOfImmaterialErrorsOnConsolidatedStatementsOfOperationsDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Correction of Immaterial Errors on Consolidated Statements of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2401406 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Correction of Immaterial Errors on Consolidated Statements of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/SummaryOfSignificantAccountingPoliciesCorrectionOfImmaterialErrorsOnConsolidatedStatementsOfCashFlowsDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Correction of Immaterial Errors on Consolidated Statements of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2401407 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Goodwill) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfGoodwillDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Goodwill) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/SummaryOfSignificantAccountingPoliciesTables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2401408 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Calculation of Basic and Diluted Net Income Per Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/SummaryOfSignificantAccountingPoliciesCalculationOfBasicAndDilutedNetIncomePerShareDetail</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Calculation of Basic and Diluted Net Income Per Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2401409 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change in Accounting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/SummaryOfSignificantAccountingPoliciesChangeInAccountingDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change in Accounting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2403402 - Disclosure - ACQUISITIONS Narrative (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/AcquisitionsNarrativeDetail</Role>
      <ShortName>ACQUISITIONS Narrative (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2403403 - Disclosure - ACQUISITIONS Allocation of Total Purchase Price Paid for Acquisitions (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/AcquisitionsAllocationOfTotalPurchasePricePaidForAcquisitionsDetail</Role>
      <ShortName>ACQUISITIONS Allocation of Total Purchase Price Paid for Acquisitions (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2403404 - Disclosure - Schedule of Fair Value of Intangible Assets Acquired (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ScheduleOfFairValueOfIntangibleAssetsAcquiredDetails</Role>
      <ShortName>Schedule of Fair Value of Intangible Assets Acquired (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2403405 - Disclosure - Schedule of Pro Forma Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ScheduleOfProFormaInformationDetails</Role>
      <ShortName>Schedule of Pro Forma Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2405402 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS - Financial Statement Impact of 606 - Balance Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/RevenueFromContractsWithCustomersFinancialStatementImpactOf606BalanceSheetDetails</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS - Financial Statement Impact of 606 - Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2405403 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS - Financial Statement Impact of 606 - Statement of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/RevenueFromContractsWithCustomersFinancialStatementImpactOf606StatementOfOperationsDetails</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS - Financial Statement Impact of 606 - Statement of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2405404 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS - Revenue by Customer Type and Contract Type (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/RevenueFromContractsWithCustomersRevenueByCustomerTypeAndContractTypeDetails</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS - Revenue by Customer Type and Contract Type (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>2405405 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS - Remaining Performance Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/RevenueFromContractsWithCustomersRemainingPerformanceObligationsDetails</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS - Remaining Performance Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>2406402 - Disclosure - CONTRACT ASSETS AND LIABILITIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ContractAssetsAndLiabilitiesDetails</Role>
      <ShortName>CONTRACT ASSETS AND LIABILITIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/ContractAssetsAndLiabilitiesTables</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>2409402 - Disclosure - FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/FairValueMeasurementsFairValueMeasurementsDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/FairValueMeasurementsFairValueMeasurementsTables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>2411402 - Disclosure - DERIVATIVE INSTRUMENTS - Effect Recognized in Consolidated Statements of Operations and Consolidated Statements of Stockholders' Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/DerivativeInstrumentsEffectRecognizedInConsolidatedStatementsOfOperationsAndConsolidatedStatementsOfStockholdersEquityDetails</Role>
      <ShortName>DERIVATIVE INSTRUMENTS - Effect Recognized in Consolidated Statements of Operations and Consolidated Statements of Stockholders' Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>2411403 - Disclosure - DERIVATIVE INSTRUMENTS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/DerivativeInstrumentsAdditionalInformationDetails</Role>
      <ShortName>DERIVATIVE INSTRUMENTS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>2412402 - Disclosure - INVENTORIES Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/InventoriesAdditionalInformationDetail</Role>
      <ShortName>INVENTORIES Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>2416402 - Disclosure - PROPERTY AND EQUIPMENT (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/PropertyAndEquipmentDetail</Role>
      <ShortName>PROPERTY AND EQUIPMENT (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/PropertyAndEquipmentTables</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>2416403 - Disclosure - PROPERTY AND EQUIPMENT Narrative (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/PropertyAndEquipmentNarrativeDetail</Role>
      <ShortName>PROPERTY AND EQUIPMENT Narrative (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>2424402 - Disclosure - INTANGIBLE ASSETS Values Assigned to Intangible Assets (Other Than Goodwill) for Acquisitions (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/IntangibleAssetsValuesAssignedToIntangibleAssetsOtherThanGoodwillForAcquisitionsDetail</Role>
      <ShortName>INTANGIBLE ASSETS Values Assigned to Intangible Assets (Other Than Goodwill) for Acquisitions (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>2424403 - Disclosure - INTANGIBLE ASSETS Narrative (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/IntangibleAssetsNarrativeDetail</Role>
      <ShortName>INTANGIBLE ASSETS Narrative (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>2424404 - Disclosure - INTANGIBLE ASSETS Estimated Future Intangible Amortization Expense (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/IntangibleAssetsEstimatedFutureIntangibleAmortizationExpenseDetail</Role>
      <ShortName>INTANGIBLE ASSETS Estimated Future Intangible Amortization Expense (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>2425402 - Disclosure - DEBT - Debt Summary (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/DebtDebtSummaryDetails</Role>
      <ShortName>DEBT - Debt Summary (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>2425403 - Disclosure - DEBT - 2018 Credit Facility (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/Debt2018CreditFacilityDetails</Role>
      <ShortName>DEBT - 2018 Credit Facility (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>2425404 - Disclosure - DEBT - 2017 Credit Facility (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/Debt2017CreditFacilityDetails</Role>
      <ShortName>DEBT - 2017 Credit Facility (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>2426402 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/AccumulatedOtherComprehensiveLossIncomeDetails</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/AccumulatedOtherComprehensiveLossIncomeTables</ParentRole>
      <Position>73</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>2427402 - Disclosure - SHARE-BASED COMPENSATION Stock Options Narrative (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ShareBasedCompensationStockOptionsNarrativeDetail</Role>
      <ShortName>SHARE-BASED COMPENSATION Stock Options Narrative (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>2427403 - Disclosure - SHARE-BASED COMPENSATION Stock Incentive Plan (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ShareBasedCompensationStockIncentivePlanDetail</Role>
      <ShortName>SHARE-BASED COMPENSATION Stock Incentive Plan (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>2427404 - Disclosure - SHARE-BASED COMPENSATION Stock Option Activity (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ShareBasedCompensationStockOptionActivityDetail</Role>
      <ShortName>SHARE-BASED COMPENSATION Stock Option Activity (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>2427405 - Disclosure - SHARE-BASED COMPENSATION Outstanding Stock Options (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ShareBasedCompensationOutstandingStockOptionsDetail</Role>
      <ShortName>SHARE-BASED COMPENSATION Outstanding Stock Options (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>2427406 - Disclosure - SHARE-BASED COMPENSATION Restricted Stock Awards Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ShareBasedCompensationRestrictedStockAwardsNarrativeDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION Restricted Stock Awards Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>2427407 - Disclosure - SHARE-BASED COMPENSATION Outstanding Unvested Restricted Stock Awards (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ShareBasedCompensationOutstandingUnvestedRestrictedStockAwardsDetail</Role>
      <ShortName>SHARE-BASED COMPENSATION Outstanding Unvested Restricted Stock Awards (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>2427408 - Disclosure - Performance Stock Awards Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/PerformanceStockAwardsNarrativeDetails</Role>
      <ShortName>Performance Stock Awards Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>2427409 - Disclosure - SHARE-BASED COMPENSATION Outstanding Performance Stock Units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ShareBasedCompensationOutstandingPerformanceStockUnitsDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION Outstanding Performance Stock Units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>2427410 - Disclosure - SHARE-BASED COMPENSATION Long-term Incentive Share Rights (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ShareBasedCompensationLongTermIncentiveShareRightsDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION Long-term Incentive Share Rights (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>2427411 - Disclosure - SHARE-BASED COMPENSATION Total Stock Compensation Expense and Employee Stock Purchase Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/ShareBasedCompensationTotalStockCompensationExpenseAndEmployeeStockPurchasePlanDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION Total Stock Compensation Expense and Employee Stock Purchase Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>2428402 - Disclosure - WARRANTS Narrative (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/WarrantsNarrativeDetail</Role>
      <ShortName>WARRANTS Narrative (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>2428403 - Disclosure - WARRANTS Outstanding Warrants (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/WarrantsOutstandingWarrantsDetail</Role>
      <ShortName>WARRANTS Outstanding Warrants (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>2430402 - Disclosure - COMMITMENTS AND CONTINGENCIES Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/CommitmentsAndContingenciesNarrativeDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>2430403 - Disclosure - COMMITMENTS AND CONTINGENCIES Schedule of Future Minimum Lease Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/CommitmentsAndContingenciesScheduleOfFutureMinimumLeasePaymentsDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES Schedule of Future Minimum Lease Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>2431401 - Disclosure - RETIREMENT PLANS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/RetirementPlansDetails</Role>
      <ShortName>RETIREMENT PLANS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/RetirementPlans</ParentRole>
      <Position>88</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>2432402 - Disclosure - INCOME TAX PROVISION Income Tax (Benefit) Expense Provision (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/IncomeTaxProvisionIncomeTaxBenefitExpenseProvisionDetails</Role>
      <ShortName>INCOME TAX PROVISION Income Tax (Benefit) Expense Provision (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>2432403 - Disclosure - INCOME TAX PROVISION Deferred Tax Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/IncomeTaxProvisionDeferredTaxAssetsAndLiabilitiesDetails</Role>
      <ShortName>INCOME TAX PROVISION Deferred Tax Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>2432404 - Disclosure - INCOME TAX PROVISION Effective Income Tax Rate Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/IncomeTaxProvisionEffectiveIncomeTaxRateReconciliationDetails</Role>
      <ShortName>INCOME TAX PROVISION Effective Income Tax Rate Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>2432405 - Disclosure - INCOME TAX PROVISION Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/IncomeTaxProvisionNarrativeDetails</Role>
      <ShortName>INCOME TAX PROVISION Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>2432406 - Disclosure - INCOME TAX PROVISION Unrecognized Tax Benefits Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/IncomeTaxProvisionUnrecognizedTaxBenefitsReconciliationDetails</Role>
      <ShortName>INCOME TAX PROVISION Unrecognized Tax Benefits Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>2433402 - Disclosure - SEGMENT INFORMATION Schedule of Revenue by Major Customers (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/SegmentInformationScheduleOfRevenueByMajorCustomersDetails</Role>
      <ShortName>SEGMENT INFORMATION Schedule of Revenue by Major Customers (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>2434402 - Disclosure - ASSETS HELD FOR SALE, DISCONTINUED OPERATIONS AND DISPOSITIONS Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/AssetsHeldForSaleDiscontinuedOperationsAndDispositionsNarrativeDetails</Role>
      <ShortName>ASSETS HELD FOR SALE, DISCONTINUED OPERATIONS AND DISPOSITIONS Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.keywcorp.com/role/AssetsHeldForSaleDiscontinuedOperationsAndDispositions</ParentRole>
      <Position>95</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>2434403 - Disclosure - ASSETS HELD FOR SALE, DISCONTINUED OPERATIONS AND DISPOSITIONS Assets of Disposal Group (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/AssetsHeldForSaleDiscontinuedOperationsAndDispositionsAssetsOfDisposalGroupDetails</Role>
      <ShortName>ASSETS HELD FOR SALE, DISCONTINUED OPERATIONS AND DISPOSITIONS Assets of Disposal Group (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>2434404 - Disclosure - ASSETS HELD FOR SALE, DISCONTINUED OPERATIONS AND DISPOSITIONS Income of Disposal Group (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/AssetsHeldForSaleDiscontinuedOperationsAndDispositionsIncomeOfDisposalGroupDetails</Role>
      <ShortName>ASSETS HELD FOR SALE, DISCONTINUED OPERATIONS AND DISPOSITIONS Income of Disposal Group (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="keyw-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>2434405 - Disclosure - ASSETS HELD FOR SALE, DISCONTINUED OPERATIONS AND DISPOSITIONS Cashflow of Disposal Group (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keywcorp.com/role/AssetsHeldForSaleDiscontinuedOperationsAndDispositionsCashflowOfDisposalGroupDetails</Role>
      <ShortName>ASSETS HELD FOR SALE, DISCONTINUED OPERATIONS AND DISPOSITIONS Cashflow of Disposal Group (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>keyw-20181231.xml</File>
    <File>keyw-20181231.xsd</File>
    <File>keyw-20181231_cal.xml</File>
    <File>keyw-20181231_def.xml</File>
    <File>keyw-20181231_lab.xml</File>
    <File>keyw-20181231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/us-gaap/2017-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/invest/2013-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2014-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
