<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>229</ContextCount>
  <ElementCount>323</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>69</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>5</UnitCount>
  <MyReports>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/CondensedConsolidatedBalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100020 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/CondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100030 - Statement - Condensed Consolidated Statements of Operations and Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss</Role>
      <ShortName>Condensed Consolidated Statements of Operations and Comprehensive Loss</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100040 - Statement - Condensed Statements of Changes in Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/CondensedStatementsOfChangesInShareholdersEquity</Role>
      <ShortName>Condensed Statements of Changes in Shareholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100050 - Statement - Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/CondensedConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100060 - Disclosure - DESCRIPTION OF THE BUSINESS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/DescriptionOfTheBusiness</Role>
      <ShortName>DESCRIPTION OF THE BUSINESS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100070 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/SignificantAccountingPolicies</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100080 - Disclosure - REVENUES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/Revenues</Role>
      <ShortName>REVENUES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100090 - Disclosure - BUSINESS COMBINATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/DisclosureBusinessCombination</Role>
      <ShortName>BUSINESS COMBINATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100100 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/FairValueOfFinancialInstruments</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>100110 - Disclosure - INVENTORIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/Inventories</Role>
      <ShortName>INVENTORIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>100120 - Disclosure - PREPAIDS AND OTHER CURRENT ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/PrepaidsAndOtherCurrentAssets</Role>
      <ShortName>PREPAIDS AND OTHER CURRENT ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>100130 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/PropertyPlantAndEquipmentNet</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>100140 - Disclosure - GOODWILL AND INTANGIBLE ASSETS, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/GoodwillAndIntangibleAssetsNet</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>100150 - Disclosure - LOAN AGREEMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/DisclosureLoanAgreement</Role>
      <ShortName>LOAN AGREEMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>100160 - Disclosure - PUBLIC AND PRIVATE WARRANTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/DisclosurePublicAndPrivateWarrants</Role>
      <ShortName>PUBLIC AND PRIVATE WARRANTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>100180 - Disclosure - STOCK-BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/StockBasedCompensation</Role>
      <ShortName>STOCK-BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>100190 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/Leases</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>100200 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/CommitmentsAndContingencies</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>100210 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/IncomeTaxes</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>100220 - Disclosure - NET LOSS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/NetLossPerShare</Role>
      <ShortName>NET LOSS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>100230 - Disclosure - SEGMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/Segments</Role>
      <ShortName>SEGMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>100240 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/RelatedPartyTransactions</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>100260 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/SignificantAccountingPoliciesPolicies</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>100270 - Disclosure - REVENUES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/RevenuesTables</Role>
      <ShortName>REVENUES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rocketlabusa.com/20220630/taxonomy/role/Revenues</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>100280 - Disclosure - BUSINESS COMBINATIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/DisclosureBusinessCombinationsTables</Role>
      <ShortName>BUSINESS COMBINATIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rocketlabusa.com/20220630/taxonomy/role/DisclosureBusinessCombination</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>100290 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/FairValueOfFinancialInstrumentsTables</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rocketlabusa.com/20220630/taxonomy/role/FairValueOfFinancialInstruments</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>100300 - Disclosure - INVENTORIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/InventoriesTables</Role>
      <ShortName>INVENTORIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rocketlabusa.com/20220630/taxonomy/role/Inventories</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>100310 - Disclosure - PREPAIDS AND OTHER CURRENT ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/PrepaidsAndOtherCurrentAssetsTables</Role>
      <ShortName>PREPAIDS AND OTHER CURRENT ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rocketlabusa.com/20220630/taxonomy/role/PrepaidsAndOtherCurrentAssets</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>100320 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/PropertyPlantAndEquipmentNetTables</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rocketlabusa.com/20220630/taxonomy/role/PropertyPlantAndEquipmentNet</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>100330 - Disclosure - GOODWILL AND INTANGIBLE ASSETS, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/GoodwillAndIntangibleAssetsNetTables</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rocketlabusa.com/20220630/taxonomy/role/GoodwillAndIntangibleAssetsNet</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>100350 - Disclosure - STOCK-BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/StockBasedCompensationTables</Role>
      <ShortName>STOCK-BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rocketlabusa.com/20220630/taxonomy/role/StockBasedCompensation</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>100360 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/IncomeTaxesTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rocketlabusa.com/20220630/taxonomy/role/IncomeTaxes</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>100370 - Disclosure - NET LOSS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/NetLossPerShareTables</Role>
      <ShortName>NET LOSS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rocketlabusa.com/20220630/taxonomy/role/NetLossPerShare</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>100380 - Disclosure - SEGMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/SegmentsTables</Role>
      <ShortName>SEGMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rocketlabusa.com/20220630/taxonomy/role/Segments</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>100390 - Disclosure - Description Of The Business - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/DescriptionOfTheBusinessAdditionalInformationDetail</Role>
      <ShortName>Description Of The Business - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>100400 - Disclosure - Revenue - Reconciliation of Disaggregation of Revenue (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/RevenueReconciliationOfDisaggregationOfRevenueDetail</Role>
      <ShortName>Revenue - Reconciliation of Disaggregation of Revenue (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>100410 - Disclosure - Revenue - Balances Related to Enforceable Contracts (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/RevenueBalancesRelatedToEnforceableContractsDetail</Role>
      <ShortName>Revenue - Balances Related to Enforceable Contracts (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>100420 - Disclosure - Revenue - Changes in Contract Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/RevenueChangesInContractLiabilitiesDetail</Role>
      <ShortName>Revenue - Changes in Contract Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>100430 - Disclosure - Revenue - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/RevenueAdditionalInformationDetail</Role>
      <ShortName>Revenue - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>100440 - Disclosure - Business Combinations - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/DisclosureBusinessCombinationsAdditionalInformationDetail</Role>
      <ShortName>Business Combinations - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>100450 - Disclosure - Business Combinations - Estimates Fair Value of Assets Acquired and Liabilities Assumed (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/DisclosureBusinessCombinationsEstimatesFairValueOfAssetsAcquiredAndLiabilitiesAssumedDetail</Role>
      <ShortName>Business Combinations - Estimates Fair Value of Assets Acquired and Liabilities Assumed (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>100460 - Disclosure - Business Combinations - Summary of Identifiable Intangible Assets Acquired and Related Expected Lives for the Finite-Lived Intangible Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/DisclosureBusinessCombinationsSummaryOfIdentifiableIntangibleAssetsAcquiredAndRelatedExpectedLivesForTheFinitelivedIntangibleAssetsDetail</Role>
      <ShortName>Business Combinations - Summary of Identifiable Intangible Assets Acquired and Related Expected Lives for the Finite-Lived Intangible Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>100470 - Disclosure - Business Combinations - Summary of consolidated statement of operations includes revenues and net income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/DisclosureBusinessCombinationsSummaryOfConsolidatedStatementOfOperationsIncludesRevenuesAndNetIncomeDetails</Role>
      <ShortName>Business Combinations - Summary of consolidated statement of operations includes revenues and net income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>100480 - Disclosure - Fair Value Of Financial Instruments - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/FairValueOfFinancialInstrumentsAdditionalInformationDetail</Role>
      <ShortName>Fair Value Of Financial Instruments - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>100490 - Disclosure - Fair Value Of Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/FairValueOfFinancialInstrumentsSummaryOfFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnARecurringBasisDetail</Role>
      <ShortName>Fair Value Of Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>100510 - Disclosure - Inventories - Schedule of Inventory (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/InventoriesScheduleOfInventoryDetail</Role>
      <ShortName>Inventories - Schedule of Inventory (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>100520 - Disclosure - Prepaid and Other Current Assets - Schedule of Prepaid and Other Current Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/PrepaidAndOtherCurrentAssetsScheduleOfPrepaidAndOtherCurrentAssetsDetail</Role>
      <ShortName>Prepaid and Other Current Assets - Schedule of Prepaid and Other Current Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>100530 - Disclosure - Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/PropertyPlantAndEquipmentNetScheduleOfPropertyPlantAndEquipmentNetDetail</Role>
      <ShortName>Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>100540 - Disclosure - Property, Plant and Equipment, Net - Schedule of Depreciation Expense (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/PropertyPlantAndEquipmentNetScheduleOfDepreciationExpenseDetail</Role>
      <ShortName>Property, Plant and Equipment, Net - Schedule of Depreciation Expense (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>100550 - Disclosure - Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/GoodwillAndIntangibleAssetsNetScheduleOfChangesInTheCarryingAmountOfGoodwillDetail</Role>
      <ShortName>Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>100560 - Disclosure - Goodwill and Intangible Assets, Net - Components of Intangible Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/GoodwillAndIntangibleAssetsNetComponentsOfIntangibleAssetsDetail</Role>
      <ShortName>Goodwill and Intangible Assets, Net - Components of Intangible Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>100570 - Disclosure - Goodwill and Intangible Assets, Net - Summary of Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/GoodwillAndIntangibleAssetsNetSummaryOfAmortizationExpenseDetails</Role>
      <ShortName>Goodwill and Intangible Assets, Net - Summary of Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>100580 - Disclosure - Goodwill and Intangible Assets, Net - Schedule of Estimated Future Amortization Expense Related to Finite Intangible Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/GoodwillAndIntangibleAssetsNetScheduleOfEstimatedFutureAmortizationExpenseRelatedToFiniteIntangibleAssetsDetail</Role>
      <ShortName>Goodwill and Intangible Assets, Net - Schedule of Estimated Future Amortization Expense Related to Finite Intangible Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>100590 - Disclosure - Loan Agreement - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/DisclosureLoanAgreementAdditionalInformationDetail</Role>
      <ShortName>Loan Agreement - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>100600 - Disclosure - Warrants - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/WarrantsAdditionalInformationDetail</Role>
      <ShortName>Warrants - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>100630 - Disclosure - Stock-Based Compensation - Schedule of Stock-Based Compensation Statements (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/StockBasedCompensationScheduleOfStockBasedCompensationStatementsDetail</Role>
      <ShortName>Stock-Based Compensation - Schedule of Stock-Based Compensation Statements (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>100640 - Disclosure - Stock-based Compensation - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/StockBasedCompensationAdditionalInformationDetail</Role>
      <ShortName>Stock-based Compensation - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>100650 - Disclosure - Leases - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/LeasesAdditionalInformationDetail</Role>
      <ShortName>Leases - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>100660 - Disclosure - Commitments and Contingencies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/CommitmentsAndContingenciesAdditionalInformationDetail</Role>
      <ShortName>Commitments and Contingencies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>100670 - Disclosure - Income Taxes - Schedule Of Income Tax Expense And The Effective Tax Rate (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/IncomeTaxesScheduleOfIncomeTaxExpenseAndTheEffectiveTaxRateDetail</Role>
      <ShortName>Income Taxes - Schedule Of Income Tax Expense And The Effective Tax Rate (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>100680 - Disclosure - Net Loss Per Share - Summary of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/NetLossPerShareSummaryOfBasicAndDilutedNetLossPerShareAttributableToCommonStockholdersDetail</Role>
      <ShortName>Net Loss Per Share - Summary of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>100690 - Disclosure - Net Loss Per Share - Summary of Diluted Net Loss Per Share Attributable to Common Stockholders (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/NetLossPerShareSummaryOfDilutedNetLossPerShareAttributableToCommonStockholdersDetail</Role>
      <ShortName>Net Loss Per Share - Summary of Diluted Net Loss Per Share Attributable to Common Stockholders (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>100700 - Disclosure - Segments - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/SegmentsAdditionalInformationDetail</Role>
      <ShortName>Segments - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>100710 - Disclosure - Segments - Summary of Information by Reportable Segment (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/SegmentsSummaryOfInformationByReportableSegmentDetail</Role>
      <ShortName>Segments - Summary of Information by Reportable Segment (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="rklb-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>100720 - Disclosure - Related Party Transactions - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rocketlabusa.com/20220630/taxonomy/role/RelatedPartyTransactionsAdditionalInformationDetail</Role>
      <ShortName>Related Party Transactions - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" original="rklb-20220630.htm">rklb-20220630.htm</File>
    <File>rklb-20220630.xsd</File>
    <File>rklb-20220630_cal.xml</File>
    <File>rklb-20220630_def.xml</File>
    <File>rklb-20220630_lab.xml</File>
    <File>rklb-20220630_pre.xml</File>
    <File>rklb-ex10_2.htm</File>
    <File>rklb-ex31_1.htm</File>
    <File>rklb-ex31_2.htm</File>
    <File>rklb-ex32_1.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2022</BaseTaxonomy>
    <BaseTaxonomy items="787">http://fasb.org/us-gaap/2022</BaseTaxonomy>
    <BaseTaxonomy items="30">http://xbrl.sec.gov/dei/2022</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
