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Concentration of Credit Risk, Significant Customers and Geographic Information - Schedule of Total Accounts Receivable Net (Detail) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
U S Commercial Customer A [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 18.00% | 62.00%
U S Commercial Customer B [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage |  | 13.00%
International Customer C [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage |  | 12.00%
Commercial Customer G [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 23.00% |
Accounts Receivable [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 10.00% | 10.00%

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- Definition Concentration risk percentage. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Data Type: | na
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- Details
Name: | srt_MajorCustomersAxis=rklb_USCommercialCustomerBMember
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Data Type: | na
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- Details
Name: | srt_MajorCustomersAxis=rklb_InternationalCustomerCMember
Namespace Prefix: |
Data Type: | na
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- Details
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- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
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Data Type: | na
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