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Fair Value of Financial Instruments - Additional Information (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2024 USD ($)
Fair Value Measurements [Line Items] |
Transfers between fair value measurement levels | $ 0

X
- Definition Fair Value Measurements [Line Items] + References No definition available. + Details
Name: | rklb_FairValueMeasurementsLineItems
Namespace Prefix: | rklb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration