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Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount Of Unrecognized Tax Benefits (Detail) - Rocket Lab USA, Inc. - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Balance at beginning of year | $ 800 | $ 800
Increases (decreases) related to prior year tax positions | 0 | 0
Balance at end of year | $ 800 | $ 800

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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