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Concentration of Credit Risk, Significant Customers and Geographic Information - Summary of Long-lived Assets by Geographical Area (Detail) - Rocket Lab USA, Inc. - Long Lived Assets [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Concentration Risk [Line Items] |  |
Long-Lived Assets | $ 91,216 | $ 67,055
Percentage of Long-Lived Assets | 100.00% | 100.00%
UNITED STATES |  |
Concentration Risk [Line Items] |  |
Long-Lived Assets | $ 34,303 | $ 30,693
Percentage of Long-Lived Assets | 38.00% | 46.00%
NEW ZEALAND |  |
Concentration Risk [Line Items] |  |
Long-Lived Assets | $ 43,323 | $ 36,362
Percentage of Long-Lived Assets | 47.00% | 54.00%
CANADA |  |
Concentration Risk [Line Items] |  |
Long-Lived Assets | $ 13,590 |
Percentage of Long-Lived Assets | 15.00% | 0.00%

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 + Details
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