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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
	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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+ References

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- Definition

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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

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