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Significant Accounting Policies - Schedule of Estimated Useful Lives of Property, Plant and Equipment (Detail) - Rocket Lab USA, Inc.	12 Months Ended
	Dec. 31, 2020
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	Shorter of remaining lease term or estimated useful life
Minimum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Minimum [Member] | Machinery, Equipment, Vehicles And Office Furniture [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Minimum [Member] | Computer Equipment, Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Minimum [Member] | Launch Site Assets [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Maximum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	30 years
Maximum [Member] | Machinery, Equipment, Vehicles And Office Furniture [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	12 years
Maximum [Member] | Computer Equipment, Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Maximum [Member] | Launch Site Assets [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years

X

- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123364984&loc=d3e1205-110223

+ Details

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X

- 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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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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- Details

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