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Concentration of Credit Risk, Significant Customers and Geographic Information - Summary of Percentage of Customers Accounted for Revenue (Detail) - Rocket Lab USA, Inc. - Revenue Benchmark [Member]	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
US Government Customer D [Member]
Concentration Risk [Line Items]
Percentage of Revenue	21.00%	12.00%
International Customer E [Member]
Concentration Risk [Line Items]
Percentage of Revenue	18.00%
US Commercial Customer F [Member]
Concentration Risk [Line Items]
Percentage of Revenue	15.00%
US Commercial Customer G [Member]
Concentration Risk [Line Items]
Percentage of Revenue	14.00%	26.00%

X

- Definition

Concentration risk percentage.

+ References

No definition available.

+ 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

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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