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Fair Value Measurement - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 28, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Private Placement Warrants [Member] |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Warrants-preferred stock (Note 11) | $ 15,876,000 |  |  |  |  |
Level 1 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash and marketable securities held in Trust Account | 320,014,519 | $ 320,004,846 |  |  |  |
Level 1 [Member] | Public Warrants [Member] |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Warrant Liability | 30,240,001 | 16,106,667 |  |  |  |
Level 2 [Member] | Private Placement Warrants [Member] |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Warrant Liability | 15,876,000 | 8,456,000 |  |  |  |
Level 3 [Member] | Private Placement Warrants [Member] |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Warrants-preferred stock (Note 11) |  | 8,456,000 | $ 4,640,000 |  |  |
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash and marketable securities held in Trust Account |  | 320,004,846 |  |  |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Public Warrants [Member] |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Warrant Liability |  | 16,106,667 |  |  |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Private Placement Warrants [Member] |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Warrant Liability |  | 8,456,000 |  |  |  |
Rocket Lab USA, Inc. |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Warrants-preferred stock (Note 11) | 9,377,000 | 3,899,000 |  |  | $ 1,284,000 | $ 1,197,000
Rocket Lab USA, Inc. | Fair Value, Recurring [Member] |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |
Money market accounts | 24,888,000 | 49,869,000 |  |  | 93,314,000 |
Total | 24,888,000 | 49,869,000 |  |  | 93,314,000 |
Liabilities: |  |  |  |  |  |
Warrants-preferred stock (Note 11) | 9,377,000 | 3,899,000 |  |  | 1,284,000 |
Total | 9,377,000 | 3,899,000 |  |  | 1,284,000 |
Rocket Lab USA, Inc. | Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |
Money market accounts | 24,888,000 | 49,869,000 |  |  | 93,314,000 |
Total | 24,888,000 | 49,869,000 |  |  | 93,314,000 |
Rocket Lab USA, Inc. | Fair Value, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Warrants-preferred stock (Note 11) | 9,377,000 | 3,899,000 |  |  | 1,284,000 |
Total | $ 9,377,000 | $ 3,899,000 |  |  | $ 1,284,000 |

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