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Significant Accounting Policies (Detail) | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) shares | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) shares | Jun. 30, 2021 USD ($) Segment shares | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) Segment shares | Dec. 31, 2019 USD ($)
Summary of Significant Accounting Policies Details [Line Items] |  |  |  |  |  |  |
Federal depository insurance coverage |  |  | $ 250,000,000 | $ 250,000,000 |  |  |
Accumulated deficit | $ (59,362,823) |  | (12,341,951) | (59,362,823) |  | $ (12,341,951) |
Net loss | (1,059,094) | $ (23,560,263) | (12,341,951) | (24,619,357) |  |  |
Net cash used in operating activities |  |  | (506,715) | (821,057) |  |  |
Cash and cash equivalents | $ 44,846 |  | $ 865,903 | $ 44,846 |  | $ 865,903 |
Class A ordinary shares [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies Details [Line Items] |  |  |  |  |  |  |
Warrants to purchase | shares |  |  | 16,266,667 | 16,266,667 |  |  |
Shares Subject To Possible Redemption | shares | 32,000,000 |  | 28,025,733 | 32,000,000 |  | 28,025,733 |
Rocket Lab USA, Inc. |  |  |  |  |  |  |
Summary of Significant Accounting Policies Details [Line Items] |  |  |  |  |  |  |
Accumulated deficit | $ (220,238,000) |  | $ (187,691,000) | $ (220,238,000) |  | $ (187,691,000) | $ (132,686,000)
Net loss |  |  |  | (32,547,000) | $ (23,453,000) | (55,005,000) | (30,360,000)
Net cash used in operating activities |  |  |  | (36,582,000) | $ (12,098,000) | (27,757,000) | (25,324,000)
Cash and cash equivalents | 107,931,000 |  | 52,792,000 | 107,931,000 |  | 52,792,000 | 95,878,000
Capitalized transaction costs |  |  |  | 3,395,000 |  |  |
Deferred capitalized transaction costs | 3,395,000 |  |  | 3,395,000 |  |  |
Restricted cash |  |  | 1,141,000 |  |  | 1,141,000 | 1,816,000
Impairments for long-lived assets |  |  |  |  |  | 0 | 0
Impairment of goodwill |  |  |  |  |  | 0 |
Goodwill | $ 3,277,000 |  | $ 3,133,000 | $ 3,277,000 |  | $ 3,133,000 | $ 0
Expected dividend yield |  |  |  |  |  | 0.00% | 0.00%
Number of operating segments | Segment |  |  |  | 2 |  | 2 |
Rocket Lab USA, Inc. | Research and development, net |  |  |  |  |  |  |
Summary of Significant Accounting Policies Details [Line Items] |  |  |  |  |  |  |
Grant proceeds |  |  |  |  |  | $ 3,695,000 | $ 3,296,000
Rocket Lab USA, Inc. | Minimum [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies Details [Line Items] |  |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  |  |  | 1 year |
Rocket Lab USA, Inc. | Maximum [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies Details [Line Items] |  |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  |  |  | 20 years |
Percentage of research and development costs grant reimburse |  |  |  |  |  | 20.00% |

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