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Subsequent Events - Additional Information (Detail) - USD ($) |  |  | 5 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 10, 2021 | Mar. 01, 2021 | Dec. 31, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Aug. 01, 2021 | May 13, 2021 | Dec. 23, 2020 | Sep. 30, 2020 | Sep. 29, 2020 | Dec. 31, 2019
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share |  |  | $ 10.00 | $ 10.00 | $ 10.00 |  |  |  |  |  |
Term loan facility, initial facility charge |  |  |  | $ 1,000,000 |  |  |  |  |  |  |
Term loan facility, end of term charge upon repayment of the loan |  |  |  | $ 3,250,000 |  |  |  |  |  |  |
Share Price |  |  |  |  |  |  |  |  | $ 10.14 | $ 10.12 |
Stock Issued During Period, Value, New Issues |  |  | $ 25,000 |  |  |  |  |  |  |  |
Class A ordinary shares [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in Dollars per share) |  |  | $ 0.0001 | $ 0.0001 | 0.0001 |  |  |  |  |  |
Share Price |  |  | 18.00 | 18.00 | 18.00 |  |  |  |  |  |
Class B ordinary shares [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in Dollars per share) |  |  | $ 0.0001 | 0.0001 | 0.0001 |  |  |  |  |  |
Class B ordinary shares [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 8,625,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  | $ 863 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock Transfers Threshold Consecutive Trading Days |  | 30 days |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock Transfers Threshold Trading Days |  | 20 days |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Sponsor [Member] | Working Capital Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 300,000 |  |  |  |  |
Subsequent Event [Member] | Delaware Vector Common Stock [Member] | Delaware Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in Dollars per share) |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share Price |  | $ 20.00 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Pubco Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percenatge of aggregate Share Consideration |  | 8.00% |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Pubco Common Stock [Member] | PIPE Investors [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share |  | $ 10.00 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 46,700,000 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 467,000,000 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Class A ordinary shares [Member] | Delaware Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in Dollars per share) |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Class B ordinary shares [Member] | Delaware Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in Dollars per share) |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Rocket Lab USA, Inc. |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in Dollars per share) |  |  | $ 0.0001 | $ 0.0001 | $ 0.0001 |  |  |  |  |  | $ 0.0001
Term loan facility | $ 100,000,000 |  |  |  |  |  |  | $ 35,000,000 |  |  |
Loan agreement maturity date |  |  |  |  | Dec. 23, 2022 |  |  |  |  |  |
Term loan facility, initial facility charge |  |  |  |  | $ 105,000 |  |  |  |  |  |
Share Price |  |  | $ 12.80 |  | $ 12.80 |  |  |  |  |  | $ 11.84
Long-term borrowings, excluding current installments |  |  |  | $ 98,827,000 |  |  |  |  |  |  |
Rocket Lab USA, Inc. | Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan agreement maturity date | Jun. 01, 2024 |  |  |  |  |  |  |  |  |  |
Description of outstanding principal of term loan facility | The outstanding principal bears (i) cash interest at the greater of (a) 8.15% or (b) 8.15% plus the prime rate minus 3.25% and (ii) payment-in-kind interest of 1.25% which is accrued and added to the outstanding principal balance. |  |  |  |  |  |  |  |  |  |
Term loan advance |  |  |  |  |  |  | $ 15,000,000 |  |  |  |
Repayment of term loan advance | $ 15,000,000 |  |  | 15,000,000 |  |  |  |  |  |  |
Long-term borrowings, excluding current installments |  |  |  | $ 98,827,000 |  |  |  |  |  |  |

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