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Income Taxes- Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Indefinite Carryforward [Member] | Federal [Member] |  |  |
Operating loss carryforwards, description | carryforward indefinitely and are available to offset up to 80% of future taxable income each year. |  |
Rocket Lab USA, Inc. |  |  |
Valuation allowance against net deferred tax assets | $ 39,084 | $ 27,794 |
Unrecognized tax benefits | 800 | 800 | $ 800
Unrecognized tax benefits affecting effective tax rate | 632 | 632 |
Accrued Interest and penalties | 0 | 0 |
Rocket Lab USA, Inc. | Federal [Member] |  |  |
Operating loss carryforwards | $ 57,100 | 57,100 |
Operating loss carryforwards expiration date | Dec. 31, 2034 |  |
Rocket Lab USA, Inc. | State and Local Jurisdiction [Member] |  |  |
Operating loss carryforwards | $ 10,800 | 10,400 |
Operating loss carryforwards expiration date | Dec. 31, 2035 |  |
Rocket Lab USA, Inc. | Definite and Indefinite NOL [Member] | Federal [Member] |  |  |
Operating loss carryforwards | $ 143,700 | 112,200 |
Rocket Lab USA, Inc. | Indefinite Carryforward [Member] | Federal [Member] |  |  |
Operating loss carryforwards | $ 86,600 | $ 55,100 |

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