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Income Taxes - Schedule of Net Deferred Tax Assets (Detail) - Rocket Lab USA, Inc. - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Deferred Tax Asset [Line Items] |  |  |
Deferred tax assets | $ 2,935 | $ 2,398 | $ 1,685
Deferred tax liabilities (included in Other non-current liabilities) |  | (150) | 0
Net deferred tax assets |  | $ 2,248 | $ 1,685

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