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Capitalization - Schedule of Temporary equity (Detail) - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Schedule of Capitalization, Equity [Line Items] |  |
Issue Price | $ 10.00 | $ 10.00
Rocket Lab USA, Inc. | Preferred Class A [Member] |  |
Schedule of Capitalization, Equity [Line Items] |  |
Dividend Rate | 0.05 | 0.05
Issue Price | 0.80 | 0.80
Rocket Lab USA, Inc. | Series B Preferred Stock [Member] |  |
Schedule of Capitalization, Equity [Line Items] |  |
Dividend Rate | 0.11 | 0.11
Issue Price | 1.80 | 1.80
Rocket Lab USA, Inc. | Series C Preferred Stock [Member] |  |
Schedule of Capitalization, Equity [Line Items] |  |
Dividend Rate | 0.20 | 0.20
Issue Price | 3.37 | 3.37
Rocket Lab USA, Inc. | Series D Preferred Stock [Member] |  |
Schedule of Capitalization, Equity [Line Items] |  |
Dividend Rate | 1.71 | 1.71
Issue Price | 28.57 | 28.57
Rocket Lab USA, Inc. | Series E preferred stock |  |
Schedule of Capitalization, Equity [Line Items] |  |
Dividend Rate | 1.89 | 1.89
Issue Price | 31.53 | 31.53
Rocket Lab USA, Inc. | Series E-1 Preferred Stock [Member] |  |
Schedule of Capitalization, Equity [Line Items] |  |
Dividend Rate | 1.89 | 1.89
Issue Price | $ 31.53 | $ 31.53

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