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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