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Capitalization - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
May 18, 2020
Jun. 30, 2021
Dec. 31, 2020
Oct. 20, 2020
Mar. 31, 2019
Schedule of Capitalization, Equity [Line Items]          
Price per share   $ 11.50 $ 11.50 $ 10.00  
Rocket Lab USA, Inc. | Common Stock [Member]          
Schedule of Capitalization, Equity [Line Items]          
Common stock, voting rights   The holder of each share of common stock has the right to one vote for each share and is entitled to notice of any stockholders’ meeting and to vote upon certain events. The holder of each share of common stock has the right to one vote for each share and is entitled to notice of any stockholders’ meeting and to vote upon certain events.    
Price per share         $ 23.6487
Rocket Lab USA, Inc. | Redeemable Convertible Preferred Stock [Member]          
Schedule of Capitalization, Equity [Line Items]          
Temporary equity, par value   $ 0.0001 $ 0.0001    
Rocket Lab USA, Inc. | Redeemable Convertible Preferred Stock [Member] | Minimum [Member]          
Schedule of Capitalization, Equity [Line Items]          
Price per share   $ 31.53 $ 31.53    
Rocket Lab USA, Inc. | Redeemable Convertible Preferred Stock [Member] | Maximum [Member]          
Schedule of Capitalization, Equity [Line Items]          
Gross proceeds   $ 100,000 $ 100,000    
Rocket Lab USA, Inc. | Series E-1 Preferred Stock [Member]          
Schedule of Capitalization, Equity [Line Items]          
Temporary Equity, Shares Issued 650,140        
Proceeds from convertible preferred stock $ 20,500