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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 5 Months Ended 6 Months Ended
Dec. 31, 2020
Jun. 30, 2021
Dec. 31, 2019
May 23, 2016
Loss Contingencies [Line Items]        
Underwriting discount, per unit $ 0.35 $ 0.35    
Underwriters aggregate amount $ 11,200,000,000 $ 11,200,000,000    
Preferred stock, par value $ 0.0001 $ 0.0001    
Aggregate purchase price   $ 40,000,000    
Aggregate shares (in Shares)   46,700,000    
Purchase price per share   $ 10.00    
Gross proceeds (in Dollars)   $ 467,000,000    
Provision for contract loss $ 5,109,000      
Business Combination [Member]        
Loss Contingencies [Line Items]        
Business combination description   In addition to the above consideration, if the closing price of New Rocket Lab Common Stock is equal to or greater than $20.00 for a period of at least 20 days out of 30 consecutive trading days during the period commencing on the 90th day following the Closing and ending on the 180th day following the Closing, the Rocket Lab stockholders will be entitled to receive additional shares of New Rocket Lab Common Stock equal to 8% of the Aggregate Share Consideration (as defined below) (computed without the deduction for the Management Redemption Shares). For purposes of the Merger Agreement, the “Exchange Ratio” equals the quotient obtained by dividing (i) the Aggregate Share Consideration by (ii) the aggregate number of shares of Rocket Lab Common Stock outstanding immediately prior to the Charter Amendment on a fully diluted basis (other than the Management Redemption Shares). The “Aggregate Share Consideration” means the quotient obtained by dividing (i) an amount equal to $4,000,000,000 minus the Management Redemption Amount by (ii) (x) an amount equal to $10.00 plus (y) an amount equal to (a) the interest earned on funds held in the Company’s trust account divided by (b) the number of Class A ordinary shares outstanding immediately prior to the Closing.    
Class A ordinary shares [Member]        
Loss Contingencies [Line Items]        
Common stock, par value $ 0.0001 $ 0.0001    
Vector delaware class A common stock [Member]        
Loss Contingencies [Line Items]        
Common stock, par value   0.0001    
Common stock conversion price   0.0001    
Vector delaware class B common stock [Member]        
Loss Contingencies [Line Items]        
Preferred stock, par value   0.0001    
Common stock conversion price   0.0001    
Rocket Lab Common Stock [Member]        
Loss Contingencies [Line Items]        
Common stock, par value   0.0001    
Rocket Lab USA, Inc.        
Loss Contingencies [Line Items]        
Common stock, par value $ 0.0001 $ 0.0001 $ 0.0001  
Provision for contract loss   $ 4,066,000    
Rocket Lab USA, Inc. | Satellite Launch Service Agreements [Member]        
Loss Contingencies [Line Items]        
Contingent contract price       $ 3,000,000