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Fair Value Measurement - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 28, 2020
Dec. 31, 2019
Dec. 31, 2018
Private Placement Warrants [Member]            
Liabilities:            
Warrants-preferred stock (Note 11) $ 15,876,000        
Level 1 [Member]            
Assets:            
Cash and marketable securities held in Trust Account 320,014,519 $ 320,004,846        
Level 1 [Member] | Public Warrants [Member]            
Liabilities:            
Warrant Liability 30,240,001 16,106,667        
Level 2 [Member] | Private Placement Warrants [Member]            
Liabilities:            
Warrant Liability 15,876,000 8,456,000        
Level 3 [Member] | Private Placement Warrants [Member]            
Liabilities:            
Warrants-preferred stock (Note 11)   8,456,000 $ 4,640,000      
Fair Value, Recurring [Member] | Level 1 [Member]            
Assets:            
Cash and marketable securities held in Trust Account   320,004,846        
Fair Value, Recurring [Member] | Level 1 [Member] | Public Warrants [Member]            
Liabilities:            
Warrant Liability   16,106,667        
Fair Value, Recurring [Member] | Level 3 [Member] | Private Placement Warrants [Member]            
Liabilities:            
Warrant Liability   8,456,000        
Rocket Lab USA, Inc.            
Liabilities:            
Warrants-preferred stock (Note 11) 9,377,000 3,899,000     $ 1,284,000 $ 1,197,000
Rocket Lab USA, Inc. | Fair Value, Recurring [Member]            
Cash equivalents:            
Money market accounts 24,888,000 49,869,000     93,314,000  
Total 24,888,000 49,869,000     93,314,000  
Liabilities:            
Warrants-preferred stock (Note 11) 9,377,000 3,899,000     1,284,000  
Total 9,377,000 3,899,000     1,284,000  
Rocket Lab USA, Inc. | Fair Value, Recurring [Member] | Level 1 [Member]            
Cash equivalents:            
Money market accounts 24,888,000 49,869,000     93,314,000  
Total 24,888,000 49,869,000     93,314,000  
Rocket Lab USA, Inc. | Fair Value, Recurring [Member] | Level 3 [Member]            
Liabilities:            
Warrants-preferred stock (Note 11) 9,377,000 3,899,000     1,284,000  
Total $ 9,377,000 $ 3,899,000     $ 1,284,000