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Fair Value Measurements - Schedule of changes in the fair value of warrant liabilities (Detail) - USD ($)
 3 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended
Sep. 29, 2020
Sep. 30, 2020
Dec. 31, 2020
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Change in fair value of warrant liabilities     $ 11,989,334 $ 21,553,334    
Rocket Lab USA, Inc.            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Beginning balance       3,899,000 $ 1,284,000 $ 1,197,000
Cost of warrants vesting during the period       352,000 198,000  
Change in fair value included in earnings       5,126,000 2,417,000 87,000
Ending balance     3,899,000 9,377,000 3,899,000 $ 1,284,000
Private Placement [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Beginning balance          
January 1, 2021       8,456,000    
Change in fair value of warrant liabilities       7,420,000    
Ending balance       15,876,000    
Private Placement [Member] | Fair Value, Inputs, Level 3 [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Beginning balance       8,456,000    
Initial measurement $ 4,373,333          
Change in fair value included in earnings   266,667 3,816,000      
Ending balance   4,640,000 8,456,000   8,456,000  
Warrant Liabilities [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Beginning balance          
January 1, 2021       24,562,667    
Change in fair value of warrant liabilities       21,553,334    
Ending balance       46,116,001    
Warrant Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Initial measurement 12,573,333          
Change in fair value included in earnings   766,667 11,222,667      
Ending balance   13,340,000        
Warrant Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Beginning balance       24,562,667    
Ending balance     24,562,667   24,562,667  
Public [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Beginning balance          
January 1, 2021       16,106,667    
Change in fair value of warrant liabilities       14,133,334    
Ending balance       30,240,001    
Public [Member] | Fair Value, Inputs, Level 3 [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Beginning balance       $ 16,106,667    
Initial measurement $ 8,200,000          
Change in fair value included in earnings   50,000 7,406,667      
Ending balance   $ 8,700,000 $ 16,106,667   $ 16,106,667