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Revenue - Reconciliation of Disaggregation of Revenue (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]        
Total revenue by recognition model $ 29,472 $ 8,753 $ 35,160 $ 48,399
Rocket Lab USA, Inc.        
Disaggregation of Revenue [Line Items]        
Total revenue by recognition model 29,472 8,753 35,160 48,399
Rocket Lab USA, Inc. | Launch Services [Member]        
Disaggregation of Revenue [Line Items]        
Total revenue by recognition model     33,085 48,399
Rocket Lab USA, Inc. | Space Systems [Member]        
Disaggregation of Revenue [Line Items]        
Total revenue by recognition model     2,075  
Rocket Lab USA, Inc. | Point-in-time        
Disaggregation of Revenue [Line Items]        
Total revenue by recognition model 26,815 7,534 33,903 26,361
Rocket Lab USA, Inc. | Point-in-time | Launch Services [Member]        
Disaggregation of Revenue [Line Items]        
Total revenue by recognition model     31,993 26,361
Rocket Lab USA, Inc. | Point-in-time | Space Systems [Member]        
Disaggregation of Revenue [Line Items]        
Total revenue by recognition model     1,910  
Rocket Lab USA, Inc. | Over time        
Disaggregation of Revenue [Line Items]        
Total revenue by recognition model $ 2,657 $ 1,219 1,257 22,038
Rocket Lab USA, Inc. | Over time | Launch Services [Member]        
Disaggregation of Revenue [Line Items]        
Total revenue by recognition model     1,092 $ 22,038
Rocket Lab USA, Inc. | Over time | Space Systems [Member]        
Disaggregation of Revenue [Line Items]        
Total revenue by recognition model     $ 165