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Significant Accounting Policies (Detail)
 3 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
shares
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
shares
Jun. 30, 2021
USD ($)
Segment
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Segment
shares
Dec. 31, 2019
USD ($)
Summary of Significant Accounting Policies Details [Line Items]              
Federal depository insurance coverage     $ 250,000,000 $ 250,000,000      
Accumulated deficit $ (59,362,823)   (12,341,951) (59,362,823)   $ (12,341,951)  
Net loss (1,059,094) $ (23,560,263) (12,341,951) (24,619,357)      
Net cash used in operating activities     (506,715) (821,057)      
Cash and cash equivalents $ 44,846   $ 865,903 $ 44,846   $ 865,903  
Class A ordinary shares [Member]              
Summary of Significant Accounting Policies Details [Line Items]              
Warrants to purchase | shares     16,266,667 16,266,667      
Shares Subject To Possible Redemption | shares 32,000,000   28,025,733 32,000,000   28,025,733  
Rocket Lab USA, Inc.              
Summary of Significant Accounting Policies Details [Line Items]              
Accumulated deficit $ (220,238,000)   $ (187,691,000) $ (220,238,000)   $ (187,691,000) $ (132,686,000)
Net loss       (32,547,000) $ (23,453,000) (55,005,000) (30,360,000)
Net cash used in operating activities       (36,582,000) $ (12,098,000) (27,757,000) (25,324,000)
Cash and cash equivalents 107,931,000   52,792,000 107,931,000   52,792,000 95,878,000
Capitalized transaction costs       3,395,000      
Deferred capitalized transaction costs 3,395,000     3,395,000      
Restricted cash     1,141,000     1,141,000 1,816,000
Impairments for long-lived assets           0 0
Impairment of goodwill           0  
Goodwill $ 3,277,000   $ 3,133,000 $ 3,277,000   $ 3,133,000 $ 0
Expected dividend yield           0.00% 0.00%
Number of operating segments | Segment       2   2  
Rocket Lab USA, Inc. | Research and development, net              
Summary of Significant Accounting Policies Details [Line Items]              
Grant proceeds           $ 3,695,000 $ 3,296,000
Rocket Lab USA, Inc. | Minimum [Member]              
Summary of Significant Accounting Policies Details [Line Items]              
Finite-lived intangible asset useful life           1 year  
Rocket Lab USA, Inc. | Maximum [Member]              
Summary of Significant Accounting Policies Details [Line Items]              
Finite-lived intangible asset useful life           20 years  
Percentage of research and development costs grant reimburse           20.00%