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Leases - Supplemental Balance Sheet Information Related to Leases (Detail) - Rocket Lab USA, Inc. - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Leased Assets [Line Items]      
Total lease liabilities, current   $ 1,670 $ 3,247
Operating lease liabilities, non-current lease liabilities $ 25,916 27,299 26,025
Total lease liabilities, non-current   28,969 29,272
Other Current Liabilities      
Operating Leased Assets [Line Items]      
Operating lease liabilities, current   1,670 1,001
Finance Lease Liabilities      
Operating Leased Assets [Line Items]      
Finance lease liabilities, current   0 2,246
NonCurrent Lease Liabilities [Member]      
Operating Leased Assets [Line Items]      
Operating lease liabilities, non-current lease liabilities   $ 27,299 $ 26,025