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Revenue - Changes in Contract Liabilities (Detail) - Rocket Lab USA, Inc. - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Contract liabilities, beginning of year | $ 26,132 | $ 10,211 | $ 11,590
Customer advances received | 17,116 | 24,694 | 8,672
Recognition of unearned revenue | (12,110) | (8,773) | (10,051)
Contract liabilities, end of year | $ 31,138 | $ 26,132 | $ 10,211

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