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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

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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