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Leases - Additional Information (Detail) - Rocket Lab USA, Inc. - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2019 | Dec. 31, 2020 | Jun. 30, 2021 | Dec. 31, 2019
Operating Leased Assets [Line Items] |  |  |  |
Weighted average remaining lease term related to operating leases |  | 12 years 1 month 6 days |  | 11 years 8 months 12 days
Weighted average discount rate related to operating leases |  | 5.50% |  | 5.40%
Weighted average remaining lease term related to finance leases |  |  |  | 10 months 24 days
Weighted average discount rate related to finance leases |  |  |  | 5.00%
Properties,Vehicles and Equipment [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Lessee, Operating Lease, Option to Extend |  | one year |  |
Properties,Vehicles and Equipment [Member] | Minimum [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Lessee, Operating Lease, Remaining Lease Term |  | 1 year | 1 year |
Properties,Vehicles and Equipment [Member] | Maximum [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Lessee, Operating Lease, Remaining Lease Term |  | 18 years | 18 years |
Premises [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease, commencement date | Apr. 01, 2020 |  |  |
Operating lease, expiration date | Jun. 30, 2027 |  |  |
Initial lease term | 87 months |  |  |
Tenant allowance, net of construction management fee | $ 454 |  |  |
Options to renew lease | two five-year periods |  |  |
Premises [Member] | Prepaid Rent [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Security deposits | $ 124 |  |  |

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- Definition Weighted average discount rate for finance lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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- Definition Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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