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Property, Plant and Equipment, Net - Schedule of Depreciation Expense (Detail) - Rocket Lab USA, Inc. - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |  |
Total depreciation expense | $ 3,555 | $ 2,998 | $ 6,534 | $ 4,077
Cost of revenues |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Total depreciation expense | 1,977 | 1,941 | 4,527 | 3,310
Research and development, net |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Total depreciation expense | 116 | 119 | 416 | 190
Selling, general and administrative |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Total depreciation expense | $ 1,462 | $ 938 | $ 1,591 | $ 577

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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