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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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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044

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