Cover Page - shares	6 Months Ended
	Jun. 30, 2022	Aug. 08, 2022
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Period End Date	Jun. 30, 2022
Document Fiscal Period Focus	Q2
Entity Registrant Name	ROCKET LAB USA, INC.
Entity Central Index Key	0001819994
Entity File Number	001-39560
Entity Incorporation, State or Country Code	DE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		469,025,580
Entity Address, State or Province	CA
Document Quarterly Report	true
Document Transition Report	false
Entity Tax Identification Number	98-1550340
Entity Address, Address Line One	3881 McGowen Street
Entity Address, City or Town	Long Beach
Entity Address, Postal Zip Code	90808
City Area Code	714
Local Phone Number	465-5737
Common Stock [Member]
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	RKLB
Security Exchange Name	NASDAQ