Description Of The Business - Additional Information (Detail) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Aug. 25, 2021 USD ($) $ / shares shares	Jun. 30, 2021 USD ($) shares	Mar. 31, 2021 USD ($) shares	Jun. 30, 2022 $ / shares shares	Mar. 31, 2022 shares	Dec. 31, 2021 $ / shares shares	Dec. 22, 2021 $ / shares	Dec. 31, 2020 shares
Description Of The Business [Line Items]
Exercise of stock options | $		$ 230	$ 542
Shares, outstanding				447,919,591
Common stock shares, issued				468,377,065		468,377,065
Number of securities called by each warrant or right				2,951,781
Exercise price of warrants or rights | $ / shares							$ 11.50
Common stock, par value | $ / shares				$ 0.0001		$ 0.0001
Stockholders' equity note, stock split, exchange ratio				9.059659
Share Price Equal Or Exceeds Twenty Rupees Per Dollar [Member]
Description Of The Business [Line Items]
Fair value per share of common stock | $ / shares				$ 20.00
Issuance of common stock for acquisition, Shares				32,150,757
Share Price Equal Or Exceeds Twenty Rupees Per Dollar [Member] | Minimum [Member]
Description Of The Business [Line Items]
Number Of Consecutive Trading Days For Determining Share Price				20 days
Share Price Equal Or Exceeds Twenty Rupees Per Dollar [Member] | Maximum [Member]
Description Of The Business [Line Items]
Number Of Consecutive Trading Days For Determining Share Price				30 days
Number Of Trading Days For Determining Share Price				30 days
Post Combination Company [Member]
Description Of The Business [Line Items]
Fair value per share of common stock | $ / shares	$ 10.00
Stock Issued During Period, Shares, New Issues	46,700,000
Common stock shares, issued				46,700,000
Vector Warrants [Member]
Description Of The Business [Line Items]
Number of securities called by each warrant or right				16,266,666
Exercise price of warrants or rights | $ / shares				$ 11.50
Legacy Rocket Lab Warrants [Member]
Description Of The Business [Line Items]
Number of securities called by each warrant or right				891,380
Exercise price of warrants or rights | $ / shares				$ 0.29
Legacy Rocket Lab Common Stock [Member]
Description Of The Business [Line Items]
Shares issued				362,188,208
Legacy Rocket Lab Common Stock [Member] | Post Combination Company [Member]
Description Of The Business [Line Items]
Stock repurchased during period, value | $	$ 40,000
Share-based compensation arrangement by share-based payment award	10,000
Share-based payment arrangement, plan modification, incremental cost | $	$ 9,642
Post Combination Company Common Stock [Member]
Description Of The Business [Line Items]
Number of shares issued under share-based payment arrangement.				1,915,356
Post Combination Company Common Stock [Member] | Restricted Stock Units (RSUs) [Member]
Description Of The Business [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period				14,903,640
Share-based compensation arrangement by share-based payment award, maximum number of shares per employee				4,065,304
Number of shares issued under share-based payment arrangement.				1,915,356
Post Combination Company Common Stock [Member] | Legacy Rocket Lab Warrants [Member]
Description Of The Business [Line Items]
Share-based compensation arrangement by share-based payment award				17,961,684
Share-based compensation arrangement by share-based payment award, per share weighted average price of shares purchased | $ / shares				$ 1.04
Number of options vested				14,253,283
Pipe Investment [Member]
Description Of The Business [Line Items]
Exercise of stock options | $	$ 467,000
Common Class A [Member]
Description Of The Business [Line Items]
Shares issued				31,031,383
Stock redeemed or called during period, shares				968,617
Common Class A [Member] | Post Combination Company [Member]
Description Of The Business [Line Items]
Number of share options exercised during the current period.	968,617
Fair value per share of common stock | $ / shares	$ 10.00
Exercise of stock options | $	$ 9,686
Conversion of stock, shares converted	31,031,383
Common Class B [Member]
Description Of The Business [Line Items]
Shares issued				8,000,000
Common Class B [Member] | Post Combination Company [Member]
Description Of The Business [Line Items]
Conversion of stock, shares converted	8,000,000
Redeemable Convertible Preferred Stock [Member]
Description Of The Business [Line Items]
Shares, outstanding		283,843,764	283,843,764	0	0	0		31,330,513
Redeemable Convertible Preferred Stock [Member] | Legacy Rocket Lab Common Stock [Member] | Post Combination Company [Member]
Description Of The Business [Line Items]
Convertible preferred stock, shares issued upon conversion	362,188,208
Preferred stock, convertible, conversion ratio | $ / shares	$ 9.059659