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Stock-based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
12 Months Ended
Sep. 30, 2020
Sep. 29, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted- Average Grant Date Fair Value per Share, Granted $ 11.50 $ 11.50      
Rocket Lab USA, Inc.          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options to Purchase Common Stock, Outstanding     3,009,360 3,093,543  
Options to Purchase Common Stock, Granted     10,000 416,549  
Options to Purchase Common Stock, Exercised     (305,867) (152,247)  
Options to Purchase Common Stock, Forfeited     (166,479) (254,051)  
Options to Purchase Common Stock, Expired     (108,873) (94,434)  
Options to Purchase Common Stock, Outstanding     2,438,141 3,009,360 3,093,543
Options to Purchase Common Stock, Options vested and exercisable     1,626,906 1,310,763  
Weighted- Average Exercise Price per Share, Outstanding     $ 8.83 $ 8.08  
Weighted- Average Exercise Price per Share, Granted     12.80 11.83  
Weighted- Average Exercise Price per Share, Exercised     3.23 3.82  
Weighted- Average Exercise Price per Share, Forfeited     11.38 9.70  
Weighted- Average Exercise Price per Share, Expired     9.55 3.15  
Weighted- Average Exercise Price per Share, Outstanding     9.35 8.83 $ 8.08
Weighted- Average Exercise Price per Share, Options vested and exercisable     8.82 7.03  
Weighted- Average Grant Date Fair Value per Share, Outstanding     4.57 4.22  
Weighted- Average Grant Date Fair Value per Share, Granted     7.11 6.84  
Weighted- Average Grant Date Fair Value per Share, Outstanding     4.81 4.57 $ 4.22
Weighted- Average Grant Date Fair Value per Share, Options vested and exercisable     $ 4.44 $ 3.40  
Weighted- Average Remaining Contract Life (In Years), Exercised     3 days 5 hours 5 days 10 hours  
Weighted- Average Remaining Contract Life (In Years), Outstanding     7 days 2 hours 7 days 22 hours 8 days 16 hours
Weighted- Average Remaining Contract Life (In Years), Options vested and exercisable     6 days 19 hours 7 days 2 hours  
Aggregate Intrinsic Value, Exercised     $ 2,565 $ 1,366  
Aggregate Intrinsic Value, Outstanding     85,853 11,941 $ 9,131
Aggregate Intrinsic Value, Options vested and exercisable     $ 57,660 $ 7,552