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Leases - Supplemental Cash Flow Information Related to lease (Detail) - Rocket Lab USA, Inc. - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 2,080	$ 2,301
Operating cash flows from finance leases	95	9
Finance cash flows from finance leases	0	737
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	2,410	20,011
Finance leases	$ 0	$ 2,974

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Right of Use Assets Obtained in Exchange for Lease Obligations [Abstract]

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Amount of interest paid on finance lease liability.

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Amount of cash outflow for principal payment on finance lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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