Schedule of Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
U.S.		$ 307,997	$ 385,968	$ 403,451
Non-U.S.		217,575	454,417	757,504
Income before income taxes	[1],[2]	$ 525,572	$ 840,385	$ 1,160,955

[1] Included in Corporate and Eliminations are interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, pension and postretirement plan actuarial gains (losses), legal and environmental fees, contingent consideration adjustments, acquisition and divestiture related expenses, contract termination settlement charge, an expense for the modification of Teradyne's former chief executive officer's outstanding equity awards, and loss on convertible debt conversions in 2021.

[2] Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges and loss on convertible debt conversions in 2021.