Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items]
Retained earnings		$ 706,514	$ 725,729
Standard warranty period		12 months
Depreciation over life to cost of revenues and selling and administrative expenses, years		6 years
Net book value of internally manufactured test systems sold		$ 2,800	6,600	$ 16,600
Advertising costs		15,500	17,300	13,400
Losses (gains) on foreign currency transactions		10,900	10,800	$ (2,100)
Trade Accounts Receivable		243,500	93,900
Retained earnings	$ 1,800
Additional paid-in capital		$ 1,827,274	$ 1,755,963
Teradyne [Member]
Summary Of Significant Accounting Policies [Line Items]
Retained earnings	94,600
Current debt	1,400
Debt	6,600
Mezzanine equity	100,800
Additional paid-in capital	100,800
Teradyne [Member] | Accounting Standards Update 2020-06 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Mezzanine equity	$ 0