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Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Summary Of Significant Accounting Policies [Line Items]        
Retained earnings   $ 970,761 $ 706,514  
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   $ 4,000 2,800 $ 6,600
Advertising costs   16,100 15,500 17,300
Losses (gains) on foreign currency transactions   2,800 10,900 $ 10,800
Trade Accounts Receivable   129,000 243,500  
Retained earnings $ 1,800      
Additional paid-in capital   $ 1,909,538 $ 1,827,274  
Teradyne [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Retained earnings 94,600      
Current debt 1,400      
Debt 6,600      
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