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Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Summary Of Significant Accounting Policies [Line Items]        
Increase (decrease) in adoption of new accounting guidance amount $ 387,414 $ (241,918)    
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 $ 7,300 5,000 $ 3,800  
Advertising costs 12,800 16,600 15,400  
Losses (gains) on foreign currency transactions (2,600) 1,600 $ 2,500  
Trade Accounts Receivable $ 131,100 $ 143,600    
Retained Earnings | ASU 2016-01        
Summary Of Significant Accounting Policies [Line Items]        
Increase (decrease) in adoption of new accounting guidance amount       $ 3,100
Accumulated Other Comprehensive Income (Loss) | ASU 2016-01        
Summary Of Significant Accounting Policies [Line Items]        
Increase (decrease) in adoption of new accounting guidance amount       $ 3,100