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Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Revenues $ 494,099 $ 487,467  
Income (loss) before income taxes [1],[2] 93,979 95,820  
Total assets 2,616,643 [3] 2,995,193 [3] $ 2,706,606
Semiconductor Test      
Segment Reporting Information [Line Items]      
Revenues 340,853 373,328  
Income (loss) before income taxes [1],[2] 83,049 88,079  
Total assets [3] 770,967 758,737  
System Test      
Segment Reporting Information [Line Items]      
Revenues 58,220 43,019  
Income (loss) before income taxes [1],[2] 15,340 5,888  
Total assets [3] 98,916 90,785  
Industrial Automation      
Segment Reporting Information [Line Items]      
Revenues 66,136 48,834  
Income (loss) before income taxes [1],[2] 5,295 784  
Total assets [3] 596,899 406,557  
Wireless Test      
Segment Reporting Information [Line Items]      
Revenues 29,041 22,507  
Income (loss) before income taxes [1],[2] 3,628 464  
Total assets [3] 73,066 59,739  
Corporate And Others [Member]      
Segment Reporting Information [Line Items]      
Revenues (151) (221)  
Income (loss) before income taxes [1],[2] 2,743 605  
Total assets [3] $ 1,076,795 $ 1,679,375  
[1] Included in Corporate and Other are: contingent consideration adjustments, severance charges, interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations and acquisition related charges.
[2] Included in the income (loss) before income taxes for each of the segments are charges and credits related to restructuring and other and inventory charges.
[3] Total business assets are directly attributable to each business. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.