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Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 02, 2017
Apr. 03, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Revenues $ 456,913 $ 430,994  
Income (loss) before income taxes [1],[2] 92,016 57,192  
Total assets 2,842,280 [3] 2,548,974 [3] $ 2,762,493
Semiconductor Test      
Segment Reporting Information [Line Items]      
Revenues 355,528 340,264  
Income (loss) before income taxes [1],[2] 97,966 73,254  
Total assets [3] 740,334 664,555  
System Test      
Segment Reporting Information [Line Items]      
Revenues 39,845 53,670  
Income (loss) before income taxes [1],[2] (2,759) 9,492  
Total assets [3] 106,754 90,695  
Wireless Test      
Segment Reporting Information [Line Items]      
Revenues 25,268 20,314  
Income (loss) before income taxes [1],[2] 1,532 (20,140)  
Total assets [3] 61,356 408,466  
Industrial Automation      
Segment Reporting Information [Line Items]      
Revenues 36,272 16,746  
Income (loss) before income taxes [1],[2] (2,571) (7,168)  
Total assets [3] 331,016 350,589  
Corporate And Eliminations      
Segment Reporting Information [Line Items]      
Income (loss) before income taxes [1],[2] (2,152) 1,754  
Total assets [3] $ 1,602,820 $ 1,034,669  
[1] Included in the income (loss) before income taxes for each of the segments are charges and credits related to inventory and other.
[2] Interest income, interest expense, contingent consideration adjustments, pension and post retirement plans actuarial gains and other income (expense) are included in Corporate and Eliminations.
[3] Total business assets are directly attributable to each business. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.