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Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Revenues $ 503,378 $ 410,475 $ 1,657,191 $ 1,373,261  
Income (loss) before income taxes [1],[2] 127,437 59,681 426,329 (113,945)  
Total assets 3,089,327 [3] 2,365,687 [3] 3,089,327 [3] 2,365,687 [3] $ 2,762,493
Semiconductor Test          
Segment Reporting Information [Line Items]          
Revenues 396,881 322,021 1,345,560 1,097,608  
Income (loss) before income taxes [1],[2] 116,836 67,710 426,081 262,127  
Total assets [3] 598,925 522,529 598,925 522,529  
Industrial Automation          
Segment Reporting Information [Line Items]          
Revenues 40,063 23,505 115,672 65,353  
Income (loss) before income taxes [1],[2] 3,373 (4,695) (279) (16,364)  
Total assets [3] 508,943 340,030 508,943 340,030  
System Test          
Segment Reporting Information [Line Items]          
Revenues 35,569 37,030 112,147 139,640  
Income (loss) before income taxes [1],[2] (3,344) 1,550 (11,795) 20,033  
Total assets [3] 100,083 90,713 100,083 90,713  
Wireless Test          
Segment Reporting Information [Line Items]          
Revenues 30,865 27,919 83,812 70,660  
Income (loss) before income taxes [1],[2] 7,461 1,049 13,508 (375,596)  
Total assets [3] 61,206 65,953 61,206 65,953  
Corporate And Eliminations          
Segment Reporting Information [Line Items]          
Income (loss) before income taxes [1],[2] 3,111 (5,933) (1,186) (4,145)  
Total assets [3] $ 1,820,170 $ 1,346,462 $ 1,820,170 $ 1,346,462  
[1] Included in Corporate and Eliminations are: contingent consideration adjustments, pension and postretirement plans' actuarial gains (losses), impairment of fixed assets and expenses related to the Japan earthquake, property insurance recovery, interest income, interest expense and net foreign exchange gains (losses).
[2] Included in income (loss) before income taxes are charges and credits related to restructuring and other, inventory charges, a goodwill impairment charge and an acquired intangible assets impairment charge.
[3] Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.