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Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]          
Revenues $ 564,178 $ 526,929 $ 1,058,277 $ 1,014,396  
Income (loss) before income taxes [1],[2] 131,177 120,012 225,156 215,831  
Total assets 2,671,514 [3] 2,931,720 [3] 2,671,514 [3] 2,931,720 [3] $ 2,706,606
Semiconductor Test          
Segment Reporting Information [Line Items]          
Revenues 374,898 360,088 715,751 733,416  
Income (loss) before income taxes [1],[2] 91,355 91,159 174,404 179,238  
Total assets [3] 745,073 765,484 745,073 765,484  
System Test          
Segment Reporting Information [Line Items]          
Revenues 73,407 69,682 131,627 112,702  
Income (loss) before income taxes [1],[2] 23,535 20,352 38,875 26,240  
Total assets [3] 123,460 107,199 123,460 107,199  
Industrial Automation          
Segment Reporting Information [Line Items]          
Revenues 74,726 62,057 140,862 110,891  
Income (loss) before income taxes [1],[2] (3,730) (2,922) (9,025) (2,138)  
Total assets [3] 601,676 597,293 601,676 597,293  
Wireless Test          
Segment Reporting Information [Line Items]          
Revenues 41,236 35,212 70,277 57,719  
Income (loss) before income taxes [1],[2] 10,930 10,308 14,558 10,772  
Total assets [3] 93,232 77,638 93,232 77,638  
Corporate And Others [Member]          
Segment Reporting Information [Line Items]          
Revenues (89) (110) (240) (332)  
Income (loss) before income taxes [1],[2] 9,087 1,115 6,344 1,719  
Total assets [3] $ 1,108,073 $ 1,384,106 $ 1,108,073 $ 1,384,106  
[1] Included in Corporate and Other are: contingent consideration adjustments, severance charges, interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, acquisition related charges, and pension and postretirement plans actuarial losses.
[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.