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Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Revenues [1] $ 2,100,802 $ 2,136,606 $ 1,753,250
Income (loss) before taxes [2],[3] 467,801 524,411 (55,060)
Total assets [4] 2,706,606 3,109,545 2,762,493
Property additions 114,379 105,375 85,272
Depreciation and amortization expense 113,224 108,075 120,009
Semiconductor Test      
Segment Reporting Information [Line Items]      
Revenues 1,492,417 1,662,549 1,368,169
Income (loss) before taxes [2],[3] 397,645 491,361 311,939
Total assets [4] 669,452 597,480 557,546
Property additions 94,496 87,920 70,543
Depreciation and amortization expense 58,095 58,901 58,087
System Test      
Segment Reporting Information [Line Items]      
Revenues 216,132 192,135 189,846
Income (loss) before taxes [2],[3] 48,857 10,305 28,916
Total assets [4] 88,098 97,018 110,361
Property additions 3,469 5,976 3,788
Depreciation and amortization expense 6,430 6,646 6,551
Industrial Automation      
Segment Reporting Information [Line Items]      
Revenues 261,452 170,056 99,031
Income (loss) before taxes [2],[3] 7,670 8,763 (16,783)
Total assets [4] 607,502 368,037 317,635
Property additions 11,188 7,044 6,755
Depreciation and amortization expense 36,755 25,711 26,869
Wireless Test      
Segment Reporting Information [Line Items]      
Revenues 132,006 111,866 96,204
Income (loss) before taxes [2],[3] 29,052 17,350 (371,409)
Total assets [4] 77,570 59,912 62,366
Property additions 5,226 4,435 4,186
Depreciation and amortization expense 5,328 5,392 25,921
Corporate And Eliminations      
Segment Reporting Information [Line Items]      
Revenues (1,205)    
Income (loss) before taxes [2],[3] (15,423) (3,368) (7,723)
Total assets [4] 1,263,984 1,987,098 1,714,585
Depreciation and amortization expense $ 6,616 $ 11,425 $ 2,581
[1] Revenues attributable to a country are based on location of customer site.
[2] Included in Corporate and Other are: contingent consideration adjustments, pension and postretirement plans actuarial gains (losses), severance charges, impairment of fixed assets and expenses related to the Japan earthquake, property insurance recovery, interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations and acquisition related charges.
[3] Included in income (loss) before taxes are charges and credits related to restructuring and other, and inventory charges. In 2016, loss before income taxes in Wireless Test also included charges related to goodwill and acquired intangible assets impairment.
[4] Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.