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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.

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