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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | [2] | $ 2,294,965 | [1] | $ 2,100,802 | [1] | $ 2,136,606
Income (loss) before taxes | [3],[4] | 525,772 |  | 467,801 |  | 524,411
Total assets | [5] | 2,787,014 |  | 2,706,606 |  | 3,109,545
Property additions |  | 134,642 |  | 114,379 |  | 105,375
Depreciation and amortization expense |  | 120,655 |  | 113,224 |  | 108,075
Semiconductor Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 1,552,571 |  | 1,492,417 |  | 1,662,549
Income (loss) before taxes | [3],[4] | 416,973 |  | 397,645 |  | 491,361
Total assets | [5] | 784,808 |  | 669,452 |  | 597,480
Property additions |  | 112,145 |  | 94,496 |  | 87,920
Depreciation and amortization expense |  | 59,197 |  | 58,095 |  | 58,901
System Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 287,455 | [1] | 216,132 | [1] | 192,135
Income (loss) before taxes | [3],[4] | 93,543 |  | 48,857 |  | 10,305
Total assets | [5] | 131,428 |  | 88,098 |  | 97,018
Property additions |  | 3,059 |  | 3,469 |  | 5,976
Depreciation and amortization expense |  | 5,518 |  | 6,430 |  | 6,646
Industrial Automation |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 298,139 |  | 261,452 |  | 170,056
Income (loss) before taxes | [3],[4] | (5,916) |  | 7,670 |  | 8,763
Total assets | [5] | 671,559 |  | 607,502 |  | 368,037
Property additions |  | 9,076 |  | 11,188 |  | 7,044
Depreciation and amortization expense |  | 40,904 |  | 36,755 |  | 25,711
Wireless Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 157,315 | [1] | 132,006 | [1] | 111,866
Income (loss) before taxes | [3],[4] | 35,585 |  | 29,052 |  | 17,350
Total assets | [5] | 97,299 |  | 77,570 |  | 59,912
Property additions |  | 10,362 |  | 5,226 |  | 4,435
Depreciation and amortization expense |  | 5,365 |  | 5,328 |  | 5,392
Corporate And Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | (515) |  | (1,205) |  |
Income (loss) before taxes | [3],[4] | (14,413) |  | (15,423) |  | (3,368)
Total assets | [5] | 1,101,920 |  | 1,263,984 |  | 1,987,098
Depreciation and amortization expense |  | $ 9,671 |  | $ 6,616 |  | $ 11,425
[1] | Restructuring and other includes a $5.8 million gain for the decrease in the fair value adjustment to the MiR acquisition contingent consideration, partially offset by a $3.0 million fair value adjustment to increase the AutoGuide acquisition contingent consideration, $0.5 million of employee severance charges and $0.2 million of acquisition related expenses and compensation.
[2] | Revenues attributable to a country are based on location of customer site.
[3] | Included in Corporate and Other are: contingent consideration adjustments, investment impairment, pension and postretirement plans actuarial gains (losses), severance charges, property insurance recovery related to the Japan earthquake, interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations and acquisition related charges.
[4] | 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.
[5] | 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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