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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Apr. 01, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | $ 494,099 |  | $ 487,467 |  |
Income (loss) before income taxes | [1],[2] | 93,979 |  | 95,820 |  |
Total assets |  | 2,616,643 | [3] | 2,995,193 | [3] | $ 2,706,606
Semiconductor Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 340,853 |  | 373,328 |  |
Income (loss) before income taxes | [1],[2] | 83,049 |  | 88,079 |  |
Total assets | [3] | 770,967 |  | 758,737 |  |
System Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 58,220 |  | 43,019 |  |
Income (loss) before income taxes | [1],[2] | 15,340 |  | 5,888 |  |
Total assets | [3] | 98,916 |  | 90,785 |  |
Industrial Automation |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 66,136 |  | 48,834 |  |
Income (loss) before income taxes | [1],[2] | 5,295 |  | 784 |  |
Total assets | [3] | 596,899 |  | 406,557 |  |
Wireless Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 29,041 |  | 22,507 |  |
Income (loss) before income taxes | [1],[2] | 3,628 |  | 464 |  |
Total assets | [3] | 73,066 |  | 59,739 |  |
Corporate And Others [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | (151) |  | (221) |  |
Income (loss) before income taxes | [1],[2] | 2,743 |  | 605 |  |
Total assets | [3] | $ 1,076,795 |  | $ 1,679,375 |  |
[1] | Included in Corporate and Other are: contingent consideration adjustments, severance charges, interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations and acquisition related charges.
[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.

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