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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 02, 2017 | Apr. 03, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | $ 456,913 |  | $ 430,994 |  |
Income (loss) before income taxes | [1],[2] | 92,016 |  | 57,192 |  |
Total assets |  | 2,842,280 | [3] | 2,548,974 | [3] | $ 2,762,493
Semiconductor Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 355,528 |  | 340,264 |  |
Income (loss) before income taxes | [1],[2] | 97,966 |  | 73,254 |  |
Total assets | [3] | 740,334 |  | 664,555 |  |
System Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 39,845 |  | 53,670 |  |
Income (loss) before income taxes | [1],[2] | (2,759) |  | 9,492 |  |
Total assets | [3] | 106,754 |  | 90,695 |  |
Wireless Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 25,268 |  | 20,314 |  |
Income (loss) before income taxes | [1],[2] | 1,532 |  | (20,140) |  |
Total assets | [3] | 61,356 |  | 408,466 |  |
Industrial Automation |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 36,272 |  | 16,746 |  |
Income (loss) before income taxes | [1],[2] | (2,571) |  | (7,168) |  |
Total assets | [3] | 331,016 |  | 350,589 |  |
Corporate And Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Income (loss) before income taxes | [1],[2] | (2,152) |  | 1,754 |  |
Total assets | [3] | $ 1,602,820 |  | $ 1,034,669 |  |
[1] | Included in the income (loss) before income taxes for each of the segments are charges and credits related to inventory and other.
[2] | Interest income, interest expense, contingent consideration adjustments, pension and post retirement plans actuarial gains and other income (expense) are included in Corporate and Eliminations.
[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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