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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 03, 2016 | Apr. 05, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | $ 430,994 |  | $ 342,401 |  |
Income (loss) before income taxes | [1],[2] | 57,192 |  | 42,438 |  |
Total assets |  | 2,548,974 | [3] | 2,512,182 | [3] | $ 2,548,674
Semiconductor Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 340,264 |  | 270,917 |  |
Income (loss) before income taxes | [1],[2] | 73,254 |  | 43,125 |  |
Total assets | [3] | 664,555 |  | 596,477 |  |
Wireless Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 20,314 |  | 34,048 |  |
Income (loss) before income taxes | [1],[2] | (20,140) |  | (10,441) |  |
Total assets | [3] | 408,466 |  | 465,465 |  |
System Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 53,670 |  | 37,436 |  |
Income (loss) before income taxes | [1],[2] | 9,492 |  | 1,005 |  |
Total assets | [3] | 90,695 |  | 94,133 |  |
Corporate And Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Income (loss) before income taxes | [1],[2] | 1,754 |  | 8,749 |  |
Total assets | [3] | 1,034,669 |  | $ 1,356,107 |  |
Industrial Automation |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 16,746 |  |  |  |
Income (loss) before income taxes | [1],[2] | (7,168) |  |  |  |
Total assets | [3] | $ 350,589 |  |  |  |
[1] | Included in the income (loss) before income taxes for each of the segments are charges related to inventory and other.
[2] | Interest income, interest expense, and other (income) expense, net 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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