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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 03, 2016 | Jul. 05, 2015 | Jul. 03, 2016 | Jul. 05, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 531,792 |  | $ 512,739 |  | $ 962,787 |  | $ 855,140 |  |
Income (loss) before income taxes | [1],[2] | (230,817) |  | 132,136 |  | (173,625) |  | 174,574 |  |
Total assets |  | 2,407,858 | [3] | 2,692,807 | [3] | 2,407,858 | [3] | 2,692,807 | [3] | $ 2,548,674
Semiconductor Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 435,323 |  | 400,315 |  | 775,588 |  | 671,232 |  |
Income (loss) before income taxes | [1],[2] | 121,163 |  | 129,546 |  | 194,417 |  | 172,671 |  |
Total assets | [3] | 731,394 |  | 649,087 |  | 731,394 |  | 649,087 |  |
Wireless Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 22,427 |  | 62,879 |  | 42,741 |  | 96,927 |  |
Income (loss) before income taxes | [1],[2] | (356,505) |  | 6,841 |  | (376,645) |  | (3,600) |  |
Total assets | [3] | 61,618 |  | 485,857 |  | 61,618 |  | 485,857 |  |
System Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 48,940 |  | 45,822 |  | 102,610 |  | 83,258 |  |
Income (loss) before income taxes | [1],[2] | 8,992 |  | (4,333) |  | 18,484 |  | (3,328) |  |
Total assets | [3] | 91,374 |  | 95,544 |  | 91,374 |  | 95,544 |  |
Corporate And Eliminations |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes | [1],[2] | 34 |  | 1,782 |  | 1,788 |  | 10,531 |  |
Total assets | [3] | 1,177,182 |  | 1,104,043 |  | 1,177,182 |  | 1,104,043 |  |
Industrial Automation |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 25,102 |  | 3,723 |  | 41,848 |  | 3,723 |  |
Income (loss) before income taxes | [1],[2] | (4,501) |  | (1,700) |  | (11,669) |  | (1,700) |  |
Total assets | [3] | $ 346,290 |  | $ 358,276 |  | $ 346,290 |  | $ 358,276 |  |
[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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