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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 02, 2017 | Jul. 03, 2016 | Jul. 02, 2017 | Jul. 03, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 696,901 |  | $ 531,792 |  | $ 1,153,814 |  | $ 962,787 |  |
Income (loss) before income taxes | [1],[2] | 206,877 |  | (230,817) |  | 298,893 |  | (173,625) |  |
Total assets |  | 3,030,225 | [3] | 2,407,858 | [3] | 3,030,225 | [3] | 2,407,858 | [3] | $ 2,762,493
Semiconductor Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 593,152 |  | 435,323 |  | 948,679 |  | 775,588 |  |
Income (loss) before income taxes | [1],[2] | 211,278 |  | 121,163 |  | 309,244 |  | 194,417 |  |
Total assets | [3] | 766,395 |  | 731,394 |  | 766,395 |  | 731,394 |  |
Industrial Automation |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 39,337 |  | 25,102 |  | 75,610 |  | 41,848 |  |
Income (loss) before income taxes | [1],[2] | (1,081) |  | (4,501) |  | (3,652) |  | (11,669) |  |
Total assets | [3] | 349,023 |  | 346,290 |  | 349,023 |  | 346,290 |  |
System Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 36,732 |  | 48,940 |  | 76,578 |  | 102,610 |  |
Income (loss) before income taxes | [1],[2] | (5,692) |  | 8,992 |  | (8,451) |  | 18,484 |  |
Total assets | [3] | 108,083 |  | 91,374 |  | 108,083 |  | 91,374 |  |
Wireless Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 27,680 |  | 22,427 |  | 52,947 |  | 42,741 |  |
Income (loss) before income taxes | [1],[2] | 4,514 |  | (356,505) |  | 6,046 |  | (376,645) |  |
Total assets | [3] | 62,900 |  | 61,618 |  | 62,900 |  | 61,618 |  |
Corporate And Eliminations |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes | [1],[2] | (2,142) |  | 34 |  | (4,294) |  | 1,788 |  |
Total assets | [3] | $ 1,743,824 |  | $ 1,177,182 |  | $ 1,743,824 |  | $ 1,177,182 |  |
[1] | Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges, goodwill impairment charges and acquired intangible assets impairment charge.
[2] | Interest income, interest expense, contingent consideration adjustments, pension and postretirement plan actuarial gains and other income (expense) are included in Corporate and Eliminations.
[3] | Total business assets are attributable to each business. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.

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