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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 05, 2015 | Jun. 29, 2014 | Jul. 05, 2015 | Jun. 29, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 512,739 |  | $ 525,567 |  | $ 855,140 |  | $ 846,577 |  |
Income (loss) before income taxes | [1],[2] | 132,136 |  | 121,392 |  | 174,574 |  | 119,519 |  |
Total assets |  | 2,692,807 | [3] | 2,630,663 | [3] | 2,692,807 | [3] | 2,630,663 | [3] | $ 2,538,520
Semiconductor Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 400,315 |  | 421,434 |  | 671,232 |  | 683,171 |  |
Income (loss) before income taxes | [1],[2] | 129,546 |  | 107,270 |  | 172,671 |  | 141,870 |  |
Total assets | [3] | 649,087 |  | 747,492 |  | 649,087 |  | 747,492 |  |
Wireless Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 62,879 |  | 68,699 |  | 96,927 |  | 89,909 |  |
Income (loss) before income taxes | [1],[2] | 6,841 |  | 14,229 |  | (3,600) |  | (10,856) |  |
Total assets | [3] | 485,857 |  | 638,012 |  | 485,857 |  | 638,012 |  |
System Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 45,822 |  | 35,434 |  | 83,258 |  | 73,497 |  |
Income (loss) before income taxes | [1],[2] | (4,333) |  | (715) |  | (3,328) |  | (267) |  |
Total assets | [3] | 95,544 |  | 71,644 |  | 95,544 |  | 71,644 |  |
Corporate And Eliminations |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes | [1],[2] | 1,782 |  | 608 |  | 10,531 |  | (11,228) |  |
Total assets | [3] | 1,104,043 |  | $ 1,173,515 |  | 1,104,043 |  | $ 1,173,515 |  |
Industrial Automation |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 3,723 |  |  |  | 3,723 |  |  |  |
Income (loss) before income taxes | [1],[2] | (1,700) |  |  |  | (1,700) |  |  |  |
Total assets | [3] | $ 358,276 |  |  |  | $ 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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