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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 01, 2017 | Oct. 02, 2016 | Oct. 01, 2017 | Oct. 02, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 503,378 |  | $ 410,475 |  | $ 1,657,191 |  | $ 1,373,261 |  |
Income (loss) before income taxes | [1],[2] | 127,437 |  | 59,681 |  | 426,329 |  | (113,945) |  |
Total assets |  | 3,089,327 | [3] | 2,365,687 | [3] | 3,089,327 | [3] | 2,365,687 | [3] | $ 2,762,493
Semiconductor Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 396,881 |  | 322,021 |  | 1,345,560 |  | 1,097,608 |  |
Income (loss) before income taxes | [1],[2] | 116,836 |  | 67,710 |  | 426,081 |  | 262,127 |  |
Total assets | [3] | 598,925 |  | 522,529 |  | 598,925 |  | 522,529 |  |
Industrial Automation |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 40,063 |  | 23,505 |  | 115,672 |  | 65,353 |  |
Income (loss) before income taxes | [1],[2] | 3,373 |  | (4,695) |  | (279) |  | (16,364) |  |
Total assets | [3] | 508,943 |  | 340,030 |  | 508,943 |  | 340,030 |  |
System Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 35,569 |  | 37,030 |  | 112,147 |  | 139,640 |  |
Income (loss) before income taxes | [1],[2] | (3,344) |  | 1,550 |  | (11,795) |  | 20,033 |  |
Total assets | [3] | 100,083 |  | 90,713 |  | 100,083 |  | 90,713 |  |
Wireless Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 30,865 |  | 27,919 |  | 83,812 |  | 70,660 |  |
Income (loss) before income taxes | [1],[2] | 7,461 |  | 1,049 |  | 13,508 |  | (375,596) |  |
Total assets | [3] | 61,206 |  | 65,953 |  | 61,206 |  | 65,953 |  |
Corporate And Eliminations |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes | [1],[2] | 3,111 |  | (5,933) |  | (1,186) |  | (4,145) |  |
Total assets | [3] | $ 1,820,170 |  | $ 1,346,462 |  | $ 1,820,170 |  | $ 1,346,462 |  |
[1] | Included in Corporate and Eliminations are: contingent consideration adjustments, pension and postretirement plans' actuarial gains (losses), impairment of fixed assets and expenses related to the Japan earthquake, property insurance recovery, interest income, interest expense and net foreign exchange gains (losses).
[2] | Included in income (loss) before income taxes are charges and credits related to restructuring and other, inventory charges, a goodwill impairment charge and an acquired intangible assets impairment charge.
[3] | Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.

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