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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 04, 2015 | Sep. 28, 2014 | Oct. 04, 2015 | Sep. 28, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 465,994 |  | $ 478,010 |  | $ 1,321,133 |  | $ 1,324,587 |  |
Income (loss) before income taxes | [1],[2] | 87,408 |  | 100,670 |  | 261,981 |  | 220,189 |  |
Total assets |  | 2,661,884 | [3] | 2,695,007 | [3] | 2,661,884 | [3] | 2,695,007 | [3] | $ 2,538,520
Semiconductor Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 325,516 |  | 380,083 |  | 996,748 |  | 1,063,254 |  |
Income (loss) before income taxes | [1],[2] | 73,957 |  | 91,900 |  | 246,627 |  | 233,770 |  |
Total assets | [3] | 591,445 |  | 748,499 |  | 591,445 |  | 748,499 |  |
Wireless Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 55,359 |  | 54,838 |  | 152,285 |  | 144,747 |  |
Income (loss) before income taxes | [1],[2] | 2,997 |  | 2,379 |  | (603) |  | (8,477) |  |
Total assets | [3] | 447,461 |  | 614,911 |  | 447,461 |  | 614,911 |  |
System Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 69,062 |  | 43,089 |  | 152,320 |  | 116,586 |  |
Income (loss) before income taxes | [1],[2] | 13,751 |  | 5,779 |  | 10,423 |  | 5,512 |  |
Total assets | [3] | 109,078 |  | 83,769 |  | 109,078 |  | 83,769 |  |
Corporate And Eliminations |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes | [1],[2] | 1,550 |  | 612 |  | 12,081 |  | (10,616) |  |
Total assets | [3] | 1,153,832 |  | $ 1,247,828 |  | 1,153,832 |  | $ 1,247,828 |  |
Industrial Automation |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 16,057 |  |  |  | 19,780 |  |  |  |
Income (loss) before income taxes | [1],[2] | (4,847) |  |  |  | (6,547) |  |  |  |
Total assets | [3] | $ 360,068 |  |  |  | $ 360,068 |  |  |  |
[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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