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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 29, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 582,038 |  | $ 566,848 |  | $ 1,640,315 |  | $ 1,581,244 |  |
Income (loss) before income taxes | [1],[2] | 151,733 |  | 140,844 |  | 376,889 |  | 356,675 |  |
Total assets |  | 2,698,791 | [3] | 2,882,487 | [3] | 2,698,791 | [3] | 2,882,487 | [3] | $ 2,706,606
Semiconductor Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 397,737 |  | 417,297 |  | 1,113,489 |  | 1,150,712 |  |
Income (loss) before income taxes | [1],[2] | 116,633 |  | 126,638 |  | 291,037 |  | 305,876 |  |
Total assets | [3] | 757,422 |  | 709,616 |  | 757,422 |  | 709,616 |  |
System Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 73,305 |  | 49,606 |  | 204,934 |  | 162,308 |  |
Income (loss) before income taxes | [1],[2] | 24,381 |  | 9,056 |  | 63,254 |  | 35,296 |  |
Total assets | [3] | 126,452 |  | 83,160 |  | 126,452 |  | 83,160 |  |
Industrial Automation |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 68,892 |  | 65,913 |  | 209,753 |  | 176,803 |  |
Income (loss) before income taxes | [1],[2] | (1,645) |  | 940 |  | (10,670) |  | (1,198) |  |
Total assets | [3] | 580,635 |  | 617,741 |  | 580,635 |  | 617,741 |  |
Wireless Test |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | 42,264 |  | 34,304 |  | 112,541 |  | 92,023 |  |
Income (loss) before income taxes | [1],[2] | 11,182 |  | 7,843 |  | 25,740 |  | 18,615 |  |
Total assets | [3] | 94,789 |  | 79,986 |  | 94,789 |  | 79,986 |  |
Corporate And Others [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  | (160) |  | (272) |  | (402) |  | (602) |  |
Income (loss) before income taxes | [1],[2] | 1,182 |  | (3,633) |  | 7,528 |  | (1,914) |  |
Total assets | [3] | $ 1,139,493 |  | $ 1,391,984 |  | $ 1,139,493 |  | $ 1,391,984 |  |
[1] | Included in Corporate and Other are: contingent consideration adjustments, severance charges, interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, acquisition related charges, and pension and postretirement plans actuarial losses.
[2] | Included in the income (loss) before income taxes for each of the segments are charges and credits related to restructuring and other and inventory charges.
[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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