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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 28, 2020 | Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues | $ 838,661 | [1] | $ 564,178 | [1] | $ 1,543,016 | [2] | $ 1,058,277 | [2] |
Income (loss) before income taxes | 217,291 |  | 131,177 |  | 414,359 |  | 225,156 |  |
Total assets | 3,249,189 |  | 2,671,514 |  | 3,249,189 |  | 2,671,514 |  | $ 2,787,014
Semiconductor Test |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 659,147 |  | 374,898 |  | 1,143,636 |  | 715,751 |  |
Income (loss) before income taxes | 228,787 |  | 91,355 |  | 382,603 |  | 174,404 |  |
Total assets | 1,192,355 |  | 745,073 |  | 1,192,355 |  | 745,073 |  |
System Test |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 71,806 | [1] | 73,407 | [1] | 187,882 | [2] | 131,627 | [2] |
Income (loss) before income taxes | 19,193 |  | 23,535 |  | 67,600 |  | 38,875 |  |
Total assets | 126,164 |  | 123,460 |  | 126,164 |  | 123,460 |  |
Industrial Automation |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 58,776 |  | 74,726 |  | 119,081 |  | 140,862 |  |
Income (loss) before income taxes | (11,403) |  | (3,730) |  | (26,738) |  | (9,025) |  |
Total assets | 662,103 |  | 601,676 |  | 662,103 |  | 601,676 |  |
Wireless Test |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 49,185 | [1] | 41,236 | [1] | 92,670 | [2] | 70,277 | [2] |
Income (loss) before income taxes | 14,482 |  | 10,930 |  | 24,702 |  | 14,558 |  |
Total assets | 108,066 |  | 93,232 |  | 108,066 |  | 93,232 |  |
Corporate And Others [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues | (253) |  | (89) |  | (253) |  | (240) |  |
Income (loss) before income taxes | (33,768) |  | 9,087 |  | (33,808) |  | 6,344 |  |
Total assets | $ 1,160,501 |  | $ 1,108,073 |  | $ 1,160,501 |  | $ 1,108,073 |  |
[1] | Includes $2.5 million and $1.7 million in 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”
[2] | Includes $4.3 million and $3.4 million in 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside ASC 606 “Revenue from Contracts with Customers.”

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