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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Oct. 01, 2017 | [3] | Jul. 02, 2017 | [2],[4] | Apr. 02, 2017 | [5] | Dec. 31, 2016 | Oct. 02, 2016 | [7],[8] | Jul. 03, 2016 | [7],[9] | Apr. 03, 2016 | [7],[10] | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 479,415 | [1],[2] | $ 503,378 | $ 696,901 | $ 456,913 | $ 379,989 | [6],[7] | $ 410,475 | $ 531,792 | $ 430,994 | $ 2,136,606 | [11] | $ 1,753,250 | [11] | $ 1,639,578 | [11]
Income (loss) before taxes | [12],[13] |  |  |  |  |  |  |  |  |  |  | 524,412 |  | (55,060) |  | 253,124 |
Total assets | [14] | 3,109,545 |  |  |  |  | 2,762,493 |  |  |  |  | 3,109,545 |  | 2,762,493 |  | 2,548,674 |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 105,375 |  | 85,272 |  | 89,878 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 108,075 |  | 120,009 |  | 140,773 |
Semiconductor Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 1,662,549 |  | 1,368,169 |  | 1,201,530 |
Income (loss) before taxes | [12],[13] |  |  |  |  |  |  |  |  |  |  | 491,361 |  | 311,939 |  | 260,154 |
Total assets | [14] | 597,480 |  |  |  |  | 557,546 |  |  |  |  | 597,480 |  | 557,546 |  | 610,869 |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 87,920 |  | 70,543 |  | 79,052 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 58,901 |  | 58,087 |  | 64,415 |
System Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 192,135 |  | 189,846 |  | 211,584 |
Income (loss) before taxes | [12],[13] |  |  |  |  |  |  |  |  |  |  | 10,306 |  | 28,916 |  | 25,101 |
Total assets | [14] | 97,018 |  |  |  |  | 110,361 |  |  |  |  | 97,018 |  | 110,361 |  | 102,547 |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 5,976 |  | 3,788 |  | 6,228 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 6,646 |  | 6,551 |  | 4,391 |
Industrial Automation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 170,056 |  | 99,031 |  | 41,892 |
Income (loss) before taxes | [12],[13] |  |  |  |  |  |  |  |  |  |  | 8,763 |  | (16,783) |  | (7,574) |
Total assets | [14] | 368,037 |  |  |  |  | 317,635 |  |  |  |  | 368,037 |  | 317,635 |  | 344,260 |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 7,044 |  | 6,755 |  | 1,465 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 25,711 |  | 26,869 |  | 14,500 |
Wireless Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 111,866 |  | 96,204 |  | 184,572 |
Income (loss) before taxes | [12],[13] |  |  |  |  |  |  |  |  |  |  | 17,350 |  | (371,409) |  | (13,830) |
Total assets | [14] | 59,912 |  |  |  |  | 62,366 |  |  |  |  | 59,912 |  | 62,366 |  | 427,880 |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 4,435 |  | 4,186 |  | 3,133 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 5,392 |  | 25,921 |  | 53,440 |
Corporate And Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before taxes | [12],[13] |  |  |  |  |  |  |  |  |  |  | (3,368) |  | (7,723) |  | (10,727) |
Total assets | [14] | $ 1,987,098 |  |  |  |  | $ 1,714,585 |  |  |  |  | 1,987,098 |  | 1,714,585 |  | 1,063,118 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | $ 11,425 |  | $ 2,581 |  | $ 4,027 |
[1] | Restructuring and other includes a $6.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, $1.8 million of employee severance charges, and $1.1 million of charges for impairment of fixed assets.
[2] | Teradyne recorded pension and post retirement net actuarial gains of $2.5 million and $3.8 million for the second and fourth quarter in 2017, respectively. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[3] | Restructuring and other includes $5.1 million of property insurance recovery related to the Japan earthquake, a $0.4 million credit related to previously impaired lease termination of a Wireless Test facility in Sunnyvale, CA, and a $0.3 million credit for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $0.8 million of Japan earthquake related expenses and $0.6 million of employee severance charges.
[4] | Restructuring and other includes a $1.5 million charge for a fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.8 million of employee severance charges.
[5] | Restructuring and other includes a $1.3 million charge for a lease impairment of a Wireless Test facility in Sunnyvale, CA, a $0.6 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.6 million of employee severance charges.
[6] | Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[7] | Teradyne recorded pension and post retirement net actuarial (gains) losses of $(1.2) million, $(0.7) million, $0.7 million and $(2.0) million for the first, second, third, and fourth quarter in 2016, respectively. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[8] | Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[9] | Restructuring and other includes $4.2 million for an impairment of fixed assets, $0.9 million for expenses related to an earthquake in Kumamoto, Japan, and a $1.4 million fair value adjustment to increase contingent consideration liability, of which $0.8 million was related to Universal Robots and $0.6 million was related to AIT, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
[10] | Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[11] | Revenues attributable to a country are based on location of customer site.
[12] | Included in Corporate and Eliminations are: contingent consideration adjustments, pension and postretirement plans actuarial gains (losses), severance charges, impairment of fixed assets and expenses related to the Japan earthquake, property insurance recovery, interest income, interest expense, net foreign exchange gains (losses), and gain from the sale of an equity investment.
[13] | Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges, goodwill impairment charges and an acquired intangible assets impairment charge.
[14] | 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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