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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Oct. 02, 2016 | [2],[3] | Jul. 03, 2016 | [2],[4] | Apr. 03, 2016 | [2],[5] | Dec. 31, 2015 | Oct. 04, 2015 | [8] | Jul. 05, 2015 | [9] | Apr. 05, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 379,989 | [1],[2] | $ 410,475 | $ 531,792 | $ 430,994 | $ 318,444 | [6],[7] | $ 465,994 | $ 512,739 | $ 342,401 | $ 1,753,250 | [10] | $ 1,639,578 | [10] | $ 1,647,824 | [10]
Income (loss) before taxes |  | 58,884 | [1],[2] | $ 59,681 | $ (230,817) | $ 57,192 | (8,857) | [6],[7] | $ 87,408 | $ 132,136 | $ 42,438 | (55,060) | [11],[12] | 253,124 | [11],[12] | 95,376 | [11],[12]
Total assets | [13] | 2,762,493 |  |  |  |  | 2,548,674 |  |  |  |  | 2,762,493 |  | 2,548,674 |  | 2,538,520 |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 85,272 |  | 89,878 |  | 168,982 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 120,009 |  | 140,773 |  | 152,544 |
Semiconductor Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 1,368,169 |  | 1,201,530 |  | 1,300,790 |
Income (loss) before taxes | [11],[12] |  |  |  |  |  |  |  |  |  |  | 311,939 |  | 260,154 |  | 255,803 |
Total assets | [13] | 557,546 |  |  |  |  | 610,869 |  |  |  |  | 557,546 |  | 610,869 |  | 580,501 |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 70,543 |  | 79,052 |  | 159,783 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 58,087 |  | 64,415 |  | 84,990 |
Wireless Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 96,204 |  | 184,572 |  | 184,535 |
Income (loss) before taxes | [11],[12] |  |  |  |  |  |  |  |  |  |  | (371,409) |  | (13,830) |  | (116,196) |
Total assets | [13] | 62,366 |  |  |  |  | 427,880 |  |  |  |  | 62,366 |  | 427,880 |  | 478,974 |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 4,186 |  | 3,133 |  | 3,730 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 25,921 |  | 53,440 |  | 53,308 |
System Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 189,846 |  | 211,584 |  | 162,499 |
Income (loss) before taxes | [11],[12] |  |  |  |  |  |  |  |  |  |  | 28,916 |  | 25,101 |  | 12,116 |
Total assets | [13] | 110,361 |  |  |  |  | 102,547 |  |  |  |  | 110,361 |  | 102,547 |  | 95,105 |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 3,788 |  | 6,228 |  | 5,469 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 6,551 |  | 4,391 |  | 5,399 |
Industrial Automation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 99,031 |  | 41,892 |  |  |
Income (loss) before taxes | [11],[12] |  |  |  |  |  |  |  |  |  |  | (16,783) |  | (7,574) |  |  |
Total assets | [13] | 317,635 |  |  |  |  | 344,260 |  |  |  |  | 317,635 |  | 344,260 |  |  |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 6,755 |  | 1,465 |  |  |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 26,869 |  | 14,500 |  |  |
Corporate And Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before taxes | [11],[12] |  |  |  |  |  |  |  |  |  |  | (7,723) |  | (10,727) |  | (56,347) |
Total assets | [13] | $ 1,714,585 |  |  |  |  | $ 1,063,118 |  |  |  |  | 1,714,585 |  | 1,063,118 |  | 1,383,940 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | $ 2,581 |  | $ 4,027 |  | $ 8,847 |
[1] | Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[2] | 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.
[3] | Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[4] | 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 $1.4 million for the increase in the fair value of contingent consideration liability of which $0.8 million related to Universal Robots, and $0.6 million related to AIT, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
[5] | Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[6] | In the fourth quarter ended December 31, 2015, Teradyne recorded pension and post retirement net actuarial losses of $17.7 million. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[7] | Restructuring and other includes a $5.3 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and a $(0.3) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[8] | Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[9] | Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[10] | Revenues attributable to a country are based on location of customer site.
[11] | Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges, goodwill impairment charges and acquired intangible assets impairment charge.
[12] | Interest income, interest expense, other (income) expense, net, contingent consideration adjustments and pension and postretirement plans actuarial gains and losses are included in Corporate and Eliminations.
[13] | 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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