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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Oct. 04, 2015 | [3] | Jul. 05, 2015 | [4] | Apr. 05, 2015 | Dec. 31, 2014 | Sep. 28, 2014 | [5],[8] | Jun. 29, 2014 | [5] | Mar. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 318,444 | [1],[2] | $ 465,994 | $ 512,739 | $ 342,401 | $ 323,236 | [5],[6],[7] | $ 478,010 | $ 525,567 | $ 321,010 | $ 1,639,578 | [9] | $ 1,647,824 | [9] | $ 1,427,933 | [9]
Income (loss) before taxes |  | (8,857) | [1],[2] | $ 87,408 | $ 132,136 | $ 42,438 | (124,813) | [5],[6],[7] | $ 100,670 | $ 121,392 | $ (1,873) | 253,124 | [10],[11] | 95,376 | [10],[11] | 201,922 | [10],[11]
Total assets | [12] | 2,548,674 |  |  |  |  | 2,538,520 |  |  |  |  | 2,548,674 |  | 2,538,520 |  | 2,629,824 |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 89,878 |  | 168,982 |  | 106,731 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 140,772 |  | 152,544 |  | 150,687 |
Semiconductor Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 1,201,530 |  | 1,300,790 |  | 1,023,041 |
Income (loss) before taxes | [10],[11] |  |  |  |  |  |  |  |  |  |  | 260,154 |  | 255,803 |  | 153,797 |
Total assets | [12] | 610,869 |  |  |  |  | 580,501 |  |  |  |  | 610,869 |  | 580,501 |  | 632,840 |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 79,052 |  | 159,783 |  | 94,303 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 64,415 |  | 84,990 |  | 72,472 |
Wireless Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 184,572 |  | 184,535 |  | 251,871 |
Income (loss) before taxes | [10],[11] |  |  |  |  |  |  |  |  |  |  | (13,830) |  | (116,196) |  | 23,153 |
Total assets | [12] | 427,880 |  |  |  |  | 478,974 |  |  |  |  | 427,880 |  | 478,974 |  | 645,001 |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 3,133 |  | 3,730 |  | 5,358 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 53,440 |  | 53,308 |  | 51,675 |
System Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 211,584 |  | 162,499 |  | 153,021 |
Income (loss) before taxes | [10],[11] |  |  |  |  |  |  |  |  |  |  | 25,101 |  | 12,116 |  | 3,115 |
Total assets | [12] | 102,547 |  |  |  |  | 95,105 |  |  |  |  | 102,547 |  | 95,105 |  | 79,983 |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 6,228 |  | 5,469 |  | 7,070 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 4,390 |  | 5,399 |  | 5,180 |
Industrial Automation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 41,892 |  |  |  |  |
Income (loss) before taxes | [10],[11] |  |  |  |  |  |  |  |  |  |  | (7,574) |  |  |  |  |
Total assets | [12] | 344,260 |  |  |  |  |  |  |  |  |  | 344,260 |  |  |  |  |
Property additions |  |  |  |  |  |  |  |  |  |  |  | 1,465 |  |  |  |  |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 14,500 |  |  |  |  |
Corporate And Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before taxes | [10],[11] |  |  |  |  |  |  |  |  |  |  | (10,727) |  | (56,347) |  | 21,857 |
Total assets | [12] | $ 1,063,118 |  |  |  |  | $ 1,383,940 |  |  |  |  | 1,063,118 |  | 1,383,940 |  | 1,272,000 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | $ 4,027 |  | $ 8,847 |  | $ 21,360 |
[1] | 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 our accounting policy.
[2] | 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.
[3] | Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[4] | Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[5] | Dividends declared by Teradyne's Board of Directors were paid in the second, third and fourth quarters of 2014.
[6] | In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[7] | In the fourth quarter ended December 31, 2014, Teradyne recorded pension and post retirement net actuarial losses of $46.6 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[8] | Restructuring and other includes a $(0.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[9] | Revenues attributable to a country are based on location of customer site.
[10] | Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges and goodwill impairment charges.
[11] | 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.
[12] | 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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