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Schedule of Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | [1],[2] | Oct. 01, 2017 | [3] | Jul. 02, 2017 | [2],[4] | Apr. 02, 2017 | [5] | Dec. 31, 2016 | [6],[7] | Oct. 02, 2016 | [7],[8] | Jul. 03, 2016 | [7],[9] | Apr. 03, 2016 | [7],[10] | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  |  |  |  |  |  |  | $ 76,699 | $ (341,018) | $ 56,270
Non-U.S. |  |  |  |  |  |  |  |  | 447,713 | 285,958 | 196,854
Income (loss) before income taxes | $ 98,084 | $ 127,437 | $ 206,877 | $ 92,016 | $ 58,884 | $ 59,681 | $ (230,817) | $ 57,192 | $ 524,412 | $ (55,060) | $ 253,124
[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.

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