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Schedule of Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | [1],[2] | Sep. 27, 2020 | [2],[3] | Jun. 28, 2020 | [2],[4] | Mar. 29, 2020 | [5] | Dec. 31, 2019 | [6],[7],[8] | Sep. 30, 2019 | [9] | Jun. 30, 2019 | [10] | Mar. 31, 2019 | [11] | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  |  |  |  |  |  |  | $ 312,153 | $ 192,442 | $ 189,691
Non-U.S. |  |  |  |  |  |  |  |  | 588,862 | 333,330 | 278,110
Income before income taxes | $ 222,925 | $ 263,731 | $ 217,291 | $ 197,069 | $ 148,886 | $ 151,733 | $ 131,177 | $ 93,979 | $ 901,015 | $ 525,772 | $ 467,801
[1] | Restructuring and other includes a $15.3 million gain for the decrease in the fair value adjustment to the AutoGuide acquisition contingent consideration liability, and a $0.9 million gain for the decrease in acquisition related compensation liability, partially offset by $1.1 million of employee severance charges primarily in Industrial Automation.
[2] | Teradyne recorded pension and post retirement net actuarial (gains) losses of $(0.1) million, $2.7 million, $7.7 million for the second, third and fourth quarter in 2020, respectively. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[3] | Restructuring and other includes a $27.2 million gain for the decrease in the fair value of AutoGuide contingent consideration liability, and a $1.1 million gain for the decrease in acquisition related compensation liability, partially offset by $0.5 million recorded for employee severance charges primarily in Industrial Automation.
[4] | Restructuring and other includes a $29.9 million charge for the increase in the fair value of the AutoGuide contingent consideration liability, a $4.0 million contract termination settlement charge, $3.1 million of acquisition related compensation and expense and $0.8 million of other expenses, partially offset by a $0.6 million gain for the decrease in the fair value of MiR contingent consideration liability.
[5] | Restructuring and other includes a $10.0 million gain for the decrease in the fair value of the AutoGuide and MiR contingent consideration liabilities, partially offset by $1.4 million of acquisition related compensation and expenses and $0.7 million of severance charges related to headcount reductions primarily in Industrial Automation and Semiconductor Test.
[6] | Other (income) expense, net includes a $15.0 million charge for the impairment of the investment in RealWear.
[7] | Restructuring and other includes a $5.8 million gain for the decrease in the fair value adjustment to the MiR acquisition contingent consideration, partially offset by a $3.0 million fair value adjustment to increase the AutoGuide acquisition contingent consideration, $0.5 million of employee severance charges and $0.2 million of acquisition related expenses and compensation.
[8] | Teradyne recorded pension and post retirement net actuarial losses of $7.7 million for the fourth quarter in 2019. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[9] | Restructuring and other includes a $7.8 million gain for the decrease in the fair value of MiR contingent consideration liability, partially offset by $0.8 million of employee severance charges and $0.5 million of acquisition related expenses and compensation.
[10] | Restructuring and other includes a $11.7 million gain for the decrease in the fair value of the MiR contingent consideration liability, partially offset by $0.8 million of employee severance charges and $0.5 million of acquisition related expenses and compensation.
[11] | Restructuring and other includes a $3.0 million fair value adjustment to increase the MiR acquisition contingent consideration, $1.3 million of acquisition related expenses and compensation and $0.8 million of employee severance charges.

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