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Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Jul. 03, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs | $ 500 |  | $ 800 |  | $ 2,500 |  | $ 800 |  |  |  |  |  |  |  |  |  |  | $ 4,500 |  |
Restructuring and other-employee severance | 11,446 | [1],[2] | 1,710 | [2],[3] | 2,389 | [2],[4] | (313) | [5] | $ 8,970 | [6],[7] | $ (4,407) | [7],[8] | $ 2,288 | [7],[9] | $ 2,511 | [10] |  | 15,232 | $ 9,362 | $ 21,942
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 254,946
Intangible assets impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,800 |  | 83,339
Contingent consideration adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 987 | 7,820 | 15,896
Universal Robots (UR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment | 7,400 |  | $ 800 |  | $ 3,500 |  | $ 5,000 |  | $ 6,000 |  | $ (300) |  | $ 1,500 |  | $ 600 |  |  | (16,700) | 7,800 | 15,300
Mobile Industrial Robots (MiR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment | $ 17,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,700 |  |
Semiconductor Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,822 | 4,606 | 9,656
Semiconductor Test | Fixed Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other-employee severance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,124 |
Semiconductor Test | Severance And Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other-employee severance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,429 | 1,779 | 2,860
System Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,175 | 1,918 | 630
Industrial Automation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,163 |  |
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 680 |  |
Restructuring and other-employee severance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,414 | 585
Wireless Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,565 | 2,190 | 7,207
Restructuring and other-lease impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 972 |
Restructuring and other-employee severance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,650
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 254,900 |  |  | 254,946
Intangible assets impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 83,300 |  |  | 83,339
Corporate And Eliminations | Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,422 |  |
Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 872 |  |
Property insurance recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,064) | (5,051)
Corporate And Eliminations | Universal Robots (UR) | Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,679) | 7,820 | 15,346
Corporate And Eliminations | Impairment of Fixed Assets and Expenses Related to the Japan Earthquake | Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Building impairment and other expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 755 | $ 5,051
Corporate And Eliminations | Mobile Industrial Robots (MiR) | Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,666 |  |
[1] | Restructuring and other includes a $17.7 million fair value adjustment to increase the MiR acquisition contingent consideration, $0.8 million of employee severance charges, and $0.5 million acquisition related expenses and compensation, partially offset by a $7.4 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability.
[2] | Teradyne recorded pension and post retirement net actuarial (gains) losses of $(0.1) million, $0.3 million and $(3.5) million for the second, third and fourth quarter in 2018, respectively. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[3] | Restructuring and other includes $1.7 million of employee severance charges, $0.8 million of acquisition related expenses and compensation, partially offset by a $0.8 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability.
[4] | Restructuring and other includes a $5.0 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $3.9 million of employee severance charges and $0.8 million of acquisition related expenses and compensation.
[5] | Restructuring and other includes a $3.5 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $2.5 million of acquisition related expenses and compensation and $2.4 million of employee severance charges.
[6] | 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.
[7] | Teradyne recorded pension and post retirement net actuarial gains of $2.8 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.
[8] | 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.
[9] | 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.
[10] | 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.

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