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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.