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Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Oct. 01, 2017
Jul. 02, 2017
Apr. 02, 2017
Dec. 31, 2016
Oct. 02, 2016
Jul. 03, 2016
Apr. 03, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Restructuring and other-employee severance $ 8,970 [1],[2] $ (4,407) [3] $ 2,288 [2],[4] $ 2,511 [5] $ 5,570 [6],[7] $ 12,177 [7],[8] $ 2,608 [7],[9] $ 1,587 [7],[10] $ 9,362 $ 21,942 $ 5,080
Goodwill impairment charge         0   254,946 [7],[9]   0 254,946  
Intangible assets impairment charge             83,339 [7],[9]     83,339  
Pension acturial (gains) losses 3,800   2,500   2,000 (700) 700 1,200      
Contingent consideration adjustment                 7,820 15,896 2,489
Other (income) expense, net-gain from the sale of an equity investment                     5,406
Restructuring and other                      
Segment Reporting Information [Line Items]                      
Building impairment and other expenses             4,200        
Contingent consideration adjustment             1,400        
Universal Robots                      
Segment Reporting Information [Line Items]                      
Contingent consideration adjustment $ 6,000 $ (300) $ 1,500 $ 600 $ 5,400 $ 8,000   $ 1,200 7,800 15,300 5,300
Acquisition related costs                     1,000
Universal Robots | Restructuring and other                      
Segment Reporting Information [Line Items]                      
Contingent consideration adjustment             800        
ZTEC Instruments, Inc.                      
Segment Reporting Information [Line Items]                      
Contingent consideration adjustment                     (1,600)
Avionics Interface Technologies, LLC                      
Segment Reporting Information [Line Items]                      
Contingent consideration adjustment                   600 (1,300)
Avionics Interface Technologies, LLC | Restructuring and other                      
Segment Reporting Information [Line Items]                      
Contingent consideration adjustment             600        
Semiconductor Test                      
Segment Reporting Information [Line Items]                      
Cost of revenues-inventory charge                 4,606 9,656 10,508
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                 1,779 2,860 499
System Test                      
Segment Reporting Information [Line Items]                      
Cost of revenues-inventory charge                 1,918 630 8,324
Restructuring and other-employee severance                   (49) 1,037
Industrial Automation                      
Segment Reporting Information [Line Items]                      
Restructuring and other-employee severance                 1,414 585  
Cost of revenues-inventory step-up [11]                     1,567
Wireless Test                      
Segment Reporting Information [Line Items]                      
Cost of revenues-inventory charge                 2,190 7,207 2,500
Restructuring and other-lease impairment                 973    
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]                      
Restructuring and other-employee severance                 530    
Property insurance recovery                 (5,064) (5,051)  
Acquisition related costs                     1,104
Corporate And Eliminations | Cost of revenues                      
Segment Reporting Information [Line Items]                      
Pension acturial (gains) losses                 (2,752) (1,025) 8,271
Corporate And Eliminations | Engineering and development                      
Segment Reporting Information [Line Items]                      
Pension acturial (gains) losses                 (2,456) (1,234) 4,658
Corporate And Eliminations | Selling and administrative                      
Segment Reporting Information [Line Items]                      
Pension acturial (gains) losses                 (1,416) (944) 4,826
Corporate And Eliminations | Other (income) expense, net                      
Segment Reporting Information [Line Items]                      
Other (income) expense, net-gain from the sale of an equity investment                     (5,406)
Corporate And Eliminations | Universal Robots | Restructuring and other                      
Segment Reporting Information [Line Items]                      
Contingent consideration adjustment                 7,820 15,346 5,339
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 | ZTEC Instruments, Inc. | Restructuring and other                      
Segment Reporting Information [Line Items]                      
Contingent consideration adjustment                     (1,600)
Corporate And Eliminations | Avionics Interface Technologies, LLC | Restructuring and other                      
Segment Reporting Information [Line Items]                      
Contingent consideration adjustment                   $ 550 $ (1,250)
[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.
[11] Included in the cost of revenues for the year ended December 31, 2015 is the cost for purchase accounting inventory step-up.