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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
 [2],[3]
Jul. 01, 2018
 [2],[4]
Apr. 01, 2018
 [5]
Dec. 31, 2017
Oct. 01, 2017
 [7],[8]
Jul. 02, 2017
 [7],[9]
Apr. 02, 2017
 [10]
Jul. 03, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Line Items]                        
Goodwill $ 381,850       $ 252,011         $ 381,850 $ 252,011 $ 223,343
Goodwill impairment                     254,946
Acquired intangible assets impairment                   8,800   83,339
Intangible assets remaining balance 125,482       79,088         125,482 79,088  
Acquired intangible assets amortization 10,558 [1],[2] $ 11,142 $ 9,793 $ 7,698 7,384 [6],[7] $ 7,028 $ 8,166 $ 7,952   39,191 30,530 52,648
Wireless Test                        
Goodwill and Intangible Assets Disclosure [Line Items]                        
Employee reduction, percentage                 11.00%      
Goodwill 7,976       $ 7,976       $ 8,000 7,976 $ 7,976 7,976
Goodwill impairment                 254,900     254,946
Acquired intangible assets impairment                 $ 83,300     $ 83,339
Intangible assets remaining balance $ 2,200                 $ 2,200    
Wireless Test | Sales Revenue, Segment | Customer Concentration Risk | Minimum                        
Goodwill and Intangible Assets Disclosure [Line Items]                        
Concentration risk, percentage                 51.00%      
Wireless Test | Sales Revenue, Segment | Customer Concentration Risk | Maximum                        
Goodwill and Intangible Assets Disclosure [Line Items]                        
Concentration risk, percentage                 73.00%      
[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.