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Summarize Impact of ASC 606 to Condensed Consolidated Statement of Operation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
 [2],[3]
Sep. 30, 2018
 [3],[4]
Jul. 01, 2018
 [3],[5]
Apr. 01, 2018
 [6]
Dec. 31, 2017
 [7],[8]
Oct. 01, 2017
 [8],[9]
Jul. 02, 2017
 [8],[10]
Apr. 02, 2017
 [11]
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues [1]                 $ 2,100,802 $ 2,136,606 $ 1,753,250
Total cost of revenues                 880,408    
Income tax provision $ (32,662) $ 20,863 $ 18,975 $ 8,846 $ 204,007 $ 24,017 $ 31,901 $ 6,795 16,022 266,720 (11,639)
Net income $ 143,790 $ 119,978 $ 101,037 $ 86,974 $ (105,923) $ 103,420 $ 174,976 $ 85,221 $ 451,779 $ 257,692 $ (43,421)
Net income per common share:                      
Basic $ 0.80 $ 0.65 $ 0.53 $ 0.45 $ (0.54) $ 0.52 $ 0.88 $ 0.43 $ 2.41 $ 1.30 $ (0.21)
Diluted $ 0.79 $ 0.63 $ 0.52 $ 0.43 $ (0.54) $ 0.52 $ 0.87 $ 0.42 $ 2.35 $ 1.28 $ (0.21)
ASU 2014-09                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues                 $ 2,088,800    
ASU 2014-09 | Adjustments to Recognize Under Legacy GAAP                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues                 (39,184)    
Total cost of revenues                 (10,760)    
Income tax provision                 (4,197)    
Net income                 $ (24,227)    
Net income per common share:                      
Basic                 $ (0.13)    
Diluted                 $ (0.13)    
ASU 2014-09 | Legacy GAAP                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues                 $ 2,061,618    
Total cost of revenues                 869,648    
Income tax provision                 11,825    
Net income                 $ 427,552    
Net income per common share:                      
Basic                 $ 2.28    
Diluted                 $ 2.22    
[1] Revenues attributable to a country are based on location of customer site.
[2] 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.
[3] 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.
[4] 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.
[5] 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.
[6] 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.
[7] 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.
[8] 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.
[9] 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.
[10] 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.
[11] 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.