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Schedule of Revenues by Country (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
 [1],[2]
Oct. 01, 2017
 [3]
Jul. 02, 2017
 [2],[4]
Apr. 02, 2017
 [5]
Dec. 31, 2016
 [6],[7]
Oct. 02, 2016
 [7],[8]
Jul. 03, 2016
 [7],[9]
Apr. 03, 2016
 [7],[10]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers $ 479,415 $ 503,378 $ 696,901 $ 456,913 $ 379,989 $ 410,475 $ 531,792 $ 430,994 $ 2,136,606 [11] $ 1,753,250 [11] $ 1,639,578 [11]
TAIWAN                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [11]                 687,031 653,076 436,389
CHINA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [11]                 260,451 174,876 264,898
UNITED STATES                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [11]                 252,516 221,948 217,386
KOREA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [11]                 206,819 147,882 120,224
JAPAN                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [11]                 169,093 135,978 128,228
Europe                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [11]                 163,715 117,671 111,903
MALAYSIA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [11]                 124,048 103,472 76,707
PHILIPPINES                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [11]                 105,850 54,705 96,103
SINGAPORE                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [11]                 101,085 73,172 105,216
THAILAND                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [11]                 29,566 43,097 59,104
Rest Of The World                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [11]                 $ 36,432 $ 27,373 $ 23,420
[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] Revenues attributable to a country are based on location of customer site.