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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.

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