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Schedule of Revenues by Country (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | [1],[2] | Oct. 04, 2015 | [3] | Jul. 05, 2015 | [4] | Apr. 05, 2015 | Dec. 31, 2014 | [5],[6],[7] | Sep. 28, 2014 | [5],[8] | Jun. 29, 2014 | [5] | Mar. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers |  | $ 318,444 | $ 465,994 | $ 512,739 | $ 342,401 | $ 323,236 | $ 478,010 | $ 525,567 | $ 321,010 | $ 1,639,578 | [9] | $ 1,647,824 | [9] | $ 1,427,933 | [9]
TAIWAN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers | [9] |  |  |  |  |  |  |  |  | 436,389 |  | 495,942 |  | 265,472 |
CHINA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers | [9] |  |  |  |  |  |  |  |  | 264,898 |  | 292,145 |  | 323,564 |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers | [9] |  |  |  |  |  |  |  |  | 217,386 |  | 213,104 |  | 230,178 |
JAPAN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers | [9] |  |  |  |  |  |  |  |  | 128,228 |  | 63,761 |  | 81,806 |
KOREA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers | [9] |  |  |  |  |  |  |  |  | 120,224 |  | 145,608 |  | 119,286 |
Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers | [9] |  |  |  |  |  |  |  |  | 111,903 |  | 111,043 |  | 90,797 |
SINGAPORE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers | [9] |  |  |  |  |  |  |  |  | 105,216 |  | 119,421 |  | 114,765 |
PHILIPPINES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers | [9] |  |  |  |  |  |  |  |  | 96,103 |  | 68,662 |  | 63,392 |
MALAYSIA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers | [9] |  |  |  |  |  |  |  |  | 76,707 |  | 83,910 |  | 86,900 |
THAILAND |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers | [9] |  |  |  |  |  |  |  |  | 59,104 |  | 44,117 |  | 32,209 |
Rest Of The World |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers | [9] |  |  |  |  |  |  |  |  | $ 23,420 |  | $ 10,111 |  | $ 19,564 |
[1] | In the fourth quarter ended December 31, 2015, Teradyne recorded pension and post retirement net actuarial losses of $17.7 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[2] | Restructuring and other includes a $5.3 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and a $(0.3) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[3] | Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[4] | Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[5] | Dividends declared by Teradyne's Board of Directors were paid in the second, third and fourth quarters of 2014.
[6] | In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[7] | In the fourth quarter ended December 31, 2014, Teradyne recorded pension and post retirement net actuarial losses of $46.6 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[8] | Restructuring and other includes a $(0.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[9] | Revenues attributable to a country are based on location of customer site.

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