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Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2014 | Dec. 31, 2015 | Oct. 04, 2015 | Jul. 05, 2015 | Dec. 31, 2014 | Sep. 28, 2014 | Jun. 29, 2014 | [5] | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  | $ 5,204 | [1],[2] | $ 261 | [3] | $ (385) | [4] | $ 1,198 | [5],[6],[7] | $ (405) | [5],[8] | $ 572 | $ 5,080 | $ 1,365 | $ 2,080
Goodwill impairment charge |  |  |  |  |  |  |  |  | 98,897 | [5],[6],[7] |  |  |  |  | 98,897 | 0
Contingent consideration adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,489 | (630) |
Gain from the sale of an equity investment |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,406 |  | 34,212
Stock based compensation expense |  | $ 6,600 |  |  |  |  |  |  |  |  |  |  |  | 30,451 | 40,307 | 36,612
Selling and Administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,024 | 26,486 | 19,822
Universal Robots |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  | 5,339 |  |  |  |  |  |  |  |  |  |  | 5,339 |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,104 |  |
ZTEC Instruments, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  |  |  |  |  | $ (1,600) |  |  |  | $ (630) |  |  | (1,600) | (630) |
Avionics Interface Technologies, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  | $ (300) |  | $ (1,000) |  |  |  |  |  |  |  |  | (1,250) |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 372 |
System Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,324 | 2,125 | 4,168
Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,037 | 742 | 1,431
Goodwill impairment charge |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
Semiconductor Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,508 | 14,389 | 5,218
Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  | 499 | 490 | 1,016
Wireless Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500 | 5,679 | 7,206
Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 565 | 82
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98,897 |
Industrial Automation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues-inventory step-up | [9] |  |  |  |  |  |  |  |  |  |  |  |  | 1,567 |  |
Corporate And Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 198 | (449)
Corporate And Eliminations | Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,104 | 372 |
Corporate And Eliminations | Other (income) expense, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from the sale of an equity investment |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,406) |  | $ (34,212)
Corporate And Eliminations | Selling and Administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | [10] |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,598 |
Corporate And Eliminations | Universal Robots | Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,339 |  |
Corporate And Eliminations | ZTEC Instruments, Inc. | Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,600) | $ (630) |
Corporate And Eliminations | Avionics Interface Technologies, LLC | Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,250) |  |
[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] | Included in the cost of revenues for the years ended December 31, 2015 is the cost for purchase accounting inventory step-up.
[10] | Expense related to the January 2014 retirement of Teradyne's former chief executive officer; see Note N: "Stock-Based Compensation."

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