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Reclassification Out of Accumulated Other Comprehensive Income to Statements of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | [1],[2] | Oct. 02, 2016 | [2],[3] | Jul. 03, 2016 | [2],[4] | Apr. 03, 2016 | [2],[5] | Dec. 31, 2015 | [6],[7] | Oct. 04, 2015 | [8] | Jul. 05, 2015 | [9] | Apr. 05, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ (3,095) | $ (2,892) | $ (1,666) | $ (1,642) | $ (2,017) | $ (1,708) | $ (1,674) | $ (1,816) | $ (9,296) | $ (7,214) | $ (6,259)
Reclassifications, net of tax |  |  |  |  |  |  |  |  | 945 | 999 |
Unrealized Gains (Losses) on Marketable Securities |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reclassifications, net of tax |  |  |  |  |  |  |  |  | 683 | 704 |
Amortization of prior service credit |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reclassifications, net of tax |  |  |  |  |  |  |  |  | 321 | 295 | 295
Prior service cost arising during period |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reclassifications, net of tax |  |  |  |  |  |  |  |  | (59) |  |
Retirement Plans Prior Service Credit |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reclassifications, net of tax |  |  |  |  |  |  |  |  | 262 | 295 | 295
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reclassifications, net of tax |  |  |  |  |  |  |  |  | 945 | 999 | 1,728
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Marketable Securities |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | $ 683 | $ 704 | $ 1,433
[1] | Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[2] | 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.
[3] | Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[4] | 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 $1.4 million for the increase in the fair value of contingent consideration liability of which $0.8 million related to Universal Robots, and $0.6 million related to AIT, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
[5] | Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[6] | 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 Teradyne's accounting policy.
[7] | 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.
[8] | Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[9] | Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.

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