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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance at beginning of period |  | $ 15,581 | $ 37,916 | $ 45,102 | $ 38,332
Acquisition of MiR |  | 51,399 |  | 51,399 |
Foreign currency impact |  | (2,566) |  | (2,566) |
Payments | [1] |  |  | (24,553) | (1,050)
Fair value adjustment | [2] | (3,500) | 1,499 | (8,468) | 2,133
Balance at end of period |  | $ 60,914 | $ 39,415 | $ 60,914 | $ 39,415
[1] | In the six months ended July 1, 2018, Teradyne paid $24.6 million of contingent consideration for the earn-out in connection with the acquisition of Universal Robots A/S ("Universal Robots"). In the six months ended July 2, 2017, Teradyne paid $1.1 million of contingent consideration for the earn-out in connection with the acquisition of Avionics Interface Technology, LLC ("AIT").
[2] | In the three and six months ended July 1, 2018, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was decreased by $3.5 million and $8.5 million, respectively, primarily due to a decrease in forecasted revenue. In the three and six months ended July 2, 2017, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $1.5 million and $2.1 million, respectively, primarily due to a decrease in the discount rate.

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