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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 01, 2018 | Apr. 02, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance at beginning of period |  | $ 45,102 | $ 38,332
Payments | [1] | (24,553) | (1,050)
Fair value adjustment | [2] | (4,968) | 634
Balance at end of period |  | $ 15,581 | $ 37,916
[1] | In the three months ended April 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 three months ended April 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 months ended April 1, 2018, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was decreased by $5.0 million, primarily due to a decrease in forecasted revenue. In the three months ended April 2, 2017, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $0.6 million primarily due to an increase in forecasted revenue and a decrease in the discount rate.

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