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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. 02, 2017 | Apr. 03, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance at beginning of period |  | $ 38,332 | $ 37,436
Payments | [1] | (1,050) | (15,000)
Fair value adjustment | [2] | 634 | 1,173
Ending Balance |  | $ 37,916 | $ 23,609
[1] | In the three months ended April 2, 2017, Teradyne paid $1.1 million of the AIT contingent consideration. In the three months ended April 3, 2016 based on Universal Robots' calendar year 2015 EBITDA results, Teradyne paid $15.0 million or 100% of the eligible EBITDA contingent consideration amount.
[2] | In the three months ended April 2, 2017 and April 3, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $0.6 million and $1.2 million, respectively, primarily due to a decrease in the discount rate.

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