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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. 03, 2016 | Apr. 05, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance at beginning of period |  | $ 37,436 | $ 3,350
Payments | [1] | (15,000) | 0
Fair value adjustment | [2] | 1,173 | 0
Ending Balance |  | $ 23,609 | $ 3,350
[1] | In the three months ended April 3, 2016, based on Universal Robots' calendar year 2015 EBITDA results, Teradyne paid $15 million or 100% of the eligible EBITDA contingent consideration amount.
[2] | In the three months ended April 3, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $1.2 million primarily due to a lower discount rate.

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