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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance at beginning of period $ 39,415 $ 24,914 $ 38,332 $ 37,436
Payments [1]     (1,050) (15,000)
Fair value adjustment [2],[3] (286) 7,973 1,847 10,451
Ending Balance $ 39,129 $ 32,887 $ 39,129 $ 32,887
[1] In the nine months ended October 1, 2017, Teradyne paid $1.1 million of contingent consideration for the earn-out in connection with the acquisition of Avionics Interface Technology, LLC ("AIT"). In the nine months ended October 2, 2016, based on Universal Robots' calendar year 2015 EBITA results, Teradyne paid $15.0 million or 100% of the eligible EBITA contingent consideration amount in connection with the acquisition of Universal Robots.
[2] In the nine months ended October 1, 2017, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $1.8 million due to an increase in forecasted revenue. In the three and nine months ended October 2, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $8.0 million and $9.9 million, respectively, primarily due to an increase in forecasted revenue and a decrease in the discount rate.
[3] In the nine months ended October 2, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of AIT was increased by $0.6 million due to an increase in forecasted revenue.