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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
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance at beginning of period $ 38,313 $ 15,581 $ 70,543 $ 45,102
Acquisition of MiR [1] (11,672) (3,500) (8,701) (8,468)
Foreign currency impact 206 (2,566) (405) (2,566)
Payments [2]     (34,590) (24,553)
Fair value adjustment [1]   51,399   51,399
Balance at end of period $ 26,847 $ 60,914 $ 26,847 $ 60,914
[1] In the three and six months ended June 30, 2019, the fair value of contingent consideration for the earn-out in connection with the acquisition of MiR was decreased by $11.7 million and $8.7 million, respectively, primarily due to a decrease in the forecasted revenue. 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 A/S (“Universal Robots”) was decreased by $3.5 million and $8.5 million, respectively, primarily due to a decrease in forecasted revenue.
[2] In the six months ended June 30, 2019, Teradyne paid $30.8 million and $3.8 million of contingent consideration for the earn-outs in connection with the acquisition of MiR and Universal Robots, respectively. 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.