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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period $ 70,543 $ 45,102
Foreign currency impact (610)  
Payments [1] (34,590) (24,553)
Fair value adjustment [2] 2,970 (4,968)
Balance at end of period $ 38,313 $ 15,581
[1] In the three months ended March 31, 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 A/S (“Universal Robots”), respectively. 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.
[2] In the three months ended March 31, 2019, the fair value of contingent consideration for the earn-out in connection with the acquisition of MiR was increased by $3.0 million. 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.