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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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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.

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