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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance at beginning of period |  | $ 70,543 | $ 45,102
Acquisition of MiR |  | 23,976 | 52,547
Foreign currency impact |  | (967) | (3,540)
Payments | [1] | (34,590) | (24,553)
Fair value adjustment | [2] | (19,257) | 987
Balance at end of period |  | $ 39,705 | $ 70,543
[1] | During the year ended December 31, 2018, Teradyne paid $24.6 million of contingent consideration for the earn-out in connection with the acquisition of Universal Robots.
[2] | During the year ended December 31, 2018, the fair value of contingent consideration for the earn-out in connection with the acquisition of MiR was increased by $17.7 million primarily due to an increase in forecasted revenues. During the year ended December 31, 2018, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was decreased by $16.7 million primarily due to a decrease in forecasted revenues.

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