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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
--- | --- | ---
Sep. 29, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance at beginning of period |  | $ 26,847 | $ 60,914 | $ 70,543 | $ 45,102
Acquisition of MiR | [1] | (7,759) | (768) | (16,460) | (9,236)
Foreign currency impact |  | (1,008) | 796 | (1,413) | (1,770)
Payments | [2] |  |  | (34,590) | (24,553)
Fair value adjustment |  |  |  |  | 51,399
Balance at end of period |  | $ 18,080 | $ 60,942 | $ 18,080 | $ 60,942
[1] | In the three and nine months ended September 29, 2019, the fair value of contingent consideration for the earn-out in connection with the acquisition of MiR was decreased by $7.8 million and $16.5 million, respectively, primarily due to a decrease in the forecasted revenue, partially offset by impact from the modification, in the three months ended September 29, 2019, of the earn-out structure. In the three and nine months ended September 30, 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 $0.8 million and $9.2 million, respectively, primarily due to a decrease in forecasted revenue.
[2] | In the nine months ended September 29, 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 nine months ended September 30, 2018, Teradyne paid $24.6 million of contingent consideration for the earn-out in connection with the acquisition of Universal Robots.

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