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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance at beginning of period |  | $ 37,436 |  | $ 3,350 |
Ending Balance |  | 38,332 |  | 37,436 |
Payments | [1] | (15,000) |  |  |
Universal Robots |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Acquisition |  |  |  | 31,597 |
Fair value adjustment |  | 15,346 | [2] | 5,339 | [3]
Avionics Interface Technologies, LLC |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Fair value adjustment |  | $ 550 | [2] | (1,250) | [4]
ZTEC Instruments, Inc. |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Fair value adjustment | [5] |  |  | $ (1,600) |
[1] | During the year ended December 31, 2016, based on Universal Robots' calendar year 2015 EBITDA results, Teradyne paid $15 million or 100% of the eligible EBITDA contingent consideration amount.
[2] | During the year ended December 31, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $15.3 million primarily due to an increase in forecasted revenues and a decrease in the discount rate. During the year ended 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of AIT was increased by $0.6 million due to an increase in forecasted revenues. The AIT contingent consideration in the amount of $1.1 million was paid in January 2017.
[3] | During the year ended December 31, 2015, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $5.3 million primarily due to an increase in forecasted revenues.
[4] | During the year ended December 31, 2015, the fair value of contingent consideration for the earn-out in connection with the acquisition of AIT was reduced by $1.3 million due to a decrease in the forecasted revenues.
[5] | During the year ended December 31, 2015, the fair value measurement of the contingent consideration for the earn-out in connection with the acquisition of ZTEC Instruments, Inc. ("ZTEC") was reduced by $1.6 million, to $0, because Teradyne and the Securityholder Representative, on behalf of the ZTEC securityholders, agreed to terminate the earn-out prior to the end of the December 31, 2015 earn-out period, with no payout in connection with the resolution of indemnity claims asserted by both Teradyne and the Securityholder Representative.

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