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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - Jul. 05, 2015 - USD ($) $ in Thousands | Total | Total
--- | --- | ---
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance at beginning of period |  | $ 3,350 | $ 3,350
Ending Balance |  | 35,595 | 35,595
Universal Robots |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Acquisition |  | 33,845 | 33,845
ZTEC Instruments, Inc. |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair value adjustment | [1] | $ (1,600) | $ (1,600)
[1] | The fair value measurement of the contingent consideration for the earn-out in connection with the acquisition of ZTEC Instruments, Inc. was reduced 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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