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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - USD ($)
$ in Thousands
 12 Months Ended
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.