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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.