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Quantitative Information Associated With Fair Value Measurement of Level 3 Financial Instrument (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2014 | Dec. 31, 2016 | Jun. 11, 2015
Universal Robots |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Contingent consideration |  |  |  | $ 31,600
Avionics Interface Technologies, LLC |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Contingent consideration |  | $ 1,800 |  |
Discount rate |  | 4.70% |  |
Significant Unobservable Inputs (Level 3) | Avionics Interface Technologies, LLC |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Contingent consideration | [1] |  | $ 1,050 |
Monte Carlo simulation model | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Contingent consideration |  |  | 15,981 |
Monte Carlo simulation model | Significant Unobservable Inputs (Level 3) | Universal Robots |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Contingent consideration |  |  | $ 21,301 |
Monte Carlo simulation model | Revenue for the period July 1, 2015-December 31, 2017 | Universal Robots |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Target achievement, volatility |  |  | 10.80% |
Discount rate |  |  | 3.30% |
Monte Carlo simulation model | Revenue for the period July 1, 2015-December 31, 2018 | Universal Robots |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Target achievement, volatility |  |  | 10.80% |
Discount rate |  |  | 3.30% |
[1] | Teradyne paid this amount in January 2017.

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