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Quantitative Information Associated With Fair Value Measurement of Level 3 Financial Instrument (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Nov. 13, 2019 | Dec. 31, 2018 | Apr. 25, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Contingent consideration |  | $ 9,100 | $ 24,000 |  | $ 30,800
Mobile Industrial Robots (MiR) |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Contingent consideration |  | $ 9,100 |  | $ 31,000 | $ 52,600
Monte Carlo Simulation | Revenue for the period July 1, 2015-December 31, 2018 | Mobile Industrial Robots (MiR) |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Target achievement, volatility |  | 11.50% |  |  |
Discount rate |  | 2.60% |  |  |
Monte Carlo Simulation | Revenue for the period July 1, 2015-December 31, 2018 | Significant Unobservable Inputs (Level 3) | Mobile Industrial Robots (MiR) |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Contingent consideration | [1] | $ 26,952 |  |  |
Monte Carlo Simulation | Revenue for the period July 1, 2018-December 31, 2018 | Universal Robots (UR) |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Target achievement, volatility |  | 14.00% |  |  |
Discount rate |  | 0.20% |  |  |
Monte Carlo Simulation | Revenue for the period July 1, 2018-December 31, 2018 | Significant Unobservable Inputs (Level 3) | Universal Robots (UR) |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Contingent consideration | [1] | $ 12,753 |  |  |
[1] | Contingent consideration related to MiR and Universal Robots acquisitions of $31.0 million and $3.9 million, respectively, is expected to be paid in March 2019.

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