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Quantitative Information Associated With Fair Value Measurement of Level 3 Financial Instrument (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Apr. 25, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Contingent consideration |  | $ 30,800 |
Mobile Industrial Robots (MiR) |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Contingent consideration |  |  | $ 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 | 17.00% |  |
Discount Rate | 0.40% |  |
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 | $ 38,313 |  |

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