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.