Quantitative Information Associated With Fair Value Measurement of Level 3 Financial Instrument (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jul. 01, 2018	Apr. 25, 2018
Mobile Industrial Robots (MiR)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration		$ 51,400
Monte Carlo Simulation | Revenue for the period July 1, 2015-December 31, 2018 | Universal Robots (UR)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Target achievement, volatility	11.40%
Discount Rate	3.20%
Monte Carlo Simulation | Revenue for the period July 1, 2015-December 31, 2018 | Universal Robots (UR) | Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration	$ 12,081
Monte Carlo Simulation | Revenue for the period January 1, 2018-December 31, 2018 | Mobile Industrial Robots (MiR)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Target achievement, volatility	18.00%
Discount Rate	0.50%
Monte Carlo Simulation | Revenue for the period January 1, 2018-December 31, 2018 | Mobile Industrial Robots (MiR) | Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration	$ 48,833