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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, 2017
Jun. 11, 2015
Universal Robots    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Contingent consideration   $ 31,600
Significant Unobservable Inputs (Level 3) | Universal Robots    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Contingent consideration [1] $ 24,497  
Monte Carlo Simulation | Significant Unobservable Inputs (Level 3)    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Contingent consideration $ 20,605  
Monte Carlo Simulation | Revenue for the period July 1, 2015-December 31, 2017 | Universal Robots    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Target achievement, volatility 11.20%  
Discount Rate 3.30%  
[1] Contingent consideration of $24.5 million is expected to be paid in March 2018.