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Acquisitions - Additional Information (Detail) - USD ($)
 8 Months Ended 12 Months Ended
Apr. 25, 2018
Feb. 26, 2018
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]            
Contingent consideration     $ 31,000,000 $ 31,000,000    
Revenues     24,100,000      
Income (loss) before income taxes     (7,600,000)      
Goodwill     381,850,000 381,850,000 $ 252,011,000 $ 223,343,000
Mobile Industrial Robots (MiR)            
Business Acquisition [Line Items]            
Total preliminary purchase price $ 197,778,000          
Cash paid to acquire outstanding common and preferred stock 145,200,000          
Contingent consideration 52,600,000          
Arrangement range of outcomes value high     $ 115,000,000 115,000,000    
Goodwill, not deductible for tax purposes 136,000,000          
Net income       450,559,000 243,399,000  
Goodwill $ 135,976,000          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 7 years 2 months 12 days          
Mobile Industrial Robots (MiR) | Fair Value Adjustment to Inventory            
Business Acquisition [Line Items]            
Net income       400,000 2,900,000  
Mobile Industrial Robots (MiR) | Acquisition Related Costs            
Business Acquisition [Line Items]            
Net income       $ 2,900,000 $ 400,000  
Energid Technologies Corporation            
Business Acquisition [Line Items]            
Total preliminary purchase price   $ 28,000,000        
Goodwill   14,400,000        
Acquired value of intangible assets   $ 12,300,000        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   7 years 8 months 12 days        
Net tangible assets   $ 1,000,000