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Acquisitions and Investment In Other Company - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 25, 2018
Feb. 26, 2018
Jan. 30, 2019
Jul. 01, 2018
Jul. 01, 2018
Jun. 30, 2019
Jun. 03, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                
Contingent consideration             $ 30,800,000
Goodwill           383,936,000   381,850,000
Estimate of Fair Value Measurement [Member]                
Business Acquisition [Line Items]                
Contingent consideration           26,847,000   $ 70,543,000
Revenues       $ 400,000 $ 400,000      
Real War In [Member]                
Business Acquisition [Line Items]                
Equity Method Investments             $ 15,000,000.0  
Investments, Fair Value Disclosure           15,000,000.0    
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           $ 84,100,000    
Goodwill, not deductible for tax purposes 136,000,000.0              
Net income       101,780,000 186,787,000      
Goodwill $ 135,976,000              
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 7 years 2 months 12 days              
Mobile Industrial Robots (MiR) | Acquisition Related Costs                
Business Acquisition [Line Items]                
Net income       $ 2,300,000 $ 2,900,000      
Energid Technologies Corporation                
Business Acquisition [Line Items]                
Total preliminary purchase price   $ 27,600,000            
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   $ 1,000,000.0            
Lemsys [Member]                
Business Acquisition [Line Items]                
Total preliminary purchase price     $ 1,400,000          
Total preliminary purchase price     9,100,000          
Acquired value of intangible assets     $ 4,600,000          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     5 years 2 months 12 days          
Net tangible assets     $ 3,100,000