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Final Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 25, 2018
Business Acquisition [Line Items]        
Goodwill $ 453,859 $ 416,431 $ 381,850  
Autoguide LLC [Member]        
Business Acquisition [Line Items]        
Goodwill 41,223      
Intangible assets 37,660      
Other current assets 3,661      
Non-current assets 1,227      
Accounts payable and current liabilities (1,223)      
Other long-term liabilities (949)      
Total purchase price $ 81,599      
Mobile Industrial Robots (MiR)        
Business Acquisition [Line Items]        
Goodwill       $ 135,976
Intangible assets       80,670
Current assets       6,039
Non-current assets       1,336
Accounts payable and current liabilities       (7,336)
Long-term deferred tax liabilities       (18,007)
Other long-term liabilities       (900)
Total purchase price       $ 197,778