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Final Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Apr. 25, 2018
Business Acquisition [Line Items]      
Goodwill $ 383,936 $ 381,850  
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