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Allocation of Preliminary Purchase Price (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Apr. 25, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 392,998   $ 252,011
Mobile Industrial Robots (MiR)      
Business Acquisition [Line Items]      
Goodwill   $ 134,737  
Intangible assets   80,670  
Current assets   6,039  
Non-current assets   299  
Accounts payable and current liabilities   (7,336)  
Long-term deferred tax liabilities   (17,779)  
Total purchase price   $ 196,630