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Allocation of Final Purchase Price (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 11, 2015
Business Acquisition [Line Items]        
Goodwill $ 252,011 $ 223,343 $ 488,413  
Universal Robots        
Business Acquisition [Line Items]        
Goodwill       $ 221,128
Intangible assets       121,590
Current assets       10,853
Non-current assets       3,415
Accounts payable and current liabilities       (11,976)
Long-term deferred tax liabilities       (26,653)
Long-term other liabilities       (2,920)
Total purchase price       $ 315,437