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Acquisition of ALF-X Surgical Robotic System - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 21, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Goodwill $ 130,869   $ 93,842 $ 93,842
ALF-X Surgical Robotic System Acquisition [Member]        
Business Acquisition [Line Items]        
Accounts receivable   $ 78    
Inventories   2,800    
Current deferred tax asset   526    
Other current assets   4,180    
Property and equipment   1,384    
Intellectual property   48,500    
In-process research and development   17,100    
Goodwill $ 38,300 38,348    
Total assets acquired   112,916    
Accounts payable and other liabilities   1,915    
Long-term deferred tax liabilities   18,424    
Net assets acquired   $ 92,577