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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
state
patient
Defendant
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Operating lease maximum term (in years) 15 years    
Other commitments $ 478.1    
Pre-tax settlement charges 11.7    
Commitments And Contingencies [Line Items]      
Accrued liabilities, product liability claims $ 12.8 $ 20.5  
da Vinci Surgical System Product Liability Matters      
Commitments And Contingencies [Line Items]      
Number of individual defendants involved in lawsuit | Defendant 43    
Number of patients on behalf of which damages are sought | patient 55    
Number of Surgeries Performed with da Vinci Surgical System in United States | state 22    
Estimated cost of settling product liability claims $ 16.3 $ 8.3 $ 13.8