Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) state patient Defendant	Dec. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating lease maximum term (in years)	15 years
Other commitments	$ 345.8
Commitments And Contingencies [Line Items]
Accrued liabilities, product liability claims	$ 20.5	$ 24.4
da Vinci Surgical System Product Liability Matters
Commitments And Contingencies [Line Items]
Number of individual defendants involved in lawsuit | Defendant	52
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
Loss Contingency Accrual, Period Increase (Decrease)	$ 8.3	$ 13.8