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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
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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

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