Commitments and Contingencies - Additional Information (Detail) $ in Thousands		9 Months Ended	12 Months Ended
	Sep. 21, 2015 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2016 EUR (€)
Operating Leased Assets [Line Items]
Fair value of contingent consideration		$ 25,200	$ 23,500
Senhance Surgical Robotic System Acquisition [Member]
Operating Leased Assets [Line Items]
Fair value of contingent consideration	$ 23,900	$ 25,200
Senhance Surgical Robotic System Acquisition [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Aggregate milestone payments | €				€ 27,500,000