Goodwill, In-Process Research and Development and Intangible Assets - Additional Information (Detail) - USD ($)	Sep. 21, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Sep. 03, 2013	Dec. 31, 2009
Goodwill And Intangible Assets [Line Items]
Goodwill		$ 130,869,000	$ 93,842,000	$ 93,842,000
Accumulated impairment losses on goodwill		0
In-process research and development		16,511,000
Patent purchased amount		53,500,000	5,000,000
In-Process Research and Development [Member]
Goodwill And Intangible Assets [Line Items]
In-process research and development		16,511,000
Discount rate	45.00%
Intellectual Property [Member]
Goodwill And Intangible Assets [Line Items]
Discount rate	45.00%
Patents [Member]
Goodwill And Intangible Assets [Line Items]
Patent purchased amount		5,000,000	$ 5,000,000			$ 5,000,000
ALF-X Surgical Robotic System Acquisition [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 38,348,000	38,300,000
Intellectual property	48,500,000
ALF-X Surgical Robotic System Acquisition [Member] | In-Process Research and Development [Member]
Goodwill And Intangible Assets [Line Items]
In-process research and development	$ 17,100,000
Safe Stitch Medical Inc [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill		$ 93,800,000			$ 93,842,000