Acquisition and Divestitures - Reddick Divestiture - Additional Information (Detail) - Specialty Surgical Instrumentation, Inc [Member] - Reddick Cholangiogram Catheter and Reddick Saye-Screw [Member] - USD ($)		9 Months Ended
	Apr. 05, 2018	Sep. 30, 2018
Business Acquisition [Line Items]
Proceeds from sale of assets	$ 7,400,000
Gain on sale of assets		$ 5,900,000
Purchase agreement period	2 years
Balloon Supply Agreement [Member]
Business Acquisition [Line Items]
Purchase agreement period	6 years