Acquisitions and Divestitures - Other 2015 Items - Additional Information (Detail) $ in Millions	1 Months Ended		12 Months Ended
	Aug. 31, 2015 USD ($)	May 31, 2015 USD ($) Agreement	Dec. 31, 2017
Business Acquisition [Line Items]
Weighted average useful life			8 years
Grex Medical Oy [Member]
Business Acquisition [Line Items]
Purchase price for acquisition of assets and rights	$ 0.2
Acquisition date of assets and rights			Jan. 01, 2016
UreSil, LLC, Distributors [Member]
Business Acquisition [Line Items]
Number of definitive agreements | Agreement		7
Intangible assets		$ 0.2
Weighted average useful life			3 years
Purchase price for acquisition of assets and rights		$ 0.2