Business Combinations - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 13, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill impairment charge				$ 32.7
Office Based Technologies [Member]
Business Acquisition [Line Items]
Goodwill impairment charge		$ 32.7		$ 32.7
LDR Holding Corporation [Member]
Business Acquisition [Line Items]
Total consideration	$ 1,138.0
Merger consideration compensation expense	24.1		$ 24.1		$ 24.1
Net assets acquired	$ 1,113.9
Cayenne Medical, CTC, CDD and MedTech [Member]
Business Acquisition [Line Items]
Total consideration						$ 441.7
Net assets acquired						499.7
Contingent consideration fair value						$ 58.0