Business Combinations - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
	Jul. 13, 2016	Dec. 31, 2016	Jun. 30, 2017	Mar. 31, 2017
LDR Holding Corporation [Member]
Business Acquisition [Line Items]
Total consideration	$ 1,138.0
Merger consideration compensation expense	24.1
Net assets acquired	$ 1,113.9		$ 1,113.9	$ 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