Fair Value Measurements of Assets and Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012 U.S. Spine Reporting Unit [Member]	Dec. 31, 2011 U.S. Spine Reporting Unit [Member]
Fair Value Measurements Disclosure [Line Items]
Implied fair value, Goodwill	$ 41.0		$ 41.0	$ 41.0	$ 137.0
Non-cash Goodwill impairment charges	96.0		96.0	96.0
Impairment charges in Special items related to indefinite lived intangible assets		$ 2.8	$ 11.6