Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		81 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Mar. 01, 2013	Jun. 10, 2011
Loss Contingencies [Line Items]
Certain claims selling, general and administrative, net	$ 21.8	$ 47.0	$ 472.0
Self-insured retention amount	20.00%
Receivables in other assets	168.0		168.0
Compensatory damages awarded	27.6
Percentage of fault apportioned to plaintiffs	30.00%
Percentage of fault apportioned to company	34.00%
Percentage of fault apportioned to unrelated third party	36.00%
Verdict in full and entered judgment					20.3
Compensatory damages vacated				27.6
Stryker Corporation [Member]
Loss Contingencies [Line Items]
Number of patents infringed	3		3
Monetary damages for lost profits	70.0
Estimated charges	210.0		210.0
Durom Cup Related Claims [Member]
Loss Contingencies [Line Items]
Estimated liability outstanding	352.5		352.5
Estimated liability classified as short-term	50.0		50.0
Estimated liability classified as long-term	$ 302.5		$ 302.5
Period for payment of majority of claims	5 years