Net gain on sale of vascular operations - Disc Ops - Additional Information (Detail) (Vascular operation [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2010 D Y Agreement M
Vascular operation [Member]
Assets Disposed of by Method Other than Sale, in Period of Disposition [Line Items]
Proceeds from sale of non-core operation, net of litigation	$ 27.7
Period of operational support with respect to the transport assets, maximum (in months)	5
Number of supply agreements covered by transition services agreement	2
Period of supply agreement (in years)	2
Period of agreements to provide other products (in days)	90
Period of non competition agreement (in years)	5
Number of supply agreements completed	1