Acquisitions (Narrative) (Detail) (USD $)	3 Months Ended	9 Months Ended					9 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 25, 2011	Sep. 30, 2012 Intellectual Property [Member]	Sep. 30, 2012 In Process Research And Development	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Minimum [Member] Intellectual Property [Member]	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Maximum [Member] Intellectual Property [Member]	Jun. 22, 2012 Hotspur Technologies	Jun. 22, 2012 Semprus BioSciences	May 03, 2012 Axiom Technology Partners LLC	Apr. 05, 2012 EZ-Blocker Product Line
Initial payment made on acquisition	$ 55,800,000	$ 55,800,000								$ 15,000,000	$ 30,000,000	$ 7,500,000	$ 3,300,000
Aggregate contingent consideration paid on achievement of specified objectives	58,885,000	58,885,000	9,566,000			2,000,000		90,000,000
Fair value of the consideration at the date of acquisition	111,600,000	111,600,000
Estimated fair value of the consideration to be paid to former security holders	55,800,000	55,800,000
Business acquisitions, transaction expenses	500,000	1,200,000
Business acquisitions, operating loss	4,500,000	6,100,000
Estimated fair value intangible assets acquired				$ 46,900,000	$ 45,500,000
Useful life of intangible assets acquired, years							15 years		20 years