Fair Value Measurement (Narrative) (Detail) (USD $)	3 Months Ended	9 Months Ended		3 Months Ended
	Apr. 01, 2012	Sep. 30, 2012	Dec. 31, 2011	Mar. 30, 2012 Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Maximum [Member]
Fair Value Measurements [Line Items]
Carrying amount of long-term debt		$ 962,596,000	$ 954,809,000
Goodwill impairment charge	332,000,000	332,128,000		332,000,000
Fair value of contingent consideration liability associated with future milestone					7,000,000	107,000,000
Contingent consideration		58,900,000
Current contingent consideration		21,600,000
Other liabilities		$ 37,300,000