Fair Value Measurement - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended								3 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012	Dec. 31, 2012	Jul. 16, 2013 Subsequent Event Senior Credit Facility	Sep. 30, 2013 Subsequent Event Senior Credit Facility Term Loan	Jul. 16, 2013 Subsequent Event Senior Credit Facility Term Loan	Jun. 30, 2013 Minimum	Jun. 30, 2013 Maximum	Apr. 01, 2012 Significant Unobservable Inputs (Level 3)
Fair Value Measurements [Line Items]
Reversal of contingent consideration	$ 6,600,000		$ 8,100,000
Carrying amount of long-term debt	970,825,000		970,825,000		965,280,000
Credit facility						775,000,000	375,000,000	375,000,000
Goodwill impairment		332,000,000		332,128,000							332,000,000
Fair value of contingent consideration liability associated with future milestone									5,000,000	84,900,000
Contingent consideration	32,500,000		32,500,000
Current contingent consideration	12,400,000		12,400,000
Other liabilities	$ 20,100,000		$ 20,100,000