Fair Value Measurement - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Fair Value Measurements [Line Items]
Reversal of contingent consideration	$ 4,400,000	$ 6,600,000	$ 6,617,000	$ 8,100,000
Contingent consideration	13,700,000		13,700,000
Current contingent consideration	3,000,000		3,000,000
Other liabilities	10,700,000		10,700,000
Minimum
Fair Value Measurements [Line Items]
Fair value of contingent consideration liability associated with future milestone	0		0
Maximum
Fair Value Measurements [Line Items]
Fair value of contingent consideration liability associated with future milestone	$ 56,500,000		$ 56,500,000