Fair Value of Financial Instruments - Summary of Reconciliation of Acquisition Related Contingent Consideration (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value adjustment - (income) expense	$ (7,365)	$ 3,992	$ 26,060	$ 3,003
Ending balance - Level 3 liability	218,408	93,064	218,408	93,064
Level 3 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Opening balance - Level 3 liability	228,768	94,068	136,570	46,850
Increase due to acquisitions			68,039	50,312
Decrease due to measurement period adjustments		(3,371)		(3,371)
Payments/accruals	(2,995)	(1,625)	(12,261)	(3,730)
Fair value adjustment - (income) expense	(7,365)	3,992	26,060	3,003
Ending balance - Level 3 liability	$ 218,408	$ 93,064	$ 218,408	$ 93,064