Fair Values of Financial Instruments - Summary of Reconciliation of Acquisition Related Contingent Consideration (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Unfavorable fair value adjustment			$ 28,365	$ 33,425
Level 3 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Opening balance - Level 3 liability	$ 303,952	$ 177,933	253,437	136,570
Increase due to acquisitions	3,770	36,868	46,086	68,039
Payments/current payables	(4,739)	(2,307)	(8,786)	(9,266)
Unfavorable fair value adjustment	16,119	16,274	28,365	33,425
Ending balance - Level 3 liability	$ 319,102	$ 228,768	$ 319,102	$ 228,768