Fair Value of Financial Instruments - Summary of Reconciliation of Acquisition Related Contingent Consideration (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2016	Jun. 28, 2015	Jul. 03, 2016	Jun. 28, 2015
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value adjustment - (income) expense	$ (16,274)	$ 6,078	$ (33,425)	$ 989
Ending balance	228,768	94,068	228,768	94,068
Level 3 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Opening balance	177,933	98,505	136,570	46,850
Increase due to acquisitions	36,868	3,029	68,039	50,312
Payments/accruals	(2,307)	(1,388)	(9,266)	(2,105)
Fair value adjustment - (income) expense	16,274	(6,078)	33,425	(989)
Ending balance	$ 228,768	$ 94,068	$ 228,768	$ 94,068