Fair Values of Financial Instruments - Summary of Reconciliation of Acquisition Related Contingent Consideration (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value adjustment	$ 12,246	$ 17,151
Level 3 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Opening balance - Level 3 liability	253,437	136,570
Increase due to acquisitions	42,316	31,171
Payments/current payables	(4,047)	(6,959)
Fair value adjustment	12,246	17,151
Ending balance - Level 3 liability	$ 303,952	$ 177,933