Fair Values of Financial Instruments - Summary of Acquisition Related Contingent Consideration Liability (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Sep. 27, 2020	Oct. 01, 2021	Sep. 27, 2020
Business Combination, Contingent Consideration, Liability [Roll Forward]
Payments of acquisition related contingent consideration			$ (28,640)	$ (31,999)
Increase in fair value			90,905	35,068
Level 3
Business Combination, Contingent Consideration, Liability [Roll Forward]
Beginning balance - Level 3 liability	$ 473,055	$ 441,113	434,694	446,684
Payments of acquisition related contingent consideration	(8,720)	(11,468)	(28,640)	(31,999)
Reclassification to current payables	(1,600)	(800)	(300)	(1,100)
Increase in fair value	33,924	19,808	90,905	35,068
Ending balance - Level 3 liability	$ 496,659	$ 448,653	$ 496,659	$ 448,653