Fair Values of Financial Instruments - Summary of Acquisition Related Contingent Consideration Liability (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jun. 28, 2020	Jul. 02, 2021	Jun. 28, 2020
Business Combination, Contingent Consideration, Liability [Roll Forward]
Payments of acquisition related contingent consideration			$ (19,920)	$ (20,531)
Increase in fair value			56,981	15,260
Ending balance - Level 3 liability	$ 473,055	$ 441,113	473,055	441,113
Level 3
Business Combination, Contingent Consideration, Liability [Roll Forward]
Beginning balance - Level 3 liability	435,746	437,094	434,694	446,684
Payments of acquisition related contingent consideration	(9,874)	(10,079)	(19,920)	(20,531)
Reclassification to current payables	1,200	(450)	1,300	(300)
Increase in fair value	$ 45,983	$ 14,548	$ 56,981	$ 15,260