Fair Values of Financial Instruments - Summary of Reconciliation of Acquisition Related Contingent Consideration (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Business Combination, Contingent Consideration, Liability [Roll Forward]
Payments of acquisition related contingent consideration	$ (10,452)	$ (6,237)
Increase in fair value	712	14,046
Level 3
Business Combination, Contingent Consideration, Liability [Roll Forward]
Beginning balance - Level 3 liability	446,684	382,898
Payments of acquisition related contingent consideration	(10,452)	(6,237)
Reclassification to current payables	150	2,300
Increase in fair value	712	14,046
Ending balance - Level 3 liability	$ 437,094	$ 393,007