Fair Values of Financial Instruments - Summary of Reconciliation of Acquisition Related Contingent Consideration Liability (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 29, 2019	Dec. 30, 2018
Business Combination, Contingent Consideration, Liability [Roll Forward]
Payment of acquisition related contingent consideration	$ (43,400)	$ (27,182)	$ (24,683)
Increase in fair value	31,210	92,788	28,767
Level 3
Business Combination, Contingent Consideration, Liability [Roll Forward]
Beginning balance - Level 3 liability	446,684	382,898
Payment of acquisition related contingent consideration	(43,400)	(27,182)
Reclassification to current payables	200	(1,820)
Increase in fair value	31,210	92,788
Ending balance - Level 3 liability	$ 434,694	$ 446,684	$ 382,898