Distribution Agreements, Net - Reconciliation of Activity for Other Identifiable Intangible Assets Net (Detail) - Distribution Agreements [Member] - USD ($) $ in Thousands		9 Months Ended
		Sep. 29, 2019	Sep. 30, 2018
Finite Lived Intangible Assets [Line Items]
Total Other Identifiable Intangible Assets, Beginning Balance		$ 900,383	$ 913,352
Other distribution agreements		(10)	1,668
Measurement period adjustment	[1]		4,700
Additional accumulated amortization		(18,206)	(17,889)
Total Other Identifiable Intangible Assets, Ending Balance		$ 882,167	$ 901,831

[1] Measurement period adjustments relate to post-closing adjustments made in accordance with the terms and conditions of the applicable asset purchase agreement or asset exchange agreement for distribution territories acquired or exchanged by the Company in October 2017 as part of the System Transformation. All final post-closing adjustments for this transaction were completed during 2018.