Distribution Agreements, Net - Reconciliation of Activity for Other Identifiable Intangible Assets Net (Detail) - Distribution Agreements [Member] - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2019	Jul. 01, 2018
Finite Lived Intangible Assets [Line Items]
Total Other Identifiable Intangible Assets, Beginning Balance		$ 900,383	$ 913,352
Other distribution agreements		(10)
Measurement period adjustment	[1]		5,100
Additional accumulated amortization		(12,135)	(11,856)
Total Other Identifiable Intangible Assets, Ending Balance		$ 888,238	$ 906,596

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