Fair Values of Financial Instruments - Summary of Reconciliation of Acquisition Related Contingent Consideration (Detail) - USD ($) $ in Thousands		3 Months Ended
		Apr. 01, 2018	Apr. 02, 2017
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Payment of acquisition related contingent consideration		$ 5,882
(Favorable)/unfavorable fair value adjustment		(5,186)	$ 12,246
Level 3 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance - Level 3 liability		381,291	253,437
Measurement period adjustment	[1]	(1,059)
Payment of acquisition related contingent consideration		(5,882)
Reclassification to current payables		(360)	(4,047)
(Favorable)/unfavorable fair value adjustment		(5,186)	12,246
Ending balance - Level 3 liability		$ 368,804	303,952
Level 3 [Member] | System Transformation Transactions [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Increase due to acquisitions			$ 42,316

[1] Measurement period adjustments relate to post-closing adjustments made in accordance with the terms and conditions of the April 2017 Distribution APA and the April 2017 Manufacturing APA.