Operating Segments - Reconciliation of Total Reportable Segments' Revenues and EBITDA to Consolidated Revenues and Consolidated Income from Continuing Operations Before Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Revenues	$ 605,565	$ 551,381
Amortization of intangibles	(24,418)	(23,669)
Severance, restructuring, and acquisition integration costs	(20,394)	(6,600)
Depreciation expense	(11,900)	(11,400)
Operating income	44,203	51,597
Interest expense, net	(16,978)	(23,506)
Non-operating pension costs	(275)	(260)
Loss on debt extinguishment	(19,960)	0
Income before taxes	6,990	27,831
Reportable Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Revenues	607,423	551,381
Deferred revenue adjustments	(1,858)	0
Consolidated Revenues	605,565	551,381
Total Segment EBITDA	103,878	93,370
Amortization of intangibles	(24,418)	(23,669)
Severance, restructuring, and acquisition integration costs	(20,394)	(6,600)
Depreciation expense	(11,865)	(11,383)
Purchase accounting effects related to acquisitions	(502)	0
Amortization of software development costs	(236)	0
Loss on sale of assets	(94)	0
Income from equity method investment	0	1,007
Eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ (308)	$ (1,128)