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. 02, 2017	Apr. 03, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Revenues	$ 551,381	$ 541,497
Amortization of intangibles	(23,669)	(25,532)
Depreciation expense	(11,400)	(11,700)
Severance, restructuring, and acquisition integration costs	(6,600)	(8,408)
Operating income	51,337	40,964
Interest expense, net	(23,506)	(24,396)
Income before taxes	27,831	16,568
Reportable Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Revenues	551,381	543,800
Deferred revenue adjustments	0	(2,303)
Consolidated Revenues	551,381	541,497
Total Segment EBITDA	93,110	90,066
Amortization of intangibles	(23,669)	(25,532)
Depreciation expense	(11,383)	(11,663)
Severance, restructuring, and acquisition integration costs	(6,600)	(8,408)
Deferred gross profit adjustments	0	(2,303)
Purchase accounting effects related to acquisitions	0	(195)
Income from equity method investment	1,007	(170)
Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ (1,128)	$ (831)