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		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Revenues	$ 601,109	$ 579,266	$ 1,744,237	$ 1,711,978
Amortization of intangibles	(23,808)	(25,669)	(75,603)	(78,090)
Severance, restructuring, and acquisition integration costs	(12,795)	(14,143)	(27,072)	(33,533)
Depreciation expense	(11,600)	(11,800)	(35,300)	(35,100)
Operating income	61,980	34,502	165,185	83,543
Interest expense, net	(23,513)	(25,416)	(71,958)	(74,031)
Income from continuing operations before taxes	38,467	9,086	93,227	9,512
Reportable Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Revenues	602,468	590,115	1,749,649	1,758,079
Deferred revenue adjustments	(1,359)	(10,849)	(5,412)	(46,101)
Consolidated Revenues	601,109	579,266	1,744,237	1,711,978
Total Segment EBITDA	111,936	98,005	310,337	286,602
Amortization of intangibles	(23,808)	(25,669)	(75,603)	(78,090)
Deferred gross profit adjustments	(1,359)	(11,328)	(5,412)	(46,426)
Severance, restructuring, and acquisition integration costs	(12,795)	(14,143)	(27,072)	(33,533)
Depreciation expense	(11,603)	(11,818)	(35,253)	(35,051)
Purchase accounting effects related to acquisitions	0	0	(195)	(9,422)
Income from equity method investment	586	348	1,077	1,459
Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ (977)	$ (893)	$ (2,694)	$ (1,996)