Operating Segments - Reconciliation of Total Reportable Segments' Revenues and EBITDA to Consolidated Revenues and Consolidated Income (Loss) from Continuing Operations Before Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Revenues	$ 585,755	$ 600,891	$ 1,132,712	$ 1,088,581
Amortization of intangibles	(25,917)	(15,795)	(52,421)	(27,536)
Severance, restructuring, and acquisition integration costs	(4,907)	(38,208)	(19,390)	(39,651)
Depreciation expense	(11,700)	(11,400)	(23,200)	(20,900)
Income from equity method investment	343	1,256	1,111	2,210
Consolidated operating income	44,143	12,326	49,041	61,837
Interest expense, net	(24,769)	(18,092)	(48,615)	(36,762)
Consolidated income (loss) from continuing operations before taxes	19,374	(5,766)	426	25,075
Reportable Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Revenues	598,513	605,054	1,167,964	1,093,361
Deferred revenue adjustments	(12,758)	(4,163)	(35,252)	(4,780)
Total Segment EBITDA	100,345	89,253	188,619	162,869
Amortization of intangibles	(25,917)	(15,795)	(52,421)	(27,536)
Deferred gross profit adjustments	(13,440)	(3,915)	(35,098)	(4,365)
Severance, restructuring, and acquisition integration costs	(4,907)	(38,208)	(19,390)	(39,651)
Depreciation expense	(11,692)	(11,400)	(23,233)	(20,897)
Purchase accounting effects related to acquisitions		(8,163)	(9,422)	(9,015)
Income from equity method investment	343	1,256	1,111	2,210
Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income	$ (589)	$ (702)	$ (1,125)	$ (1,778)