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
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Revenues	$ 579,266	$ 610,774	$ 1,711,978	$ 1,699,355
Amortization of intangibles	(25,669)	(15,203)	(78,090)	(42,739)
Severance, restructuring, and acquisition integration costs	(14,143)	(9,158)	(33,533)	(48,809)
Depreciation expense	(11,800)	(10,700)	(35,100)	(31,600)
Income from equity method investment	348	1,030	1,459	3,240
Consolidated operating income	34,502	58,011	83,543	119,848
Interest expense, net	(25,416)	(21,497)	(74,031)	(58,259)
Consolidated income from continuing operations before taxes	9,086	36,514	9,512	61,589
Reportable Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Revenues	590,115	613,131	1,758,079	1,706,492
Deferred revenue adjustments	(10,849)	(2,357)	(46,101)	(7,137)
Total Segment EBITDA	98,043	96,285	286,662	259,154
Amortization of intangibles	(25,669)	(15,203)	(78,090)	(42,739)
Deferred gross profit adjustments	(11,328)	(2,357)	(46,426)	(6,722)
Severance, restructuring, and acquisition integration costs	(14,143)	(9,158)	(33,533)	(48,809)
Depreciation expense	(11,818)	(10,746)	(35,051)	(31,643)
Purchase accounting effects related to acquisitions		(858)	(9,422)	(9,873)
Income from equity method investment	348	1,030	1,459	3,240
Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income	$ (931)	$ (982)	$ (2,056)	$ (2,760)