Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Net sales		$ 1,726,540	$ 1,664,170	$ 3,304,250	$ 3,147,276
Direct Contribution		304,779	286,510	608,606	507,522
Corporate and unallocated costs		(146,577)	(130,172)	(305,722)	(251,527)
Amortization of intangible assets		(90,485)	(91,012)	(205,193)	(184,657)
Impairment of goodwill				(3,400)
Integration, acquisition, restructuring and other		(22,844)	(9,690)	(36,499)	(19,785)
Operating income		44,873	55,636	57,792	51,553
Interest expense		23,647	23,344	46,173	43,027
(Gain) loss on investments		(844)	3,609	(317)	8,139
Interest income		(1,792)	(1,788)	(3,324)	(3,709)
(Gain) loss on foreign currency		(824)	9,373	4,009	14,113
Other expense (income), net		(169)	926	(61)	841
Income (loss) before income taxes		24,855	20,172	11,312	(10,858)
Operating Segments | CPE
Segment Reporting Information [Line Items]
Net sales		1,008,131	1,155,883	1,883,357	2,210,939
Direct Contribution		85,723	113,852	135,484	222,764
Operating Segments | N&C
Segment Reporting Information [Line Items]
Net sales		549,496	510,972	1,087,760	941,408
Direct Contribution		201,282	172,658	429,820	284,758
Operating Segments | Enterprise
Segment Reporting Information [Line Items]
Net sales		172,240		342,154
Direct Contribution		17,774		43,302
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	[1]	(3,327)	(2,685)	(9,021)	(5,071)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Amortization of intangible assets		(90,485)	(91,012)	(205,193)	(184,657)
Integration, acquisition, restructuring and other		$ (22,844)	$ (9,690)	$ (36,499)	$ (19,785)

[1] Adjustments related acquisition accounting impacts related to deferred revenue