Operating Segments and Geographic Information - Operating Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Mar. 29, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Segment revenues	$ 541,497	$ 546,957
Depreciation expense	11,700	11,500
Amortization of intangibles	25,532	26,504
Severance, restructuring, and acquisition integration costs	8,408	14,483
Segment assets	3,223,595		$ 3,290,602
Broadcast Solutions [Member]
Segment Reporting Information [Line Items]
Severance, restructuring, and acquisition integration costs	4,378	11,527
Enterprise Connectivity Solutions [Member]
Segment Reporting Information [Line Items]
Severance, restructuring, and acquisition integration costs	500	568
Industrial Connectivity Solutions [Member]
Segment Reporting Information [Line Items]
Severance, restructuring, and acquisition integration costs	865	1,773
Network Security Solutions [Member]
Segment Reporting Information [Line Items]
Severance, restructuring, and acquisition integration costs		667
Reportable Segment [Member]
Segment Reporting Information [Line Items]
Segment revenues	543,800	569,451
Affiliate revenues	2,333	2,324
Segment EBITDA	90,066	88,297
Depreciation expense	11,663	11,541
Amortization of intangibles	25,532	26,504
Severance, restructuring, and acquisition integration costs	8,408	14,483
Purchase accounting effects of acquisitions	195	9,422
Deferred gross profit adjustments	2,303	21,658
Segment assets	919,853	991,410
Reportable Segment [Member] | Broadcast Solutions [Member]
Segment Reporting Information [Line Items]
Segment revenues	171,272	176,500
Affiliate revenues	424	102
Segment EBITDA	23,267	23,127
Depreciation expense	3,962	3,973
Amortization of intangibles	12,931	12,426
Severance, restructuring, and acquisition integration costs	4,378	11,527
Purchase accounting effects of acquisitions	195
Deferred gross profit adjustments	614	3,294
Segment assets	332,009	367,766
Reportable Segment [Member] | Enterprise Connectivity Solutions [Member]
Segment Reporting Information [Line Items]
Segment revenues	135,892	141,781
Affiliate revenues	1,699	1,870
Segment EBITDA	23,736	20,009
Depreciation expense	3,389	3,214
Amortization of intangibles	429	432
Severance, restructuring, and acquisition integration costs	500	568
Segment assets	233,422	260,529
Reportable Segment [Member] | Industrial Connectivity Solutions [Member]
Segment Reporting Information [Line Items]
Segment revenues	141,091	152,972
Affiliate revenues	182	323
Segment EBITDA	22,987	24,173
Depreciation expense	2,718	2,851
Amortization of intangibles	591	823
Severance, restructuring, and acquisition integration costs	865	1,773
Purchase accounting effects of acquisitions		267
Segment assets	248,971	257,059
Reportable Segment [Member] | Industrial IT Solutions [Member]
Segment Reporting Information [Line Items]
Segment revenues	53,882	61,073
Affiliate revenues	28	21
Segment EBITDA	8,609	11,087
Depreciation expense	524	559
Amortization of intangibles	1,510	1,410
Severance, restructuring, and acquisition integration costs	2,665	(52)
Segment assets	59,528	62,559
Reportable Segment [Member] | Network Security Solutions [Member]
Segment Reporting Information [Line Items]
Segment revenues	41,663	37,125
Affiliate revenues		8
Segment EBITDA	11,467	9,901
Depreciation expense	1,070	944
Amortization of intangibles	10,071	11,413
Severance, restructuring, and acquisition integration costs		667
Purchase accounting effects of acquisitions		9,155
Deferred gross profit adjustments	1,689	18,364
Segment assets	$ 45,923	$ 43,497