Severance, Restructuring and Acquisition Integration Activities - Severance, Restructuring and Integration Costs by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Restructuring Cost and Reserve [Line Items]
Total Costs	$ 16,679	$ 12,795	$ 32,839	$ 27,072
Broadcast Solutions
Restructuring Cost and Reserve [Line Items]
Total Costs	3,056	174	4,434	5,871
Enterprise Solutions
Restructuring Cost and Reserve [Line Items]
Total Costs	6,253	5,573	19,267	7,280
Industrial Solutions
Restructuring Cost and Reserve [Line Items]
Total Costs	6,840	4,746	8,307	7,982
Network Solutions
Restructuring Cost and Reserve [Line Items]
Total Costs	530	2,302	831	5,939
Severance
Restructuring Cost and Reserve [Line Items]
Severance	1,934	1,152	4,263	4,885
Severance | Broadcast Solutions
Restructuring Cost and Reserve [Line Items]
Severance	510	(114)	559	(865)
Severance | Enterprise Solutions
Restructuring Cost and Reserve [Line Items]
Severance	712	(21)	2,839	55
Severance | Industrial Solutions
Restructuring Cost and Reserve [Line Items]
Severance	712	184	865	1,961
Severance | Network Solutions
Restructuring Cost and Reserve [Line Items]
Severance	0	1,103	0	3,734
Other Restructuring and Integration Costs
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	14,745	11,643	28,576	22,187
Other Restructuring and Integration Costs | Broadcast Solutions
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	2,546	288	3,875	6,736
Other Restructuring and Integration Costs | Enterprise Solutions
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	5,541	5,594	16,428	7,225
Other Restructuring and Integration Costs | Industrial Solutions
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	6,128	4,562	7,442	6,021
Other Restructuring and Integration Costs | Network Solutions
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	$ 530	$ 1,199	$ 831	$ 2,205