Severance, Restructuring and Acquisition Integration Activities - Summary of Severance Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Mar. 29, 2015
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	$ 8,408	$ 14,483
Grass Valley Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	4,100
Industrial Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	3,500
Employee Severance [Member] | Grass Valley Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	12,085
Severance, restructuring, and acquisition integration costs	1,001
Cash payments	(4,116)
Foreign currency translation	118
Other adjustments	(2,266)
Ending balance	6,822
Employee Severance [Member] | Industrial Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	2,643
Severance, restructuring, and acquisition integration costs	2,572
Cash payments	(1,424)
Foreign currency translation	92
Other adjustments	(144)
Ending balance	$ 3,739