Severance, Restructuring and Acquisition Integration Activities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	$ 3,775	$ 20,394
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and integration cost payable period	60 days
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	$ 600	9,400
Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	2,800	9,400
Research and Development
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	400	1,600
Grass Valley And SAM Integration Program
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	$ 3,000	9,200
Industrial Manufacturing Footprint Program
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		$ 7,500