Restructuring and Related Charges - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 03, 2015 USD ($)	Jun. 27, 2014 USD ($)	Jul. 03, 2015 USD ($) Employees	Jun. 27, 2014 USD ($) Employees	Dec. 31, 2014 USD ($) Employees	Dec. 31, 2013 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 185,000	$ 284,000	$ 229,000	$ 512,000
Harmonic Two Thousand And Fifteen Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			246,000		$ 2,200,000
Harmonic 2013 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		$ 284,000		$ 512,000	900,000	$ 2,200,000
Fixed Asset Impairment [Member] | Harmonic Two Thousand And Fifteen Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges					1,100,000
Contract Termination [Member] | Harmonic Two Thousand And Fifteen Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges					300,000
Other Restructuring [Member] | Harmonic Two Thousand And Fifteen Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0		100,000
Employee Severance And Benefit Arrangements [Member] | Harmonic Two Thousand And Fifteen Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 246,000		$ 600,000
Number of positions eliminated | Employees			5		19
Restructuring and Related Cost, Incurred Cost	$ 185,000		$ 229,000
Employee Severance And Benefit Arrangements [Member] | Harmonic 2013 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | Employees				20