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Restructuring and Excess Facilities - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Employees
Dec. 31, 2014
USD ($)
Employees
Employee
Dec. 31, 2013
USD ($)
Employees
Employee
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost $ 1,485 $ 3,076 $ 2,244
Restructuring and asset impairment charges 1,372 2,761 1,421
Harmonic 2015 Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve 264 322  
Restructuring charges in continued operations 1,617 2,169  
Harmonic 2015 Restructuring [Member] | Fixed Asset Impairment [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve 0 0  
Restructuring charges in continued operations $ 0 $ 1,138  
Harmonic 2015 Restructuring [Member] | Severance [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Number of Positions Eliminated | Employees 37 19  
Restructuring reserve $ 264 $ 305  
Restructuring charges in continued operations 1,413 599  
Harmonic 2015 Restructuring [Member] | Contract Termination [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve 0 0  
Restructuring charges in continued operations 0 307  
Harmonic 2015 Restructuring [Member] | Other Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve 0 17  
Restructuring charges in continued operations $ 204 125  
Harmonic 2013 Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost   900 2,200
Restructuring reserve   0 179
Restructuring charges in continued operations   924 2,168
Harmonic 2013 Restructuring [Member] | Inventory Valuation and Obsolescence [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve   0 0
Restructuring charges in continued operations   0 404
Harmonic 2013 Restructuring [Member] | Excess Facilities [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve   0 0
Restructuring charges in continued operations   $ 32 $ 0
Harmonic 2013 Restructuring [Member] | Severance [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Number of Positions Eliminated | Employee   25 85
Restructuring reserve   $ 0 $ 179
Restructuring charges in continued operations   829 1,663
Harmonic 2013 Restructuring [Member] | Contract Termination [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve   0 0
Restructuring charges in continued operations   63 0
Harmonic 2013 Restructuring [Member] | Leasehold Improvements [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve   0 0
Restructuring charges in continued operations   0 101
HFC Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges. Discontinued Operations     600
Restructuring reserve   0 $ 13
HFC Restructuring [Member] | Severance [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Number of Positions Eliminated | Employees     19
Restructuring reserve   0 $ 13
HFC Restructuring [Member] | Contract Termination [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve   $ 0 $ 0