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Restructuring and Excess Facilities - Additional Information (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Employees
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
Jan. 04, 2016
USD ($)
Restructuring Cost and Reserve [Line Items]                
Gain From TVN Pension Curtailment   $ 0 $ 1,955          
Restructuring and Related Cost   6,586 [1] 18,002 $ 1,485        
Curtailment [2]   0 (1,955)          
Adjustments to restructuring provisions   5,307 14,602 1,372        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)   330 304          
TVN Voluntary Departure Plan [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring and Related Cost $ 13,100              
Harmonic 2017 Restructuring Plan [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges   2,500            
Payments for Restructuring   2,000            
Restructuring Reserve   500       $ 500    
Harmonic 2017 Restructuring Plan [Member] | Employee Severance [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges   2,100            
Harmonic 2017 Restructuring Plan [Member] | Facility Closing [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges   400            
Harmonic 2015 Restructuring [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring and Related Cost       $ 1,500 $ 2,200   $ 3,700  
Harmonic 2016 Restructuring Plan [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges     19,779          
Payments for Restructuring   11,065 7,507          
Restructuring Reserve 13,544 7,554 13,544     7,554    
Restructuring and Related Cost     20,000          
Adjustments to restructuring provisions   4,123 247          
Harmonic 2016 Restructuring Plan [Member] | Employee Severance [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges     4,702          
Payments for Restructuring   2,690 3,075          
Restructuring Reserve 1,519 0 1,519     0    
Adjustments to restructuring provisions   1,134 (88)          
Harmonic 2016 Restructuring Plan [Member] | Facility Closing [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges [3]     1,655          
Payments for Restructuring [3]   1,172 948          
Restructuring Reserve [3] 2,375 2,426 2,375     2,426    
Restructuring and Related Cost     2,200          
Adjustments to restructuring provisions [3]   1,223 582          
Harmonic 2016 Restructuring Plan [Member] | Severance [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring and Related Cost     $ 17,800          
Restructuring and Related Cost, Number of Positions Eliminated | Employees     118          
Harmonic 2016 Restructuring Plan [Member] | TVN Voluntary Departure Plan [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges     $ 13,175          
Payments for Restructuring   7,203 3,484          
Restructuring Reserve [3] $ 9,650 5,128 9,650     5,128    
Restructuring and Related Cost   1,100            
Adjustments to restructuring provisions   1,766 0          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)     $ 13,100          
Payments of Voluntary Plan Benefit Obligation           $ 10,700    
TVN [Member] | Cost of revenue [Member]                
Restructuring Cost and Reserve [Line Items]                
Gain From TVN Pension Curtailment   600            
TVN [Member] | Restructuring Charges [Member]                
Restructuring Cost and Reserve [Line Items]                
Gain From TVN Pension Curtailment   1,400            
TVN [Member] | Harmonic 2016 Restructuring Plan [Member] | Severance [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring and Related Cost, Number of Positions Eliminated | Employees     83          
San Jose CA Excess Facility [Member] | Harmonic 2016 Restructuring Plan [Member] | Facility Closing [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges     $ 1,400          
Adjustments to restructuring provisions   $ 1,200 $ 600          
Other Liabilities, Fair Value Disclosure               $ 2,500
Deferred Rent Credit               $ 1,100
[1] The restructuring and related charges for the year ended December 31, 2016 is net of $0.6 million and $1.4 million, in product cost of revenue and operating expenses-restructuring and related charges, respectively, of gain from TVN pension curtailment. See discussion below “Harmonic 2016 Restructuring Plan-TVN VDP” for additional information on the gain from TVN pension curtailment.
[2] As a result of the TVN VDP, the defined benefit pension plan was remeasured in the fourth quarter of 2016, which resulted in a non-cash curtailment gain of $2.0 million. The curtailment gain was recognized in the Consolidated Statement of Operations during the fourth quarter of 2016 and the Company’s pension liability was reduced by the same amount. Of the $2.0 million pension curtailment gain, $0.6 million is included in product cost of revenue and the remaining $1.4 million is included in operating expenses-restructuring and related charges in the Consolidated Statement of Operations. The remeasurement did not have a material effect on other components of net periodic pension expense for the year ended December 31, 2016.
[3] The current portion and long-term portion of the restructuring liability are reported under “Accrued and other current liabilities” and “Other non-current liabilities”, respectively, on the Company’s Consolidated Balance Sheets.