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Restructuring and Excess Facilities - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) Employees | Sep. 30, 2016 USD ($) | Jul. 01, 2016 USD ($) | Apr. 01, 2016 USD ($) | Dec. 31, 2016 USD ($) Employees Employee | Dec. 31, 2015 USD ($) Employees | Dec. 31, 2014 USD ($) Employee | Dec. 31, 2013 USD ($) Employee | Jan. 04, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost |  |  |  |  |  | $ 18,002 | [1] | $ 1,485 | $ 3,076 |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  |  |  | 1,955 |  |  |  |  |
Adjustments to restructuring provisions |  |  |  |  |  | 14,602 |  | 1,372 | 2,761 |  |
TVN Voluntary Departure Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost |  |  |  |  |  | $ 13,100 |  |  |  |  |
Number of employees applied for VDP | Employee |  |  |  |  |  | 83 |  |  |  |  |
Harmonic 2015 Restructuring [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost |  |  |  |  |  |  |  | 1,500 | 2,169 |  |
Restructuring charges |  |  |  |  |  |  |  | 1,617 | 2,169 |  |
Adjustments to restructuring provisions |  |  |  |  |  | $ (70) |  | $ (132) |  |  |
Harmonic 2015 Restructuring [Member] | Severance [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Number of Positions Eliminated | Employees |  |  |  |  |  |  |  | 56 |  |  |
Restructuring charges |  |  |  |  |  |  |  | $ 1,413 | 599 |  |
Adjustments to restructuring provisions |  |  |  |  |  | (70) |  | (126) |  |  |
Harmonic 2013 Restructuring [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost |  |  |  |  |  |  |  |  | 900 | $ 2,200 |
Restructuring charges |  |  |  |  |  |  |  | 924 | 2,168 |  |
Adjustments to restructuring provisions |  |  |  |  |  |  |  | (17) | $ 77 |  |
Harmonic 2013 Restructuring [Member] | Severance [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Number of Positions Eliminated | Employee |  |  |  |  |  |  |  |  | 25 | 85 |
Restructuring charges |  |  |  |  |  |  |  | 829 | $ 1,663 |  |
Adjustments to restructuring provisions |  |  |  |  |  |  |  | $ (17) | $ 29 |  |
Harmonic Two Thousand And Sixteen Restructuring [Member] | TVN Voluntary Departure Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost |  |  |  |  |  | 13,100 |  |  |  |  |
Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost |  |  |  |  |  | 20,000 |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  | $ 5,000 |  |  |  | 5,000 |  |  |  |  |
Anticipated Synergies from Restructuring Exit Plan |  | 20,000 |  |  |  | 20,000 |  |  |  |  |
Restructuring charges |  |  |  |  |  | 19,779 |  |  |  |  |
Adjustments to restructuring provisions |  |  |  |  |  | 247 |  |  |  |  |
Harmonic 2016 Restructuring Plan [Member] | Facility Closing [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost |  |  |  |  |  | 2,200 |  |  |  |  |
Restructuring charges | [2] |  |  |  |  | 1,655 |  |  |  |  |
Adjustments to restructuring provisions | [2] |  |  |  |  | 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 | [3] |  |  |  |  | $ 13,175 |  |  |  |  |
Adjustments to restructuring provisions | [3] |  |  |  |  | 0 |  |  |  |  |
TVN [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  |  |  | 2,000 |  |  |  |  |
Business Combination, Acquisition and Integration Related Expenses |  | $ 5,200 | $ 5,300 | $ 3,400 | $ 3,000 | 16,900 |  |  |  |  |
Number of employees applied for VDP | Employees |  | 83 |  |  |  |  |  |  |  |  |
Voluntary Departure Plan Anticipated Cost |  |  |  |  |  | $ 15,300 |  |  |  |  |
Voluntary Departure Plan Benefit Obligation Term |  |  |  |  |  | 4 years |  |  |  |  |
Fair value of TVN VDP at inception |  | $ 14,800 |  |  |  | $ 14,800 |  |  |  |  |
Number of employees required to work beyond minimum statutory notice period under VDP | Employees |  | 11 |  |  |  |  |  |  |  |  |
TVN [Member] | Cost of revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  |  |  | 600 |  |  |  |  |
TVN [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  |  |  | 1,400 |  |  |  |  |
TVN [Member] | TVN Voluntary Departure Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  | $ 13,100 |  |  |  |  |  |  |  |  |
Payments of Voluntary Plan Benefit Obligation |  |  |  |  |  | 3,500 |  |  |  |  |
Voluntary Departure Plan, Liability |  | 9,600 |  |  |  | $ 9,600 |  |  |  |  |
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 |  |  |  |  |
Other Liabilities, Fair Value Disclosure |  |  |  |  |  |  |  |  |  |  | $ 2,500
Deferred Rent Credit |  |  |  |  |  |  |  |  |  |  | $ 1,100
Adjustments to restructuring provisions |  | $ 600 |  |  |  |  |  |  |  |  |
Paris France Excess Facility [Member] | Harmonic 2016 Restructuring Plan [Member] | Facility Closing [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 200 |  |  |  |  |
[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 Note 13, “Employee Benefit Plans and Stock-based Compensation-TVN Retirement Benefit Plan,” for additional information on gain from TVN pension curtailment.
[2] | In December 2016, the Company also exited from an excess facility at its office in Paris, France and recorded $0.2 million of facility exit costs. This liability will be fully paid in the first quarter of 2017.
[3] | See discussion on TVN VDP above for future estimated payments under the TVN VDP through 2020.

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