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Restructuring and Related Charges - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) | Jan. 31, 2016 USD ($) | Sep. 28, 2018 USD ($) | Sep. 29, 2017 USD ($) | Sep. 28, 2018 USD ($) Employees | Sep. 29, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Employees | Aug. 01, 2018 USD ($) | Jan. 04, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  | $ 6,365 |  | $ 6,365 |  | $ 8,043 |  |  |
Restructuring Reserve, Current |  |  | 3,800 |  | 3,800 |  | 4,400 |  |  |
Restructuring Reserve, Noncurrent |  |  | 2,600 |  | 2,600 |  | 3,600 |  |  |
Restructuring and related charges |  |  | 987 | $ 2,028 | 2,704 | $ 4,084 |  |  |  |
Restructuring charges |  |  |  |  | 3,056 |  |  |  |  |
Payments for Restructuring |  |  |  |  | 5,517 |  |  |  |  |
Adjustments to restructuring liability |  |  |  |  | 532 |  |  |  |  |
Harmonic 2017 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 2,500 |  |  |
Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring and related charges |  |  |  |  |  |  |  | $ 20,000 |  |
Facility Closing [Member] | Harmonic 2018 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  | 1,214 |  | 1,214 |  |  |  |  |
Restructuring charges |  |  |  |  | 932 |  |  |  |  |
Payments for Restructuring |  |  |  |  | 51 |  |  |  |  |
Adjustments to restructuring liability |  |  |  |  | 1 |  |  |  |  |
Facility Closing [Member] | Harmonic 2017 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  | 187 |  | 187 |  | 296 |  |  |
Restructuring Reserve, Noncurrent |  |  | 200 |  | 200 |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 400 |  |  |
Payments for Restructuring |  |  |  |  | 109 |  |  |  |  |
Facility Closing [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  | 1,770 |  | 1,770 |  | 2,426 |  |  |
Restructuring and related charges |  |  |  |  |  |  |  | 2,200 |  |
Payments for Restructuring |  |  |  |  | 755 |  |  |  |  |
Adjustments to restructuring liability |  |  |  |  | 99 |  |  |  |  |
Employee Severance And Benefit Arrangements [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring and related charges |  |  |  |  |  |  |  | $ 17,800 |  |
Number of positions eliminated | Employees |  |  |  |  |  |  |  | 118 |  |
Employee Severance [Member] | Harmonic 2018 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  | 6 |  | 6 |  |  |  |  |
Restructuring charges |  |  |  |  | $ 2,124 |  |  |  |  |
Number of positions eliminated | Employees |  |  |  |  | 59 |  |  |  |  |
Payments for Restructuring |  |  |  |  | $ 2,046 |  |  |  |  |
Adjustments to restructuring liability |  |  |  |  | (72) |  |  |  |  |
Employee Severance [Member] | Harmonic 2017 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  | 0 |  | 0 |  | 193 |  |  |
Restructuring charges |  |  |  |  |  |  | 2,100 |  |  |
Payments for Restructuring |  |  |  |  | 193 |  |  |  |  |
TVN Voluntary Departure Plan [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  | 3,188 |  | 3,188 |  | 5,128 |  |  |
Payments for Restructuring |  |  |  |  | 2,363 |  |  |  |  |
Adjustments to restructuring liability |  |  |  |  | 504 |  |  |  |  |
TVN [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment |  |  |  |  |  |  |  | $ 2,000 |  |
Postemployment Benefits Liability |  |  | 3,200 |  | 3,200 |  | 5,100 |  |  |
TVN [Member] | Employee Severance And Benefit Arrangements [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Number of positions eliminated | Employees |  |  |  |  |  |  |  | 83 |  |
TVN [Member] | TVN Voluntary Departure Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  | 500 | $ 1,800 |  |  |  |
Postemployment Benefits Liability |  |  | $ 3,200 |  | $ 3,200 |  |  |  |  |
San Jose CA Excess Facility [Member] | Facility Closing [Member] | Harmonic 2018 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges | $ 900 |  |  |  |  |  |  |  |  |
San Jose CA Excess Facility [Member] | Facility Closing [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  | $ 1,400 |  |  |  |  |  |  |  |
Fair Value of Excess Facility Restructuring |  |  |  |  |  |  |  |  | $ 1,200 | $ 2,500
Deferred Rent Credit |  |  |  |  |  |  |  |  | $ 300 | $ 1,100
Adjustments to restructuring liability |  |  |  |  |  |  | $ 1,200 |  |  |

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