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Restructuring and Related Charges - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2016 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) Employees | Jul. 01, 2016 USD ($) | Jun. 30, 2017 USD ($) Employee | Jul. 01, 2016 USD ($) | Dec. 31, 2016 USD ($) Employees | Jun. 30, 2017 USD ($) | Jan. 04, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Incurred Cost |  |  | $ 1,055 |  | $ 1,909 | $ 2,842 | $ 4,492 |  |  |
Adjustments to restructuring provisions |  |  | 777 |  | 1,903 | 2,056 | 4,515 |  |  |
Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Incurred Cost |  |  |  |  |  |  |  | $ 20,000 |  |
Charges for 2016 Harmonic Restructuring Plan |  |  |  |  |  | 2,798 |  |  |  |
Adjustments to restructuring provisions |  |  |  |  |  | 44 |  |  |  |
Facility Closing [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Incurred Cost |  |  |  |  |  |  |  | 2,200 |  |
Charges for 2016 Harmonic Restructuring Plan |  |  |  |  |  | 48 |  |  |  |
Adjustments to restructuring provisions |  |  |  |  |  |  |  |  |  |
Employee Severance And Benefit Arrangements [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Incurred Cost |  |  |  |  |  |  |  | $ 17,800 |  |
Number of positions eliminated | Employees |  |  |  |  |  |  |  | 118 |  |
Employee Severance [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Charges for 2016 Harmonic Restructuring Plan | [1] |  |  |  |  | 973 |  |  |  |
Adjustments to restructuring provisions | [1] |  |  |  |  | 44 |  |  |  |
TVN Voluntary Departure Plan [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Charges for 2016 Harmonic Restructuring Plan | [2] |  |  |  |  | 1,777 |  |  |  |
Adjustments to restructuring provisions | [2] |  |  |  |  |  |  |  |  |
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 |  |  |  |  | 6,500 |  | 6,500 | 16,900 |  |
Business Combination, Integration Related Costs |  |  | 467 |  | $ 2,518 | $ 2,617 | $ 3,178 |  |  |
Number of employees applied for VDP | Employees |  |  |  | 83 |  |  |  |  |  |
Voluntary Departure Plan Anticipated Cost |  |  |  |  |  |  |  | $ 15,300 |  |
Voluntary Departure Plan Benefit Obligation Term |  |  |  |  |  |  |  | 4 years |  |
Number of employees required to work beyond minimum statutory notice period under VDP | Employees |  |  |  | 11 |  |  |  |  |  |
Accrued Voluntary Departure Plan, Current |  |  |  | $ 14,800 |  |  |  | $ 14,800 |  |
TVN [Member] | Employee Severance And Benefit Arrangements [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Number of positions eliminated |  |  |  |  |  | 21 |  | 83 |  |
TVN [Member] | Employee Severance [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Postemployment Benefits, Period Expense |  |  | 700 |  |  | $ 1,800 |  |  |  |
Charges for 2016 Harmonic Restructuring Plan |  |  | 400 |  |  | 1,000 |  |  |  |
TVN [Member] | TVN Voluntary Departure Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Charges for 2016 Harmonic Restructuring Plan |  |  |  |  |  | 1,800 |  | $ 13,100 |  |
Defined Benefit Plan, Benefits Paid |  |  |  |  |  | 4,900 |  | $ 3,500 | $ 8,400 |
Postemployment Benefits Liability |  |  | $ 7,200 |  |  | $ 7,200 |  |  | $ 7,200 |
San Jose CA Excess Facility [Member] | Facility Closing [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Charges for 2016 Harmonic Restructuring Plan |  | $ 1,400 |  |  |  |  |  |  |  |
Fair Value of Excess Facility Restructuring |  |  |  |  |  |  |  |  |  | $ 2,500
Deferred Rent Credit |  |  |  |  |  |  |  |  |  | $ 1,100
Adjustments to restructuring provisions |  |  |  | $ 600 |  |  |  |  |  |
[1] | The Company anticipates that the remaining severance and benefits accrual at June 30, 2017 will be fully paid in 2017.
[2] | See discussion of the TVN VDP above for future estimated payments through 2020.

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