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Restructuring and Related Charges - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) | Oct. 02, 2015 USD ($) | Sep. 30, 2016 USD ($) Employee | Oct. 02, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Employee | Dec. 31, 2014 USD ($) | Jan. 04, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and Related Cost, Incurred Cost | $ (28,000) | $ 510,000 | $ 4,464,000 | $ 739,000 |  |  |  |
Defined Benefit Pension Plan Liabilities, Current | 248,000 |  | 248,000 |  |  |  |  |
Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | 246,000 |  |  |  |  |
Charges for 2016 Harmonic Restructuring Plan |  |  | $ 4,862,000 |  |  |  |  |
Number of positions eliminated | Employee |  |  | 22 |  |  |  |  |
Harmonic Two Thousand And Fifteen Restructuring [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Charges for 2016 Harmonic Restructuring Plan |  |  |  |  |  | $ 1,500,000 | $ 2,200,000 |
Number of positions eliminated | Employee |  |  |  |  |  | 56 |  |
Facility Closing [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Fair Value of Excess Facility Restructuring |  |  |  |  |  |  |  | $ 2,500,000
Deferred Rent Credit |  |  |  |  |  |  |  | $ 1,100,000
Restructuring Reserve, Settled without Cash |  |  | $ 0 |  |  |  |  |
Restructuring Charges |  |  | 1,400,000 |  |  |  |  |
Charges for 2016 Harmonic Restructuring Plan | 1,400,000 |  | 1,445,000 |  |  |  |  |
Employee Severance [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | 0 |  |  |  |  |
Restructuring Charges |  |  | 3,100,000 |  |  |  |  |
Charges for 2016 Harmonic Restructuring Plan |  |  | 3,171,000 |  |  |  |  |
Other Restructuring [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | 246,000 |  |  |  |  |
Charges for 2016 Harmonic Restructuring Plan |  |  | 246,000 |  |  |  |  |
TVN [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Business Combination, Acquisition and Integration Related Expenses | 5,300,000 |  | 11,800,000 |  |  |  |  |
Business Combination, Integration Related Costs | 4,734,000 |  | 7,912,000 |  |  |  |  |
Business Combination, Acquisition Related Costs | 534,000 |  | 3,855,000 |  |  |  |  |
TVN [Member] | Operating Expense [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Business Combination, Integration Related Costs | 4,636,000 |  | 7,814,000 |  |  |  |  |
Business Combination, Acquisition Related Costs | 534,000 |  | 3,855,000 |  |  |  |  |
TVN [Member] | Employee Severance [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Defined Benefit Pension Plan Liabilities, Current | 11,000,000 |  | 11,000,000 |  |  |  |  |
TVN [Member] | Employee Severance [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Postemployment Benefits, Period Expense | 0 |  | 0 |  |  |  |  |
Scenario, Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  | $ 3,000,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Anticipated Synergies from Restructuring Exit Plan | 24,000,000 |  | 24,000,000 |  |  |  |  |
Minimum [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 31,000,000 |  | $ 31,000,000 |  |  |  |  |
Expected Project Completion Period |  |  | 12 months |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Anticipated Synergies from Restructuring Exit Plan | 25,000,000 |  | $ 25,000,000 |  |  |  |  |
Maximum [Member] | Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost | $ 33,000,000 |  | $ 33,000,000 |  |  |  |  |

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