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Restructuring and Related Charges - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 28, 2019 | Jun. 29, 2018 | Jun. 28, 2019 | Jun. 29, 2018 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | $ 76 | $ 82 | $ 153 | $ 164 |
Restructuring charges |  |  |  | 701 |  |
Payments for Restructuring |  |  |  | 2,218 |  |
Restructuring Reserve |  | 3,436 |  | 3,436 |  | $ 5,335
Adjustments to restructuring liability |  |  |  | (24) |  |
Restructuring Reserve, Current |  | 3,100 |  | 3,100 |  | 3,300
Restructuring Reserve, Noncurrent |  | 300 |  | 300 |  | 2,000
Facility Closing [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Payments for Restructuring |  |  |  | 955 |  |
Restructuring Reserve |  | 1,636 |  | 1,636 |  | 2,926
Adjustments to restructuring liability |  |  |  | (47) |  |
Facility Closing [Member] | Harmonic 2017 Restructuring Plan [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Adjustments to restructuring liability |  |  |  |  |  | 200
Facility Closing [Member] | Prior Restructuring Plans [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve |  | 3,000 |  | 3,000 |  |
Employee Severance [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  | 433 |  |
Payments for Restructuring |  |  |  | 284 |  |
Restructuring Reserve |  | 149 |  | 149 |  | 0
Employee Severance [Member] | Harmonic 2019 Restructuring Plan [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  | 100 |  | 400 |  |
Payments for Restructuring |  |  |  | 300 |  |
Restructuring Reserve |  | 100 |  | 100 |  |
TVN Voluntary Departure Plan [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | [1] |  |  | 27 |  |
Payments for Restructuring | [1] |  |  | 979 |  |
Restructuring Reserve | [1] | 1,410 |  | 1,410 |  | 2,409
Adjustments to restructuring liability | [1] |  |  | 23 |  |
TVN [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  |  |  |  | $ 500 |
Postemployment Benefits Liability |  | $ 1,400 |  | $ 1,400 |  | $ 2,400
[1] | “TVN VDP” consists of restructuring-related costs in connection with the TVN acquisition that included global workforce reductions, exiting certain operating facilities and disposing of excess assets and an employee voluntary departure plan in France.

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 + Details
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