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Restructuring and Related Charges - Activities in Restructuring Accrual (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Apr. 01, 2016
Restructuring Reserve [Roll Forward] |  |  |
Adjustments to restructuring provisions |  | $ 1,279 | $ 2,612
Harmonic 2016 Restructuring Plan [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Beginning Balance |  | 13,544 |
Restructuring charges |  | 1,732 |
Adjustments to restructuring provisions |  | 55 |
Cash payments |  | (5,724) |
Foreign exchange gain (loss) |  | 145 |
Ending Balance |  | 9,752 |
Restructuring Reserve, Current | [1] | (5,777) |
Restructuring Reserve, Noncurrent | [1] | 3,975 |
Harmonic 2016 Restructuring Plan [Member] | Facility Closing [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Beginning Balance |  | 2,375 |
Restructuring charges |  | 25 |
Adjustments to restructuring provisions |  | 0 |
Cash payments |  | (433) |
Ending Balance |  | 1,967 |
Restructuring Reserve, Current | [1] | (978) |
Restructuring Reserve, Noncurrent | [1] | 989 |
Harmonic 2016 Restructuring Plan [Member] | TVN Voluntary Departure Plan [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Beginning Balance | [2] | 9,650 |
Restructuring charges | [2] | 1,077 |
Adjustments to restructuring provisions | [2] | 0 |
Cash payments | [2] | (3,627) |
Foreign exchange gain (loss) | [2] | 131 |
Ending Balance | [2] | 7,231 |
Restructuring Reserve, Current | [1],[2] | (4,245) |
Restructuring Reserve, Noncurrent | [1],[2] | 2,986 |
Harmonic 2016 Restructuring Plan [Member] | Employee Severance [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Beginning Balance | [3] | 1,519 |
Restructuring charges | [3] | 630 |
Adjustments to restructuring provisions | [3] | 55 |
Cash payments | [3] | (1,664) |
Foreign exchange gain (loss) | [3] | 14 |
Ending Balance | [3] | 554 |
Restructuring Reserve, Current | [1],[3] | (554) |
Restructuring Reserve, Noncurrent | [1],[3] | $ 0 |
[1] | The current portion and long-term portion of the restructuring liability are reported under “Accrued and other current liabilities” and “Other non-current liabilities”, respectively, on the Company’s Condensed Consolidated Balance Sheets.
[2] | See discussion of the TVN VDP above for future estimated payments through 2020.
[3] | The Company anticipates that the remaining severance and benefits accrual at March 31, 2017 will be fully paid in 2017.

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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://www.xbrl.org/2003/role/presentationRef -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=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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