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Restructuring and Related Charges - 2016 Activities in Restructuring Accrual (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2018 | Jun. 30, 2017 | Jun. 29, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Production Related Impairments or Charges |  | $ 115 | $ 278 | $ 877 | $ 786 |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  |  | 8,000 |  |
Restructuring and related charges |  | 631 | $ 777 | 1,717 | $ 2,056 |
Ending Balance |  | 6,100 |  | 8,000 |  | $ 8,000
Restructuring Reserve, Current |  | (3,500) |  |  |  | (4,400)
Restructuring Reserve, Noncurrent |  | 2,600 |  |  |  | 3,600
Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  |  | 7,554 |  |
Restructuring and related charges |  |  |  | 543 |  |
Cash payments |  |  |  | (2,155) |  |
Foreign exchange gain (loss) |  |  |  | (107) |  |
Ending Balance |  | 5,835 |  | 7,554 |  | 7,554
Restructuring Reserve, Current | [1] | (3,346) |  |  |  |
Restructuring Reserve, Noncurrent | [1] | 2,489 |  |  |  |
Harmonic 2016 Restructuring Plan [Member] | Facility Closing [Member] |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  |  | 2,426 |  |
Restructuring and related charges |  |  |  | 66 |  |
Cash payments |  |  |  | (502) |  |
Ending Balance |  | 1,990 |  | 2,426 |  | 2,426
Restructuring Reserve, Current | [1] | (900) |  |  |  |
Restructuring Reserve, Noncurrent | [1] | 1,090 |  |  |  |
Harmonic 2016 Restructuring Plan [Member] | TVN Voluntary Departure Plan [Member] |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  |  | 5,128 |  |
Restructuring and related charges |  |  |  | 477 |  |
Cash payments |  |  |  | (1,653) |  |
Foreign exchange gain (loss) |  |  |  | (107) |  |
Ending Balance |  | 3,845 |  | $ 5,128 |  | $ 5,128
Restructuring Reserve, Current | [1] | (2,446) |  |  |  |
Restructuring Reserve, Noncurrent | [1] | $ 1,399 |  |  |  |
[1] | The current portion and long-term portion of the restructuring liability are reported as components of “Accrued and other current liabilities” and “Other non-current liabilities”, respectively, on the Company’s Condensed Consolidated Balance Sheets.

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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=98514028&loc=d3e3536-108585 + Details
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- Definition Nonrecurring impairment charges related to the write-off of production-related equipment and inventory. This tag is used when an Entity charges this cost to cost of goods sold. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + 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 Amount of increase (decrease) in the restructuring reserve related to foreign currency translation (gain) loss and other increases (decreases). + 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 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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