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Restructuring and Related Charges - Activities in Restructuring Accrual (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Oct. 02, 2015 | Sep. 30, 2016 | Oct. 02, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Product cost of revenue |  | $ 113 |  | $ 113 |  |
Production Related Impairment Cost Recovery | $ (1) |  | $ (24) |  |  |
Adjustments to restructuring provisions | (27) | 397 | 4,488 | 626 |  |
Restructuring and Related Cost, Incurred Cost | (28) | 510 | 4,464 | 739 |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Adjustments to restructuring provisions | (27) | $ 397 | 4,488 | $ 626 |  |
Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Adjustments to restructuring provisions |  |  | (87) |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  | 4,862 |  |  |
Adjustments to restructuring provisions |  |  | (87) |  |  |
Reclassification of deferred rent |  |  | 1,087 |  |  |
Cash payments |  |  | (3,766) |  |  |
Non-cash write-offs |  |  | (246) |  |  |
Foreign exchange gain (loss) |  |  | (12) |  |  |
Ending Balance | 1,838 |  | 1,838 |  |  |
Harmonic 2016 Restructuring Plan [Member] | Other Restructuring [Member] |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  | 246 |  |  |
Reclassification of deferred rent |  |  | 0 |  |  |
Cash payments |  |  | 0 |  |  |
Non-cash write-offs |  |  | (246) |  |  |
Ending Balance | 0 |  | 0 |  |  |
Increase (Decrease) in Restructuring Reserve |  |  | 0 |  |  |
Harmonic 2016 Restructuring Plan [Member] | Facility Closing [Member] |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges | 1,400 |  | 1,445 |  |  |
Reclassification of deferred rent |  |  | 1,087 |  |  |
Cash payments |  |  | (705) |  |  |
Non-cash write-offs |  |  | 0 |  |  |
Ending Balance | 1,827 |  | 1,827 |  |  |
Increase (Decrease) in Restructuring Reserve |  |  | 0 |  |  |
Harmonic 2016 Restructuring Plan [Member] | Employee Severance [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Adjustments to restructuring provisions |  |  | (87) |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  | 3,171 |  |  |
Adjustments to restructuring provisions |  |  | (87) |  |  |
Reclassification of deferred rent |  |  | 0 |  |  |
Cash payments |  |  | (3,061) |  |  |
Non-cash write-offs |  |  | 0 |  |  |
Foreign exchange gain (loss) |  |  | (12) |  |  |
Ending Balance | 11 |  | 11 |  |  |
Harmonic Two Thousand And Fifteen Restructuring [Member] |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  |  |  | $ 1,500 | $ 2,200
Harmonic Two Thousand And Fifteen Restructuring [Member] | Employee Severance [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Adjustments to restructuring provisions |  |  | (65) |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  | 264 |  |  |
Adjustments to restructuring provisions |  |  | (65) |  |  |
Cash payments |  |  | (194) |  |  |
Ending Balance | $ 5 |  | $ 5 |  | $ 264 |

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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 The increase (decrease) during the period in the carrying amount (including both current and noncurrent portions of the accrual) of the liability pertaining to the exit from or disposal of business activities or restructuring pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination and to asset retirement obligations. + References No definition available. + 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 Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + 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)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + 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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