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Restructuring and Excess Facilities - 2015 Activities in Restructuring Accrual (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Restructuring Cost and Reserve [Line Items] |  |  |
Adjustments to restructuring provisions | $ 14,602 | $ 1,372 | $ 2,761
Harmonic 2015 Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 264 | 322 |
Business Exit Costs |  | 1,617 | 2,169
Adjustments to restructuring provisions | (70) | (132) |
Cash payments | (194) | (1,341) | (601)
Non-cash write-offs |  | (202) | (1,246)
Ending Balance | 0 | 264 | 322
Harmonic 2015 Restructuring [Member] | Termination of an information technology (IT) project |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 0 | 0 |
Business Exit Costs |  | 0 | 1,138
Adjustments to restructuring provisions | 0 | 0 |
Cash payments | 0 | 0 | 0
Non-cash write-offs |  | 0 | (1,138)
Ending Balance | 0 | 0 | 0
Harmonic 2015 Restructuring [Member] | Severance and benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 264 | 305 |
Business Exit Costs |  | 1,413 | 599
Adjustments to restructuring provisions | (70) | (126) |
Cash payments | (194) | (1,328) | (294)
Non-cash write-offs |  | 0 | 0
Ending Balance | 0 | 264 | 305
Harmonic 2015 Restructuring [Member] | Termination of a research and development project |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 0 | 0 |
Business Exit Costs |  | 0 | 307
Adjustments to restructuring provisions | 0 | 0 |
Cash payments | 0 | 0 | (307)
Non-cash write-offs |  | 0 | 0
Ending Balance | 0 | 0 | 0
Harmonic 2015 Restructuring [Member] | Other charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 0 | 17 |
Business Exit Costs |  | 204 | 125
Adjustments to restructuring provisions |  | (6) |
Cash payments |  | (13) | 0
Non-cash write-offs |  | (202) | (108)
Ending Balance | $ 0 | $ 0 | $ 17

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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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