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Goodwill and Identified Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Apr. 03, 2015
Goodwill [Line Items] |
Balance at beginning of period | $ 197,884 us-gaap_Goodwill
Foreign currency translation adjustment | (108)us-gaap_GoodwillTranslationAdjustments
Balance at end of period | 197,776 us-gaap_Goodwill
Video [Member] |
Goodwill [Line Items] |
Balance at beginning of period | 136,975 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = hlit_VideoMember
Foreign currency translation adjustment | (75)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = hlit_VideoMember
Balance at end of period | 136,900 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = hlit_VideoMember
Cable Edge [Member] |
Goodwill [Line Items] |
Balance at beginning of period | 60,909 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = hlit_CableEdgeMember
Foreign currency translation adjustment | (33)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = hlit_CableEdgeMember
Balance at end of period | $ 60,876 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = hlit_CableEdgeMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillTranslationAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hlit_CableEdgeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hlit_VideoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |