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Goodwill and Identified Intangible Assets - Summary of Goodwill and Identified Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
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Apr. 03, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 210,343 us-gaap_FiniteLivedIntangibleAssetsGross | $ 210,343 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization | (201,651)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (199,744)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Total future amortization expense | 8,692 us-gaap_FiniteLivedIntangibleAssetsNet | 10,599 us-gaap_FiniteLivedIntangibleAssetsNet
Developed core technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 136,145 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_DevelopedCoreTechnologyMember | 136,145 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_DevelopedCoreTechnologyMember
Accumulated Amortization | (135,887)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_DevelopedCoreTechnologyMember | (135,426)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_DevelopedCoreTechnologyMember
Total future amortization expense | 258 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_DevelopedCoreTechnologyMember | 719 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_DevelopedCoreTechnologyMember
Developed core technology [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 4 years |
Developed core technology [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 6 years |
Customer relationships/contracts [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 67,098 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_CustomerRelationshipsContractsMember | 67,098 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_CustomerRelationshipsContractsMember
Accumulated Amortization | (60,001)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_CustomerRelationshipsContractsMember | (58,784)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_CustomerRelationshipsContractsMember
Total future amortization expense | 7,097 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_CustomerRelationshipsContractsMember | 8,314 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_CustomerRelationshipsContractsMember
Customer relationships/contracts [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 5 years |
Customer relationships/contracts [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 6 years |
Maintenance agreements and related relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 7,100 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_MaintenanceAgreementsAndRelatedRelationshipsMember | 7,100 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_MaintenanceAgreementsAndRelatedRelationshipsMember
Accumulated Amortization | (5,763)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_MaintenanceAgreementsAndRelatedRelationshipsMember | (5,534)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_MaintenanceAgreementsAndRelatedRelationshipsMember
Total future amortization expense | 1,337 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_MaintenanceAgreementsAndRelatedRelationshipsMember | $ 1,566 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_MaintenanceAgreementsAndRelatedRelationshipsMember
Maintenance agreements and related relationships [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 6 years |
Maintenance agreements and related relationships [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 7 years |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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