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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (HFC business [Member], USD $) In Thousands, unless otherwise specified | 1 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 05, 2013 | Jun. 28, 2013
HFC business [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Business sold for cash agreed by the company | $ 46,000 | $ 46,000

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- Definition Discontinued Operation Gross Cash Proceeds Received From Sale Of Business + References No definition available. + Details
Name: | hlit_DiscontinuedOperationGrossCashProceedsReceivedFromSaleOfBusiness
Namespace Prefix: | hlit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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