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Employee Benefit Plans - Summary of Restricted Stock Units Outstanding (Detail) (Restricted Stock Units Outstanding [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Apr. 03, 2015
Restricted Stock Units Outstanding [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares Underlying Restricted Stock Units | 2,359 hlit_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Weighted Average Remaining Vesting Period (Years) | 0 years 9 months 28 days
Aggregate Fair Value | $ 17,407 hlit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodAndExpectedToVestTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period And Expected To Vest Total Fair Value + References No definition available. + Details
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Namespace Prefix: | hlit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Vested And Expected To Vest Outstanding Number + References No definition available. + Details
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Namespace Prefix: | hlit_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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