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Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], Dutch Auction [Member], USD $) In Millions, except Per Share data, unless otherwise specified | 1 Months Ended
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Apr. 22, 2013
Subsequent Event [Line Items] |
Tender offer to purchase common stock | $ 100
Commencement date of tender offer | April 26, 2013
Expiry date of tender offer | May 24, 2013
Percentage of common shares outstanding | 14.10%
Minimum [Member] |
Subsequent Event [Line Items] |
Sale of common stock price per share | $ 5.75
Maximum [Member] |
Subsequent Event [Line Items] |
Sale of common stock price per share | $ 6.25

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- Definition Amount Of Purchase Of Common Stock Under Tender Offer + 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 Common Stock Repurchase Program Expiry Date + References No definition available. + Details
Name: | hlit_CommonStockRepurchaseProgramExpiryDate
Namespace Prefix: | hlit_
Data Type: | invest:dateStringItemType
Balance Type: | na
Period Type: | instant

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- Definition Common Stock Shares Outstanding Percentage + References No definition available. + Details
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Namespace Prefix: | hlit_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Stock Repurchase Program Commencement Date + References No definition available. + Details
Name: | hlit_StockRepurchaseProgramCommencementDate
Namespace Prefix: | hlit_
Data Type: | us-types:dateStringItemType
Balance Type: | na
Period Type: | instant

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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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