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Short-Term Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013
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Investments, Debt and Equity Securities [Abstract] |
Available-for-sale securities in material unrealized loss position | $ 0

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- Definition Available For Sale Securities In A Material Unrealized Loss Position + References No definition available. + Details
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Namespace Prefix: | hlit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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