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Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense of Purchased Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 03, 2015 | Dec. 31, 2014
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
2015 (remaining 9 months) | $ 4,595 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |
2016 | 4,097 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |
Total future amortization expense | 8,692 us-gaap_FiniteLivedIntangibleAssetsNet | 10,599 us-gaap_FiniteLivedIntangibleAssetsNet
Product cost of revenue [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
2015 (remaining 9 months) | 258 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CostOfSalesMember |
2016 | 0 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CostOfSalesMember |
Total future amortization expense | 258 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CostOfSalesMember |
Operating Expenses [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
2015 (remaining 9 months) | 4,337 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_OperatingExpensesMember |
2016 | 4,097 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_OperatingExpensesMember |
Total future amortization expense | $ 8,434 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hlit_OperatingExpensesMember |

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -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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