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Segment Information - Reconciliation of Segment Operating Income to Consolidated Income Before Income Taxes (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 26, 2014
Jun. 27, 2014
Mar. 28, 2014
Dec. 31, 2013
Sep. 27, 2013
Jun. 28, 2013
Mar. 29, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Net revenue, total $ 107,875,000us-gaap_SalesRevenueNet [1] $ 108,061,000us-gaap_SalesRevenueNet [1],[2] $ 109,589,000us-gaap_SalesRevenueNet [1] $ 108,032,000us-gaap_SalesRevenueNet $ 120,222,000us-gaap_SalesRevenueNet $ 122,918,000us-gaap_SalesRevenueNet [2] $ 117,128,000us-gaap_SalesRevenueNet $ 101,672,000us-gaap_SalesRevenueNet $ 433,557,000us-gaap_SalesRevenueNet $ 461,940,000us-gaap_SalesRevenueNet $ 476,871,000us-gaap_SalesRevenueNet
Operating Expenses                 (233,919,000)us-gaap_OperatingExpenses (243,469,000)us-gaap_OperatingExpenses (238,449,000)us-gaap_OperatingExpenses
Allocated Share-based Compensation Expense                 (17,287,000)us-gaap_AllocatedShareBasedCompensationExpense (16,002,000)us-gaap_AllocatedShareBasedCompensationExpense (18,428,000)us-gaap_AllocatedShareBasedCompensationExpense
Amortization of Intangible Assets                 (20,520,000)us-gaap_AmortizationOfIntangibleAssets (27,329,000)us-gaap_AmortizationOfIntangibleAssets (29,204,000)us-gaap_AmortizationOfIntangibleAssets
Operating Income (Loss)                 (21,571,000)us-gaap_OperatingIncomeLoss (23,024,000)us-gaap_OperatingIncomeLoss (17,917,000)us-gaap_OperatingIncomeLoss
Nonoperating Income (Expense)                 (224,000)us-gaap_NonoperatingIncomeExpense (128,000)us-gaap_NonoperatingIncomeExpense 222,000us-gaap_NonoperatingIncomeExpense
Loss from continuing operations before income taxes                 (21,795,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (23,152,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (17,695,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Video [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Net revenue, total                 326,756,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= hlit_VideoMember		 381,994,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= hlit_VideoMember		 378,383,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= hlit_VideoMember
Cable Edge [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Net revenue, total                 106,801,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= hlit_CableEdgeMember		 79,946,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= hlit_CableEdgeMember		 98,488,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= hlit_CableEdgeMember
Operating Segments [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Operating Income (Loss)                 19,312,000us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 23,301,000us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 29,715,000us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Operating Segments [Member] | Video [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Operating Income (Loss)                 18,073,000us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= hlit_VideoMember		 24,583,000us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= hlit_VideoMember		 27,565,000us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= hlit_VideoMember
Operating Segments [Member] | Cable Edge [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Operating Income (Loss)                 1,239,000us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= hlit_CableEdgeMember		 (1,282,000)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= hlit_CableEdgeMember		 2,150,000us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= hlit_CableEdgeMember
Corporate, Non-Segment [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Operating Expenses                 $ (3,076,000)us-gaap_OperatingExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember		 $ (2,994,000)us-gaap_OperatingExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember		 $ 0us-gaap_OperatingExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
[1] A history of operating losses in recent years has led to uncertainty with respect to the Company’s ability to realize certain net deferred tax assets, and as a result, the Company recorded increased valuation allowances of $24.5 million, $4.2 million and $0.3 million, in the second, third and fourth quarters of fiscal 2014, respectively, against its U.S. net deferred tax assets.
[2] As a result of the expiration of the applicable statute of limitations relating to the tax audits in the U.S. for years 2008 through 2010, the Company recorded tax benefits of $9.0 million and $39.0 million, in the third quarter of fiscal 2014 and 2013, respectively.