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Credit Facilities - Additional Information (Detail) (JPMorgan Chase [Member], USD $)
 3 Months Ended
Apr. 03, 2015
Dec. 22, 2014
Commercial Letters of Credit [Member] | Maximum [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Commitment Fee Percentage 0.75%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= hlit_CommercialLettersofCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Line of Credit Facility, Commitment Fee Amount $ 100us-gaap_LineOfCreditFacilityCommitmentFeeAmount
/ us-gaap_CreditFacilityAxis
= hlit_CommercialLettersofCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Revolving Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Percentage of Equity Interest Pledged as Collateral for Letter of Credit 66.67%hlit_PercentageofEquityInterestPledgedasCollateralforLetterofCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember		  
Line of Credit Facility, Current Borrowing Capacity   20,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember
Line of Credit Facility, Remaining Borrowing Capacity 19,800,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember		  
Borrowings under bank line of credit facility 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember		  
Credit facility collateral Obligations under the Credit Agreement are secured only by a pledge of 66 2/3% of the Company’s equity interests in its foreign subsidiary, Harmonic International AG. Additionally, to the extent that the Company in the future forms any direct or indirect, domestic, material subsidiaries, those subsidiaries will be required to provide a guaranty of the Company’s obligations under the Credit Agreement.  
Line of Credit Facility, Threshold Consecutive Business Days 5 days  
Debt Instrument, Fee Amount 50,000us-gaap_DebtInstrumentFeeAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember		  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember		  
Line of Credit, Covenant, Consolidated Cash and Marketable Securities Minimum 35,000,000hlit_LineofCreditCovenantConsolidatedCashandMarketableSecuritiesMinimum
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember		  
Line of Credit Covenant, EBITDA, Minimum 20,000,000hlit_LineofCreditCovenantEBITDAMinimum
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember		  
Revolving Credit Facility [Member] | Minimum [Member]
    
Line of Credit Facility [Line Items]    
Consolidated Cash Threshold 30,000,000hlit_ConsolidatedCashThreshold
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Standby letters of credit [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity   10,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember
Line of Credit Facility, Remaining Borrowing Capacity $ 200,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember		  
Line of Credit Facility, Commitment Fee Percentage 1.75%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember		  
LIBOR [Member] | Revolving Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
LIBOR rate duration LIBOR  
Adjusted LIBOR Rate, Variable Rate, Period End Month One 1 month  
Adjusted LIBOR Rate, Variable Rate, Period End Month Two 2 months  
Adjusted LIBOR Rate, Variable Rate, Period End Month Three 3 months  
LIBOR [Member] | Revolving Credit Facility [Member] | Minimum [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit LIBOR margin 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		  
Adjusted LIBOR Rate Applicable Margin Rate [Member] | Revolving Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit LIBOR margin 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember
/ us-gaap_VariableRateAxis
= hlit_AdjustedLIBORRateApplicableMarginRateMember		  
Prime Rate [Member] | Revolving Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
LIBOR rate duration prime  
Adjusted Prime Rate Applicable Margin Rate [Member] | Revolving Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit LIBOR margin (1.30%)us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= hlit_JPMorganChaseMember
/ us-gaap_VariableRateAxis
= hlit_AdjustedPrimeRateApplicableMarginRateMember