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Legal Proceedings - Additional Information (Detail) (Avid Technology Inc. [Member])
Oct. 31, 2011
Patents
Jun. 29, 2012
Patents
Media grid [Member]    
Loss Contingencies [Line Items]    
Infringements of number of patents held 2hlit_NumberOfPatentInfringements
/ us-gaap_LitigationCaseAxis
= hlit_AvidTechnologyInc.Member
/ us-gaap_ProductOrServiceAxis
= hlit_MediagridMember		  
Spectrum [Member]    
Loss Contingencies [Line Items]    
Infringements of number of patents held   1hlit_NumberOfPatentInfringements
/ us-gaap_LitigationCaseAxis
= hlit_AvidTechnologyInc.Member
/ us-gaap_ProductOrServiceAxis
= hlit_SpectrumMember