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Segment Information Schedule of Net Revenues by Segment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Net Revenue $ 61,121us-gaap_Revenues $ 48,207us-gaap_Revenues
Server OEMs [Member]    
Segment Reporting Information [Line Items]    
Net Revenue 25,178us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= hill_ServerOEMsMember		 25,854us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= hill_ServerOEMsMember
Vertical Markets [Member]    
Segment Reporting Information [Line Items]    
Net Revenue 35,943us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= hill_VerticalMarketsMember		 22,353us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= hill_VerticalMarketsMember
Corporate Segment [Member]    
Segment Reporting Information [Line Items]    
Net Revenue $ 0us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 $ 0us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember