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Fair Value Measurements (Contractual Maturities of Available for Sale Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total debt securities $ 11,799us-gaap_MarketableSecurities  
Municipal Bonds — Available for Sale    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Maturing in one year or less 4,343us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_AvailableforsaleSecuritiesMember		 1,846us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_AvailableforsaleSecuritiesMember
Maturing after one year through three years 4,041hcsg_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_AvailableforsaleSecuritiesMember		 7,113hcsg_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_AvailableforsaleSecuritiesMember
Maturing after three years 3,415hcsg_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_AvailableforsaleSecuritiesMember		 2,486hcsg_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_AvailableforsaleSecuritiesMember
Total debt securities $ 11,799us-gaap_MarketableSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_AvailableforsaleSecuritiesMember		 $ 11,445us-gaap_MarketableSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_AvailableforsaleSecuritiesMember