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Segment Information (Revenues By Client Services) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue from External Customer [Line Items]    
Revenues $ 355,246us-gaap_SalesRevenueServicesNet $ 312,165us-gaap_SalesRevenueServicesNet
Housekeeping Services [Member]    
Revenue from External Customer [Line Items]    
Revenues 156,587us-gaap_SalesRevenueServicesNet
/ us-gaap_ProductOrServiceAxis
= hcsg_HousekeepingServicesMember		 140,940us-gaap_SalesRevenueServicesNet
/ us-gaap_ProductOrServiceAxis
= hcsg_HousekeepingServicesMember
Laundry and Linen Services [Member]    
Revenue from External Customer [Line Items]    
Revenues 69,488us-gaap_SalesRevenueServicesNet
/ us-gaap_ProductOrServiceAxis
= hcsg_LaundryAndLinenServicesMember		 63,270us-gaap_SalesRevenueServicesNet
/ us-gaap_ProductOrServiceAxis
= hcsg_LaundryAndLinenServicesMember
Dietary Services [Member]    
Revenue from External Customer [Line Items]    
Revenues 128,665us-gaap_SalesRevenueServicesNet
/ us-gaap_ProductOrServiceAxis
= hcsg_DietaryServicesMember		 107,424us-gaap_SalesRevenueServicesNet
/ us-gaap_ProductOrServiceAxis
= hcsg_DietaryServicesMember
Maintenance Services and Other [Member]    
Revenue from External Customer [Line Items]    
Revenues $ 506us-gaap_SalesRevenueServicesNet
/ us-gaap_ProductOrServiceAxis
= hcsg_MaintenanceServicesAndOtherMember		 $ 531us-gaap_SalesRevenueServicesNet
/ us-gaap_ProductOrServiceAxis
= hcsg_MaintenanceServicesAndOtherMember