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

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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