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Segment Information (Revenues By Client Services) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue from External Customer [Line Items] |  |  |
Revenues | $ 1,293,183 us-gaap_SalesRevenueServicesNet | $ 1,149,890 us-gaap_SalesRevenueServicesNet | $ 1,077,435 us-gaap_SalesRevenueServicesNet
Housekeeping Services [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues | 589,820 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = hcsg_HousekeepingServicesMember | 514,180 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = hcsg_HousekeepingServicesMember | 492,319 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = hcsg_HousekeepingServicesMember
Laundry and Linen Services [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues | 254,777 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = hcsg_LaundryAndLinenServicesMember | 241,540 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = hcsg_LaundryAndLinenServicesMember | 240,670 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = hcsg_LaundryAndLinenServicesMember
Dietary Services [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues | 446,573 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = hcsg_DietaryServicesMember | 390,797 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = hcsg_DietaryServicesMember | 339,867 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = hcsg_DietaryServicesMember
Maintenance Services and Other [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues | $ 2,013 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = hcsg_MaintenanceServicesAndOtherMember | $ 3,373 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = hcsg_MaintenanceServicesAndOtherMember | $ 4,579 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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