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Segment Information (Schedule Of Information Of Reportable Segments) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 segment | Mar. 31, 2014
Segment Reporting [Abstract] |  |  |  |
Number of reportable segments | 2 us-gaap_NumberOfReportableSegments |  |  |
Percentage of revenue and income earned in one geographic segment | 99.00%hcsg_PercentageOfRevenueAndIncomeEarnedInOneGeographicSegment |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 355,246 us-gaap_SalesRevenueServicesNet |  | $ 312,165 us-gaap_SalesRevenueServicesNet |
Income (loss) before income taxes | 25,054 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 23,129 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Operating Segments [Member] | Housekeeping Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 226,581 us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = hcsg_HousekeepingServicesMember |  | 204,741 us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = hcsg_HousekeepingServicesMember |
Income (loss) before income taxes | 20,617 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = hcsg_HousekeepingServicesMember |  | 18,752 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = hcsg_HousekeepingServicesMember |
Operating Segments [Member] | Dietary Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 128,665 us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = hcsg_DietaryServicesMember |  | 107,424 us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = hcsg_DietaryServicesMember |
Income (loss) before income taxes | 8,905 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = hcsg_DietaryServicesMember |  | 6,780 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = hcsg_DietaryServicesMember |
Corporate And Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 0 us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  | 0 us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |
Income (loss) before income taxes | $ (4,468)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | [1] | $ (2,403)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | [1]
[1] | Represents primarily corporate office cost and related overhead, recording of transactions at the reportable segment level which use methods other than U.S. GAAP, as well as consolidated subsidiaries’ operating expenses that are not allocated to the reportable segments, net of investment and interest income.

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- Definition Percentage of revenue and income earned in one geographic segment. + References No definition available. + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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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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