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Related Party Transactions - Additional Information (Detail) (USD $) | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011
Related Party Transaction [Line Items] |  |
Fees paid to related party firm, maximum | $ 120,000 | $ 120,000
Percentage of fee paid to related party in relation to related party's total revenues, maximum | 5.00% | 5.00%

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- Definition Percentage Of Fee Paid To Related Party in related to Related Party's Total Revenue. + References No definition available. + Details
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Namespace Prefix: | hcsg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration