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Discontinued Operations - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 0 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Jul. 02, 2012
Dec. 31, 2014
Mar. 16, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale   $ 6,090us-gaap_ProceedsFromDivestitureOfBusinesses      
Contribution to pension plan 84us-gaap_PensionContributions 84us-gaap_PensionContributions      
Memorial Hospital of Adel [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale     8,350us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ssy_MemorialHospitalOfAdelMember
   
Fulton Hospital [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale       6,090us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ssy_FultonHospitalMember
 
Loss on sale of assets 6us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ssy_FultonHospitalMember
197us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ssy_FultonHospitalMember
  197us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ssy_FultonHospitalMember
 
Fulton RDA Loan [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loan agreement amount         5,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ssy_FultonRdaLoanMember
Date of loan agreement       Mar. 16, 2012  
Fulton RDA Loan [Member] | Fulton Hospital [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Repayment of outstanding loan   4,745us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= ssy_FultonRdaLoanMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ssy_FultonHospitalMember
  4,745us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= ssy_FultonRdaLoanMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ssy_FultonHospitalMember
 
Early repayment penalty   $ 237ssy_EarlyRepaymentPenaltyOnDebt
/ us-gaap_DebtInstrumentAxis
= ssy_FultonRdaLoanMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ssy_FultonHospitalMember
  $ 237ssy_EarlyRepaymentPenaltyOnDebt
/ us-gaap_DebtInstrumentAxis
= ssy_FultonRdaLoanMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ssy_FultonHospitalMember