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Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended 0 Months Ended
Nov. 21, 2014
Mar. 31, 2015
Sep. 30, 2013
Dec. 31, 2014
Debt Instrument [Line Items]        
Mortgage loan outstanding balance   204.1us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages   $ 205.3us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
7.0% Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Company issued senior unsecured notes 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= soho_SevenPointZeroPercentUnsecuredSeniorNotesMember
     
Borrowed amount 25.3us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= soho_SevenPointZeroPercentUnsecuredSeniorNotesMember
     
Debt instrument maturity date   Nov. 15, 2019    
Notes face value 101.00%soho_PercentageOfCallableRateOnPrincipalAmount
/ us-gaap_DebtInstrumentAxis
= soho_SevenPointZeroPercentUnsecuredSeniorNotesMember
     
8.0% Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Company issued senior unsecured notes     8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= soho_EightPointZeroPercentUnsecuredSeniorNoteMember
 
Borrowed amount     $ 27.6us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= soho_EightPointZeroPercentUnsecuredSeniorNoteMember
 
Debt instrument maturity date   Sep. 30, 2018    
Notes face value     101.00%soho_PercentageOfCallableRateOnPrincipalAmount
/ us-gaap_DebtInstrumentAxis
= soho_EightPointZeroPercentUnsecuredSeniorNoteMember