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Acquisitions - Additional Information (Detail) (USD $)
12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 17, 2014
Assisted_Living_Unit
Aug. 04, 2014
Independent_Living_Unit
Assisted_Living_Unit
Mar. 26, 2014
Assisted_Living_Unit
Dec. 24, 2013
Assisted_Living_Unit
Independent_Living_Unit
Jun. 30, 2014
May 31, 2007
Independent_Living_Unit
Assisted_Living_Unit
Nov. 30, 2007
Assisted_Living_Unit
Independent_Living_Unit
Dec. 31, 2007
Assisted_Living_Unit
Independent_Living_Unit
Aug. 27, 2014
Assisted_Living_Unit
Jun. 30, 2014
Business Acquisition [Line Items]                          
Percentage of member's equity interest               100.00%csu_BusinessAcquisitionPercentageOfEquityInterestsAcquired         100.00%csu_BusinessAcquisitionPercentageOfEquityInterestsAcquired
Amount of equity interest     $ 243,000us-gaap_PaymentsToAcquireInterestInJointVenture                    
Equity investment valuation gain 1,519,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain                        
Transaction cost related to acquisition               300,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts         300,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Additions to property and equipment 146,100,000us-gaap_PropertyPlantAndEquipmentAdditions 135,400,000us-gaap_PropertyPlantAndEquipmentAdditions                      
Finite lived intangible asset acquired in place leases during period 14,100,000csu_FiniteLivedIntangibleAssetAcquiredInPlaceLeasesDuringPeriod 15,100,000csu_FiniteLivedIntangibleAssetAcquiredInPlaceLeasesDuringPeriod                      
Revenue generated from acquisition 16,600,000us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod 8,000,000us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod                      
Losses before income taxes due to acquisition (4,600,000)us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes (2,200,000)us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes                      
Canton Transaction [Member]                          
Business Acquisition [Line Items]                          
Acquisition cost       14,600,000csu_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet
/ us-gaap_BusinessAcquisitionAxis
= csu_CantonTransactionMember
                 
Number of assisted living units       49csu_NumberOfAssistedLivingUnits
/ us-gaap_BusinessAcquisitionAxis
= csu_CantonTransactionMember
                 
Transaction cost of acquisition       100,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= csu_CantonTransactionMember
                 
Long term finance of Fannie Mae       10,400,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= csu_CantonTransactionMember
                 
Long term fixed rate of Fannie Mae       4.50%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_BusinessAcquisitionAxis
= csu_CantonTransactionMember
                 
Maximum period for expansion of permanent financing       10 years                  
Roanoke Transaction [Member]                          
Business Acquisition [Line Items]                          
Acquisition cost         16,800,000csu_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet
/ us-gaap_BusinessAcquisitionAxis
= csu_RoanokeTransactionMember
               
Number of assisted living units         60csu_NumberOfAssistedLivingUnits
/ us-gaap_BusinessAcquisitionAxis
= csu_RoanokeTransactionMember
               
Transaction cost of acquisition         200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= csu_RoanokeTransactionMember
               
Long term finance of Fannie Mae         12,900,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= csu_RoanokeTransactionMember
               
Long term fixed rate of Fannie Mae         4.59%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_BusinessAcquisitionAxis
= csu_RoanokeTransactionMember
               
Maximum period for expansion of permanent financing         10 years                
Number of independent living units         34csu_NumberOfIndependentLivingUnits
/ us-gaap_BusinessAcquisitionAxis
= csu_RoanokeTransactionMember
               
Oshkosh Transaction [Member]                          
Business Acquisition [Line Items]                          
Acquisition cost         17,100,000csu_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet
/ us-gaap_BusinessAcquisitionAxis
= csu_OshkoshTransactionMember
               
Number of assisted living units         90csu_NumberOfAssistedLivingUnits
/ us-gaap_BusinessAcquisitionAxis
= csu_OshkoshTransactionMember
               
Transaction cost of acquisition         100,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= csu_OshkoshTransactionMember
               
Long term finance of Fannie Mae         13,200,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= csu_OshkoshTransactionMember
               
Long term fixed rate of Fannie Mae         4.59%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_BusinessAcquisitionAxis
= csu_OshkoshTransactionMember
               
Maximum period for expansion of permanent financing         10 years                
Aspen Grove Transaction [Member]                          
Business Acquisition [Line Items]                          
Acquisition cost           14,600,000csu_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet
/ us-gaap_BusinessAcquisitionAxis
= csu_AspenGroveMember
             
Number of assisted living units           78csu_NumberOfAssistedLivingUnits
/ us-gaap_BusinessAcquisitionAxis
= csu_AspenGroveMember
             
Transaction cost of acquisition           200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= csu_AspenGroveMember
             
Long term finance of Fannie Mae           11,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= csu_AspenGroveMember
             
Long term fixed rate of Fannie Mae           5.43%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_BusinessAcquisitionAxis
= csu_AspenGroveMember
             
Maximum period for expansion of permanent financing           12 years              
Anderson, Indiana [Member]                          
Business Acquisition [Line Items]                          
Acquisition cost             57,000,000csu_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet
/ us-gaap_BusinessAcquisitionAxis
= csu_AndersonIndianaMember
           
Number of assisted living units             304csu_NumberOfAssistedLivingUnits
/ us-gaap_BusinessAcquisitionAxis
= csu_AndersonIndianaMember
           
Transaction cost of acquisition             300,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= csu_AndersonIndianaMember
           
Long term finance of Fannie Mae             43,700,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= csu_AndersonIndianaMember
           
Maximum period for expansion of permanent financing             10 years            
Number of independent living units             48csu_NumberOfIndependentLivingUnits
/ us-gaap_BusinessAcquisitionAxis
= csu_AndersonIndianaMember
           
Long term fixed rate of Fannie Mae             5.56%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_BusinessAcquisitionAxis
= csu_AndersonIndianaMember
           
SHPIII/CSL Miami [Member]                          
Business Acquisition [Line Items]                          
Number of assisted living units                 49csu_NumberOfAssistedLivingUnits
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslMiamiMember
       
Long term fixed rate of Fannie Mae               4.30%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslMiamiMember
        4.30%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslMiamiMember
Number of independent living units                 100csu_NumberOfIndependentLivingUnits
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslMiamiMember
       
Mortgage debt from acquisition               16,400,000us-gaap_SecuredLongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslMiamiMember
        16,400,000us-gaap_SecuredLongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslMiamiMember
Term period of mortgage loans               10 years          
Term period of principal amortized               30 years          
SHPIII/CSL Richmond Heights [Member]                          
Business Acquisition [Line Items]                          
Number of assisted living units                   80csu_NumberOfAssistedLivingUnits
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslRichmondHeightsMember
     
Long term fixed rate of Fannie Mae               4.48%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslRichmondHeightsMember
        4.48%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslRichmondHeightsMember
Number of independent living units                   68csu_NumberOfIndependentLivingUnits
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslRichmondHeightsMember
     
Mortgage debt from acquisition               23,700,000us-gaap_SecuredLongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslRichmondHeightsMember
        23,700,000us-gaap_SecuredLongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslRichmondHeightsMember
Term period of mortgage loans               10 years          
Term period of principal amortized               30 years          
SHPIII/CSL Levis Commons [Member]                          
Business Acquisition [Line Items]                          
Number of assisted living units                     56csu_NumberOfAssistedLivingUnits
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslLevisCommonsMember
   
Maximum period for expansion of permanent financing               24 months          
Number of independent living units                     90csu_NumberOfIndependentLivingUnits
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslLevisCommonsMember
   
Interim financing obtained for acquisition               21,600,000csu_InterimFinancingObtainedForAcquisition
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslLevisCommonsMember
        21,600,000csu_InterimFinancingObtainedForAcquisition
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslLevisCommonsMember
Interim financing variable rate               2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslLevisCommonsMember
         
Interim financing variable rate description LIBOR plus 2.75%                        
Plymouth Transaction [Member]                          
Business Acquisition [Line Items]                          
Acquisition cost                       13,500,000csu_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_PlymouthTransactionMember
 
Number of assisted living units                       69csu_NumberOfAssistedLivingUnits
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_PlymouthTransactionMember
 
Transaction cost of acquisition                       100,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_PlymouthTransactionMember
 
Long term finance of Fannie Mae                       10,400,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_PlymouthTransactionMember
 
Long term fixed rate of Fannie Mae                       4.70%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_PlymouthTransactionMember
 
Maximum period for expansion of permanent financing                       10 years  
SHPIII/CSL Transaction [Member]                          
Business Acquisition [Line Items]                          
Percentage of member's equity interest               100.00%csu_BusinessAcquisitionPercentageOfEquityInterestsAcquired
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslTransactionMember
        100.00%csu_BusinessAcquisitionPercentageOfEquityInterestsAcquired
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslTransactionMember
Amount of equity interest               83,600,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslTransactionMember
         
Percentage of equity interest in joint venture               90.00%csu_PercentageOfEquityInterestHoldsInUnconsolidatedJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslTransactionMember
         
Percentage of equity interest owned by company               10.00%csu_PercentageOfEquityInterestOwnedByCompany
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslTransactionMember
         
Equity investment valuation gain                         1,500,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslTransactionMember
Cash proceeds                         $ 2,500,000us-gaap_ProceedsFromOtherEquity
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= csu_ShpiiiCslTransactionMember