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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Change in Depreciable Lives of Real Estate Assets and Real Estate Held For Sale (Details) - apartmentProperty | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Real Estate Properties [Line Items] |  |
Number of year after date of acquisition related to adjustment of real estate preliminary allocations of purchase price | 1 year |
Assets Held for Sale |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties classified as held for sale | 0 | 0

X
- Definition Number of real estate properties classified as held for sale. + References No definition available. + Details
Name: | csr_NumberOfRealEstatePropertiesClassifiedAsHeldForSale
Namespace Prefix: | csr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of year after the date of acquisition related to adjustment of real estate preliminary allocations of the purchase price. + References No definition available. + Details
Name: | csr_NumberOfYearAfterDateOfAcquisitionRelatedToAdjustmentOfRealEstatePreliminaryAllocationsOfPurchasePrice
Namespace Prefix: | csr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |