XML 50 R39.htm IDEA: XBRL DOCUMENT
v3.25.3

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Impairment of Long-Lived Assets (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) apartmentCommunity | Sep. 30, 2024 USD ($)
Accounting Policies [Abstract] |  |  |  |
Impairment of real estate investments | $ | $ 8,676,000 | $ 0 | $ 23,219,000 | $ 0
Number of apartment communities impaired during period | apartmentCommunity |  |  | 6 |

X
- Definition Number Of Apartment Communities Impaired During Period + References No definition available. + Details
Name: | csr_NumberOfApartmentCommunitiesImpairedDuringPeriod
Namespace Prefix: | csr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-2 + Details
Name: | us-gaap_ImpairmentOfRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration