BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Involuntary Conversion of Assets (Details) $ in Thousands	1 Months Ended	12 Months Ended
Apr. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) apartmentCommunity	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business Combination and Asset Acquisition [Abstract]
Asset impairment charges	$ 1,300	$ 4,224	$ 0	$ 0
Asset impairment charges, excluding insurance settlement receivable		2,000
Estimated insurance recoveries		$ 1,900
Number of apartment community assets subject to insurance recoveries \| apartmentCommunity		3
Insurance settlements receivable		$ 1,200

Asset Impairment Charges, Excluding Insurance Settlement Receivable

No definition available.

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Period Type:	duration

- Definition

Number Of Apartment Community Assets Subject To Insurance Recoveries

+ References

No definition available.

+ Details

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Namespace Prefix:	csr_
Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482130/360-10-45-4

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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- Definition

Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

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- Definition

Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

+ References

No definition available.

+ Details

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Period Type:	instant