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EARNINGS PER SHARE - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2025 shares	Sep. 30, 2024 shares	Sep. 30, 2025 shares	Sep. 30, 2024 shares
OP units | NSA OP, LP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unit conversion ratio			1
OP units | DownREIT Partnership
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unit conversion ratio			1
LTIP units | NSA OP, LP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unit conversion ratio			1
LTIP units with vesting based on service or market condition
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equity interests excluded from computation of diluted earnings per share (in shares)	766,017		766,017
OP units, DownREIT OP units, Subordinated performance units, DownREIT subordinated performance units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equity interests excluded from computation of diluted earnings per share (in shares)	57,700,000	58,600,000	57,900,000	58,200,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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