SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS - Schedule of Units Reflecting Noncontrolling Interests (Details) - shares	Dec. 31, 2025	Dec. 31, 2024
Partnership Subsidiaries
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	59,134,350	59,940,227
Series A-1 preferred units | NSA OP, LP
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	1,193,211	1,202,598
OP units | NSA OP, LP
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	51,321,262	52,173,489
OP units | DownREIT Partnership
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	5,769,214	5,769,214
LTIP units | NSA OP, LP
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	850,663	794,926