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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Condensed Operating Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Related Party Transaction [Line Items]        
Total revenue $ 188,702 $ 193,621 $ 565,898 $ 580,217
Property operating expenses (55,347) (52,712) (166,078) (159,607)
Depreciation and amortization (46,885) (47,661) (142,613) (141,702)
Interest expense (40,549) (39,575) (122,293) (114,920)
Non-operating income (expense) 503 (83) 1,325 352
Net income attributable to National Storage Affiliates Trust 18,427 18,701 50,892 94,790
Joint Venture | Equity Method Investment, Nonconsolidated Investee or Group of Investees        
Related Party Transaction [Line Items]        
Total revenue 62,875 63,293 186,169 180,105
Property operating expenses (21,790) (19,471) (65,615) (56,523)
Supervisory, administrative and other expenses (4,088) (4,150) (12,116) (11,683)
Depreciation and amortization (20,771) (21,671) (63,284) (60,441)
Interest expense (13,653) (13,650) (41,033) (39,405)
Non-operating income (expense) 430 (1,037) 921 (192)
Net income attributable to National Storage Affiliates Trust $ 3,003 $ 3,314 $ 5,042 $ 11,861