Annual report pursuant to Section 13 and 15(d)

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Condensed Operating Information (Details)

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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Condensed Operating Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]        
Total revenues $ 801,569 $ 585,671 $ 432,222  
Property operating expenses 211,025 155,265 123,486  
Depreciation and amortization (233,158) (158,312) (117,174)  
Interest expense (110,599) (72,062) (62,595)  
Net income attributable to National Storage Affiliates Trust $ 103,737 105,253 48,609  
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Total revenues   212,832 187,861 $ 164,762
Property operating expenses   57,306 50,829 49,632
Net operating income   155,526 137,032 115,130
Supervisory, administrative and other expenses   (13,955) (12,288) (10,935)
Depreciation and amortization   (68,289) (61,628) (61,188)
Interest expense   (41,657) (41,658) (41,204)
Loss on sale of self storage properties   0 0 0
Acquisition costs   (899) (511) (969)
Net income attributable to National Storage Affiliates Trust   $ 30,726 $ 20,947 $ 834