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, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]      
Total revenues $ 585,671 $ 432,222 $ 387,896
Property operating expenses 155,265 123,486 110,347
Depreciation and amortization (158,312) (117,174) (105,119)
Interest expense (72,062) (62,595) (56,464)
Net income attributable to National Storage Affiliates Trust 105,253 48,609 3,983
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Total revenues 187,861 164,762 162,827
Property operating expenses 50,829 49,632 49,845
Net operating income 137,032 115,130 112,982
Supervisory, administrative and other expenses (12,288) (10,935) (10,818)
Depreciation and amortization (61,628) (61,188) (79,556)
Interest expense (41,658) (41,204) (39,936)
Loss on sale of self storage properties 0 0 (806)
Acquisition costs (511) (969) (1,971)
Net income attributable to National Storage Affiliates Trust $ 20,947 $ 834 $ (20,105)