National Storage Affiliates Trust Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Narrative (Details)

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Narrative (Details) $ in Thousands, ft² in Millions	2 Months Ended	3 Months Ended	12 Months Ended
	Feb. 27, 2024 USD ($) ft² storage_unit	Dec. 31, 2023 USD ($) ft² property state storage_unit extension_period	Dec. 31, 2023 USD ($) ft² property state storage_unit	Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of self storage properties \| property		1,050	1,050
Number of states in which self storage properties are located \| state		42	42
Total rentable square feet in self storage properties \| ft²		68.6	68.6
Investment in unconsolidated real estate ventures		$ 211,361	$ 211,361	$ 227,441
Number of units in real estate property \| property		542,000	542,000
Contributions to unconsolidated real estate venture			$ 0	$ 55,044	$ 0
Subsequent Event
Schedule of Equity Method Investments [Line Items]
Total rentable square feet in self storage properties \| ft²	3.2
Number of units in real estate property \| storage_unit	24,000
2024 Joint Venture \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Real estate investments, joint ventures	$ 210,000
Company's equity interest in unconsolidated real estate ventures (percent)	6.05%
Real estate investments, joint ventures, maturity period	5 years
2023 Joint Venture
Schedule of Equity Method Investments [Line Items]
Real estate investments, joint ventures, maturity period		24 months
Number of extension periods \| extension_period		2
Extension period		6 months
Joint Venture \| Unconsolidated properties
Schedule of Equity Method Investments [Line Items]
Number of self storage properties \| property		185	185
Number of states in which self storage properties are located \| state		21	21
Total rentable square feet in self storage properties \| ft²		13.5	13.5
Number of units in real estate property \| property		111,000	111,000
Joint Venture \| 2024 Joint Venture \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Real estate investments, joint ventures	$ 140,800
Joint Venture \| 2018 Joint Venture
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)		25.00%	25.00%
Contributions to unconsolidated real estate venture			$ 1,600
Joint Venture \| 2018 Joint Venture \| Unconsolidated properties
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)		25.00%	25.00%
Number of self storage properties \| property		104	104
Number of states in which self storage properties are located \| state		17	17
Total rentable square feet in self storage properties \| ft²		7.8	7.8
Number of units in real estate property \| storage_unit		64,000	64,000
Number of properties acquired \| property			1
Payments to acquire property			$ 6,600
Joint Venture \| 2016 Joint Venture
Schedule of Equity Method Investments [Line Items]
Contributions to unconsolidated real estate venture			$ 51,900
Joint Venture \| 2016 Joint Venture \| Unconsolidated properties
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)		25.00%	25.00%
Number of self storage properties \| property		81	81
Number of states in which self storage properties are located \| state		13	13
Total rentable square feet in self storage properties \| ft²		5.7	5.7
Number of units in real estate property \| property		47,000	47,000
Number of properties acquired \| property				7
Payments to acquire property				$ 207,600
2024 NSA Member \| 2024 Joint Venture \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Real estate investments, joint ventures	$ 35,200
Company's equity interest in unconsolidated real estate ventures (percent)	25.00%
2024 JV Investor \| 2024 Joint Venture
Schedule of Equity Method Investments [Line Items]
Number of self storage properties \| property		56	56
Number of states in which self storage properties are located \| state		7	7
Total rentable square feet in self storage properties \| ft²		3.2	3.2
Number of storage units \| storage_unit		24,000	24,000
2024 JV Investor \| 2024 Joint Venture \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Real estate investments, joint ventures	$ 105,600
Company's equity interest in unconsolidated real estate ventures (percent)	75.00%
2023 JV Members \| 2023 Joint Venture
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)		75.00%	75.00%
Investment in unconsolidated real estate ventures		$ 400,000	$ 400,000
2023 NSA Member \| 2023 Joint Venture
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)		25.00%	25.00%