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

SUBSEQUENT EVENTS - Disposition of Self Storage Properties (Details)

SUBSEQUENT EVENTS - Disposition of Self Storage Properties (Details) $ in Thousands		2 Months Ended	12 Months Ended
	Feb. 01, 2024 USD ($) ft² property storage_unit	Feb. 27, 2024 USD ($) ft² storage_unit	Dec. 31, 2023 USD ($) ft² property storage_unit	Dec. 31, 2022 USD ($)
Subsequent Event [Line Items]
Number of properties			1,050
Total rentable square feet in self storage properties \| ft²			68,600,000
Number of units in real estate property			542,000
Carrying value \| $			$ 3,668,757	$ 3,560,570
Term loan B \| Credit Facility \| Unsecured debt
Subsequent Event [Line Items]
Carrying value \| $			$ 275,000	$ 250,000
Disposal Group, Held-for-Sale, Not Discontinued Operations \| Participating Regional Operators In Seven States
Subsequent Event [Line Items]
Number of properties			56
Total rentable square feet in self storage properties \| ft²			3,200,000
Number of units in real estate property \| storage_unit			24,000
Wholly Owned Properties
Subsequent Event [Line Items]
Number of sold self storage properties			32
Subsequent Event
Subsequent Event [Line Items]
Total rentable square feet in self storage properties \| ft²		3,200,000
Aggregate purchase price of acquired property \| $		$ 346,500
Number of units in real estate property \| storage_unit		24,000
Subsequent Event \| Term loan B \| Credit Facility \| Unsecured debt
Subsequent Event [Line Items]
Carrying value \| $		$ 130,000
Subsequent Event \| Wholly Owned Properties
Subsequent Event [Line Items]
Disposition of self storage properties	38
Number of properties	71
Total rentable square feet in self storage properties \| ft²	4,400,000
Aggregate purchase price of acquired property \| $	$ 530,000
Number of storage units \| storage_unit	34,000
Number of sold self storage properties	38