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

ORGANIZATION AND NATURE OF OPERATIONS (Details)

ORGANIZATION AND NATURE OF OPERATIONS (Details) storage_unit in Thousands, ft² in Millions	12 Months Ended
	Dec. 31, 2023 property metropolitan_statistical_area	Dec. 31, 2022 property	Dec. 31, 2023 state	Dec. 31, 2023 ft²	Dec. 31, 2023 storage_unit	Dec. 31, 2023
Real Estate Properties [Line Items]
Number of top metropolitan statistical areas for focus of operations \| metropolitan_statistical_area	100
Number of self storage properties	1,050
Number of states in which self storage properties are located \| state			42
Total rentable square feet in self storage properties \| ft²				68.6
Number of units in real estate property	542,000
Self storage property disposed	32	2
Participating Regional Operators In Eight States \| Disposal Group, Held-for-Sale, Not Discontinued Operations
Real Estate Properties [Line Items]
Number of self storage properties	39
Number of states in which self storage properties are located \| state			8
Total rentable square feet in self storage properties \| ft²				2.4
Number of units in real estate property	18,000				18
Participating Regional Operators In Seven States \| Disposal Group, Held-for-Sale, Not Discontinued Operations
Real Estate Properties [Line Items]
Number of self storage properties	56
Number of states in which self storage properties are located \| state			7
Total rentable square feet in self storage properties \| ft²				3.2
Number of units in real estate property \| storage_unit					24
Consolidated properties
Real Estate Properties [Line Items]
Number of self storage properties	809
Number of states in which self storage properties are located \| state			38
Total rentable square feet in self storage properties \| ft²				51.9
Number of units in real estate property \| storage_unit					407
Unconsolidated properties \| Joint Venture
Real Estate Properties [Line Items]
Number of self storage properties	185
Number of states in which self storage properties are located \| state			21
Total rentable square feet in self storage properties \| ft²				13.5
Number of units in real estate property	111,000
Unconsolidated properties \| Joint Venture \| 2016 Joint Venture
Real Estate Properties [Line Items]
Number of self storage properties	81
Number of states in which self storage properties are located \| state			13
Total rentable square feet in self storage properties \| ft²				5.7
Number of units in real estate property	47,000
Company's equity interest in unconsolidated real estate ventures (percent)						25.00%