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

SUBSEQUENT EVENTS - Subordinated Performance Unit To OP Unit Conversions (Details)

SUBSEQUENT EVENTS - Subordinated Performance Unit To OP Unit Conversions (Details) - shares		12 Months Ended
	Jan. 01, 2023	Dec. 31, 2022	Dec. 31, 2021
Subordinated performance units
Subsequent Event [Line Items]
Period prior to conversion for conversion rate metric		1 year
Percentage of CAD per unit used in conversion rate calculation		110.00%
Subordinated performance units \| NSA OP, LP
Subsequent Event [Line Items]
Minimum conversion period (in years)		2 years
Number of units requested for conversion (in units)		397,000
Outstanding equity interest (in shares)		8,154,524	9,754,482
Subordinated performance units \| DownREIT Partnership
Subsequent Event [Line Items]
Minimum conversion period (in years)		5 years
Outstanding equity interest (in shares)		4,337,111	4,337,111
DownREIT Subordinated Performance Performance Units \| NSA OP, LP
Subsequent Event [Line Items]
Number of units requested for conversion (in units)		203,637
OP units
Subsequent Event [Line Items]
Issuance of shares/units (in shares)		3,911,260
OP units \| NSA OP, LP
Subsequent Event [Line Items]
Minimum conversion period (in years)		1 year
Issuance of shares/units (in shares)	481,811
Outstanding equity interest (in shares)		35,737,281	31,893,105
OP units \| DownREIT Partnership
Subsequent Event [Line Items]
Minimum conversion period (in years)		5 years
Outstanding equity interest (in shares)		1,924,918	1,924,918
Subsequent Event
Subsequent Event [Line Items]
Period prior to conversion for conversion rate metric	2 years
Subsequent Event \| Subordinated performance units
Subsequent Event [Line Items]
Percentage of CAD per unit used in conversion rate calculation	110.00%
Subsequent Event \| OP units \| DownREIT Partnership
Subsequent Event [Line Items]
Outstanding equity interest (in shares)	195,573