National Storage Affiliates Trust Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

DEBT FINANCING - Narrative (Details)

DEBT FINANCING - Narrative (Details)		9 Months Ended
DEBT FINANCING - Narrative (Details)	Aug. 09, 2021	Sep. 30, 2021 USD ($)	Jul. 09, 2021 USD ($) property	May 03, 2021 USD ($)
Unsecured debt \| Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,400,000,000
Maximum borrowing capacity if expansion option is exercised		1,750,000,000
Unsecured debt \| 2026 Senior Unsecured Notes
Debt Instrument [Line Items]
Debt issued				$ 35,000,000
Interest rate				2.16%
Unsecured debt \| 2031 Notes
Debt Instrument [Line Items]
Debt issued				$ 90,000,000
Interest rate				3.00%
Unsecured debt \| 2033 Notes
Debt Instrument [Line Items]
Debt issued				$ 55,000,000
Interest rate				3.10%
Fixed rate mortgages payable \| 2028 Fixed Rate Mortgage Payable
Debt Instrument [Line Items]
Debt issued			$ 88,000,000
Interest rate			2.77%
Number of properties securing debt \| property			8
Revolving line of credit \| Revolving line of credit \| Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		500,000,000
Revolving line of credit remaining borrowing capacity		494,300,000
Term loan A \| Unsecured debt \| Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		125,000,000
Term loan B \| Unsecured debt \| Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		250,000,000
Term loan C \| Unsecured debt \| Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		225,000,000
Term loan D \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.10%
Credit rating pricing election (percent)	0.80%
Term loan D \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.55%
Credit rating pricing election (percent)	1.60%
Term loan D \| Base Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.10%
Credit rating pricing election (percent)	0.00%
Term loan D \| Base Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.55%
Credit rating pricing election (percent)	0.60%
Term loan D \| Unsecured debt \| Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 175,000,000
Term loan E \| Fed Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		0.50%
Term loan E \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		1.00%
Term loan E \| LIBOR \| Minimum
Debt Instrument [Line Items]
Leverage based margin threshold (percent)		1.10%
Credit rating pricing election (percent)		0.80%
Term loan E \| LIBOR \| Maximum
Debt Instrument [Line Items]
Leverage based margin threshold (percent)		1.55%
Credit rating pricing election (percent)		1.60%
Term loan E \| Base Rate \| Minimum
Debt Instrument [Line Items]
Leverage based margin threshold (percent)		0.10%
Credit rating pricing election (percent)		0.00%
Term loan E \| Base Rate \| Maximum
Debt Instrument [Line Items]
Leverage based margin threshold (percent)		0.55%
Credit rating pricing election (percent)		0.60%
Term loan E \| Unsecured debt \| Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 125,000,000
Letter of credit \| Revolving line of credit \| Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding		$ 5,700,000