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UNSECURED SENIOR NOTES (Details) $ in Thousands			12 Months Ended
	Apr. 04, 2017 USD ($)	Oct. 26, 2015 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 24, 2019 USD ($)
Mortgage loans and Notes payable
Total unsecured senior notes, net			$ 2,772,350	$ 2,768,209
Loss on early extinguishment of debt				(20,328)	$ (18,020)
CubeSmart, L.P. and Subsidiaries
Mortgage loans and Notes payable
Less: Loan procurement costs, net			(5,182)	(2,322)
Total unsecured senior notes, net			2,772,350	2,768,209
Loss on early extinguishment of debt				(20,328)	$ (18,020)
Senior Notes
Mortgage loans and Notes payable
Less: Discount on issuance of notes, net			(11,801)	(13,455)
Less: Loan procurement costs, net			(15,849)	(18,336)
Total unsecured senior notes, net			$ (2,772,350)	(2,768,209)
Senior Notes | Maximum
Mortgage loans and Notes payable
Consolidated leverage ratio			0.60
Secured debt leverage ratio			0.40
Senior Notes | Minimum
Mortgage loans and Notes payable
Consolidated interest coverage ratio			1.50
Financial and customary covenant, minimum unencumbered asset (as a percent)			150.00%
Senior notes 4.375% due December 15, 2023
Mortgage loans and Notes payable
Senior notes, principal amount			$ 300,000	300,000		$ 300,000
Interest rate (as a percent)			4.00%			4.375%
Effective interest rate (as a percent)			3.99%
Senior notes 4.000% due 2025
Mortgage loans and Notes payable
Senior notes, principal amount			$ 300,000	300,000
Interest rate (as a percent)	4.00%	4.00%	3.125%
Effective interest rate (as a percent)	3.811%	4.032%	3.18%
Effective weighted average interest rate (as a percent)			3.994%
Proceeds from senior notes	$ 50,000	$ 250,000
Debt instrument, redemption percentage	101.343%	99.735%
Senior Notes 3.125% Due 2026
Mortgage loans and Notes payable
Senior notes, principal amount			$ 550,000	550,000
Interest rate (as a percent)			2.25%
Effective interest rate (as a percent)			2.33%
Senior Notes 2.250 % Due 2028
Mortgage loans and Notes payable
Senior notes, principal amount			$ 350,000	350,000
Interest rate (as a percent)			4.375%
Effective interest rate (as a percent)			4.46%
Senior Notes 4.375 % Due 2029
Mortgage loans and Notes payable
Senior notes, principal amount			$ 350,000	350,000
Interest rate (as a percent)			3.00%
Effective interest rate (as a percent)			3.04%
Senior Notes 3.000 % Due 2030
Mortgage loans and Notes payable
Senior notes, principal amount			$ 450,000	450,000
Interest rate (as a percent)			2.00%
Effective interest rate (as a percent)			2.10%
Senior Notes 2.000 % Due 2031
Mortgage loans and Notes payable
Senior notes, principal amount			$ 500,000	500,000
Interest rate (as a percent)			2.50%
Effective interest rate (as a percent)			2.59%
Senior Notes 2.500 % Due 2032
Mortgage loans and Notes payable
Senior notes, principal amount			$ 2,800,000	$ 2,800,000

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