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UNSECURED SENIOR NOTES (Details) $ in Thousands			3 Months Ended
	Apr. 04, 2017 USD ($)	Oct. 26, 2015 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 24, 2019
Mortgage loans and Notes payable
Senior notes, principal amount			$ 2,800,000	$ 2,800,000
Total unsecured senior notes, net			2,769,245	2,768,209
CubeSmart, L.P. and Subsidiaries
Mortgage loans and Notes payable
Total unsecured senior notes, net			2,769,245	2,768,209
Senior Notes
Mortgage loans and Notes payable
Less: Discount on issuance of notes, net			(13,041)	(13,455)
Less: Loan procurement costs, net			(17,714)	(18,336)
Total unsecured senior notes, net			$ (2,769,245)	(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 4.000% due 2025
Mortgage loans and Notes payable
Senior notes, principal amount	$ 50,000	$ 250,000	$ 300,000	300,000
Interest rate (as a percent)	4.00%	4.00%	4.00%
Effective interest rate (as a percent)	3.811%	4.032%	3.99%
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			$ 300,000	300,000
Interest rate (as a percent)			3.125%
Effective interest rate (as a percent)			3.18%
Senior Notes 2.250 % Due 2028
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 4.375 % Due 2029
Mortgage loans and Notes payable
Senior notes, principal amount			$ 350,000	350,000
Interest rate (as a percent)			4.375%		4.375%
Effective interest rate (as a percent)			4.46%
Senior Notes 3.000 % Due 2030
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 2.000 % Due 2031
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 2.500 % Due 2032
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%

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