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UNSECURED SENIOR NOTES (Details) $ in Thousands				12 Months Ended
	Dec. 15, 2017 USD ($)	Nov. 15, 2017 USD ($)	Apr. 04, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Mortgage loans and Notes payable
Interest rate (as a percent)	4.375%
Less: Loan procurement costs, net				$ (1,592)	$ (2,150)
Total unsecured senior notes, net				1,142,460	1,039,076
CubeSmart, L.P. and Subsidiaries
Mortgage loans and Notes payable
Less: Loan procurement costs, net				(1,592)	(2,150)
Total unsecured senior notes, net				1,142,460	1,039,076
Senior Notes
Mortgage loans and Notes payable
Carrying value				1,150,000	1,050,000
Less: Discount on issuance of notes, net				(617)	(3,971)
Less: Loan procurement costs, net				(6,923)	(6,953)
Total unsecured senior notes, net				$ 1,142,460	1,039,076
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 4.800% due 2022
Mortgage loans and Notes payable
Senior notes, principal amount				$ 250,000	$ 250,000
Interest rate (as a percent)				4.80%	4.80%
Carrying value				$ 250,000	$ 250,000
Effective interest rate (as a percent)				4.82%
Senior notes 4.375% due 2023
Mortgage loans and Notes payable
Senior notes, principal amount				$ 300,000	$ 300,000
Interest rate (as a percent)			4.375%	4.375%	4.375%
Carrying value				$ 300,000	$ 250,000
Effective interest rate (as a percent)				4.33%
Effective weighted average interest rate (as a percent)	4.501%		3.495%	4.33%
Proceeds from senior notes	$ 250,000		$ 50,000
Debt instrument, redemption percentage	98.995%		105.04%
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%	4.00%	4.00%
Carrying value				$ 300,000	$ 250,000
Effective interest rate (as a percent)		4.032%	3.811%	3.99%
Effective weighted average interest rate (as a percent)				3.994%
Proceeds from senior notes		$ 250,000	$ 50,000
Debt instrument, redemption percentage		99.735%	101.343%
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%	3.125%
Carrying value				$ 300,000	$ 300,000
Effective interest rate (as a percent)				3.18%
Credit Facility
Mortgage loans and Notes payable
Less: Loan procurement costs, net				$ (604)	$ (1,251)

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The interest coverage ratio permitted under the terms of a senior credit facility covenant.

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