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UNSECURED SENIOR NOTES (Details) $ in Thousands		3 Months Ended
	Apr. 04, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Mortgage loans and Notes payable
Less: Loan procurement costs, net		$ (2,038)	$ (2,150)
Total unsecured senior notes, net		1,039,423	1,039,076
CubeSmart, L.P. and Subsidiaries
Mortgage loans and Notes payable
Less: Loan procurement costs, net		(2,038)	(2,150)
Total unsecured senior notes, net		1,039,423	1,039,076
Senior Notes
Mortgage loans and Notes payable
Carrying value		1,050,000	1,050,000
Less: Discount on issuance of notes, net		(3,846)	(3,971)
Less: Loan procurement costs, net		(6,731)	(6,953)
Total unsecured senior notes, net		$ 1,039,423	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
Interest rate (as a percent)		4.80%
Carrying value		$ 250,000	250,000
Effective interest rate of senior notes (as a percent)		4.82%
Senior notes 4.375% due 2023
Mortgage loans and Notes payable
Senior notes, principal amount		$ 250,000
Interest rate (as a percent)		4.375%
Carrying value		$ 250,000	250,000
Effective interest rate of senior notes (as a percent)		4.50%
Senior notes 4.375% due 2023 | CubeSmart, L.P. and Subsidiaries | Subsequent event
Mortgage loans and Notes payable
Interest rate (as a percent)	4.375%
Effective interest rate of senior notes (as a percent)	3.495%
Proceeds from senior notes	$ 50,000
Senior notes 4.000% due 2025
Mortgage loans and Notes payable
Senior notes, principal amount		$ 250,000
Interest rate (as a percent)		4.00%
Carrying value		$ 250,000	250,000
Effective interest rate of senior notes (as a percent)		4.03%
Senior notes 4.000% due 2025 | CubeSmart, L.P. and Subsidiaries | Subsequent event
Mortgage loans and Notes payable
Interest rate (as a percent)	4.00%
Effective interest rate of senior notes (as a percent)	3.811%
Proceeds from senior notes	$ 50,000
Senior Notes 3.125% Due 2026
Mortgage loans and Notes payable
Senior notes, principal amount		$ 300,000
Interest rate (as a percent)		3.125%
Carrying value		$ 300,000	$ 300,000
Effective interest rate of senior notes (as a percent)		3.18%

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

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