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NONCONTROLLING INTERESTS - Operating Partnership Ownership (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Operating Partnership Ownership
OP Units outstanding which are not owned by the general partner (as a percent)	0.60%		0.80%
OP units outstanding (in shares)	1,460,520	7,365,828	1,901,595
Adjustment for noncontrolling interests in the Operating Partnership	$ 10,356	$ (32,102)	$ (164,100)
CubeSmart, L.P. and Subsidiaries
Operating Partnership Ownership
Adjustment for noncontrolling interests in the Operating Partnership	$ 10,356	$ (32,102)

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- Definition

Represents the percentage of ownership in operating partnership not owned by the general partner.

+ References

No definition available.

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- Definition

Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The number of units or equivalent units outstanding for all classes.

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