EARNINGS PER SHARE AND UNIT AND SHAREHOLDERS' EQUITY AND CAPITAL - Earnings Per Share and Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Basic and diluted earnings per common share
Net income	$ 97,942	$ 38,266
Noncontrolling interests in the Operating Partnership	(614)	(292)
Noncontrolling interest in subsidiaries	238	181
NET INCOME ATTRIBUTABLE TO THE COMPANY'S COMMON SHAREHOLDERS	$ 97,566	$ 38,155
Weighted average basic shares outstanding (in shares)	225,294,000	224,663,000
Share options and restricted share units (in shares)	889,000	1,074,000
Weighted-average diluted shares outstanding (in shares)	226,183,000	225,737,000
Basic earnings per share attributable to common shareholders (in dollars per share)	$ 0.43	$ 0.17
Diluted earnings per share attributable to common shareholders (in dollars per share)	$ 0.43	$ 0.17
Basic and diluted earnings per common unit
Noncontrolling interests in the Operating Partnership	$ (614)	$ (292)
Weighted average basic shares outstanding (in shares)	225,294,000	224,663,000
Share options and restricted share units (in shares)	889,000	1,074,000
Weighted-average diluted shares outstanding (in shares)	226,183,000	225,737,000
Diluted earnings per share attributable to common shareholders (in dollars per share)	$ 0.43	$ 0.17
Potentially dilutive shares not included in the earnings per share calculation as their effect is antidilutive (in shares)	700,000	300,000
Common stock, cash dividends declared (in dollars per share)	$ 0.49	$ 0.43
OP units outstanding (in shares)	1,418,549	1,460,520	1,426,549
Common shares, shares outstanding	224,671,525	224,433,506	224,603,462
Operating Partnership [Member]
Basic and diluted earnings per common unit
Potentially dilutive shares not included in the earnings per share calculation as their effect is antidilutive (in shares)	1,400,000	1,700,000
CubeSmart, L.P. and Subsidiaries
Basic and diluted earnings per common share
Net income	$ 97,942	$ 38,266
Noncontrolling interests in the Operating Partnership	$ (614)	$ (292)
Weighted average basic shares outstanding (in shares)	225,294,000	224,663,000
Share options and restricted share units (in shares)	889,000	1,074,000
Weighted-average diluted shares outstanding (in shares)	226,183,000	225,737,000
Diluted earnings per share attributable to common shareholders (in dollars per share)	$ 0.43	$ 0.17
Basic and diluted earnings per common unit
Net Income	$ 97,942	$ 38,266
Noncontrolling interests in the Operating Partnership	(614)	(292)
Noncontrolling interest in subsidiaries	238	181
Net income attributable to common unitholders	$ 97,566	$ 38,155
Weighted average basic shares outstanding (in shares)	225,294,000	224,663,000
Share options and restricted share units (in shares)	889,000	1,074,000
Weighted-average diluted shares outstanding (in shares)	226,183,000	225,737,000
Basic earnings per unit attributable to common unitholders (in dollars per share)	$ 0.43	$ 0.17
Diluted earnings per share attributable to common shareholders (in dollars per share)	$ 0.43	$ 0.17

n/a

No definition available.

Name:	cube_EarningsPerUnitReconciliationAbstract
Namespace Prefix:	cube_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.