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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassifications (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cash paid upon vesting of restricted shares | $ (2,046) | $ (1,638) | $ (1,567)
Accounting Standards Update 2016-09 | Reclassifications |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cash paid upon vesting of restricted shares |  | 1,600 | 1,600
CubeSmart, L.P. and Subsidiaries |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cash paid upon vesting of restricted shares | $ (2,046) | $ (1,638) | $ (1,567)

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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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