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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Operating Partnership, Purchase Allocation, Depreciation and Amortization (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Partnership Ownership |  |  |
Increase (decrease) to OP units owned by third parties and a corresponding decrease to capital | $ 3,965 | $ (7,388) | $ 19,619
Purchase Price Allocation |  |  |
Amount of purchase price allocated to above- or below-market lease intangibles | $ 0 |  |
Minimum |  |  |
Depreciation and Amortization |  |  |
Useful lives of self-storage facilities and improvements | 5 years |  |
Maximum |  |  |
Depreciation and Amortization |  |  |
Useful lives of self-storage facilities and improvements | 39 years |  |
CubeSmart, L.P. and Subsidiaries |  |  |
Operating Partnership Ownership |  |  |
Increase (decrease) to OP units owned by third parties and a corresponding decrease to capital | $ 3,965 | $ (7,388) | $ (19,619)

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