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UNCONSOLIDATED AFFILIATES AND COST METHOD INVESTMENT - Company Investments (Details) - entity | Dec. 31, 2018 | Apr. 30, 2018 | Nov. 30, 2017 | Sep. 30, 2017
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Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of entities - equity method of accounting (entity) | 21 |  |  |
Number of 50/50 joint ventures | 15 |  |  |
Parent Company | EastGate Storage, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.00% |
Parent Company | Self Storage at Mid Rivers, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest in joint venture (as a percent) |  | 50.00% |  |
Parent Company | Shoppes at Eagle Point, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  | 50.00%
Minimum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest in joint venture (as a percent) | 10.00% |  |  |
Maximum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest in joint venture (as a percent) | 65.00% |  |  |

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