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NONCONTROLLING INTERESTS - Interests in Consolidated Real Estate Joint Ventures (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 30, 2019 USD ($) | Mar. 07, 2019 USD ($) | Mar. 31, 2020 USD ($) facility | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | May 29, 2019 USD ($)
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Assets |  |  | $ 4,002,762 |  | $ 4,029,545 |  |
Liabilities |  |  | 2,158,627 |  | 2,160,121 |  |
Purchase Price |  |  |  |  | 118,300 |  |
Elimination of noncontrolling interest in subsidiaries due to acquisition |  |  |  | $ 10,000 |  |  |
Noncontrolling interests in subsidiaries |  |  | $ 7,969 |  | $ 7,990 |  |
Reduction to additional paid in capital |  |  |  | $ 4,828 |  |  |
VIE |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  | 6 |  |  |  |
Assets |  |  | $ 100,526 |  |  |  |
Liabilities |  |  | $ 23,397 |  |  |  |
CS Valley Forge Village Storage LLC | VIE |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  | 1 |  |  |  |
Ownership interest held by the entity (as a percent) |  |  | 70.00% |  |  |  |
Assets |  |  | $ 7,022 |  |  |  |
Liabilities |  |  | $ 1,592 |  |  |  |
Shirlington Rd II LLC | VIE |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  | 1 |  |  |  |
Ownership interest held by the entity (as a percent) |  |  | 90.00% |  |  |  |
Assets |  |  | $ 10,429 |  |  |  |
Liabilities |  |  | 998 |  |  |  |
CS 2087 Hempstead Tpk LLC |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Option to call ownership interest of another member |  |  | 6,600 |  |  |  |
Accretion liability |  |  | $ 3,600 |  |  |  |
CS 2087 Hempstead Tpk LLC | VIE |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  | 1 |  |  |  |
Ownership interest held by the entity (as a percent) |  |  | 51.00% |  |  |  |
Assets |  |  | $ 13,543 |  |  |  |
Liabilities |  |  | $ 3,941 |  |  |  |
CS SDP Newtonville LLC | VIE |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  | 1 |  |  |  |
Ownership interest held by the entity (as a percent) |  |  | 90.00% |  |  |  |
Assets |  |  | $ 12,461 |  |  |  |
Liabilities |  |  | 5,938 |  |  |  |
CS 1158 McDonald Ave LLC |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Option to call ownership interest of another member |  |  | 10,000 |  |  |  |
Accretion liability |  |  | $ 9,900 |  |  |  |
CS 1158 McDonald Ave LLC | VIE |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  | 1 |  |  |  |
Ownership interest held by the entity (as a percent) |  |  | 51.00% |  |  |  |
Assets |  |  | $ 42,312 |  |  |  |
Liabilities |  |  | $ 10,687 |  |  |  |
Shirlington Rd LLC |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Elimination of noncontrolling interest in subsidiaries due to acquisition |  | $ 10,000 |  |  |  |  |
Noncontrolling interests in subsidiaries |  | 0 |  |  |  |  |
Reduction to additional paid in capital |  | 9,700 |  |  |  |  |
Amount of debt repaid |  | 12,200 |  |  |  |  |
Shirlington Rd LLC | VIE |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  | 1 |  |  |  |
Ownership interest held by the entity (as a percent) |  |  | 90.00% |  |  |  |
Assets |  |  | $ 14,759 |  |  |  |
Liabilities |  |  | $ 241 |  |  |  |
CS SJM E 92nd Street LLC |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Percentage of the Variable Interest Entity sold | 90.00% |  |  |  |  |  |
Carrying amount of mortgage loans |  |  |  |  |  |  | $ 1,700
Proceeds from sale of real estate, net | $ 3,700 |  |  |  |  |  |
Note receivable |  |  |  |  |  | $ 1,000 |
Amount of debt repaid | 700 |  |  |  |  |  |
Increase (Decrease) Operating Lease Liability | (14,600) |  |  |  |  |  |
Increase (decrease) in operating lease, right-of-use asset | $ (13,400) |  |  |  |  |  |
VIE |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Period of option to call ownership interest of another member |  |  | 1 year |  |  |  |
Period of option to put ownership interest in venture |  |  | 1 year |  |  |  |
Payment made for acquisition of interest in real estate ventures |  | $ 4,800 |  |  |  |  |
VIE | CS Valley Forge Village Storage LLC |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Amount of mortgage loan commitment |  |  | $ 12,400 |  |  |  |
VIE | Shirlington Rd II LLC |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Percentage of interest acquired |  | 10.00% |  |  |  |  |
VIE | CS 2087 Hempstead Tpk LLC |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Option to put ownership interest in the venture |  |  | 6,600 |  |  |  |
VIE | CS SDP Newtonville LLC |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Carrying amount of mortgage loans |  |  | 5,000 |  |  |  |
Amount of mortgage loan commitment |  |  | 12,100 |  |  |  |
VIE | CS 1158 McDonald Ave LLC |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Option to put ownership interest in the venture |  |  | $ 10,000 |  |  |  |
VIE | Shirlington Rd LLC |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |
Percentage of interest acquired |  | 10.00% |  |  |  |  |

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