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NONCONTROLLING INTERESTS - Interests in Consolidated Real Estate Joint Ventures (Details) $ in Thousands, £ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 02, 2015 GBP (£) | Oct. 02, 2015 USD ($) | Jun. 30, 2014 USD ($) facility | Dec. 31, 2017 USD ($) facility | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2008 property | Dec. 15, 2017 | Dec. 31, 2014 GBP (£) | Dec. 31, 2014 USD ($)
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 4.375% |  |
Gain (loss) from sale of land |  |  |  |  |  | $ 17,567 |  |  |  |
Proceeds from sales of facilities, net |  |  |  |  |  | 9,041 |  |  |  |
Gain from sale of real estate, net |  |  |  |  |  | 17,567 |  |  |  |
Elimination of noncontrolling interest in subsidiaries due to acquisition |  |  |  | $ 9,033 |  |  |  |  |  |
Reduction to additional paid in capital |  |  |  | 1,058 | $ 4,799 | $ 178 |  |  |  |
CS 1158 McDonald Ave LLC |  |  |  |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |  |  |  |
Option to call ownership interest of another member |  |  |  | 10,000 |  |  |  |  |  |
Accretion liability |  |  |  | 2,200 |  |  |  |  |  |
CS 160 East 22nd Street LLC |  |  |  |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |  |  |  |
Option to call ownership interest of another member |  |  |  | 11,500 |  |  |  |  |  |
Accretion liability |  |  |  | 3,300 |  |  |  |  |  |
2225 46th Street LLC |  |  |  |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |  |  |  |
Option to call ownership interest of another member |  |  |  | 14,200 |  |  |  |  |  |
Accretion liability |  |  |  | 8,200 |  |  |  |  |  |
2880 Exterior St. LLC |  |  |  |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |  |  |  |
Option to call ownership interest of another member |  |  |  | 37,800 |  |  |  |  |  |
Accretion liability |  |  |  | 28,900 |  |  |  |  |  |
3068 Cropsey Ave LLC |  |  |  |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |  |  |  |
Option to call ownership interest of another member |  |  |  | 20,400 |  |  |  |  |  |
Accretion liability |  |  |  | 20,400 |  |  |  |  |  |
186 Jamaica Ave LLC |  |  |  |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |  |  |  |
Carrying amount of mortgage loans |  |  |  | $ 12,800 |  |  |  |  |  |
VIE |  |  |  |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 10 |  |  |  |  |  |
Total assets |  |  |  | $ 286,211 |  |  |  |  |  |
Total liabilities |  |  |  | $ 130,892 |  |  |  |  |  |
Period of option to call ownership interest of another member |  |  |  | 1 year |  |  |  |  |  |
Period of option to put ownership interest in venture |  |  |  | 1 year |  |  |  |  |  |
VIE | CS 1158 McDonald Ave LLC |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Total assets |  |  |  | $ 18,472 |  |  |  |  |  |
Total liabilities |  |  |  | 2,429 |  |  |  |  |  |
Option to put ownership interest in the venture |  |  |  | $ 10,000 |  |  |  |  |  |
VIE | CS SJM E 92nd Street LLC |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Total assets |  |  |  | $ 1,366 |  |  |  |  |  |
Total liabilities |  |  |  | 1,096 |  |  |  |  |  |
Amount of mortgage loan commitment |  |  |  | $ 6,200 |  |  |  |  |  |
VIE | CS 160 East 22nd Street LLC |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Total assets |  |  |  | $ 5,533 |  |  |  |  |  |
Total liabilities |  |  |  | 3,382 |  |  |  |  |  |
Option to put ownership interest in the venture |  |  |  | $ 11,500 |  |  |  |  |  |
VIE | 2225 46th Street LLC |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Total assets |  |  |  | $ 27,130 |  |  |  |  |  |
Total liabilities |  |  |  | 9,551 |  |  |  |  |  |
Option to put ownership interest in the venture |  |  |  | $ 14,200 |  |  |  |  |  |
VIE | CS SDP Waltham LLC |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Total assets |  |  |  | $ 5,981 |  |  |  |  |  |
Total liabilities |  |  |  | 704 |  |  |  |  |  |
Amount of mortgage loan commitment |  |  |  | $ 10,800 |  |  |  |  |  |
VIE | 2880 Exterior St. LLC |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Total assets |  |  |  | $ 62,763 |  |  |  |  |  |
Total liabilities |  |  |  | 31,575 |  |  |  |  |  |
Option to put ownership interest in the venture |  |  |  | $ 37,800 |  |  |  |  |  |
VIE | 3068 Cropsey Ave LLC |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Total assets |  |  |  | $ 47,952 |  |  |  |  |  |
Total liabilities |  |  |  | 22,189 |  |  |  |  |  |
Option to put ownership interest in the venture |  |  |  | $ 20,400 |  |  |  |  |  |
VIE | 444 55th Street Holdings, LLC |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Total assets |  |  |  | $ 82,216 |  |  |  |  |  |
Total liabilities |  |  |  | 33,858 |  |  |  |  |  |
Assumed mortgage debt, at fair value |  |  |  | 35,000 |  |  |  |  |  |
Outstanding principal balance of mortgage debt assumed on acquisitions |  |  |  | 32,500 |  |  |  |  |  |
Premium on debt assumed on one of the acquisitions |  |  |  | $ 2,500 |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.68% |  |  |  |  |  |
VIE | 186 Jamaica Ave LLC |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Total assets |  |  |  | $ 18,478 |  |  |  |  |  |
Total liabilities |  |  |  | $ 13,289 |  |  |  |  |  |
VIE | Shirlington Rd LLC |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Total assets |  |  |  | $ 16,320 |  |  |  |  |  |
Total liabilities |  |  |  | 12,819 |  |  |  |  |  |
USIFB, LLP |  |  |  |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities owned and operated | property |  |  |  |  |  |  | 2 |  |  |
Ownership interest held by the entity (as a percent) | 97.00% | 97.00% |  |  |  | 97.00% | 97.00% |  |  |
Carrying amount of mortgage loans |  |  |  |  |  |  |  |  | £ 4.1 | $ 6,800
Gain (loss) from sale of land |  | $ 3,000 |  |  |  |  |  |  |  |
Number of assets sold | facility |  |  | 1 |  |  |  |  |  |  |
Proceeds from sales of facilities, net |  |  | $ 7,000 |  |  |  |  |  |  |
Gain from sale of real estate, net |  | 3,000 |  |  |  |  |  |  |  |
Foreign currency translation loss |  | 1,200 |  |  |  |  |  |  |  |
Aggregate sale price | £ 6.5 | $ 9,900 |  |  |  |  |  |  |  |
SRLLC |  |  |  |  |  |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |  |  |  |  |  |
Carrying amount of mortgage loans |  |  |  | 12,700 |  |  |  |  |  |
Amount of mortgage loan commitment |  |  |  | $ 14,600 |  |  |  |  |  |

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