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NONCONTROLLING INTERESTS - Interests in Consolidated Real Estate Joint Ventures (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 17, 2021 USD ($) | Apr. 16, 2021 USD ($) | Mar. 31, 2021 facility | Mar. 31, 2022 USD ($) facility | Mar. 31, 2021 | Dec. 31, 2021 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |
Total assets |  |  |  | $ 6,461,541 |  | $ 6,548,079
Total liabilities |  |  |  | $ 3,522,095 |  | 3,549,699
Joint Venture |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Ownership interest held by the entity (as a percent) |  |  |  |  | 90.00% |
VIE |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 6 |  |
Total assets |  |  |  | $ 156,804 |  |
Total liabilities |  |  |  | $ 62,092 |  |
Astoria Investors, LLC |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Ownership interest held by the entity (as a percent) | 70.00% |  |  |  |  |
Contribution To Real Estate Venture | $ 14,700 |  |  |  |  |
Astoria Investors, LLC | Texas |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Payments to acquire land for development | $ 20,000 |  |  |  |  |
Astoria Investors, LLC | VIE |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 1 |  |
Ownership interest held by the entity (as a percent) |  |  |  | 70.00% |  |
Total assets |  |  |  | $ 21,165 |  |
Total liabilities |  |  |  | 6,559 |  |
Carrying amount of mortgage loans |  |  |  | 6,600 |  |
Amount of mortgage loan commitment |  |  |  | 27,100 |  |
CS Vienna LLC |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Amount of mortgage loan commitment |  |  |  | $ 17,000 |  |
CS Vienna LLC | VIE |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 1 |  |
Ownership interest held by the entity (as a percent) |  |  |  | 72.00% |  |
Total assets |  |  |  | $ 28,766 |  |
Total liabilities |  |  |  | 17,765 |  |
Carrying amount of mortgage loans |  |  |  | $ 16,100 |  |
CS 750 W Merrick Rd LLC | VIE |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 1 |  |
Ownership interest held by the entity (as a percent) |  |  |  | 51.00% |  |
Total assets |  |  |  | $ 35,784 |  |
Total liabilities |  |  |  | 17,544 |  |
Option to put ownership interest in the venture |  |  |  | $ 17,100 |  |
Period of option to call ownership interest of another member |  |  |  | 1 year |  |
Period of Option to Put Ownership Interest in Venture |  |  |  | 2 years |  |
Option to call ownership interest of another member |  |  |  | $ 17,100 |  |
Initiation period for the call option |  |  |  | 12 months |  |
Accretion Liability |  |  |  | $ 15,900 |  |
CS Valley Forge Village Storage LLC | VIE |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 1 |  |
Ownership interest held by the entity (as a percent) |  |  |  | 70.00% |  |
Total assets |  |  |  | $ 20,923 |  |
Total liabilities |  |  |  | 14,230 |  |
Carrying amount of mortgage loans |  |  |  | $ 14,200 |  |
SH3, LLC |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 1 |  |
Ownership interest held by the entity (as a percent) |  |  |  | 90.00% |  |
Total assets |  |  |  | $ 38,655 |  |
Total liabilities |  |  |  | $ 383 |  |
SH3, LLC | VIE |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  | 2 |  |  |
C S Lock Up Anoka LLC | VIE |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 1 |  |
Ownership interest held by the entity (as a percent) |  | 50.00% |  | 50.00% |  |
Contribution To Real Estate Venture |  | $ 3,400 |  |  |  |
Total assets |  |  |  | $ 11,511 |  |
Total liabilities |  |  |  | 5,611 |  |
Carrying amount of mortgage loans |  |  |  | 5,500 |  |
Amount of mortgage loan commitment |  |  |  | 6,100 |  |
C S Lock Up Anoka LLC | VIE | Minnesota |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Purchase Price |  | $ 12,000 |  |  |  |
Ventures |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Total assets |  |  |  | $ 875,410 |  | $ 885,010

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