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ACQUISITIONS AND DISPOSITIONS - Additional Information (Details) $ / shares in Units, ft² in Thousands, $ in Thousands, shares in Millions |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 05, 2018 USD ($) | Sep. 08, 2017 USD ($) | May 25, 2017 USD ($) ft² $ / shares shares | Feb. 02, 2017 USD ($) ft² | Jan. 17, 2017 USD ($) ft² | Jan. 04, 2017 USD ($) ft² $ / shares shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) ft² | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Apr. 23, 2018 USD ($) | Jun. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in sq ft) | ft² |  |  |  |  |  |  |  | 16,300 |  |  |  |
Business acquisition, transaction costs |  |  |  |  |  |  |  | $ 100 | $ 11,300 |  |  |
Income from acquired leasehold interest |  |  |  |  |  |  |  | 0 | 39,215 | $ 0 |  |
Business acquisition, consideration paid |  |  |  |  |  |  |  | 4,931 | 463,669 |  |  |
Impairment loss on real estate |  |  |  |  |  |  |  | 5,574 | 5,637 | 0 |  |
Gain on sale of real estate |  |  |  |  |  |  |  | 52,625 | 202 | $ 15,618 |  |
Eatontown, NJ | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss on real estate |  |  |  |  |  |  |  |  | 3,500 |  |  |
Consideration received on sale of real estate part of disposal group |  |  |  |  |  |  |  |  |  |  |  | $ 4,800
Kearny, NJ | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration received on sale of real estate part of disposal group |  | $ 300 |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate |  | $ 200 |  |  |  |  |  |  |  |  |  |
Allentown, PA | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration received on sale of real estate part of disposal group |  |  |  |  |  |  |  |  |  |  | $ 54,300 |
Gain on sale of real estate |  |  |  |  |  |  |  | 50,400 |  |  |  |
West Babylon, NY | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss on real estate |  |  |  |  |  |  |  | $ 2,500 |  |  |  |
Yonkers Gateway Center |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash acquisition price |  |  |  |  |  | $ 2,900 |  |  |  |  |  |
Area of real estate property (in sq ft) | ft² |  |  |  |  |  | 0 |  |  |  |  |  |
Business acquisition, equity interest issued or issuable, value |  |  |  |  |  | $ 48,800 |  |  |  |  |  |
Business acquisition, equity interest issued or issuable, units (in shares) | shares |  |  |  |  |  | 1.8 |  |  |  |  |  |
Business acquisition, unit price (in dollars per share) | $ / shares |  |  |  |  |  | $ 27.09 |  |  |  |  |  |
Business acquisition, transaction costs |  |  |  |  |  | $ 200 |  |  |  |  |  |
Business acquisition, consideration paid |  |  |  |  |  | $ 51,902 |  |  |  |  |  |
Shops at Bruckner |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash acquisition price |  |  |  |  | $ 19,400 |  |  |  |  |  |  |
Area of real estate property (in sq ft) | ft² |  |  |  |  | 114 |  |  |  |  |  |  |
Business acquisition, transaction costs |  |  |  |  | $ 300 |  |  |  |  |  |  |
Income from acquired leasehold interest |  |  |  |  |  |  |  |  | $ 39,200 |  |  |
Business acquisition, consideration paid |  |  |  |  | 32,269 |  |  |  |  |  |  |
Shops at Bruckner | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, debt assumed |  |  |  |  | $ 12,600 |  |  |  |  |  |  |
Hudson Mall |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash acquisition price |  |  |  | $ 19,900 |  |  |  |  |  |  |  |
Area of real estate property (in sq ft) | ft² |  |  |  | 383 |  |  |  |  |  |  |  |
Business acquisition, transaction costs |  |  |  | $ 600 |  |  |  |  |  |  |  |
Business acquisition, consideration paid |  |  |  | 44,273 |  |  |  |  |  |  |  |
Hudson Mall | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, debt assumed |  |  |  | $ 23,800 |  |  |  |  |  |  |  |
Ackerman Portfolio |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash acquisition price |  |  | $ 44,000 |  |  |  |  |  |  |  |  |
Business acquisition, equity interest issued or issuable, value |  |  | $ 122,000 |  |  |  |  |  |  |  |  |
Business acquisition, equity interest issued or issuable, units (in shares) | shares |  |  | 4.5 |  |  |  |  |  |  |  |  |
Business acquisition, unit price (in dollars per share) | $ / shares |  |  | $ 27.02 |  |  |  |  |  |  |  |  |
Business acquisition, transaction costs |  |  | $ 10,200 |  |  |  |  |  |  |  |  |
Business acquisition, debt assumed |  |  | $ 33,000 |  |  |  |  |  |  |  |  |
Area of land (in sq ft/acres) | ft² |  |  | 1,500 |  |  |  |  |  |  |  |  |
Business acquisition, consideration paid |  |  | $ 325,000 |  |  |  |  |  |  |  |  |
Percentage of leased area |  |  | 83.00% |  |  |  |  |  |  |  |  |
Ackerman Portfolio | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, non-recourse debt issued |  |  | $ 126,000 |  |  |  |  |  |  |  |  |
Office Building in Maywood, NJ | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, consideration paid |  |  |  |  |  |  | $ 7,100 |  |  |  |  |
Kearny, NJ | Excess Land Cherry Hill, NJ | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration received on sale of real estate part of disposal group | $ 3,300 |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate | $ 2,200 |  |  |  |  |  |  |  |  |  |  |

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