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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Carrying Value of Long-Lived Assets (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) mall other_property | Dec. 31, 2019 USD ($) mall | Dec. 31, 2018 USD ($) mall
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Impairment charges of real estate | $ 213,358,000 | $ 239,521,000 | $ 174,529,000
Number of malls with impairment | mall | 6 | 6 | 5
Malls |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Impairment charges of real estate | $ 213,358,000 |  |
Number of malls with impairment | mall | 6 |  |
Other Properties |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Impairment charges of real estate | $ 0 |  |
Number of other properties with impairment | other_property | 7 |  |

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- Definition Number of malls with impairment + References No definition available. + Details
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- Definition Number of other properties with impairment. + References No definition available. + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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