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Summary of Significant Accounting Policies - Carrying Value of Long-Lived Assets (Details) | 3 Months Ended
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Mar. 31, 2020 USD ($) mall other_property | Mar. 31, 2019 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Impairment charges of real estate | $ 133,644,000 | $ 24,825,000
Malls |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Impairment charges of real estate | $ 133,644,000 |
Number of malls with impairment | mall | 2 |
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 | 6 |

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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=118932676&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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