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Summary of Significant Accounting Policies - Carrying Value of Long-Lived Assets (Details)	3 Months Ended
	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 malls with impairment

+ References

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Number of other properties with impairment.

+ References

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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

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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.

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