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Summary of Significant Accounting Policies - Carrying Value of Long-Lived Assets and Investment in Unconsolidated Affiliates (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) investment	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) mall other_property investment	Sep. 30, 2019 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Impairment charges of real estate	$ 46,000	$ 135,688,000	$ 146,964,000	$ 202,121,000
Impairments of investments	$ 0	$ 0	$ 0	$ 0
Number of investments in unconsolidated affiliates | investment	2		2
Malls
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Impairment charges of real estate			$ 146,964,000
Number of malls with impairment | mall			3
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			5

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Number of investments in unconsolidated affiliates.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 35
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=121548190&loc=d3e32787-111569

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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

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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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