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Combined Guarantor Subsidiaries - Fair Value Measurements - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) mall	Dec. 31, 2018 USD ($) mall	Dec. 31, 2017 USD ($) mall
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of mortgage and other indebtedness	$ 2,970,246,000	$ 3,740,431,000
Loss on impairment	$ 239,521,000	$ 174,529,000	$ 71,401,000
Number of malls with impairment | mall	6	5	2
Guarantor Subsidiaries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of mortgage and other indebtedness	$ 202,772,000	$ 319,222,000
Loss on impairment	$ 60,170,000	$ 0	$ 43,007,000
Number of malls with impairment | mall	2		1

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Number of Malls with Impairment

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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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- 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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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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