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Combined Guarantor Subsidiaries - Organization and Basis of Presentation - Narrative (Details) - Guarantor Subsidiaries	Dec. 31, 2019 USD ($) state mall associated_center subsidiary mortgage_note_receivable senior_unsecured_note	Jan. 01, 2019 USD ($)
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]
Number of states in which entity operates | state	26
Number of malls securing the credit facility | mall	17
Number of associated centers securing the credit facility | associated_center	3
Number of wholly owned subsidiaries | subsidiary	36
Number of malls not classified as collateral for the secured credit facility | mall	5
Number of associated centers not classified as collateral for the secured credit facility | associated_center	2
Number of mortgage notes receivable not classified as collateral for the secured credit facility | mortgage_note_receivable	4
Line of Credit | Secured Debt
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]
Balance of Non-recourse Debt | $	$ 1,185,000,000	$ 1,185,000,000
Senior Unsecured Notes
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]
Balance of Non-recourse Debt | $	$ 1,375,000,000
Number of debt instruments | senior_unsecured_note	3

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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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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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