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Combined Guarantor Subsidiaries - Revenues - Disaggregation of Revenue (Details) - Guarantor Subsidiaries - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation Of Revenue [Line Items]                      
Rental revenues                 $ 277,452,000 [1] $ 311,804,000 [1] $ 343,527,000
Revenue $ 73,803,000 $ 69,328,000 $ 68,868,000 $ 72,991,000 $ 81,241,000 $ 78,655,000 $ 78,591,000 $ 80,438,000 284,990,000 [2] 318,925,000 [2] 344,057,000
Malls                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 274,772,000 308,193,000 333,247,000
All Other                      
Disaggregation Of Revenue [Line Items]                      
Revenue [3]                 10,218,000 10,732,000 $ 10,810,000
Operating expense reimbursements                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606): [4]                 4,045,000 3,914,000  
Operating expense reimbursements | Malls                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 4,039,000 3,880,000  
Operating expense reimbursements | All Other                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 6,000 34,000  
Marketing revenues                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606): [5]                 2,760,000 2,673,000  
Total Revenue                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 6,805,000 6,587,000  
Other revenues                      
Disaggregation Of Revenue [Line Items]                      
Other revenues                 $ 733,000 $ 534,000  
[1] Revenues from leases that commenced subsequent to December 31, 2018 are accounted for in accordance with ASC 842, Leases , whereas all leases existing prior to that date are accounted for in accordance with ASC 840, Leases . See Note 4 .
[2] Sales taxes are excluded from revenues.
[3] The All Other category includes associated centers and notes receivable.
[4] Includes $ 4,039 in the Malls segment and $ 6 in the All Other segment in 2019 and includes $ 3,880 in the Malls segment and $ 34 in the All Other segment in 2018.
[5] Marketing revenues solely relate to the Malls segment for all periods presented. See description below.