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Combined Guarantor Subsidiaries - Revenues - Disaggregation of Revenue (Details) - 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]                      
Revenues from contracts with customers (ASC 606):                 $ 25,192,000 $ 25,262,000  
Total revenues $ 190,038,000 $ 187,251,000 $ 193,377,000 $ 198,030,000 $ 216,881,000 $ 206,878,000 $ 214,598,000 $ 220,200,000 768,696,000 [1] 858,557,000 [1] $ 927,252,000 [1]
Malls                      
Disaggregation Of Revenue [Line Items]                      
Total revenues [1]                 699,698,000 783,194,000 847,979,000
All Other                      
Disaggregation Of Revenue [Line Items]                      
Total revenues [1],[2]                 68,998,000 75,363,000 79,273,000
Operating expense reimbursements                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 9,783,000 8,434,000  
Operating expense reimbursements | Malls                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 9,404,000 5,873,000  
Marketing revenues                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 6,059,000 6,286,000  
Marketing revenues | Malls                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                   6,255,000  
Other revenues                      
Disaggregation Of Revenue [Line Items]                      
Total revenues                 6,626,000 4,182,000  
Guarantor Subsidiaries                      
Disaggregation Of Revenue [Line Items]                      
Rental revenues                 277,452,000 311,804,000 343,527,000
Total revenues $ 73,803,000 $ 69,328,000 $ 68,868,000 $ 72,991,000 $ 81,241,000 $ 78,655,000 $ 78,591,000 $ 80,438,000 284,990,000 318,925,000 344,057,000
Guarantor Subsidiaries | Malls                      
Disaggregation Of Revenue [Line Items]                      
Total revenues                 274,772,000 308,193,000 333,247,000
Guarantor Subsidiaries | All Other                      
Disaggregation Of Revenue [Line Items]                      
Total revenues                 10,218,000 10,732,000 $ 10,810,000
Guarantor Subsidiaries | Operating expense reimbursements                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 4,045,000 3,914,000  
Guarantor Subsidiaries | Operating expense reimbursements | Malls                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 4,039,000 3,880,000  
Guarantor Subsidiaries | Operating expense reimbursements | All Other                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 6,000 34,000  
Guarantor Subsidiaries | Marketing revenues                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 2,760,000 2,673,000  
Guarantor Subsidiaries | Total Revenue                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 6,805,000 6,587,000  
Guarantor Subsidiaries | Other revenues                      
Disaggregation Of Revenue [Line Items]                      
Other revenues                 $ 733,000 $ 534,000  
[1] Management, development and leasing fees are included in All Other category. See Note 3 for information on the Company’s revenues disaggregated by revenue source for each of the above segments.
[2] The All Other category includes associated centers, community centers, mortgage and other notes receivable, office buildings, self-storage facilities, corporate-level debt and the Management Company.