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Significant Accounting Policies - Reclassification Out Of AOCI, Simon Property Group, L.P. (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Significant Accounting Policies      
Total accumulated other comprehensive income (loss) $ (180,900)   $ (160,400)
Interest expense (187,627) $ (198,733)  
Simon Property Group, L.P.      
Significant Accounting Policies      
Total accumulated other comprehensive income (loss) (208,400)   $ (184,800)
Interest expense (187,627) (198,733)  
Simon Property Group, L.P. | Amount reclassified from accumulated other comprehensive income (loss)      
Significant Accounting Policies      
Interest expense $ 480 $ (1,088)