v3.26.1
Significant Accounting Policies - Reclassification Out Of AOCI, Simon Property Group, L.P. (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Summary of Significant Accounting Policies      
Total accumulated other comprehensive income (loss) $ (263,800)   $ (278,300)
Interest expense (275,662) $ (226,995)  
Simon Property Group, L.P      
Summary of Significant Accounting Policies      
Total accumulated other comprehensive income (loss) (309,400)   $ (326,000)
Interest expense (275,662) (226,995)  
Accumulated derivative gains (losses), net | Simon Property Group, L.P | Amount reclassified from accumulated other comprehensive income (loss)      
Summary of Significant Accounting Policies      
Interest expense $ 1,706 $ 1,455