Summary of Significant Accounting Policies - Noncontrolling Interests, Simon Property Group, Inc. (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Significant Accounting Policies
Limited partners' interests in the Operating Partnership	$ 402,919	$ 447,494
Nonredeemable noncontrolling interests in properties, net	23,302	21,321
Total noncontrolling interests reflected in equity	$ 426,221	$ 468,815