Summary of Significant Accounting Policies - Noncontrolling Interests, Simon Property Group, Inc. (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Significant Accounting Policies
Limited partners' interests in the Operating Partnership	$ 459,316	$ 447,494
Nonredeemable noncontrolling interests in properties, net	19,175	21,321
Total noncontrolling interests reflected in equity	$ 478,491	$ 468,815