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Summary of Significant Accounting Policies - Rollforward Of Noncontrolling Interest, Simon Group Property, Inc. (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Noncontrolling interests:    
Noncontrolling interests, beginning of period $ 500,275 $ 552,596
Net income attributable to noncontrolling interests after preferred distributions and income attributable to redeemable noncontrolling interests in consolidated properties 83,224 94,176
Distributions to noncontrolling interest holders (96,562) (92,012)
Other comprehensive (loss) income allocable to noncontrolling interests:    
Unrealized gain (loss) on derivative hedge agreements 1,227 (804)
Net loss reclassified from accumulated other comprehensive loss into earnings 143 283
Currency translation adjustments (614) 1,663
Changes in available-for-sale securities and other 19 (38)
Other comprehensive income (loss) 775 1,104
Adjustment to limited partners' interest from change in ownership in the Operating Partnership (4,167) (36,221)
Units exchanged for common shares (253) (70)
Units redeemed (8) (474)
Long-term incentive performance units 3,701 8,307
Contributions by noncontrolling interests, net, and other (2) 24
Noncontrolling interests, end of period $ 486,983 $ 527,430