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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, 2018
Mar. 31, 2017
Noncontrolling interests:    
Noncontrolling interests, beginning of period $ 552,596 $ 649,464
Net income attributable to noncontrolling interests after preferred distributions and income attributable to redeemable noncontrolling interests in consolidated properties 94,176 72,945
Distributions to noncontrolling interest holders (92,012) (84,221)
Other comprehensive (loss) income allocable to noncontrolling interests:    
Unrealized loss on derivative hedge agreements (804) (143)
Net loss reclassified from accumulated other comprehensive loss into earnings 283 345
Currency translation adjustments 1,663 1,618
Changes in available-for-sale securities and other (38) 101
Other comprehensive income (loss) 1,104 1,921
Adjustment to limited partners' interest from change in ownership in the Operating Partnership (36,221) (33,235)
Units exchanged for common shares (70) (12)
Units redeemed (474)  
Long-term incentive performance units 8,307 14,705
Contributions by noncontrolling nonredeemable interests, net, and other 24 171
Noncontrolling interests, end of period $ 527,430 $ 621,738