Per Unit Data (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Per Unit Data
Net Income attributable to Unitholders - Basic	$ 399,267	$ 330,694
Net Income attributable to Unitholders - Diluted	399,267	330,694
Weighted Average Units Outstanding - Basic (in shares)	363,008,959	362,051,682
Effect of stock options of Simon Property (in shares)		203
Weighted Average Units Outstanding - Diluted (in shares)	363,008,959	362,051,885
Effect of dilutive securities:
Securities with dilutive effect	$ 0