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Quarterly Financial Data (Unaudited): (Details) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
SDG Macerich Properties, L. P.
Dec. 31, 2011
SDG Macerich Properties, L. P.
Dec. 31, 2010
SDG Macerich Properties, L. P.
Dec. 31, 2009
SDG Macerich Properties, L. P.
Quarterly Financial Data (Unaudited):                              
Revenues $ 215,315,000 $ 202,683,000 $ 190,940,000 $ 191,069,000 $ 200,334,000 $ 189,471,000 $ 181,226,000 $ 182,114,000 $ 791,250,000 $ 743,393,000 $ 793,048,000        
Net income (loss) available to common stockholders 163,107,000 12,941,000 (19,216,000) 34,000 23,558,000 8,429,000 (440,000) (6,357,000) 156,866,000 25,190,000 120,742,000        
Net income (loss) available to common stockholders per share-basic (in dollars per share) $ 1.23 $ 0.10 $ (0.15)   $ 0.18 $ 0.06 $ (0.01) $ (0.08) $ 1.18 $ 0.19 $ 1.45        
Net income (loss) available to common stockholders per share-diluted (in dollars per share) $ 1.23 $ 0.10 $ (0.15)   $ 0.18 $ 0.06 $ (0.01) $ (0.08) $ 1.18 $ 0.19 $ 1.45        
Impairment loss related to the reduction of the expected holding period of certain long-lived assets                 45,458,000            
Quarterly Financial Data (Unaudited)                              
Remeasurement gain on acquisition of additional interest                 $ 389,707,000 $ 576,000 $ (3,016,000) $ 188,264 $ 366,312,000 $ 6,000 $ (931,000)