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Investments in Unconsolidated Joint Ventures: (Details 2) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jun. 30, 2011
GGP Exchange
store
Jun. 03, 2011
GGP Exchange
Jun. 30, 2011
Superstition Springs Land
Dec. 31, 2011
Superstition Springs Land
Jun. 03, 2011
Superstition Springs Land
Feb. 28, 2011
Desert Sky Mall
squarefoot
Dec. 31, 2011
Desert Sky Mall
Dec. 31, 2011
Eastland Mall
Dec. 31, 2011
Lake Square Mall
Dec. 31, 2011
South Park Mall
Dec. 31, 2011
South Ridge Mall
Dec. 31, 2011
Northpark Mall
Dec. 31, 2011
Valley Mall
Jul. 31, 2009
Queens Center
Dec. 31, 2009
Queens Center
Sep. 30, 2009
FlatIron Crossing
warrant
Dec. 31, 2009
FlatIron Crossing
Dec. 31, 2011
FlatIron Crossing
Feb. 28, 2011
Kierland Commons
squarefoot
Dec. 31, 2011
Kierland Commons
Feb. 24, 2011
Kierland Commons
Feb. 28, 2011
The Shops at Atlas Park
squarefoot
Dec. 31, 2011
SDG Macerich Properties, L. P.
shoppingcenter
Apr. 30, 2011
SDG Macerich Properties, L. P.
Dec. 31, 2011
SDG Macerich Properties, L. P.
shoppingcenter
Dec. 31, 2010
SDG Macerich Properties, L. P.
Dec. 31, 2009
SDG Macerich Properties, L. P.
Dec. 30, 2011
SDG Macerich Properties, L. P.
Jun. 30, 2011
Arrowhead Towne Center
Jun. 03, 2011
Arrowhead Towne Center
Jun. 30, 2011
Superstition Springs Center
Dec. 31, 2011
Superstition Springs Center
Jun. 03, 2011
Superstition Springs Center
Investments in unconsolidated joint ventures:                                                                        
Percentage of ownership interest sold                                 49.00% 49.00% 75.00% 75.00%                                
Number of warrants issued                                     3                                  
Consideration received on sale of joint venture interest                                 $ 152,654,000   $ 123,750,000                                  
Gain on sale of investments in unconsolidated entity                                 154,156,000 154,156,000 2,506,000 2,506,000                                
Proceeds from sale of interest in joint venture attributed to warrants issued     14,503,000                               8,068,000                                  
Net sale proceeds in excess of carrying amount of interest sold                                     28,720,000                                  
Unrecognized gain on sale of joint venture interests                                     26,214,000                                  
Property square footage (in square feet)                 893,863                         434,642     377,924                      
Total purchase price                                               105,550,000 53,750,000                      
Purchase price on acquisition                 27,625,000                                                      
Purchase price paid in cash by the Company                                           34,161,000                            
Purchase price funded by cash payment on acquisition         75,000,000       1,875,000                                                      
Purchase price paid through assumption of debt by the Company 192,566,000               25,750,000                         18,613,000                            
Percentage ownership before additional interest acquired                                               24.50%                        
Number of Mervyn's stores exchanged       5                                                                
Ownership percentage in joint ventures                                         25.00%     50.00% 50.00% 50.00%   50.00%         66.70%   66.70% 66.70%
Ownership percentage in joint ventures               100.00% 100.00%   100.00% 100.00% 100.00% 100.00% 100.00% 100.00%                             50.00%          
Other joint venture partners' ownership percentage in joint ventures                                                 50.00%                      
Remeasurement gain on acquisition of additional interest 389,707,000 576,000 (3,016,000)                                       25,019,000     188,264   366,312,000 6,000 (931,000)            
Remeasurement gain on acquisition of additional interest, pro rata share                                             12,510,000                          
Company's share of total purchase price                                                 26,875,000                      
Additional ownership interest acquired (as a percent)           50.00%     50.00%                                             33.30%   33.30%    
Loan paid off                 51,500,000                                                      
Share of gain on conveyance of Granite Run Mall through deed-in-lieu foreclosure                                                     7,753,000                  
Number of anchor locations exchanged       6                                                                
Gain on purchase of remaining interest in property           $ 1,734,000 $ 1,734,000   $ 1,868,000 $ 1,868,000                                                    
Number of regional shopping centers owned by investee                                                   11                    
Number of assets distributed to the Company                                                   6                    
Number of regional malls distributed by the investee to the outside partner                                                       5