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Subsequent Events - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
 9 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Sep. 30, 2013
May 31, 2013
Senior Unsecured Notes Due May 2023 [Member]
Sep. 30, 2013
Forward Sale [Member]
Oct. 31, 2013
Subsequent Events [Member]
ShoppingCenter
Oct. 31, 2013
Subsequent Events [Member]
Senior Unsecured Notes Due May 2023 [Member]
Oct. 31, 2013
Subsequent Events [Member]
Forward Sale [Member]
Oct. 31, 2013
Subsequent Events [Member]
Preferred Equity Interest and Mezzanine Loan [Member]
Subsequent Event [Line Items]              
Number of prime power centers acquired       30      
Transaction value for sole ownership interest acquired       $ 1,460,000,000      
Total Transaction value for sole ownership interest acquired       1,540,000,000      
Ownership interest acquired cash paid 306,100,000     566,400,000      
Notes maturity date   May 31, 2023     May 31, 2023    
Sale of common shares     39.1     39.1  
Sole ownership interest acquired, mortgage debt assumed that was repaid at closing       139,000,000      
Preferred equity and Mezzanine loan repaid       148,800,000     148,800,000
Ownership interest percentage       100.00%      
Ownership interest of joint venture partner       95.00%      
Sole ownership interest acquired, mortgage debt assumed       792,900,000      
Sole ownership interest acquired, cash deposit paid $ 25,000,000            
Interest rate of Notes   3.375%