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Subsequent Events - Additional Information (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 3 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Apr. 30, 2013
Subsequent Events [Member]
Business Acquisitions [Member]
PrimePowerCenter
Apr. 30, 2013
Subsequent Events [Member]
Common Shares [Member]
Apr. 30, 2013
Class K cumulative redeemable preferred shares [Member]
Subsequent Events [Member]
Mar. 31, 2013
Class H cumulative redeemable preferred shares [Member]
May 31, 2013
Class H cumulative redeemable preferred shares [Member]
Subsequent Events [Member]
Jun. 30, 2013
Class H cumulative redeemable preferred shares [Member]
Subsequent Events [Member]
Subsequent Event [Line Items]              
Issue of cumulative redeemable preferred shares       $ 150,000,000 $ 205,000,000    
Preferred stock dividend rate       6.25%   7.375%  
Cumulative redeemable preferred shares redemption price per share       $ 500.00   $ 500.00  
Cumulative redeemable preferred shares redemption price depository share       $ 25.00   $ 25.00  
Accrued and unpaid dividends per Class H Preferred Share           $ 2.2535  
Accrued and unpaid dividends per depositary share           $ 0.1127  
Write-off of preferred share original issuance costs             5,200,000
Cumulative redeemable preferred shares redeemed, value           150,000,000  
Percentage of ownership acquired   85.00%          
Number of prime power centers   5          
Purchase price of acquired entities   93,900,000          
Number of common shares issued 2.3   2.5        
Weighted-average price of common shares $ 17.57   $ 17.83        
Gross proceeds $ 40,000,000   $ 45,000,000