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Subsequent Events - Additional Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended 2 Months Ended 3 Months Ended
Dec. 31, 2012
Parcels
Property
Dec. 31, 2011
Parcels
sqft
Dec. 31, 2010
Property
Parcels
Dec. 31, 2012
Series F Preferred Stock [Member]
Dec. 31, 2011
Series F Preferred Stock [Member]
Dec. 31, 2010
Series F Preferred Stock [Member]
Dec. 31, 2012
Series G Preferred Stock [Member]
Dec. 31, 2011
Series G Preferred Stock [Member]
Dec. 31, 2010
Series G Preferred Stock [Member]
Feb. 28, 2013
Subsequent Event [Member]
Property
Parcels
Land_Parcel
Mar. 31, 2013
Subsequent Event [Member]
Mar. 31, 2013
Subsequent Event [Member]
Series J And Series K Preferred Stock [Member]
Mar. 31, 2013
Subsequent Event [Member]
Series F Preferred Stock [Member]
Mar. 31, 2013
Subsequent Event [Member]
Series G Preferred Stock [Member]
Subsequent Event [Line Items]                            
Number of industrial properties sold 28 36 13             1        
Number of land parcels sold 1 1 1             1        
Proceeds from sale of industrial property and land parcel $ 85,561 $ 86,643 $ 71,019             $ 2,565        
Number of Land Parcel Acquired                   1        
Payments for purchase of land parcel excluding the acquisition related costs 46,695                 6,250        
Senior unsecured notes repurchased and retired face amount                   4,000        
Amount paid on senior unsecured notes repurchased and retired                   $ 4,565        
Debt instrument maturity period                   2028        
Common dividend per share for shareholders $ 0.00 $ 0.00 $ 0.00               $ 0.085      
Dividend payable date of record                     Mar. 28, 2013 Mar. 15, 2013 Mar. 29, 2013 Mar. 29, 2013
Dividend payable date                     Apr. 15, 2013 Apr. 01, 2013 Apr. 01, 2013 Apr. 01, 2013
Preferred dividend per depositary share       $ 5,455.88910 $ 6,510.90280 $ 6,736.15400 $ 7,236.00000 $ 7,236.00000 $ 7,236.00000     $ 0.45313 $ 13.3125 $ 36.18