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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
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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

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