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Indebtedness - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Debt Disclosure [Line Items] |  |
Mortgage Loans Paid Off And Retired Prior to Maturity | $ 14,283 |
Gains (Losses) on Extinguishment of Debt | (1,150) | 1
Carrying value of industrial properties held under mortgage and other loan | 927,157 |
2028 Notes [Member] |  |
Debt Disclosure [Line Items] |  |
Gains (Losses) on Extinguishment of Debt | 779 |
Purchase Price Senior Unsecured Notes | 4,566 |
Principal Amount of Senior Notes Repurchased | 4,000 |
Unamortized debt issue discount | 2 |
Unamortized Deferred Financing Cost, Wrote Off | 28 |
Unamortized settlement amount of interest rate protection agreements | 183 |
Mortgages [Member] |  |
Debt Disclosure [Line Items] |  |
Gains (Losses) on Extinguishment of Debt | $ 371 |

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