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Indebtedness - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Jul. 19, 2013 | Dec. 14, 2011
Debt Disclosure [Line Items] |  |  |  |  |  |
Loss from Retirement of Debt | $ (662) | $ (424) | $ (6,248) | $ (6,646) |  |
Principal amount of senior unsecured notes repurchased |  |  | 29,824 |  |  |
Purchase price of senior unsecured notes |  |  | 33,492 |  |  |
Unamortized deferred financing cost, wrote off |  |  | 56 |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | 625,000 | 450,000
Line of credit facility, increase, additional borrowings |  |  | 825,000 |  |  |
Number of years of extension of line of credit facility at election |  |  | 1 year |  |  |
Line of credit facility, interest rate description |  |  | 145 |  |  |
Mortgages |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Mortgage loans paid off and retired prior to maturity | 14,046 |  | 40,295 |  |  |
Loss from Retirement of Debt | 486 |  | 1,189 |  |  |
Carrying value of industrial properties held under mortgage | 869,442 |  | 869,442 |  |  |
Unsecured Debt |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Loss from Retirement of Debt |  |  | 5,003 |  |  |
Principal amount of senior unsecured notes repurchased |  |  | 29,824 |  |  |
Purchase price of senior unsecured notes |  |  | 33,492 |  |  |
Unamortized debt issue discount |  |  | 28 |  |  |
Unamortized deferred financing cost, wrote off |  |  | 191 |  |  |
Unamortized settlement amount of interest rate protection agreements |  |  | $ 1,116 |  |  |

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