Indebtedness - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Debt Disclosure [Line Items]
Loss from Retirement of Debt	$ (4,436)	$ (6,223)	$ (5,586)	$ (6,222)
Principal amount of senior unsecured notes repurchased			29,019
Purchase price of senior unsecured notes			32,588
Mortgages
Debt Disclosure [Line Items]
Mortgage loans paid off and retired prior to maturity	11,966		26,249
Loss from Retirement of Debt	332		703
Carrying value of industrial properties held under mortgage	901,462		901,462
Unsecured Debt
Debt Disclosure [Line Items]
Loss from Retirement of Debt			4,883
Principal amount of senior unsecured notes repurchased			29,019
Purchase price of senior unsecured notes			32,588
Unamortized debt issue discount			27
Unamortized deferred financing cost, wrote off			188
Unamortized settlement amount of interest rate protection agreements			$ 1,099