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