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