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Indebtedness - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended			9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 I - VI [Member]	Sep. 30, 2012 Tender Offer Repurchases [Member]	Mar. 29, 2012 Tender Offer Repurchases [Member]	Apr. 16, 2012 2012 Notes [Member]	Sep. 30, 2012 2028 Notes [Member]	Sep. 30, 2012 2028 Notes [Member] Senior Unsecured Debt Repurchase [Member]	Sep. 30, 2012 2017 Notes [Member] Senior Unsecured Debt Repurchase [Member]	Sep. 30, 2012 2017 Notes [Member] Senior Unsecured Debt Repurchase [Member]
Debt Disclosure [Line Items]
Principal prepayments, prohibition period					12 months
Percentage of outstanding balance for calculating prepayment premium					1.00%
Carrying value of industrial properties held under mortgage and other loan	$ 976,321		$ 976,321
Letter of credit, amount	537		537
Amount of notes paid off and retired at maturity								61,829
Gain/Loss on retirement of debt	(424)	(345)	(6,646)	(4,604)		6,223				1	424	424
Purchase price senior unsecured notes			93,960			88,922			57,041	406		4,632
Principal amount repurchased			91,578			86,925			55,955	430		4,223
Unamortized loan commitment and origination fee						609				3		13
Unamortized settlement amount of interest rate protection agreements						2,599				20
Maximum aggregate cash tender offer price							100,000
Unamortized debt issue discount						578						2
Professional Service Fee						$ 440

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Maximum aggregate cash tender offer price.

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Prohibition period for principal prepayments of mortgage financings after loan origination.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for letter of credit arrangements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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