Subsequent Events - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended			1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Property	Sep. 30, 2012 Property	Dec. 31, 2012 Property	Jul. 19, 2013	Dec. 14, 2011	Nov. 01, 2013 Subsequent Event Parcels Property
Subsequent Event [Line Items]
Paid off and retired a secured mortgage loan			$ 50,565	$ 21,468				$ 31,966
Ownership interest acquired								100.00%
Number of industrial properties acquired			1					1
Purchase price of acquisitions	46,463		46,463					26,349
Payments for repurchase of redeemable preferred stock			150,000	0
Line of credit facility, maximum borrowing capacity						625,000	450,000
Line of credit facility, increase, additional borrowings			825,000
Line of credit facility, interest rate description			145
Number of years of extension of line of credit facility at election			1 year
Number of industrial properties sold			19	25	28			3
Number of land parcels sold								1
Proceeds from sale of industrial properties and land parcel								4,644
Write-off of Unamortized Settlement Amounts of Interest Rate Protection Agreements	$ (662)	$ (424)	$ (6,248)	$ (6,646)