Indebtedness - Mortgage Loans Originated (Detail) (Mortgage Financing I-V, USD $)	12 Months Ended
	Dec. 31, 2012 sqft Property
Mortgage Financing I-V
Mortgage Loans on Real Estate [Line Items]
Loan Principal	$ 97,561,000
Interest Rate	4.03%
Origination /Assumption Date	Aug. 29, 2012
Maturity Date	Sep. 01, 2022
Amortization Period	30 years
Number of Industrial Properties Collateralizing Mortgage	30
GLA	3,700,000
Property Carrying Value	$ 100,443,000