Indebtedness - Mortgage Loans Obtained (Detail) (Mortgage Financing I - VI, USD $)	12 Months Ended
	Dec. 31, 2012 sqft Property
Mortgage Financing I - VI
Mortgage Loans on Real Estate [Line Items]
Loan Principal	$ 100,599,000
Interest Rate	4.03%
Origination Date	Aug. 29, 2012
Maturity Date	Sep. 01, 2022
Amortization Period	30 years
Number of Industrial Properties Collateralizing Mortgage	31
GLA	3,800,000
Property Carrying Value	$ 103,671,000