Company's Identified Intangible Assets (Detail) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Leases in-place - including above market leases of $2.7	$ 7,700,000	$ 7,700,000
Accumulated amortization	(1,200,000)	(800,000)
Total	$ 6,466,000	$ 6,939,000