Acquisition of Non-controlled Entities - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
	May 13, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Business Acquisition [Line Items]
Percentage of operating partnership acquired	100.00%
Gain loss from remeasurment of equity mehtod investement	$ 9,500,000
Proforma Rental revenue	2,300,000	14,899,000	14,767,000	44,538,000	44,564,000
Proforma net income	(300,000)	1,448,000	1,863,000	2,667,000	15,233,000
Pro Forma
Business Acquisition [Line Items]
Gain loss from remeasurment of equity mehtod investement	9,500,000
Smith's Landing
Business Acquisition [Line Items]
Ownership percentage of acquired non-controlled entities	60.00%
Acquitions, Consideration in the form of cash and common units	7,500,000
Acquisition-date fair values of equity interests	5,000,000
Smith's Landing | Predecessor
Business Acquisition [Line Items]
Ownership percentage of acquired non-controlled entities	40.00%
Smith's Landing | Intangible Assets
Business Acquisition [Line Items]
Acquisition, below-market ground lease	1,900,000
Acquisition, in-place leases	500,000
Bermuda Crossroads
Business Acquisition [Line Items]
Ownership percentage of acquired non-controlled entities	50.00%
Acquitions, Consideration in the form of cash and common units	3,200,000
Acquisition, below-market ground lease	1,750,000
Fair value adjustment to assumed secured debt	200,000
Acquisition-date fair values of equity interests	$ 3,200,000
Bermuda Crossroads | Predecessor
Business Acquisition [Line Items]
Ownership percentage of acquired non-controlled entities	50.00%