Real Estate Acquired and Sold - Additional Information (Detail) (USD $)	1 Months Ended				1 Months Ended			0 Months Ended	1 Months Ended
	Aug. 31, 2013 Kentlands Pad sqft	Dec. 31, 2013 Hunt Club Pad sqft	Jan. 31, 2014 1580 Rockville Pike sqft	Jan. 31, 2014 1580 Rockville Pike In-place Lease	Apr. 30, 2014 1582 Rockville Pike	Apr. 24, 2014 1582 Rockville Pike sqft	Apr. 30, 2014 1582 Rockville Pike In-place Lease	Apr. 24, 2014 Olney Center sqft	Apr. 30, 2014 Olney Center	Apr. 30, 2014 Giant Center sqft	Mar. 31, 2014 Giant Center
Business Acquisition [Line Items]
Name of property	Kentlands Pad	Hunt Club Pad	1580 Rockville Pike						Olney Center	Giant Center
Purchase price	$ 4,300,000	$ 800,000	$ 8,000,000		$ 11,000,000
Property type	retail pad	retail pad
Area of real estate property (in sq ft)	7,100	5,500	12,100			40,700		53,765		70,040
Location of property	Gaithersburg, Maryland	Apopka, Florida	Rockville, Maryland		Rockville, Maryland				Olney, Maryland	Milford Mill, Maryland
Property acquisition costs	99,000		163,000			200,000
Remaining life of the lease			10 years
Purchase Price Allocation:
Land			9,600,000		9,742,000
Building			2,200,000		828,000
In-place lease				513,000			849,000
Below-market rents			(4,313,000)		(419,000)
Total acquisition cost			8,000,000
Lease term									P20Y
Sale leaseback, option to purchase the property								14,600,000	14,600,000
Proceeds from sale of real estate								11,000,000	11,000,000	7,500,000
Assets held-for-sale											500,000
Sales price of property									11,000,000
Annual increase in rental payments, percentage								1.50%	1.50%
Gain on sale of real estate										6,100,000
Liabilities of assets held-for-sale											$ 100,000