Subsequent Events - Additional Information (Detail) (USD $)	3 Months Ended		0 Months Ended	3 Months Ended				0 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Feb. 18, 2014 Dividend Declared [Member]	Mar. 31, 2014 Dividend Declared [Member]	Mar. 31, 2014 Operating Partnership [Member]	May 01, 2014 Subsequent Event [Member] Virginia [Member]	Apr. 16, 2014 Subsequent Event [Member] Virginia [Member]	Apr. 10, 2014 Subsequent Event [Member] Dividend Paid [Member] Common Stock [Member]	Apr. 10, 2014 Subsequent Event [Member] Dividend Paid [Member] Capital Units [Member]	May 09, 2014 Subsequent Event [Member] Dividend Declared [Member]	Apr. 14, 2014 Subsequent Event [Member] Operating Partnership [Member]
Subsequent Event [Line Items]
Purchase of land	$ 44,893,000	$ 41,313,000				$ 300,000	$ 7,400,000
Revolving credit facility, borrowed amount					10,000,000						8,000,000
Dividends paid	$ 5,155,000							$ 3,100,000	$ 2,200,000
Cash dividend/distribution per share, declared	$ 0.16		$ 0.16							$ 0.16
Cash dividend/distribution, date declared				Feb. 18, 2014						May 09, 2014
Cash dividend/distribution, date of record				Apr. 01, 2014						Jul. 01, 2014