Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jan. 08, 2015	Jan. 28, 2015	Apr. 09, 2015	Apr. 08, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Authorized capital shares of common stock	500,000,000						500,000,000
Authorized capital shares of preferred stock	100,000,000						100,000,000
Shares of common stock issued	25,084,139						25,022,701
Shares of common stock outstanding	25,084,139						25,022,701
Preferred stock issued	0						0
Preferred stock outstanding	0						0
Percentage of Operating Partnership held	62.90%						62.90%
Aggregate cash dividends and distributions, paid	$ 6,368	$ 5,155
Cash dividend per share, declared	$ 0.17	$ 0.16
Common Stockholders [Member]
Class of Stock [Line Items]
Aggregate cash dividends and distributions, paid			4,000
Common Unitholders [Member]
Class of Stock [Line Items]
Aggregate cash dividends and distributions, paid			2,400
Dividend Declared [Member]
Class of Stock [Line Items]
Cash dividend per share, declared				$ 0.17
Cash dividend, date of record	Apr. 01, 2015
Subsequent Event [Member] | Common Stockholders [Member]
Class of Stock [Line Items]
Aggregate cash dividends and distributions, paid					4,300
Subsequent Event [Member] | Common Unitholders [Member]
Class of Stock [Line Items]
Aggregate cash dividends and distributions, paid					$ 2,500
Subsequent Event [Member] | Perry Hall Marketplace [Member]
Class of Stock [Line Items]
Acquisition, common stock issued						415,500