Subsequent Events - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended	6 Months Ended	0 Months Ended			6 Months Ended	0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	May 09, 2014 Dividend Declared [Member]	Jun. 30, 2014 Dividend Declared [Member]	Jul. 10, 2014 Subsequent Event [Member] Dividend Paid [Member] Common Stock [Member]	Jul. 10, 2014 Subsequent Event [Member] Dividend Paid [Member] Capital Units [Member]	Aug. 04, 2014 Subsequent Event [Member] Dividend Declared [Member]	Jun. 30, 2014 Operating Partnership [Member]	Jul. 14, 2014 Operating Partnership [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Revolving credit facility, borrowed amount										$ 18,000,000	$ 5,000,000
Dividends paid			$ 10,441,000				$ 3,100,000	$ 2,200,000
Cash dividend/distribution per share, declared	$ 0.16	$ 0.08	$ 0.32	$ 0.08	$ 0.16				$ 0.16
Cash dividend/distribution, date declared						May 09, 2014			Aug. 04, 2014
Cash dividend/distribution, date of record						Jul. 01, 2014			Oct. 01, 2014