Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended	9 Months Ended	1 Months Ended		0 Months Ended
	Aug. 09, 2013	Jul. 11, 2013	Sep. 30, 2013	Jul. 11, 2013 Common Stockholders	Jul. 11, 2013 Common Unitholders	Oct. 10, 2013 Subsequent Event	Oct. 10, 2013 Subsequent Event Common Stockholders	Oct. 10, 2013 Subsequent Event Common Unitholders
Schedule Of Significant Accounting Policies [Line Items]
Common units issued			13,059,365
Percentage of Operating Partnership held			59.50%
Cash dividend paid, per share		$ 0.08
Dividends paid			$ 2,578,000	$ 1,500,000	$ 1,100,000	$ 5,200,000	$ 3,100,000	$ 2,100,000
Cash dividend declared, per share	$ 0.16
Cash dividend declared, payable date	Oct. 10, 2013
Cash dividend declared, record date	Oct. 01, 2013
Dividend payable			$ 5,200,000