Equity Capital - Additional Information (Detail) (Series A Preferred Stock [Member], USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Stockholders' Equity [Line Items]
Preferred stock par value per share	$ 0.10	$ 0.10
Preferred stock quarterly dividends, amount	$ 625,000
Preferred stock quarterly dividends rate	5.00%
Increase in dividend after five years	9.00%
Scenario, Forecast [Member]
Stockholders' Equity [Line Items]
Preferred stock quarterly dividends, amount	$ 1,125,000
Period from date of issuance of stock for increase in dividends	5 years