Subsequent Events - Additional Information (Detail) (USD $)			1 Months Ended
	Dec. 31, 2012	Apr. 15, 2013 Dividend Undeclared Class A Preferred Stock	Apr. 30, 2013 Dividend Declared Class A Preferred Stock
Subsequent Event [Line Items]
Preferred dividend required payment	$ 391,875	$ 391,875
Dividends declared, record date			Mar. 31, 2013