Shareholder's Equity - Additional Information (Detail) (USD $)	1 Months Ended		6 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended				1 Months Ended
	Apr. 20, 2012	Aug. 31, 2011	Jun. 30, 2012	Sep. 30, 2011 Series A Convertible 10% Cumulative Preferred Stock	Jun. 30, 2012 Series A Convertible 10% Cumulative Preferred Stock	Dec. 31, 2010 Series A Convertible 10% Cumulative Preferred Stock	Dec. 31, 2011 Series A Convertible 10% Cumulative Preferred Stock	Jun. 30, 2012 Series B Convertible 8.4% Noncumulative Preferred Stock	Dec. 31, 2011 Series B Convertible 8.4% Noncumulative Preferred Stock	Aug. 26, 2011 Series B Convertible 8.4% Noncumulative Preferred Stock Institutional Investors
Stockholders Equity Note [Line Items]
Number of preferred Shares converted				115,500	11,000
Price per share of converted preferred stock				$ 7.65	$ 7.65
Common shares issued upon conversion of convertible preferred stock				1,510,238	143,790
Common stocks issued in payment of unpaid dividends accumulated on Series A shares				328,100	37,272
Number of Series A preferred Shares issued						126,500	11,000	112,000	112,000
Proceed from issuance of Series A preferred Shares issued		$ 11,200,000				$ 12,655,000
Number of shares issued during period	4,201,278									112,000
Shares issued during period, value			24,591,000							11,200,000
Common shares issued, price per share	$ 6.26									$ 100.00
Gross proceed from issuance of common shares	$ 26,300,000		$ 24,591,000