Preferred Stock - Additional Information (Detail) (USD $)	1 Months Ended								1 Months Ended									1 Months Ended	12 Months Ended				12 Months Ended					12 Months Ended
	Mar. 31, 1998	Dec. 31, 2012	Nov. 30, 2012	Jan. 12, 2012	Jan. 04, 2012	Sep. 30, 2006	Dec. 31, 1996	Dec. 31, 2012 Board of Directors	Dec. 31, 1996 Series A Preferred Stock	Dec. 31, 2012 Series A Preferred Stock	Sep. 30, 2012 Series A Preferred Stock	Jun. 30, 2012 Series A Preferred Stock	Dec. 31, 2011 Series A Preferred Stock	Mar. 31, 2006 Series A Preferred Stock	May 31, 1996 Series A Preferred Stock	Mar. 31, 1996 Series A Preferred Stock	Feb. 29, 1996 Series A Preferred Stock	Sep. 30, 2006 Series B Preferred Stock	Dec. 31, 2012 Series B Preferred Stock	Sep. 30, 2012 Series B Preferred Stock	Jun. 30, 2012 Series B Preferred Stock	Dec. 31, 2011 Series B Preferred Stock	Dec. 31, 2012 Series G Preferred Stock	Sep. 30, 2012 Series G Preferred Stock	Jun. 30, 2012 Series G Preferred Stock	Dec. 31, 2011 Series G Preferred Stock	Apr. 04, 2006 Series G Preferred Stock	Dec. 31, 2012 Series S Preferred Stock	Dec. 31, 2011 Series S Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized					20,000,000			20,000,000		7,900,000	7,900,000	7,900,000	7,900,000					9,000,000	9,000,000	9,000,000	9,000,000	9,000,000	3,000,000	3,000,000	3,000,000	3,000,000	3,000,000	10,000
Preferred stock, par value					$ 1.00					$ 1.00	$ 1.00	$ 1.00	$ 1.00		$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00		$ 1.00
Warrant exercise price per share		0.01	0.01	0.01			2.00
Preferred stock, dividend rate, percentage									8.00%
Preferred stock, redemption price per share						$ 1.00								$ 1.46									$ 5
Preferred stock, redemption terms	Redemption requires at least 30 days advanced notice and notice may only be given if the Company's common stock has closed above $2.00 per share for the twenty consecutive trading days prior to the notice.
Preferred stock, shares outstanding										440,932			457,599						3,056,487			7,828,822	0			19,200		100,000	100,000
Convertible preferred stock, terms of conversion																			Each share of Series B Preferred Stock $1.00 par value is convertible into 100 shares of the Company's Common Stock.				Convertible into 100 shares of common stock.					Convertible into 10,000 shares of the Company's Common Stock.
Preferred stock, voting rights																		100 votes per share.	100 votes per share.									10,000 votes per share.