Summary of Preferred Stock (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred stock, shares issued	373,355	373,355
Preferred stock, shares outstanding	373,355	373,355
Preferred Stock Dividends Undeclared and Unpaid	$ 266,000	$ 266,000
Series A Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	590,197	590,197
Preferred stock, shares issued	47,250	47,250
Preferred stock, shares outstanding	47,250	47,250
Preferred Stock Dividends Undeclared and Unpaid	0	0
Series B Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	1,500,000	1,500,000
Preferred stock, shares issued	93,750	93,750
Preferred stock, shares outstanding	93,750	93,750
Preferred Stock Dividends Undeclared and Unpaid	37,500	37,500
Series C Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	1,666,666	1,666,666
Preferred stock, shares issued	38,333	38,333
Preferred stock, shares outstanding	38,333	38,333
Preferred Stock Dividends Undeclared and Unpaid	11,500	11,500
Series D Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	300,000	300,000
Preferred stock, shares issued	175,000	175,000
Preferred stock, shares outstanding	175,000	175,000
Preferred Stock Dividends Undeclared and Unpaid	175,000	175,000
Series E Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	800,000	800,000
Preferred stock, shares issued	19,022	19,022
Preferred stock, shares outstanding	19,022	19,022
Preferred Stock Dividends Undeclared and Unpaid	42,000	42,000
Undesignated Preferred Series [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	5,143,137	5,143,137
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Preferred Stock Dividends Undeclared and Unpaid	$ 0	$ 0