Capital Stock (Preferred Shares Authorized, Issued And Outstanding) (Detail) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Series A Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Shares authorized, $0.01 par value	20,000,000	20,000,000
Preferred stock ,Par value	$ 0.01	$ 0.01
Shares issued and outstanding
Series B Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Shares authorized, $0.01 par value	150,000,000	150,000,000
Preferred stock ,Par value	$ 0.01	$ 0.01
Shares issued and outstanding	3,417,258	38,328,737
Series C Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Shares authorized, $0.01 par value	6,000,000	6,000,000
Preferred stock ,Par value	$ 0.01	$ 0.01
Shares issued and outstanding	1,517,237	1,517,237
Series D Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Shares authorized, $0.01 par value	20,000,000	20,000,000
Preferred stock ,Par value	$ 0.01	$ 0.01
Shares issued and outstanding