Series D Preferred Shares - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended
	May 03, 2013	Sep. 30, 2012	Jun. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Temporary Equity [Line Items]
Maximum period to issue and sell securities on private placement basis		2 years
Aggregate purchase price under Securities Purchase Agreement			$ 65,000
Stock Appreciation Rights		6,735,667.00	4,378,183.55	6,735,667.00
Stock Appreciation Rights Exercise Price	$ 5.90			$ 6.00
Fair value of Warrants and stock appreciation rights			16,095
Preferred shares total issued			2,600,000		2,600,000
Warrants exercisable for common shares			6,455,150
Aggregate purchase price of securities to be issued			35,000
Preferred shares to be sold			1,400,000
Warrants to be issued exercisable for common shares			3,475,850
Stock Appreciation Rights to be issued			2,357,483.45
Adjusted
Temporary Equity [Line Items]
Stock Appreciation Rights			4,449,521.89
Warrants exercisable for common shares			6,560,331
Warrants to be issued exercisable for common shares			3,532,486
Stock Appreciation Rights to be issued			2,395,896.40
ARS VI
Temporary Equity [Line Items]
Aggregate purchase price under Securities Purchase Agreement		$ 100,000		$ 100,000
Series D Preferred Stock
Temporary Equity [Line Items]
Preferred shares with warrants		9,931,000		9,931,000
Stock Appreciation Rights Exercise Price	$ 5.90			$ 6.00
Series D Preferred Stock | ARS VI
Temporary Equity [Line Items]
Preferred shares total issued		4,000,000		4,000,000
Cumulative Redeemable Preferred Shares, par value		$ 0.01		$ 0.01