Preferred Stock - Additional Information (Detail) (USD $)	0 Months Ended
	Feb. 08, 2012	Feb. 29, 2012
Class of Stock [Line Items]
Treasury stock amount paid	$ 19,200,000
Treasury stock amount paid, principal amount	19,000,000
Treasury stock amount paid, accrued and unpaid dividends	219,000
Accretion of preferred stock discount	501,000
Shares of common stock for which warrant previously issued for treasury		1,046,901
Repurchase price of common stock		2,800,000
Common stock warrant carrying value		$ 3,300,000
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Fixed Rate Cumulative Preferred Stock redemption	19,000
Treasury Stock [Member]
Class of Stock [Line Items]
Treasury stock, per share value		$ 8.45