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Preferred Stock - Additional Information (Detail) (USD $)
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Class of Stock [Line Items]    
Number of shares 14,595 14,595
Liquidation preference $ 1,000 $ 1,000
Exercise price 4.00  
Discount on preferred stock amortized period 5 years  
Purchase Agreement [Member]
    
Class of Stock [Line Items]    
Cumulative dividends percentage until March 13, 2014 5.00%  
Cumulative dividend thereafter 9.00%  
Fixed Rate Cumulative Perpetual Preferred Stock, Series B [Member]
    
Class of Stock [Line Items]    
Liquidation preference $ 1,000  
Number of shares 695  
Exercise price 1.25  
Cumulative dividends of warrant preferred stock 9.00%  
Fixed Rate Cumulative Perpetual Preferred Stock, Series A [Member]
    
Class of Stock [Line Items]    
Number of shares 13,900  
Par value $ 1.25  
Liquidation preference $ 1,000