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Preferred Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2015
Nov. 06, 2015
Dec. 31, 2014
Class of Stock [Line Items]      
Preferred stock, shares issued 14,595   14,595
Preferred stock, liquidation preference $ 1,000   $ 1,000
Discount on preferred stock amortized period 5 years    
Preferred stock, shares outstanding 14,595   14,595
Fixed Rate Cumulative Perpetual Preferred Stock, Series A [Member]      
Class of Stock [Line Items]      
Preferred stock, shares issued 13,900    
Par value $ 1.25    
Preferred stock, liquidation preference 1,000    
Fixed Rate Cumulative Perpetual Preferred Stock, Series A [Member] | Subsequent Event [Member]      
Class of Stock [Line Items]      
Preferred stock, shares outstanding   13,900  
Preferred Stock, redemption amount   $ 13,900  
Fixed Rate Cumulative Perpetual Preferred Stock, Series B [Member]      
Class of Stock [Line Items]      
Par value 1.25    
Preferred stock, liquidation preference $ 1,000    
Number of shares 695    
Cumulative dividends of warrant preferred stock 9.00%    
Fixed Rate Cumulative Perpetual Preferred Stock, Series B [Member] | Subsequent Event [Member]      
Class of Stock [Line Items]      
Preferred stock, shares outstanding   695  
Preferred Stock, redemption amount   $ 695  
Purchase Agreement [Member]      
Class of Stock [Line Items]      
Cumulative dividends percentage until May 14, 2014 5.00%    
Cumulative dividend thereafter 9.00%