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Preferred Stock - Additional Information (Detail) - $ / shares
 6 Months Ended
Jun. 30, 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  
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 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%  
Purchase Agreement [Member]    
Class of Stock [Line Items]    
Cumulative dividends percentage until May 14, 2014 5.00%  
Cumulative dividend thereafter 9.00%