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Stockholders' Equity - Summary of Authorized Outstanding Preferred and Common Stock (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Class of Stock [Line Items]      
Common stock, shares authorized 20,000,000 20,000,000  
Common stock, shares outstanding 15,333,622 15,242,308 15,117,430
Common stock, par value $ 1.00 $ 1.00  
Common stock dividend payment terms As declared    
Common stock, voting rights Voting    
Senior preferred stock [Member]
      
Class of Stock [Line Items]      
Preferred stock, shares authorized 10,000,000 10,000,000  
Preferred stock, shares outstanding         
Preferred stock, par value $ 1.00 $ 1.00  
Preferred stock, dividend payment terms As declared    
Preferred stock, voting rights Voting    
Cumulative preferred stock [Member]
      
Class of Stock [Line Items]      
Preferred stock, shares authorized 900,000 900,000  
Preferred stock, shares outstanding         
Preferred stock, par value $ 5.00 $ 5.00  
Preferred stock, dividend payment terms As declared    
Preferred stock, voting rights Non-voting