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Preferred Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
 [1]
Nov. 06, 2015
Class of Stock [Line Items]      
Preferred stock, shares outstanding 0 0  
Preferred stock, shares issued 0 0  
Par value $ 1.25 $ 1.25  
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 outstanding     13,900
Preferred Stock, redemption amount     $ 13,900
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]      
Preferred stock, shares outstanding     695
Preferred Stock, redemption amount     $ 695
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%    
[1] Derived from audited consolidated financial statements.