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Non-Redeemable Preferred Stock - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Preferred Stock [Line Items]      
Cash dividends paid on non-redeemable preferred stock $ 300,000 $ 300,000 $ 300,000
Series B Preferred Stock [Member]      
Preferred Stock [Line Items]      
Preferred stock, shares outstanding 20,000 20,000  
Number of cumulative convertible preferred stock 20,000 20,000  
Preferred stock cumulative dividend rate 12.00% 12.00%  
Preferred stock, par value $ 100 $ 100  
Number of shares of common stock for each share of converted preferred stock 33.3333 shares of common stock for each share of preferred stock    
Preferred stock converted into shares of common stock 666,666    
Votes per share for preferred share holder One vote per share    
Cash dividends paid on non-redeemable preferred stock $ 240,000 $ 240,000 240,000
Cash dividends paid on non-redeemable preferred stock per share $ 12.00    
Shares of authorized additional preferred stock 230,000    
Series D Preferred Stock [Member]      
Preferred Stock [Line Items]      
Preferred stock, shares outstanding 1,000,000 1,000,000  
Number of cumulative convertible preferred stock 1,000,000 1,000,000  
Preferred stock cumulative dividend rate 6.00% 6.00%  
Number of shares of common stock for each share of converted preferred stock 1 share of common stock for 4 shares of preferred stock    
Preferred stock converted into shares of common stock 250,000    
Votes per share for preferred share holder .875 votes per share    
Preferred stock no par value $ 0 $ 0  
Liquidation preference of Series D preferred stock $ 1.00    
Cash dividends paid on non-redeemable preferred stock $ 60,000 $ 60,000 $ 60,000
Cash dividends paid on non-redeemable preferred stock per share $ 0.06    
Shares of authorized additional preferred stock 3,790,000    
Cumulative Preferred Stock [Member]      
Preferred Stock [Line Items]      
Preferred stock dividends accumulated $ 78,000