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Stockholders' Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 24, 2017
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 06, 2016
Stockholders Equity [Line Items]            
Common stock, shares authorized   75,000,000 75,000,000 75,000,000    
Common stock, par value   $ 0.50 $ 0.50 $ 0.50    
Preferred stock, shares authorized   5,000,000 5,000,000 5,000,000    
Preferred stock, par value per share   $ 10.00 $ 10.00 $ 10.00    
Preferred stock, shares outstanding   0 0 0    
Dividend paid         $ 23,800,000  
Stock purchased under open market amount     $ 0 $ 0 $ 8,086,000  
Debt conversion, convertible instrument, principal amount   $ 2,100,000        
Warrants issued to acquire common stock           1,917,342
Exercise price of warrants for common stock   $ 0.01 $ 0.01     $ 0.01
Warrants exercised     1,255,462      
Warrants outstanding   661,880 661,880      
Subsequent Event            
Stockholders Equity [Line Items]            
Debt conversion, convertible instrument, principal amount $ 9,200,000          
Common Stock            
Stockholders Equity [Line Items]            
Number of stock purchased under open market         200,000  
Debt conversion, converted instrument, shares of common stock issued   176,175        
Warrants exercised     1,256,000      
Common Stock | Subsequent Event            
Stockholders Equity [Line Items]            
Debt conversion, converted instrument, shares of common stock issued 767,353