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Securities Financing Including Redeemable Preferred Stocks - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class Of Stock [Line Items]        
Common stock issued 31,283,210 31,280,685    
Rights agreement expiration period 2018-12      
Series E Redeemable Preferred Stock [Member]        
Class Of Stock [Line Items]        
Liquidation preference per share $ 1,000      
Redeemable preferred stock, redemption term The letter agreement also provided for the amendment of certain other terms relating to the Series E Redeemable Preferred, including an increase in the per annum dividend rate payable in respect of the Series E Redeemable Preferred (a) by 0.50% on the third anniversary of the Financing Transaction, (b) by an additional 0.50% on the fourth anniversary of the Financing Transaction and (c) by an additional 1.0% on the fifth anniversary of the Financing Transaction.      
Preferred stock, shares authorized 139,768      
Preferred stock cumulative dividend rate 14.00%      
Participating right in dividends and liquidating distributions expressed in number of common shares 303,646      
Minimum percentage of stock holding required 10.00%      
Series E Redeemable Preferred Stock [Member] | Third Anniversary of Financing Transactions [Member]        
Class Of Stock [Line Items]        
Increase in dividends payable percentage 0.50%      
Series E Redeemable Preferred Stock [Member] | Fourth Anniversary of Financing Transactions [Member]        
Class Of Stock [Line Items]        
Additional increase in dividends payable percentage 0.50%      
Series E Redeemable Preferred Stock [Member] | Fifth Anniversary of Financing Transactions [Member]        
Class Of Stock [Line Items]        
Additional increase in dividends payable percentage 1.00%      
Series E Redeemable Preferred Stock [Member] | Climate Control Group [Member]        
Class Of Stock [Line Items]        
Redemption of preferred stock, shares     70,232  
Redemption of preferred stock     $ 80,000,000  
Preferred Stock, Liquidation Preference, Value     $ 78,300,000  
Liquidation preference per share     $ 1,000  
Redeemable preferred stock, liquidation preference     $ 1,700,000  
Preferred stock, shares outstanding 139,768      
Series B Preferred Stock [Member]        
Class Of Stock [Line Items]        
Preferred Stock, Liquidation Preference, Value $ 2,785,000 $ 2,545,000    
Preferred stock, shares outstanding 20,000 20,000    
Preferred stock cumulative dividend rate 12.00% 12.00%    
Series D Preferred Stock [Member]        
Class Of Stock [Line Items]        
Preferred Stock, Liquidation Preference, Value $ 1,192,000 $ 1,132,000    
Preferred stock, shares outstanding 1,000,000 1,000,000    
Preferred stock cumulative dividend rate 6.00% 6.00%    
Series F Redeemable Preferred Stock [Member]        
Class Of Stock [Line Items]        
Voting rights description The Series F COD authorizes one (1) shares of Series F Redeemable Preferred. The Series F Redeemable Preferred had voting rights (the “Series F Voting Rights”) to vote as a single class on all matters which the common stock have the right to vote and was entitled to a number of votes equal to 4,559,971 shares of our common stock, but, the number of votes that may be cast by the Series F Redeemable Preferred was reduced automatically to 456,225 shares of common stock upon the exercise of the warrants during 2016 as discussed below.      
Series F Redeemable Preferred Stock [Member] | Upon Liquidation Event [Member]        
Class Of Stock [Line Items]        
Liquidation preference per share $ 100      
Preferred stock redemption price per share $ 0.01      
Series F Redeemable Preferred Stock [Member] | Maximum [Member]        
Class Of Stock [Line Items]        
Common stock voting rights shares 4,559,971      
Series F Redeemable Preferred Stock [Member] | Minimum [Member]        
Class Of Stock [Line Items]        
Common stock voting rights shares 456,225      
Series E and Series F Redeemable Preferred Stock [Member]        
Class Of Stock [Line Items]        
Common stock, par value $ 0.10      
Number of common shares into which warrants may be converted 4,103,746      
Warrants exercised period 2016      
Common stock issued, cashless exercise of warrants 4,103,746      
Shares surrendered by holder in payment of exercise price 34,422      
Private Placement [Member]        
Class Of Stock [Line Items]        
Renewed rights agreement 2019-01      
Private Placement [Member] | Warrants to Purchase [Member]        
Class Of Stock [Line Items]        
Common stock issued       4,103,746
Common stock, par value       $ 0.10
Private Placement [Member] | Series E Redeemable Preferred Stock [Member]        
Class Of Stock [Line Items]        
Value of shares under purchase agreement       $ 210,000,000