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Securities Financing Including Redeemable Preferred Stocks - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Sep. 19, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Class Of Stock [Line Items]        
Common stock issued   27,131,724 31,280,685 27,131,724
Series E Redeemable Preferred Stock [Member]        
Class Of Stock [Line Items]        
Redemption of preferred stock, shares     (70,232)  
Redemption of preferred stock     $ (70,232,000)  
Liquidation preference per share     $ 1,000  
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] | Climate Control Group [Member]        
Class Of Stock [Line Items]        
Redemption of preferred stock, shares 70,232      
Redemption of preferred stock $ 80,000,000      
Redeemable preferred stock, liquidation preference $ 1,700,000      
Liquidation preference per share $ 1,000      
Preferred Stock, Liquidation Preference, Value $ 78,300,000      
Preferred stock, shares outstanding 139,768      
Series E Redeemable Preferred Stock [Member] | Certificate of Designations [Member]        
Class Of Stock [Line Items]        
Preferred shares authorized     210,000  
Series B Preferred Stock [Member]        
Class Of Stock [Line Items]        
Preferred stock, shares outstanding   20,000 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, shares outstanding   1,000,000 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 has 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 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     2016-05  
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   Dec. 04, 2008    
Private Placement [Member] | Warrants to Purchase [Member]        
Class Of Stock [Line Items]        
Common stock issued   4,103,746   4,103,746
Common stock, par value   $ 0.10   $ 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   $ 210,000,000