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Securities Financing Including Redeemable Preferred Stocks- Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 04, 2015
Dec. 31, 2015
Dec. 31, 2014
Class Of Stock [Line Items]      
Common stock issued   27,131,724 26,968,212
Common stock, par value   $ 0.10  
Estimated fair value of warrant   $ 22,300,000  
Number of common shares into which warrants may be converted   4,103,746  
Warrants, last exercisable date   Dec. 04, 2025  
Liquidated damages percentage   0.25%  
Additional liquidated damages percentage   0.25%  
Maximum increase of liquidated damages   1.00%  
Aggregate liquidated damages percentage   3.00%  
Series E Redeemable Preferred Stock [Member]      
Class Of Stock [Line Items]      
Estimated fair value of preferred stock   $ 187,700,000  
Preferred stock cumulative dividend rate   14.00%  
Participating right in dividends and liquidating distributions expressed in number of common shares   456,225  
Participating right in dividends and liquidating distributions expressed as a percentage of common shares   2.00%  
Minimum percentage of stock holding required   10.00%  
Liquidation preference per share   $ 1,000  
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 cumulative dividend rate   12.00% 12.00%
Series D Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock cumulative dividend rate   6.00% 6.00%
Series F Redeemable Preferred Stock [Member]      
Class Of Stock [Line Items]      
Common stock voting rights shares   4,559,971  
Percentage of common stock voting rights   19.99%  
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 is entitled to a number of votes equal to 4,559,971 shares of our common stock, which is equal to 19.99% of the number of outstanding shares of our common stock before the completion of the Private Placement; provided however, the number of votes that may be cast by the Series F Redeemable Preferred will be reduced automatically upon the occurrence of the following specified events:  upon any exercise of the Warrants, the Series F Voting Rights shall be reduced by a number of votes equal to the number of shares of our common stock into which the Warrants are exercised,  upon the redemption or exchange of each share of Series E for our common stock, the Series F Voting Rights shall be reduced by a number of shares of common stock equal to the amount specified in clauses (i) and (ii) of Participation Rights Value as specified in the Series E COD, and  upon (A) expiration of the exercise period set forth in the Warrants or exercise in full of the Warrants and (B) redemption or exchange in full of all shares of Series E Redeemable Preferred for our common stock, cash or otherwise, the Series F Voting Rights shall be reduced to zero.  
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  
Private Placement [Member]      
Class Of Stock [Line Items]      
Percentage of common shares into which warrants may be converted 17.99%    
Renewed rights agreement Dec. 04, 2008    
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